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Code Issues 288 Code Review (Gerrit) Projects 1 Releases Wiki Activity

Merge remote-tracking branch 'upstream/master' into path-info

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John Ericson 2023-01-06 10:35:20 -05:00
parent 55caef36ed 3172c51baf
commit e9fc1e4fdb
404 changed files with 14903 additions and 6731 deletions
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15
.github/CODEOWNERS vendored Normal file
View file

@ -0,0 +1,15 @@
# Pull requests concerning the listed files will automatically invite the respective maintainers as reviewers.
# This file is not used for denoting any kind of ownership, but is merely a tool for handling notifications.
#
# Merge permissions are required for maintaining an entry in this file.
# For documentation on this mechanism, see https://help.github.com/articles/about-codeowners/
# Default reviewers if nothing else matches
* @edolstra @thufschmitt
# This file
.github/CODEOWNERS @edolstra
# Public documentation
/doc @fricklerhandwerk
*.md @fricklerhandwerk

4
.github/ISSUE_TEMPLATE/bug_report.md vendored
View file

@ -30,3 +30,7 @@ A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
**Priorities**
Add :+1: to [issues you find important](https://github.com/NixOS/nix/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc).

6
.github/ISSUE_TEMPLATE/feature_request.md vendored
View file

@ -2,7 +2,7 @@
name: Feature request
about: Suggest an idea for this project
title: ''
labels: improvement
labels: feature
assignees: ''
---
@ -18,3 +18,7 @@ A clear and concise description of any alternative solutions or features you've
**Additional context**
Add any other context or screenshots about the feature request here.
**Priorities**
Add :+1: to [issues you find important](https://github.com/NixOS/nix/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc).

36
.github/ISSUE_TEMPLATE/installer.md vendored Normal file
View file

@ -0,0 +1,36 @@
---
name: Installer issue
about: Report problems with installation
title: ''
labels: installer
assignees: ''
---
## Platform
<!-- select the platform on which you tried to install Nix -->
- [ ] Linux: <!-- state your distribution, e.g. Arch Linux, Ubuntu, ... -->
- [ ] macOS
- [ ] WSL
## Additional information
<!-- state special circumstances on your system or additional steps you have taken prior to installation -->
## Output
<details><summary>Output</summary>
```log
<!-- paste console output here and remove this comment -->
```
</details>
## Priorities
Add :+1: to [issues you find important](https://github.com/NixOS/nix/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc).

31
.github/ISSUE_TEMPLATE/missing_documentation.md vendored Normal file
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@ -0,0 +1,31 @@
---
name: Missing or incorrect documentation
about: Help us improve the reference manual
title: ''
labels: documentation
assignees: ''
---
## Problem
<!-- describe your problem -->
## Checklist
<!-- make sure this issue is not redundant or obsolete -->
- [ ] checked [latest Nix manual] \([source])
- [ ] checked [open documentation issues and pull requests] for possible duplicates
[latest Nix manual]: https://nixos.org/manual/nix/unstable/
[source]: https://github.com/NixOS/nix/tree/master/doc/manual/src
[open documentation issues and pull requests]: https://github.com/NixOS/nix/labels/documentation
## Proposal
<!-- propose a solution -->
## Priorities
Add :+1: to [issues you find important](https://github.com/NixOS/nix/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc).

4
.github/PULL_REQUEST_TEMPLATE/pull_request_template.md vendored
View file

@ -5,3 +5,7 @@ Please include relevant [release notes](https://github.com/NixOS/nix/blob/master
**Testing**
If this issue is a regression or something that should block release, please consider including a test either in the [testsuite](https://github.com/NixOS/nix/tree/master/tests) or as a [hydraJob]( https://github.com/NixOS/nix/blob/master/flake.nix#L396) so that it can be part of the [automatic checks](https://hydra.nixos.org/jobset/nix/master).
**Priorities**
Add :+1: to [pull requests you find important](https://github.com/NixOS/nix/pulls?q=is%3Aopen+sort%3Areactions-%2B1-desc).

9
.github/stale.yml vendored
View file

@ -1,10 +1,9 @@
# Configuration for probot-stale - https://github.com/probot/stale
daysUntilStale: 180
daysUntilClose: 365
daysUntilClose: false
exemptLabels:
- "critical"
- "never-stale"
staleLabel: "stale"
markComment: |
I marked this as stale due to inactivity. &rarr; [More info](https://github.com/NixOS/nix/blob/master/.github/STALE-BOT.md)
closeComment: |
I closed this issue due to inactivity. &rarr; [More info](https://github.com/NixOS/nix/blob/master/.github/STALE-BOT.md)
markComment: false
closeComment: false

8
.github/workflows/backport.yml vendored
View file

@ -2,9 +2,15 @@ name: Backport
on:
pull_request_target:
types: [closed, labeled]
permissions:
contents: read
jobs:
backport:
name: Backport Pull Request
permissions:
# for zeebe-io/backport-action
contents: write
pull-requests: write
if: github.repository_owner == 'NixOS' && github.event.pull_request.merged == true && (github.event_name != 'labeled' || startsWith('backport', github.event.label.name))
runs-on: ubuntu-latest
steps:
@ -15,7 +21,7 @@ jobs:
fetch-depth: 0
- name: Create backport PRs
# should be kept in sync with `version`
uses: zeebe-io/backport-action@v0.0.7
uses: zeebe-io/backport-action@v1.0.1
with:
# Config README: https://github.com/zeebe-io/backport-action#backport-action
github_token: ${{ secrets.GITHUB_TOKEN }}

64
.github/workflows/ci.yml vendored
View file

@ -4,10 +4,12 @@ on:
pull_request:
push:
permissions: read-all
jobs:
tests:
needs: [check_cachix]
needs: [check_secrets]
strategy:
matrix:
os: [ubuntu-latest, macos-latest]
@ -17,31 +19,37 @@ jobs:
- uses: actions/checkout@v3
with:
fetch-depth: 0
- uses: cachix/install-nix-action@v17
- uses: cachix/install-nix-action@v18
- run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
- uses: cachix/cachix-action@v10
if: needs.check_cachix.outputs.secret == 'true'
- uses: cachix/cachix-action@v12
if: needs.check_secrets.outputs.cachix == 'true'
with:
name: '${{ env.CACHIX_NAME }}'
signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
- run: nix --experimental-features 'nix-command flakes' flake check -L
check_cachix:
name: Cachix secret present for installer tests
check_secrets:
permissions:
contents: none
name: Check Cachix and Docker secrets present for installer tests
runs-on: ubuntu-latest
outputs:
secret: ${{ steps.secret.outputs.secret }}
cachix: ${{ steps.secret.outputs.cachix }}
docker: ${{ steps.secret.outputs.docker }}
steps:
- name: Check for Cachix secret
- name: Check for secrets
id: secret
env:
_CACHIX_SECRETS: ${{ secrets.CACHIX_SIGNING_KEY }}${{ secrets.CACHIX_AUTH_TOKEN }}
run: echo "::set-output name=secret::${{ env._CACHIX_SECRETS != '' }}"
_DOCKER_SECRETS: ${{ secrets.DOCKERHUB_USERNAME }}${{ secrets.DOCKERHUB_TOKEN }}
run: |
echo "::set-output name=cachix::${{ env._CACHIX_SECRETS != '' }}"
echo "::set-output name=docker::${{ env._DOCKER_SECRETS != '' }}"
installer:
needs: [tests, check_cachix]
if: github.event_name == 'push' && needs.check_cachix.outputs.secret == 'true'
needs: [tests, check_secrets]
if: github.event_name == 'push' && needs.check_secrets.outputs.cachix == 'true'
runs-on: ubuntu-latest
outputs:
installerURL: ${{ steps.prepare-installer.outputs.installerURL }}
@ -50,8 +58,8 @@ jobs:
with:
fetch-depth: 0
- run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
- uses: cachix/install-nix-action@v17
- uses: cachix/cachix-action@v10
- uses: cachix/install-nix-action@v18
- uses: cachix/cachix-action@v12
with:
name: '${{ env.CACHIX_NAME }}'
signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
@ -60,8 +68,8 @@ jobs:
run: scripts/prepare-installer-for-github-actions
installer_test:
needs: [installer, check_cachix]
if: github.event_name == 'push' && needs.check_cachix.outputs.secret == 'true'
needs: [installer, check_secrets]
if: github.event_name == 'push' && needs.check_secrets.outputs.cachix == 'true'
strategy:
matrix:
os: [ubuntu-latest, macos-latest]
@ -69,28 +77,36 @@ jobs:
steps:
- uses: actions/checkout@v3
- run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
- uses: cachix/install-nix-action@v17
- uses: cachix/install-nix-action@v18
with:
install_url: '${{needs.installer.outputs.installerURL}}'
install_options: "--tarball-url-prefix https://${{ env.CACHIX_NAME }}.cachix.org/serve"
- run: nix-instantiate -E 'builtins.currentTime' --eval
- run: sudo apt install fish zsh
if: matrix.os == 'ubuntu-latest'
- run: brew install fish
if: matrix.os == 'macos-latest'
- run: exec bash -c "nix-instantiate -E 'builtins.currentTime' --eval"
- run: exec sh -c "nix-instantiate -E 'builtins.currentTime' --eval"
- run: exec zsh -c "nix-instantiate -E 'builtins.currentTime' --eval"
- run: exec fish -c "nix-instantiate -E 'builtins.currentTime' --eval"
docker_push_image:
needs: [check_cachix, tests]
needs: [check_secrets, tests]
if: >-
github.event_name == 'push' &&
github.ref_name == 'master' &&
needs.check_cachix.outputs.secret == 'true'
needs.check_secrets.outputs.cachix == 'true' &&
needs.check_secrets.outputs.docker == 'true'
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
with:
fetch-depth: 0
- uses: cachix/install-nix-action@v17
- uses: cachix/install-nix-action@v18
- run: echo CACHIX_NAME="$(echo $GITHUB_REPOSITORY-install-tests | tr "[A-Z]/" "[a-z]-")" >> $GITHUB_ENV
- run: echo NIX_VERSION="$(nix-instantiate --eval -E '(import ./default.nix).defaultPackage.${builtins.currentSystem}.version' | tr -d \")" >> $GITHUB_ENV
- uses: cachix/cachix-action@v10
if: needs.check_cachix.outputs.secret == 'true'
- run: echo NIX_VERSION="$(nix --experimental-features 'nix-command flakes' eval .\#default.version | tr -d \")" >> $GITHUB_ENV
- uses: cachix/cachix-action@v12
if: needs.check_secrets.outputs.cachix == 'true'
with:
name: '${{ env.CACHIX_NAME }}'
signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
@ -100,7 +116,7 @@ jobs:
- run: docker tag nix:$NIX_VERSION nixos/nix:$NIX_VERSION
- run: docker tag nix:$NIX_VERSION nixos/nix:master
- name: Login to Docker Hub
uses: docker/login-action@v1
uses: docker/login-action@v2
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}

4
.github/workflows/hydra_status.yml vendored
View file

@ -1,8 +1,12 @@
name: Hydra status
permissions: read-all
on:
schedule:
- cron: "12,42 * * * *"
workflow_dispatch:
jobs:
check_hydra_status:
name: Check Hydra status

6
.gitignore vendored
View file

@ -22,11 +22,13 @@ perl/Makefile.config
/doc/manual/src/SUMMARY.md
/doc/manual/src/command-ref/new-cli
/doc/manual/src/command-ref/conf-file.md
/doc/manual/src/expressions/builtins.md
/doc/manual/src/language/builtins.md
# /scripts/
/scripts/nix-profile.sh
/scripts/nix-profile-daemon.sh
/scripts/nix-profile.fish
/scripts/nix-profile-daemon.fish
# /src/libexpr/
/src/libexpr/lexer-tab.cc
@ -35,6 +37,7 @@ perl/Makefile.config
/src/libexpr/parser-tab.hh
/src/libexpr/parser-tab.output
/src/libexpr/nix.tbl
/src/libexpr/tests/libexpr-tests
# /src/libstore/
*.gen.*
@ -79,6 +82,7 @@ perl/Makefile.config
/tests/shell.drv
/tests/config.nix
/tests/ca/config.nix
/tests/repl-result-out
# /tests/lang/
/tests/lang/*.out

2
.version
View file

@ -1 +1 @@
2.9.0
2.13.0

4
Makefile
View file

@ -8,6 +8,7 @@ makefiles = \
src/libfetchers/local.mk \
src/libmain/local.mk \
src/libexpr/local.mk \
src/libexpr/tests/local.mk \
src/libcmd/local.mk \
src/nix/local.mk \
src/resolve-system-dependencies/local.mk \
@ -27,7 +28,8 @@ makefiles = \
OPTIMIZE = 1
ifeq ($(OPTIMIZE), 1)
GLOBAL_CXXFLAGS += -O3
GLOBAL_CXXFLAGS += -O3 $(CXXLTO)
GLOBAL_LDFLAGS += $(CXXLTO)
else
GLOBAL_CXXFLAGS += -O0 -U_FORTIFY_SOURCE
endif

6
Makefile.config.in
View file

@ -1,4 +1,3 @@
HOST_OS = @host_os@
AR = @AR@
BDW_GC_LIBS = @BDW_GC_LIBS@
BOOST_LDFLAGS = @BOOST_LDFLAGS@
@ -7,18 +6,20 @@ CC = @CC@
CFLAGS = @CFLAGS@
CXX = @CXX@
CXXFLAGS = @CXXFLAGS@
CXXLTO = @CXXLTO@
EDITLINE_LIBS = @EDITLINE_LIBS@
ENABLE_S3 = @ENABLE_S3@
GTEST_LIBS = @GTEST_LIBS@
HAVE_LIBCPUID = @HAVE_LIBCPUID@
HAVE_SECCOMP = @HAVE_SECCOMP@
HOST_OS = @host_os@
LDFLAGS = @LDFLAGS@
LIBARCHIVE_LIBS = @LIBARCHIVE_LIBS@
LIBBROTLI_LIBS = @LIBBROTLI_LIBS@
LIBCURL_LIBS = @LIBCURL_LIBS@
LIBSECCOMP_LIBS = @LIBSECCOMP_LIBS@
LOWDOWN_LIBS = @LOWDOWN_LIBS@
OPENSSL_LIBS = @OPENSSL_LIBS@
LIBSECCOMP_LIBS = @LIBSECCOMP_LIBS@
PACKAGE_NAME = @PACKAGE_NAME@
PACKAGE_VERSION = @PACKAGE_VERSION@
SHELL = @bash@
@ -30,6 +31,7 @@ datadir = @datadir@
datarootdir = @datarootdir@
doc_generate = @doc_generate@
docdir = @docdir@
embedded_sandbox_shell = @embedded_sandbox_shell@
exec_prefix = @exec_prefix@
includedir = @includedir@
libdir = @libdir@

2
README.md
View file

@ -20,7 +20,7 @@ Information on additional installation methods is available on the [Nix download
## Building And Developing
See our [Hacking guide](https://hydra.nixos.org/job/nix/master/build.x86_64-linux/latest/download-by-type/doc/manual/contributing/hacking.html) in our manual for instruction on how to
See our [Hacking guide](https://nixos.org/manual/nix/stable/contributing/hacking.html) in our manual for instruction on how to
build nix from source with nix-build or how to get a development environment.
## Additional Resources

45
boehmgc-coroutine-sp-fallback.diff
View file

@ -1,45 +0,0 @@
diff --git a/pthread_stop_world.c b/pthread_stop_world.c
index 4b2c429..1fb4c52 100644
--- a/pthread_stop_world.c
+++ b/pthread_stop_world.c
@@ -673,6 +673,8 @@ GC_INNER void GC_push_all_stacks(void)
struct GC_traced_stack_sect_s *traced_stack_sect;
pthread_t self = pthread_self();
word total_size = 0;
+ size_t stack_limit;
+ pthread_attr_t pattr;
if (!EXPECT(GC_thr_initialized, TRUE))
GC_thr_init();
@@ -722,6 +724,31 @@ GC_INNER void GC_push_all_stacks(void)
hi = p->altstack + p->altstack_size;
/* FIXME: Need to scan the normal stack too, but how ? */
/* FIXME: Assume stack grows down */
+ } else {
+ if (pthread_getattr_np(p->id, &pattr)) {
+ ABORT("GC_push_all_stacks: pthread_getattr_np failed!");
+ }
+ if (pthread_attr_getstacksize(&pattr, &stack_limit)) {
+ ABORT("GC_push_all_stacks: pthread_attr_getstacksize failed!");
+ }
+ if (pthread_attr_destroy(&pattr)) {
+ ABORT("GC_push_all_stacks: pthread_attr_destroy failed!");
+ }
+ // When a thread goes into a coroutine, we lose its original sp until
+ // control flow returns to the thread.
+ // While in the coroutine, the sp points outside the thread stack,
+ // so we can detect this and push the entire thread stack instead,
+ // as an approximation.
+ // We assume that the coroutine has similarly added its entire stack.
+ // This could be made accurate by cooperating with the application
+ // via new functions and/or callbacks.
+ #ifndef STACK_GROWS_UP
+ if (lo >= hi || lo < hi - stack_limit) { // sp outside stack
+ lo = hi - stack_limit;
+ }
+ #else
+ #error "STACK_GROWS_UP not supported in boost_coroutine2 (as of june 2021), so we don't support it in Nix."
+ #endif
}
GC_push_all_stack_sections(lo, hi, traced_stack_sect);
# ifdef STACK_GROWS_UP

46
configure.ac
View file

@ -41,8 +41,6 @@ AC_DEFINE_UNQUOTED(SYSTEM, ["$system"], [platform identifier ('cpu-os')])
test "$localstatedir" = '${prefix}/var' && localstatedir=/nix/var
CFLAGS=
CXXFLAGS=
AC_PROG_CC
AC_PROG_CXX
AC_PROG_CPP
@ -147,6 +145,20 @@ if test "x$GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC" = xyes; then
LDFLAGS="-latomic $LDFLAGS"
fi
# LTO is currently broken with clang for unknown reasons; ld segfaults in the llvm plugin
AC_ARG_ENABLE(lto, AS_HELP_STRING([--enable-lto],[Enable LTO (only supported with GCC) [default=no]]),
lto=$enableval, lto=no)
if test "$lto" = yes; then
if $CXX --version | grep -q GCC; then
AC_SUBST(CXXLTO, [-flto=jobserver])
else
echo "error: LTO is only supported with GCC at the moment" >&2
exit 1
fi
else
AC_SUBST(CXXLTO, [""])
fi
PKG_PROG_PKG_CONFIG
AC_ARG_ENABLE(shared, AS_HELP_STRING([--enable-shared],[Build shared libraries for Nix [default=yes]]),
@ -163,7 +175,7 @@ fi
PKG_CHECK_MODULES([OPENSSL], [libcrypto], [CXXFLAGS="$OPENSSL_CFLAGS $CXXFLAGS"])
# Checks for libarchive
# Look for libarchive.
PKG_CHECK_MODULES([LIBARCHIVE], [libarchive >= 3.1.2], [CXXFLAGS="$LIBARCHIVE_CFLAGS $CXXFLAGS"])
# Workaround until https://github.com/libarchive/libarchive/issues/1446 is fixed
if test "$shared" != yes; then
@ -282,18 +294,28 @@ AC_CHECK_FUNCS([setresuid setreuid lchown])
AC_CHECK_FUNCS([strsignal posix_fallocate sysconf])
# This is needed if bzip2 is a static library, and the Nix libraries
# are dynamic.
case "${host_os}" in
darwin*)
LDFLAGS="-all_load $LDFLAGS"
;;
esac
AC_ARG_WITH(sandbox-shell, AS_HELP_STRING([--with-sandbox-shell=PATH],[path of a statically-linked shell to use as /bin/sh in sandboxes]),
sandbox_shell=$withval)
AC_SUBST(sandbox_shell)
if test ${cross_compiling:-no} = no && ! test -z ${sandbox_shell+x}; then
AC_MSG_CHECKING([whether sandbox-shell has the standalone feature])
# busybox shell sometimes allows executing other busybox applets,
# even if they are not in the path, breaking our sandbox
if PATH= $sandbox_shell -c "busybox" 2>&1 | grep -qv "not found"; then
AC_MSG_RESULT(enabled)
AC_MSG_ERROR([Please disable busybox FEATURE_SH_STANDALONE])
else
AC_MSG_RESULT(disabled)
fi
fi
AC_ARG_ENABLE(embedded-sandbox-shell, AS_HELP_STRING([--enable-embedded-sandbox-shell],[include the sandbox shell in the Nix binary [default=no]]),
embedded_sandbox_shell=$enableval, embedded_sandbox_shell=no)
AC_SUBST(embedded_sandbox_shell)
if test "$embedded_sandbox_shell" = yes; then
AC_DEFINE(HAVE_EMBEDDED_SANDBOX_SHELL, 1, [Include the sandbox shell in the Nix binary.])
fi
# Expand all variables in config.status.
test "$prefix" = NONE && prefix=$ac_default_prefix

31
doc/manual/anchors.jq Executable file
View file

@ -0,0 +1,31 @@
"\\[\\]\\{#(?<anchor>[^\\}]+?)\\}" as $empty_anchor_regex |
"\\[(?<text>[^\\]]+?)\\]\\{#(?<anchor>[^\\}]+?)\\}" as $anchor_regex |
def transform_anchors_html:
. | gsub($empty_anchor_regex; "<a name=\"" + .anchor + "\"></a>")
| gsub($anchor_regex; "<a href=\"#" + .anchor + "\" id=\"" + .anchor + "\">" + .text + "</a>");
def transform_anchors_strip:
. | gsub($empty_anchor_regex; "")
| gsub($anchor_regex; .text);
def map_contents_recursively(transformer):
. + {
Chapter: (.Chapter + {
content: .Chapter.content | transformer,
sub_items: .Chapter.sub_items | map(map_contents_recursively(transformer)),
}),
};
def process_command:
.[0] as $context |
.[1] as $body |
$body + {
sections: $body.sections | map(map_contents_recursively(if $context.renderer == "html" then transform_anchors_html else transform_anchors_strip end)),
};
process_command

10
doc/manual/book.toml
View file

@ -1,2 +1,12 @@
[book]
title = "Nix Reference Manual"
[output.html]
additional-css = ["custom.css"]
additional-js = ["redirects.js"]
edit-url-template = "https://github.com/NixOS/nix/tree/master/doc/manual/{path}"
git-repository-url = "https://github.com/NixOS/nix"
[preprocessor.anchors]
renderers = ["html"]
command = "jq --from-file doc/manual/anchors.jq"

32
doc/manual/generate-builtins.nix
View file

@ -1,16 +1,20 @@
with builtins;
with import ./utils.nix;
builtinsDump:
let
showBuiltin = name:
let
inherit (builtinsDump.${name}) doc args;
in
''
<dt id="builtins-${name}">
<a href="#builtins-${name}"><code>${name} ${listArgs args}</code></a>
</dt>
<dd>
builtins:
${doc}
</dd>
'';
listArgs = args: builtins.concatStringsSep " " (map (s: "<var>${s}</var>") args);
in
with builtins; concatStringsSep "\n" (map showBuiltin (attrNames builtinsDump))
concatStrings (map
(name:
let builtin = builtins.${name}; in
"<dt id=\"builtins-${name}\"><a href=\"#builtins-${name}\"><code>${name} "
+ concatStringsSep " " (map (s: "<var>${s}</var>") builtin.args)
+ "</code></a></dt>"
+ "<dd>\n\n"
+ builtin.doc
+ "\n\n</dd>"
)
(attrNames builtins))

188
doc/manual/generate-manpage.nix
View file

@ -1,99 +1,115 @@
{ command, renderLinks ? false }:
{ toplevel }:
with builtins;
with import ./utils.nix;
let
showCommand =
{ command, def, filename }:
''
**Warning**: This program is **experimental** and its interface is subject to change.
''
+ "# Name\n\n"
+ "`${command}` - ${def.description}\n\n"
+ "# Synopsis\n\n"
+ showSynopsis { inherit command; args = def.args; }
+ (if def.commands or {} != {}
then
let
categories = sort (x: y: x.id < y.id) (unique (map (cmd: cmd.category) (attrValues def.commands)));
listCommands = cmds:
concatStrings (map (name:
"* "
+ (if renderLinks
then "[`${command} ${name}`](./${appendName filename name}.md)"
else "`${command} ${name}`")
+ " - ${cmds.${name}.description}\n")
(attrNames cmds));
in
"where *subcommand* is one of the following:\n\n"
# FIXME: group by category
+ (if length categories > 1
then
concatStrings (map
(cat:
"**${toString cat.description}:**\n\n"
+ listCommands (filterAttrs (n: v: v.category == cat) def.commands)
+ "\n"
) categories)
+ "\n"
else
listCommands def.commands
+ "\n")
else "")
+ (if def ? doc
then def.doc + "\n\n"
else "")
+ (let s = showOptions def.flags; in
if s != ""
then "# Options\n\n${s}"
else "")
;
showCommand = { command, details, filename, toplevel }:
let
result = ''
> **Warning** \
> This program is **experimental** and its interface is subject to change.
# Name
`${command}` - ${details.description}
# Synopsis
${showSynopsis command details.args}
${maybeSubcommands}
${maybeDocumentation}
${maybeOptions}
'';
showSynopsis = command: args:
let
showArgument = arg: "*${arg.label}*" + (if arg ? arity then "" else "...");
arguments = concatStringsSep " " (map showArgument args);
in ''
`${command}` [*option*...] ${arguments}
'';
maybeSubcommands = if details ? commands && details.commands != {}
then ''
where *subcommand* is one of the following:
${subcommands}
''
else "";
subcommands = if length categories > 1
then listCategories
else listSubcommands details.commands;
categories = sort (x: y: x.id < y.id) (unique (map (cmd: cmd.category) (attrValues details.commands)));
listCategories = concatStrings (map showCategory categories);
showCategory = cat: ''
**${toString cat.description}:**
${listSubcommands (filterAttrs (n: v: v.category == cat) details.commands)}
'';
listSubcommands = cmds: concatStrings (attrValues (mapAttrs showSubcommand cmds));
showSubcommand = name: subcmd: ''
* [`${command} ${name}`](./${appendName filename name}.md) - ${subcmd.description}
'';
maybeDocumentation = if details ? doc then details.doc else "";
maybeOptions = if details.flags == {} then "" else ''
# Options
${showOptions details.flags toplevel.flags}
'';
showOptions = options: commonOptions:
let
allOptions = options // commonOptions;
showCategory = cat: ''
${if cat != "" then "**${cat}:**" else ""}
${listOptions (filterAttrs (n: v: v.category == cat) allOptions)}
'';
listOptions = opts: concatStringsSep "\n" (attrValues (mapAttrs showOption opts));
showOption = name: option:
let
shortName = if option ? shortName then "/ `-${option.shortName}`" else "";
labels = if option ? labels then (concatStringsSep " " (map (s: "*${s}*") option.labels)) else "";
in trim ''
- `--${name}` ${shortName} ${labels}
${option.description}
'';
categories = sort builtins.lessThan (unique (map (cmd: cmd.category) (attrValues allOptions)));
in concatStrings (map showCategory categories);
in squash result;
appendName = filename: name: (if filename == "nix" then "nix3" else filename) + "-" + name;
showOptions = flags:
processCommand = { command, details, filename, toplevel }:
let
categories = sort builtins.lessThan (unique (map (cmd: cmd.category) (attrValues flags)));
in
concatStrings (map
(cat:
(if cat != ""
then "**${cat}:**\n\n"
else "")
+ concatStrings
(map (longName:
let
flag = flags.${longName};
in
" - `--${longName}`"
+ (if flag ? shortName then " / `-${flag.shortName}`" else "")
+ (if flag ? labels then " " + (concatStringsSep " " (map (s: "*${s}*") flag.labels)) else "")
+ " \n"
+ " " + flag.description + "\n\n"
) (attrNames (filterAttrs (n: v: v.category == cat) flags))))
categories);
cmd = {
inherit command;
name = filename + ".md";
value = showCommand { inherit command details filename toplevel; };
};
subcommand = subCmd: processCommand {
command = command + " " + subCmd;
details = details.commands.${subCmd};
filename = appendName filename subCmd;
inherit toplevel;
};
in [ cmd ] ++ concatMap subcommand (attrNames details.commands or {});
showSynopsis =
{ command, args }:
"`${command}` [*option*...] ${concatStringsSep " "
(map (arg: "*${arg.label}*" + (if arg ? arity then "" else "...")) args)}\n\n";
parsedToplevel = builtins.fromJSON toplevel;
manpages = processCommand {
command = "nix";
details = parsedToplevel;
filename = "nix";
toplevel = parsedToplevel;
};
processCommand = { command, def, filename }:
[ { name = filename + ".md"; value = showCommand { inherit command def filename; }; inherit command; } ]
++ concatMap
(name: processCommand {
filename = appendName filename name;
command = command + " " + name;
def = def.commands.${name};
})
(attrNames def.commands or {});
tableOfContents = let
showEntry = page:
" - [${page.command}](command-ref/new-cli/${page.name})";
in concatStringsSep "\n" (map showEntry manpages) + "\n";
in
let
manpages = processCommand { filename = "nix"; command = "nix"; def = builtins.fromJSON command; };
summary = concatStrings (map (manpage: " - [${manpage.command}](command-ref/new-cli/${manpage.name})\n") manpages);
in
(listToAttrs manpages) // { "SUMMARY.md" = summary; }
in (listToAttrs manpages) // { "SUMMARY.md" = tableOfContents; }

66
doc/manual/generate-options.nix
View file

@ -1,29 +1,41 @@
with builtins;
with import ./utils.nix;
let
inherit (builtins) attrNames concatStringsSep isAttrs isBool;
inherit (import ./utils.nix) concatStrings squash splitLines;
in
options:
optionsInfo:
let
showOption = name:
let
inherit (optionsInfo.${name}) description documentDefault defaultValue aliases;
result = squash ''
- <span id="conf-${name}">[`${name}`](#conf-${name})</span>
concatStrings (map
(name:
let option = options.${name}; in
" - [`${name}`](#conf-${name})"
+ "<p id=\"conf-${name}\"></p>\n\n"
+ concatStrings (map (s: " ${s}\n") (splitLines option.description)) + "\n\n"
+ (if option.documentDefault
then " **Default:** " + (
if option.value == "" || option.value == []
then "*empty*"
else if isBool option.value
then (if option.value then "`true`" else "`false`")
else
# n.b. a StringMap value type is specified as a string, but
# this shows the value type. The empty stringmap is "null" in
# JSON, but that converts to "{ }" here.
(if isAttrs option.value then "`\"\"`"
else "`" + toString option.value + "`")) + "\n\n"
else " **Default:** *machine-specific*\n")
+ (if option.aliases != []
then " **Deprecated alias:** " + (concatStringsSep ", " (map (s: "`${s}`") option.aliases)) + "\n\n"
else "")
)
(attrNames options))
${indent " " body}
'';
# separate body to cleanly handle indentation
body = ''
${description}
**Default:** ${showDefault documentDefault defaultValue}
${showAliases aliases}
'';
showDefault = documentDefault: defaultValue:
if documentDefault then
# a StringMap value type is specified as a string, but
# this shows the value type. The empty stringmap is `null` in
# JSON, but that converts to `{ }` here.
if defaultValue == "" || defaultValue == [] || isAttrs defaultValue
then "*empty*"
else if isBool defaultValue then
if defaultValue then "`true`" else "`false`"
else "`${toString defaultValue}`"
else "*machine-specific*";
showAliases = aliases:
if aliases == [] then "" else
"**Deprecated alias:** ${(concatStringsSep ", " (map (s: "`${s}`") aliases))}";
indent = prefix: s:
concatStringsSep "\n" (map (x: if x == "" then x else "${prefix}${x}") (splitLines s));
in result;
in concatStrings (map showOption (attrNames optionsInfo))

22
doc/manual/local.mk
View file

@ -1,5 +1,9 @@
ifeq ($(doc_generate),yes)
MANUAL_SRCS := \
$(call rwildcard, $(d)/src, *.md) \
$(call rwildcard, $(d)/src, */*.md)
# Generate man pages.
man-pages := $(foreach n, \
nix-env.1 nix-build.1 nix-shell.1 nix-store.1 nix-instantiate.1 \
@ -25,19 +29,19 @@ nix-eval = $(dummy-env) $(bindir)/nix eval --experimental-features nix-command -
$(d)/%.1: $(d)/src/command-ref/%.md
@printf "Title: %s\n\n" "$$(basename $@ .1)" > $^.tmp
@cat $^ >> $^.tmp
$(trace-gen) lowdown -sT man -M section=1 $^.tmp -o $@
$(trace-gen) lowdown -sT man --nroff-nolinks -M section=1 $^.tmp -o $@
@rm $^.tmp
$(d)/%.8: $(d)/src/command-ref/%.md
@printf "Title: %s\n\n" "$$(basename $@ .8)" > $^.tmp
@cat $^ >> $^.tmp
$(trace-gen) lowdown -sT man -M section=8 $^.tmp -o $@
$(trace-gen) lowdown -sT man --nroff-nolinks -M section=8 $^.tmp -o $@
@rm $^.tmp
$(d)/nix.conf.5: $(d)/src/command-ref/conf-file.md
@printf "Title: %s\n\n" "$$(basename $@ .5)" > $^.tmp
@cat $^ >> $^.tmp
$(trace-gen) lowdown -sT man -M section=5 $^.tmp -o $@
$(trace-gen) lowdown -sT man --nroff-nolinks -M section=5 $^.tmp -o $@
@rm $^.tmp
$(d)/src/SUMMARY.md: $(d)/src/SUMMARY.md.in $(d)/src/command-ref/new-cli
@ -46,7 +50,7 @@ $(d)/src/SUMMARY.md: $(d)/src/SUMMARY.md.in $(d)/src/command-ref/new-cli
$(d)/src/command-ref/new-cli: $(d)/nix.json $(d)/generate-manpage.nix $(bindir)/nix
@rm -rf $@
$(trace-gen) $(nix-eval) --write-to $@ --expr 'import doc/manual/generate-manpage.nix { command = builtins.readFile $<; renderLinks = true; }'
$(trace-gen) $(nix-eval) --write-to $@ --expr 'import doc/manual/generate-manpage.nix { toplevel = builtins.readFile $<; }'
$(d)/src/command-ref/conf-file.md: $(d)/conf-file.json $(d)/generate-options.nix $(d)/src/command-ref/conf-file-prefix.md $(bindir)/nix
@cat doc/manual/src/command-ref/conf-file-prefix.md > $@.tmp
@ -61,10 +65,10 @@ $(d)/conf-file.json: $(bindir)/nix
$(trace-gen) $(dummy-env) $(bindir)/nix show-config --json --experimental-features nix-command > $@.tmp
@mv $@.tmp $@
$(d)/src/expressions/builtins.md: $(d)/builtins.json $(d)/generate-builtins.nix $(d)/src/expressions/builtins-prefix.md $(bindir)/nix
@cat doc/manual/src/expressions/builtins-prefix.md > $@.tmp
$(d)/src/language/builtins.md: $(d)/builtins.json $(d)/generate-builtins.nix $(d)/src/language/builtins-prefix.md $(bindir)/nix
@cat doc/manual/src/language/builtins-prefix.md > $@.tmp
$(trace-gen) $(nix-eval) --expr 'import doc/manual/generate-builtins.nix (builtins.fromJSON (builtins.readFile $<))' >> $@.tmp
@cat doc/manual/src/expressions/builtins-suffix.md >> $@.tmp
@cat doc/manual/src/language/builtins-suffix.md >> $@.tmp
@mv $@.tmp $@
$(d)/builtins.json: $(bindir)/nix
@ -92,12 +96,12 @@ doc/manual/generated/man1/nix3-manpages: $(d)/src/command-ref/new-cli
if [[ $$name = SUMMARY ]]; then continue; fi; \
printf "Title: %s\n\n" "$$name" > $$tmpFile; \
cat $$i >> $$tmpFile; \
lowdown -sT man -M section=1 $$tmpFile -o $(DESTDIR)$$(dirname $@)/$$name.1; \
lowdown -sT man --nroff-nolinks -M section=1 $$tmpFile -o $(DESTDIR)$$(dirname $@)/$$name.1; \
rm $$tmpFile; \
done
@touch $@
$(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/command-ref/new-cli $(d)/src/command-ref/conf-file.md $(d)/src/expressions/builtins.md $(call rwildcard, $(d)/src, *.md)
$(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/anchors.jq $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/command-ref/new-cli $(d)/src/command-ref/conf-file.md $(d)/src/language/builtins.md
$(trace-gen) RUST_LOG=warn mdbook build doc/manual -d $(DESTDIR)$(docdir)/manual
endif

421
doc/manual/redirects.js Normal file
View file

@ -0,0 +1,421 @@
// redirect rules for anchors ensure backwards compatibility of URLs.
// this must be done on the client side, as web servers do not see the anchor part of the URL.
// redirections are declared as follows:
// each entry has as its key a path matching the requested URL path, relative to the mdBook document root.
//
// IMPORTANT: it must specify the full path with file name and suffix
//
// each entry is itself a set of key-value pairs, where
// - keys are anchors on the matched path.
// - values are redirection targets relative to the current path.
const redirects = {
"index.html": {
"part-advanced-topics": "advanced-topics/advanced-topics.html",
"chap-tuning-cores-and-jobs": "advanced-topics/cores-vs-jobs.html",
"chap-diff-hook": "advanced-topics/diff-hook.html",
"check-dirs-are-unregistered": "advanced-topics/diff-hook.html#check-dirs-are-unregistered",
"chap-distributed-builds": "advanced-topics/distributed-builds.html",
"chap-post-build-hook": "advanced-topics/post-build-hook.html",
"chap-post-build-hook-caveats": "advanced-topics/post-build-hook.html#implementation-caveats",
"part-command-ref": "command-ref/command-ref.html",
"conf-allow-import-from-derivation": "command-ref/conf-file.html#conf-allow-import-from-derivation",
"conf-allow-new-privileges": "command-ref/conf-file.html#conf-allow-new-privileges",
"conf-allowed-uris": "command-ref/conf-file.html#conf-allowed-uris",
"conf-allowed-users": "command-ref/conf-file.html#conf-allowed-users",
"conf-auto-optimise-store": "command-ref/conf-file.html#conf-auto-optimise-store",
"conf-binary-cache-public-keys": "command-ref/conf-file.html#conf-binary-cache-public-keys",
"conf-binary-caches": "command-ref/conf-file.html#conf-binary-caches",
"conf-build-compress-log": "command-ref/conf-file.html#conf-build-compress-log",
"conf-build-cores": "command-ref/conf-file.html#conf-build-cores",
"conf-build-extra-chroot-dirs": "command-ref/conf-file.html#conf-build-extra-chroot-dirs",
"conf-build-extra-sandbox-paths": "command-ref/conf-file.html#conf-build-extra-sandbox-paths",
"conf-build-fallback": "command-ref/conf-file.html#conf-build-fallback",
"conf-build-max-jobs": "command-ref/conf-file.html#conf-build-max-jobs",
"conf-build-max-log-size": "command-ref/conf-file.html#conf-build-max-log-size",
"conf-build-max-silent-time": "command-ref/conf-file.html#conf-build-max-silent-time",
"conf-build-timeout": "command-ref/conf-file.html#conf-build-timeout",
"conf-build-use-chroot": "command-ref/conf-file.html#conf-build-use-chroot",
"conf-build-use-sandbox": "command-ref/conf-file.html#conf-build-use-sandbox",
"conf-build-use-substitutes": "command-ref/conf-file.html#conf-build-use-substitutes",
"conf-build-users-group": "command-ref/conf-file.html#conf-build-users-group",
"conf-builders": "command-ref/conf-file.html#conf-builders",
"conf-builders-use-substitutes": "command-ref/conf-file.html#conf-builders-use-substitutes",
"conf-compress-build-log": "command-ref/conf-file.html#conf-compress-build-log",
"conf-connect-timeout": "command-ref/conf-file.html#conf-connect-timeout",
"conf-cores": "command-ref/conf-file.html#conf-cores",
"conf-diff-hook": "command-ref/conf-file.html#conf-diff-hook",
"conf-env-keep-derivations": "command-ref/conf-file.html#conf-env-keep-derivations",
"conf-extra-binary-caches": "command-ref/conf-file.html#conf-extra-binary-caches",
"conf-extra-platforms": "command-ref/conf-file.html#conf-extra-platforms",
"conf-extra-sandbox-paths": "command-ref/conf-file.html#conf-extra-sandbox-paths",
"conf-extra-substituters": "command-ref/conf-file.html#conf-extra-substituters",
"conf-fallback": "command-ref/conf-file.html#conf-fallback",
"conf-fsync-metadata": "command-ref/conf-file.html#conf-fsync-metadata",
"conf-gc-keep-derivations": "command-ref/conf-file.html#conf-gc-keep-derivations",
"conf-gc-keep-outputs": "command-ref/conf-file.html#conf-gc-keep-outputs",
"conf-hashed-mirrors": "command-ref/conf-file.html#conf-hashed-mirrors",
"conf-http-connections": "command-ref/conf-file.html#conf-http-connections",
"conf-keep-build-log": "command-ref/conf-file.html#conf-keep-build-log",
"conf-keep-derivations": "command-ref/conf-file.html#conf-keep-derivations",
"conf-keep-env-derivations": "command-ref/conf-file.html#conf-keep-env-derivations",
"conf-keep-outputs": "command-ref/conf-file.html#conf-keep-outputs",
"conf-max-build-log-size": "command-ref/conf-file.html#conf-max-build-log-size",
"conf-max-free": "command-ref/conf-file.html#conf-max-free",
"conf-max-jobs": "command-ref/conf-file.html#conf-max-jobs",
"conf-max-silent-time": "command-ref/conf-file.html#conf-max-silent-time",
"conf-min-free": "command-ref/conf-file.html#conf-min-free",
"conf-narinfo-cache-negative-ttl": "command-ref/conf-file.html#conf-narinfo-cache-negative-ttl",
"conf-narinfo-cache-positive-ttl": "command-ref/conf-file.html#conf-narinfo-cache-positive-ttl",
"conf-netrc-file": "command-ref/conf-file.html#conf-netrc-file",
"conf-plugin-files": "command-ref/conf-file.html#conf-plugin-files",
"conf-post-build-hook": "command-ref/conf-file.html#conf-post-build-hook",
"conf-pre-build-hook": "command-ref/conf-file.html#conf-pre-build-hook",
"conf-require-sigs": "command-ref/conf-file.html#conf-require-sigs",
"conf-restrict-eval": "command-ref/conf-file.html#conf-restrict-eval",
"conf-run-diff-hook": "command-ref/conf-file.html#conf-run-diff-hook",
"conf-sandbox": "command-ref/conf-file.html#conf-sandbox",
"conf-sandbox-dev-shm-size": "command-ref/conf-file.html#conf-sandbox-dev-shm-size",
"conf-sandbox-paths": "command-ref/conf-file.html#conf-sandbox-paths",
"conf-secret-key-files": "command-ref/conf-file.html#conf-secret-key-files",
"conf-show-trace": "command-ref/conf-file.html#conf-show-trace",
"conf-stalled-download-timeout": "command-ref/conf-file.html#conf-stalled-download-timeout",
"conf-substitute": "command-ref/conf-file.html#conf-substitute",
"conf-substituters": "command-ref/conf-file.html#conf-substituters",
"conf-system": "command-ref/conf-file.html#conf-system",
"conf-system-features": "command-ref/conf-file.html#conf-system-features",
"conf-tarball-ttl": "command-ref/conf-file.html#conf-tarball-ttl",
"conf-timeout": "command-ref/conf-file.html#conf-timeout",
"conf-trace-function-calls": "command-ref/conf-file.html#conf-trace-function-calls",
"conf-trusted-binary-caches": "command-ref/conf-file.html#conf-trusted-binary-caches",
"conf-trusted-public-keys": "command-ref/conf-file.html#conf-trusted-public-keys",
"conf-trusted-substituters": "command-ref/conf-file.html#conf-trusted-substituters",
"conf-trusted-users": "command-ref/conf-file.html#conf-trusted-users",
"extra-sandbox-paths": "command-ref/conf-file.html#extra-sandbox-paths",
"sec-conf-file": "command-ref/conf-file.html",
"env-NIX_PATH": "command-ref/env-common.html#env-NIX_PATH",
"env-common": "command-ref/env-common.html",
"envar-remote": "command-ref/env-common.html#env-NIX_REMOTE",
"sec-common-env": "command-ref/env-common.html",
"ch-files": "command-ref/files.html",
"ch-main-commands": "command-ref/main-commands.html",
"opt-out-link": "command-ref/nix-build.html#opt-out-link",
"sec-nix-build": "command-ref/nix-build.html",
"sec-nix-channel": "command-ref/nix-channel.html",
"sec-nix-collect-garbage": "command-ref/nix-collect-garbage.html",
"sec-nix-copy-closure": "command-ref/nix-copy-closure.html",
"sec-nix-daemon": "command-ref/nix-daemon.html",
"refsec-nix-env-install-examples": "command-ref/nix-env.html#examples",
"rsec-nix-env-install": "command-ref/nix-env.html#operation---install",
"rsec-nix-env-set": "command-ref/nix-env.html#operation---set",
"rsec-nix-env-set-flag": "command-ref/nix-env.html#operation---set-flag",
"rsec-nix-env-upgrade": "command-ref/nix-env.html#operation---upgrade",
"sec-nix-env": "command-ref/nix-env.html",
"ssec-version-comparisons": "command-ref/nix-env.html#versions",
"sec-nix-hash": "command-ref/nix-hash.html",
"sec-nix-instantiate": "command-ref/nix-instantiate.html",
"sec-nix-prefetch-url": "command-ref/nix-prefetch-url.html",
"sec-nix-shell": "command-ref/nix-shell.html",
"ssec-nix-shell-shebang": "command-ref/nix-shell.html#use-as-a--interpreter",
"nixref-queries": "command-ref/nix-store.html#queries",
"opt-add-root": "command-ref/nix-store.html#opt-add-root",
"refsec-nix-store-dump": "command-ref/nix-store.html#operation---dump",
"refsec-nix-store-export": "command-ref/nix-store.html#operation---export",
"refsec-nix-store-import": "command-ref/nix-store.html#operation---import",
"refsec-nix-store-query": "command-ref/nix-store.html#operation---query",
"refsec-nix-store-verify": "command-ref/nix-store.html#operation---verify",
"rsec-nix-store-gc": "command-ref/nix-store.html#operation---gc",
"rsec-nix-store-generate-binary-cache-key": "command-ref/nix-store.html#operation---generate-binary-cache-key",
"rsec-nix-store-realise": "command-ref/nix-store.html#operation---realise",
"rsec-nix-store-serve": "command-ref/nix-store.html#operation---serve",
"sec-nix-store": "command-ref/nix-store.html",
"opt-I": "command-ref/opt-common.html#opt-I",
"opt-attr": "command-ref/opt-common.html#opt-attr",
"opt-common": "command-ref/opt-common.html",
"opt-cores": "command-ref/opt-common.html#opt-cores",
"opt-log-format": "command-ref/opt-common.html#opt-log-format",
"opt-max-jobs": "command-ref/opt-common.html#opt-max-jobs",
"opt-max-silent-time": "command-ref/opt-common.html#opt-max-silent-time",
"opt-timeout": "command-ref/opt-common.html#opt-timeout",
"sec-common-options": "command-ref/opt-common.html",
"ch-utilities": "command-ref/utilities.html",
"chap-hacking": "contributing/hacking.html",
"adv-attr-allowSubstitutes": "language/advanced-attributes.html#adv-attr-allowSubstitutes",
"adv-attr-allowedReferences": "language/advanced-attributes.html#adv-attr-allowedReferences",
"adv-attr-allowedRequisites": "language/advanced-attributes.html#adv-attr-allowedRequisites",
"adv-attr-disallowedReferences": "language/advanced-attributes.html#adv-attr-disallowedReferences",
"adv-attr-disallowedRequisites": "language/advanced-attributes.html#adv-attr-disallowedRequisites",
"adv-attr-exportReferencesGraph": "language/advanced-attributes.html#adv-attr-exportReferencesGraph",
"adv-attr-impureEnvVars": "language/advanced-attributes.html#adv-attr-impureEnvVars",
"adv-attr-outputHash": "language/advanced-attributes.html#adv-attr-outputHash",
"adv-attr-outputHashAlgo": "language/advanced-attributes.html#adv-attr-outputHashAlgo",
"adv-attr-outputHashMode": "language/advanced-attributes.html#adv-attr-outputHashMode",
"adv-attr-passAsFile": "language/advanced-attributes.html#adv-attr-passAsFile",
"adv-attr-preferLocalBuild": "language/advanced-attributes.html#adv-attr-preferLocalBuild",
"fixed-output-drvs": "language/advanced-attributes.html#adv-attr-outputHash",
"sec-advanced-attributes": "language/advanced-attributes.html",
"builtin-abort": "language/builtins.html#builtins-abort",
"builtin-add": "language/builtins.html#builtins-add",
"builtin-all": "language/builtins.html#builtins-all",
"builtin-any": "language/builtins.html#builtins-any",
"builtin-attrNames": "language/builtins.html#builtins-attrNames",
"builtin-attrValues": "language/builtins.html#builtins-attrValues",
"builtin-baseNameOf": "language/builtins.html#builtins-baseNameOf",
"builtin-bitAnd": "language/builtins.html#builtins-bitAnd",
"builtin-bitOr": "language/builtins.html#builtins-bitOr",
"builtin-bitXor": "language/builtins.html#builtins-bitXor",
"builtin-builtins": "language/builtins.html#builtins-builtins",
"builtin-compareVersions": "language/builtins.html#builtins-compareVersions",
"builtin-concatLists": "language/builtins.html#builtins-concatLists",
"builtin-concatStringsSep": "language/builtins.html#builtins-concatStringsSep",
"builtin-currentSystem": "language/builtins.html#builtins-currentSystem",
"builtin-deepSeq": "language/builtins.html#builtins-deepSeq",
"builtin-derivation": "language/builtins.html#builtins-derivation",
"builtin-dirOf": "language/builtins.html#builtins-dirOf",
"builtin-div": "language/builtins.html#builtins-div",
"builtin-elem": "language/builtins.html#builtins-elem",
"builtin-elemAt": "language/builtins.html#builtins-elemAt",
"builtin-fetchGit": "language/builtins.html#builtins-fetchGit",
"builtin-fetchTarball": "language/builtins.html#builtins-fetchTarball",
"builtin-fetchurl": "language/builtins.html#builtins-fetchurl",
"builtin-filterSource": "language/builtins.html#builtins-filterSource",
"builtin-foldl-prime": "language/builtins.html#builtins-foldl-prime",
"builtin-fromJSON": "language/builtins.html#builtins-fromJSON",
"builtin-functionArgs": "language/builtins.html#builtins-functionArgs",
"builtin-genList": "language/builtins.html#builtins-genList",
"builtin-getAttr": "language/builtins.html#builtins-getAttr",
"builtin-getEnv": "language/builtins.html#builtins-getEnv",
"builtin-hasAttr": "language/builtins.html#builtins-hasAttr",
"builtin-hashFile": "language/builtins.html#builtins-hashFile",
"builtin-hashString": "language/builtins.html#builtins-hashString",
"builtin-head": "language/builtins.html#builtins-head",
"builtin-import": "language/builtins.html#builtins-import",
"builtin-intersectAttrs": "language/builtins.html#builtins-intersectAttrs",
"builtin-isAttrs": "language/builtins.html#builtins-isAttrs",
"builtin-isBool": "language/builtins.html#builtins-isBool",
"builtin-isFloat": "language/builtins.html#builtins-isFloat",
"builtin-isFunction": "language/builtins.html#builtins-isFunction",
"builtin-isInt": "language/builtins.html#builtins-isInt",
"builtin-isList": "language/builtins.html#builtins-isList",
"builtin-isNull": "language/builtins.html#builtins-isNull",
"builtin-isString": "language/builtins.html#builtins-isString",
"builtin-length": "language/builtins.html#builtins-length",
"builtin-lessThan": "language/builtins.html#builtins-lessThan",
"builtin-listToAttrs": "language/builtins.html#builtins-listToAttrs",
"builtin-map": "language/builtins.html#builtins-map",
"builtin-match": "language/builtins.html#builtins-match",
"builtin-mul": "language/builtins.html#builtins-mul",
"builtin-parseDrvName": "language/builtins.html#builtins-parseDrvName",
"builtin-path": "language/builtins.html#builtins-path",
"builtin-pathExists": "language/builtins.html#builtins-pathExists",
"builtin-placeholder": "language/builtins.html#builtins-placeholder",
"builtin-readDir": "language/builtins.html#builtins-readDir",
"builtin-readFile": "language/builtins.html#builtins-readFile",
"builtin-removeAttrs": "language/builtins.html#builtins-removeAttrs",
"builtin-replaceStrings": "language/builtins.html#builtins-replaceStrings",
"builtin-seq": "language/builtins.html#builtins-seq",
"builtin-sort": "language/builtins.html#builtins-sort",
"builtin-split": "language/builtins.html#builtins-split",
"builtin-splitVersion": "language/builtins.html#builtins-splitVersion",
"builtin-stringLength": "language/builtins.html#builtins-stringLength",
"builtin-sub": "language/builtins.html#builtins-sub",
"builtin-substring": "language/builtins.html#builtins-substring",
"builtin-tail": "language/builtins.html#builtins-tail",
"builtin-throw": "language/builtins.html#builtins-throw",
"builtin-toFile": "language/builtins.html#builtins-toFile",
"builtin-toJSON": "language/builtins.html#builtins-toJSON",
"builtin-toPath": "language/builtins.html#builtins-toPath",
"builtin-toString": "language/builtins.html#builtins-toString",
"builtin-toXML": "language/builtins.html#builtins-toXML",
"builtin-trace": "language/builtins.html#builtins-trace",
"builtin-tryEval": "language/builtins.html#builtins-tryEval",
"builtin-typeOf": "language/builtins.html#builtins-typeOf",
"ssec-builtins": "language/builtins.html",
"attr-system": "language/derivations.html#attr-system",
"ssec-derivation": "language/derivations.html",
"ch-expression-language": "language/index.html",
"sec-constructs": "language/constructs.html",
"sect-let-language": "language/constructs.html#let-language",
"ss-functions": "language/constructs.html#functions",
"sec-language-operators": "language/operators.html",
"table-operators": "language/operators.html",
"ssec-values": "language/values.html",
"gloss-closure": "glossary.html#gloss-closure",
"gloss-derivation": "glossary.html#gloss-derivation",
"gloss-deriver": "glossary.html#gloss-deriver",
"gloss-nar": "glossary.html#gloss-nar",
"gloss-output-path": "glossary.html#gloss-output-path",
"gloss-profile": "glossary.html#gloss-profile",
"gloss-reachable": "glossary.html#gloss-reachable",
"gloss-reference": "glossary.html#gloss-reference",
"gloss-substitute": "glossary.html#gloss-substitute",
"gloss-user-env": "glossary.html#gloss-user-env",
"gloss-validity": "glossary.html#gloss-validity",
"part-glossary": "glossary.html",
"sec-building-source": "installation/building-source.html",
"ch-env-variables": "installation/env-variables.html",
"sec-installer-proxy-settings": "installation/env-variables.html#proxy-environment-variables",
"sec-nix-ssl-cert-file": "installation/env-variables.html#nix_ssl_cert_file",
"sec-nix-ssl-cert-file-with-nix-daemon-and-macos": "installation/env-variables.html#nix_ssl_cert_file-with-macos-and-the-nix-daemon",
"chap-installation": "installation/installation.html",
"ch-installing-binary": "installation/installing-binary.html",
"sect-macos-installation": "installation/installing-binary.html#macos-installation",
"sect-macos-installation-change-store-prefix": "installation/installing-binary.html#macos-installation",
"sect-macos-installation-encrypted-volume": "installation/installing-binary.html#macos-installation",
"sect-macos-installation-recommended-notes": "installation/installing-binary.html#macos-installation",
"sect-macos-installation-symlink": "installation/installing-binary.html#macos-installation",
"sect-multi-user-installation": "installation/installing-binary.html#multi-user-installation",
"sect-nix-install-binary-tarball": "installation/installing-binary.html#installing-from-a-binary-tarball",
"sect-nix-install-pinned-version-url": "installation/installing-binary.html#installing-a-pinned-nix-version-from-a-url",
"sect-single-user-installation": "installation/installing-binary.html#single-user-installation",
"ch-installing-source": "installation/installing-source.html",
"ssec-multi-user": "installation/multi-user.html",
"ch-nix-security": "installation/nix-security.html",
"sec-obtaining-source": "installation/obtaining-source.html",
"sec-prerequisites-source": "installation/prerequisites-source.html",
"sec-single-user": "installation/single-user.html",
"ch-supported-platforms": "installation/supported-platforms.html",
"ch-upgrading-nix": "installation/upgrading.html",
"ch-about-nix": "introduction.html",
"chap-introduction": "introduction.html",
"ch-basic-package-mgmt": "package-management/basic-package-mgmt.html",
"ssec-binary-cache-substituter": "package-management/binary-cache-substituter.html",
"sec-channels": "package-management/channels.html",
"ssec-copy-closure": "package-management/copy-closure.html",
"sec-garbage-collection": "package-management/garbage-collection.html",
"ssec-gc-roots": "package-management/garbage-collector-roots.html",
"chap-package-management": "package-management/package-management.html",
"sec-profiles": "package-management/profiles.html",
"ssec-s3-substituter": "package-management/s3-substituter.html",
"ssec-s3-substituter-anonymous-reads": "package-management/s3-substituter.html#anonymous-reads-to-your-s3-compatible-binary-cache",
"ssec-s3-substituter-authenticated-reads": "package-management/s3-substituter.html#authenticated-reads-to-your-s3-binary-cache",
"ssec-s3-substituter-authenticated-writes": "package-management/s3-substituter.html#authenticated-writes-to-your-s3-compatible-binary-cache",
"sec-sharing-packages": "package-management/sharing-packages.html",
"ssec-ssh-substituter": "package-management/ssh-substituter.html",
"chap-quick-start": "quick-start.html",
"sec-relnotes": "release-notes/release-notes.html",
"ch-relnotes-0.10.1": "release-notes/rl-0.10.1.html",
"ch-relnotes-0.10": "release-notes/rl-0.10.html",
"ssec-relnotes-0.11": "release-notes/rl-0.11.html",
"ssec-relnotes-0.12": "release-notes/rl-0.12.html",
"ssec-relnotes-0.13": "release-notes/rl-0.13.html",
"ssec-relnotes-0.14": "release-notes/rl-0.14.html",
"ssec-relnotes-0.15": "release-notes/rl-0.15.html",
"ssec-relnotes-0.16": "release-notes/rl-0.16.html",
"ch-relnotes-0.5": "release-notes/rl-0.5.html",
"ch-relnotes-0.6": "release-notes/rl-0.6.html",
"ch-relnotes-0.7": "release-notes/rl-0.7.html",
"ch-relnotes-0.8.1": "release-notes/rl-0.8.1.html",
"ch-relnotes-0.8": "release-notes/rl-0.8.html",
"ch-relnotes-0.9.1": "release-notes/rl-0.9.1.html",
"ch-relnotes-0.9.2": "release-notes/rl-0.9.2.html",
"ch-relnotes-0.9": "release-notes/rl-0.9.html",
"ssec-relnotes-1.0": "release-notes/rl-1.0.html",
"ssec-relnotes-1.1": "release-notes/rl-1.1.html",
"ssec-relnotes-1.10": "release-notes/rl-1.10.html",
"ssec-relnotes-1.11.10": "release-notes/rl-1.11.10.html",
"ssec-relnotes-1.11": "release-notes/rl-1.11.html",
"ssec-relnotes-1.2": "release-notes/rl-1.2.html",
"ssec-relnotes-1.3": "release-notes/rl-1.3.html",
"ssec-relnotes-1.4": "release-notes/rl-1.4.html",
"ssec-relnotes-1.5.1": "release-notes/rl-1.5.1.html",
"ssec-relnotes-1.5.2": "release-notes/rl-1.5.2.html",
"ssec-relnotes-1.5": "release-notes/rl-1.5.html",
"ssec-relnotes-1.6.1": "release-notes/rl-1.6.1.html",
"ssec-relnotes-1.6.0": "release-notes/rl-1.6.html",
"ssec-relnotes-1.7": "release-notes/rl-1.7.html",
"ssec-relnotes-1.8": "release-notes/rl-1.8.html",
"ssec-relnotes-1.9": "release-notes/rl-1.9.html",
"ssec-relnotes-2.0": "release-notes/rl-2.0.html",
"ssec-relnotes-2.1": "release-notes/rl-2.1.html",
"ssec-relnotes-2.2": "release-notes/rl-2.2.html",
"ssec-relnotes-2.3": "release-notes/rl-2.3.html"
},
"language/values.html": {
"simple-values": "#primitives",
"lists": "#list",
"strings": "#string",
"lists": "#list",
"attribute-sets": "#attribute-set"
}
};
// the following code matches the current page's URL against the set of redirects.
//
// it is written to minimize the latency between page load and redirect.
// therefore we avoid function calls, copying data, and unnecessary loops.
// IMPORTANT: we use stateful array operations and their order matters!
//
// matching URLs is more involved than it should be:
//
// 1. `document.location.pathname` can have an arbitrary prefix.
//
// 2. `path_to_root` is set by mdBook. it consists only of `../`s and
// determines the depth of `<path>` relative to the prefix:
//
// `document.location.pathname`
// |------------------------------|
// /<prefix>/<path>/[<file>[.html]][#<anchor>]
// |----|
// `path_to_root` has same number of path segments
//
// source: https://phaiax.github.io/mdBook/format/theme/index-hbs.html#data
//
// 3. the following paths are equivalent:
//
// /foo/bar/
// /foo/bar/index.html
// /foo/bar/index
//
// 4. the following paths are also equivalent:
//
// /foo/bar/baz
// /foo/bar/baz.html
//
let segments = document.location.pathname.split('/');
let file = segments.pop();
// normalize file name
if (file === '') { file = "index.html"; }
else if (!file.endsWith('.html')) { file = file + '.html'; }
segments.push(file);
// use `path_to_root` to discern prefix from path.
const depth = path_to_root.split('/').length;
// remove segments containing prefix. the following works because
// 1. the original `document.location.pathname` is absolute,
// hence first element of `segments` is always empty.
// 2. last element of splitting `path_to_root` is also always empty.
// 3. last element of `segments` is the file name.
//
// visual example:
//
// '/foo/bar/baz.html'.split('/') -> [ '', 'foo', 'bar', 'baz.html' ]
// '../'.split('/') -> [ '..', '' ]
//
// the following operations will then result in
//
// path = 'bar/baz.html'
//
segments.splice(0, segments.length - depth);
const path = segments.join('/');
// anchor starts with the hash character (`#`),
// but our redirect declarations don't, so we strip it.
// example:
// document.location.hash -> '#foo'
// document.location.hash.substring(1) -> 'foo'
const anchor = document.location.hash.substring(1);
const redirect = redirects[path];
if (redirect) {
const target = redirect[anchor];
if (target) {
document.location.href = target;
}
}

29
doc/manual/src/SUMMARY.md.in
View file

@ -26,21 +26,15 @@
- [Copying Closures via SSH](package-management/copy-closure.md)
- [Serving a Nix store via SSH](package-management/ssh-substituter.md)
- [Serving a Nix store via S3](package-management/s3-substituter.md)
- [Writing Nix Expressions](expressions/writing-nix-expressions.md)
- [A Simple Nix Expression](expressions/simple-expression.md)
- [Expression Syntax](expressions/expression-syntax.md)
- [Build Script](expressions/build-script.md)
- [Arguments and Variables](expressions/arguments-variables.md)
- [Building and Testing](expressions/simple-building-testing.md)
- [Generic Builder Syntax](expressions/generic-builder.md)
- [Writing Nix Expressions](expressions/expression-language.md)
- [Values](expressions/language-values.md)
- [Language Constructs](expressions/language-constructs.md)
- [Operators](expressions/language-operators.md)
- [Derivations](expressions/derivations.md)
- [Advanced Attributes](expressions/advanced-attributes.md)
- [Built-in Constants](expressions/builtin-constants.md)
- [Built-in Functions](expressions/builtins.md)
- [Nix Language](language/index.md)
- [Data Types](language/values.md)
- [Language Constructs](language/constructs.md)
- [String interpolation](language/string-interpolation.md)
- [Operators](language/operators.md)
- [Derivations](language/derivations.md)
- [Advanced Attributes](language/advanced-attributes.md)
- [Built-in Constants](language/builtin-constants.md)
- [Built-in Functions](language/builtins.md)
- [Advanced Topics](advanced-topics/advanced-topics.md)
- [Remote Builds](advanced-topics/distributed-builds.md)
- [Tuning Cores and Jobs](advanced-topics/cores-vs-jobs.md)
@ -66,12 +60,17 @@
@manpages@
- [Files](command-ref/files.md)
- [nix.conf](command-ref/conf-file.md)
- [Architecture](architecture/architecture.md)
- [Glossary](glossary.md)
- [Contributing](contributing/contributing.md)
- [Hacking](contributing/hacking.md)
- [CLI guideline](contributing/cli-guideline.md)
- [Release Notes](release-notes/release-notes.md)
- [Release X.Y (202?-??-??)](release-notes/rl-next.md)
- [Release 2.12 (2022-12-06)](release-notes/rl-2.12.md)
- [Release 2.11 (2022-08-25)](release-notes/rl-2.11.md)
- [Release 2.10 (2022-07-11)](release-notes/rl-2.10.md)
- [Release 2.9 (2022-05-30)](release-notes/rl-2.9.md)
- [Release 2.8 (2022-04-19)](release-notes/rl-2.8.md)
- [Release 2.7 (2022-03-07)](release-notes/rl-2.7.md)
- [Release 2.6 (2022-01-24)](release-notes/rl-2.6.md)

36
doc/manual/src/advanced-topics/diff-hook.md
View file

@ -101,7 +101,7 @@ In particular, notice the
`/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable.check` output. Nix
has copied the build results to that directory where you can examine it.
> **Note**
> []{#check-dirs-are-unregistered} **Note**
>
> Check paths are not protected against garbage collection, and this
> path will be deleted on the next garbage collection.
@ -121,37 +121,3 @@ error:
are not valid, so checking is not possible
Run the build without `--check`, and then try with `--check` again.
# Automatic and Optionally Enforced Determinism Verification
Automatically verify every build at build time by executing the build
multiple times.
Setting `repeat` and `enforce-determinism` in your `nix.conf` permits
the automated verification of every build Nix performs.
The following configuration will run each build three times, and will
require the build to be deterministic:
enforce-determinism = true
repeat = 2
Setting `enforce-determinism` to false as in the following
configuration will run the build multiple times, execute the build
hook, but will allow the build to succeed even if it does not build
reproducibly:
enforce-determinism = false
repeat = 1
An example output of this configuration:
```console
$ nix-build ./test.nix -A unstable
this derivation will be built:
/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv
building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 1/2)...
building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 2/2)...
output '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable' of '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' differs from '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable.check' from previous round
/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable
```

4
doc/manual/src/advanced-topics/distributed-builds.md
View file

@ -12,14 +12,14 @@ machine is accessible via SSH and that it has Nix installed. You can
test whether connecting to the remote Nix instance works, e.g.
```console
$ nix ping-store --store ssh://mac
$ nix store ping --store ssh://mac
```
will try to connect to the machine named `mac`. It is possible to
specify an SSH identity file as part of the remote store URI, e.g.
```console
$ nix ping-store --store ssh://mac?ssh-key=/home/alice/my-key
$ nix store ping --store ssh://mac?ssh-key=/home/alice/my-key
```
Since builds should be non-interactive, the key should not have a

15
doc/manual/src/advanced-topics/post-build-hook.md
View file

@ -33,12 +33,17 @@ distribute the public key for verifying the authenticity of the paths.
example-nix-cache-1:1/cKDz3QCCOmwcztD2eV6Coggp6rqc9DGjWv7C0G+rM=
```
Then, add the public key and the cache URL to your `nix.conf`'s
`trusted-public-keys` and `substituters` options:
Then update [`nix.conf`](../command-ref/conf-file.md) on any machine that will access the cache.
Add the cache URL to [`substituters`](../command-ref/conf-file.md#conf-substituters) and the public key to [`trusted-public-keys`](../command-ref/conf-file.md#conf-trusted-public-keys):
substituters = https://cache.nixos.org/ s3://example-nix-cache
trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= example-nix-cache-1:1/cKDz3QCCOmwcztD2eV6Coggp6rqc9DGjWv7C0G+rM=
Machines that build for the cache must sign derivations using the private key.
On those machines, add the path to the key file to the [`secret-key-files`](../command-ref/conf-file.md#conf-secret-key-files) field in their [`nix.conf`](../command-ref/conf-file.md):
secret-key-files = /etc/nix/key.private
We will restart the Nix daemon in a later step.
# Implementing the build hook
@ -52,14 +57,12 @@ set -eu
set -f # disable globbing
export IFS=' '
echo "Signing paths" $OUT_PATHS
nix store sign --key-file /etc/nix/key.private $OUT_PATHS
echo "Uploading paths" $OUT_PATHS
exec nix copy --to 's3://example-nix-cache' $OUT_PATHS
exec nix copy --to "s3://example-nix-cache" $OUT_PATHS
```
> **Note**
>
>
> The `$OUT_PATHS` variable is a space-separated list of Nix store
> paths. In this case, we expect and want the shell to perform word
> splitting to make each output path its own argument to `nix

115
doc/manual/src/architecture/architecture.md Normal file
View file

@ -0,0 +1,115 @@
# Architecture
This chapter describes how Nix works.
It should help users understand why Nix behaves as it does, and it should help developers understand how to modify Nix and how to write similar tools.
## Overview
Nix consists of [hierarchical layers].
[hierarchical layers]: https://en.m.wikipedia.org/wiki/Multitier_architecture#Layers
The following [concept map] shows its main components (rectangles), the objects they operate on (rounded rectangles), and their interactions (connecting phrases):
[concept map]: https://en.m.wikipedia.org/wiki/Concept_map
```
.----------------.
| Nix expression |----------.
'----------------' |
| passed to
| |
+----------|-------------------|--------------------------------+
| Nix | V |
| | +-------------------------+ |
| | | commmand line interface |------. |
| | +-------------------------+ | |
| | | | |
| evaluated by calls manages |
| | | | |
| | V | |
| | +--------------------+ | |
| '-------->| language evaluator | | |
| +--------------------+ | |
| | | |
| produces | |
| | V |
| +----------------------------|------------------------------+ |
| | store | | |
| | referenced by V builds | |
| | .-------------. .------------. .--------------. | |
| | | build input |----->| build plan |----->| build result | | |
| | '-------------' '------------' '--------------' | |
| +-------------------------------------------------|---------+ |
+---------------------------------------------------|-----------+
|
represented as
|
V
.---------------.
| file |
'---------------'
```
At the top is the [command line interface](../command-ref/command-ref.md) that drives the underlying layers.
The [Nix language](../language/index.md) evaluator transforms Nix expressions into self-contained *build plans*, which are used to derive *build results* from referenced *build inputs*.
The command line interface and Nix expressions are what users deal with most.
> **Note**
> The Nix language itself does not have a notion of *packages* or *configurations*.
> As far as we are concerned here, the inputs and results of a build plan are just data.
Underlying the command line interface and the Nix language evaluator is the [Nix store](../glossary.md#gloss-store), a mechanism to keep track of build plans, data, and references between them.
It can also execute build plans to produce new data, which are made available to the operating system as files.
A build plan itself is a series of *build tasks*, together with their build inputs.
> **Important**
> A build task in Nix is called [derivation](../glossary#gloss-derivation).
Each build task has a special build input executed as *build instructions* in order to perform the build.
The result of a build task can be input to another build task.
The following [data flow diagram] shows a build plan for illustration.
Build inputs used as instructions to a build task are marked accordingly:
[data flow diagram]: https://en.m.wikipedia.org/wiki/Data-flow_diagram
```
+--------------------------------------------------------------------+
| build plan |
| |
| .-------------. |
| | build input |---------. |
| '-------------' | |
| instructions |
| | |
| v |
| .-------------. .----------. |
| | build input |-->( build task )-------. |
| '-------------' '----------' | |
| instructions |
| | |
| v |
| .-------------. .----------. .--------------. |
| | build input |---------. ( build task )--->| build result | |
| '-------------' | '----------' '--------------' |
| instructions ^ |
| | | |
| v | |
| .-------------. .----------. | |
| | build input |-->( build task )-------' |
| '-------------' '----------' |
| ^ |
| | |
| | |
| .-------------. | |
| | build input |---------' |
| '-------------' |
| |
+--------------------------------------------------------------------+
```

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@ -2,49 +2,18 @@
Most Nix commands interpret the following environment variables:
- `IN_NIX_SHELL`\
- [`IN_NIX_SHELL`]{#env-IN_NIX_SHELL}\
Indicator that tells if the current environment was set up by
`nix-shell`. Since Nix 2.0 the values are `"pure"` and `"impure"`
`nix-shell`. It can have the values `pure` or `impure`.
- `NIX_PATH`\
A colon-separated list of directories used to look up Nix
expressions enclosed in angle brackets (i.e., `<path>`). For
instance, the value
- [`NIX_PATH`]{#env-NIX_PATH}\
A colon-separated list of directories used to look up the location of Nix
expressions using [paths](../language/values.md#type-path)
enclosed in angle brackets (i.e., `<path>`),
e.g. `/home/eelco/Dev:/etc/nixos`. It can be extended using the
[`-I` option](./opt-common#opt-I).
/home/eelco/Dev:/etc/nixos
will cause Nix to look for paths relative to `/home/eelco/Dev` and
`/etc/nixos`, in this order. It is also possible to match paths
against a prefix. For example, the value
nixpkgs=/home/eelco/Dev/nixpkgs-branch:/etc/nixos
will cause Nix to search for `<nixpkgs/path>` in
`/home/eelco/Dev/nixpkgs-branch/path` and `/etc/nixos/nixpkgs/path`.
If a path in the Nix search path starts with `http://` or
`https://`, it is interpreted as the URL of a tarball that will be
downloaded and unpacked to a temporary location. The tarball must
consist of a single top-level directory. For example, setting
`NIX_PATH` to
nixpkgs=https://github.com/NixOS/nixpkgs/archive/master.tar.gz
tells Nix to download and use the current contents of the
`master` branch in the `nixpkgs` repository.
The URLs of the tarballs from the official nixos.org channels (see
[the manual for `nix-channel`](nix-channel.md)) can be abbreviated
as `channel:<channel-name>`. For instance, the following two
values of `NIX_PATH` are equivalent:
nixpkgs=channel:nixos-21.05
nixpkgs=https://nixos.org/channels/nixos-21.05/nixexprs.tar.xz
The Nix search path can also be extended using the `-I` option to
many Nix commands, which takes precedence over `NIX_PATH`.
- `NIX_IGNORE_SYMLINK_STORE`\
- [`NIX_IGNORE_SYMLINK_STORE`]{#env-NIX_IGNORE_SYMLINK_STORE}\
Normally, the Nix store directory (typically `/nix/store`) is not
allowed to contain any symlink components. This is to prevent
“impure” builds. Builders sometimes “canonicalise” paths by
@ -66,41 +35,41 @@ Most Nix commands interpret the following environment variables:
Consult the mount 8 manual page for details.
- `NIX_STORE_DIR`\
- [`NIX_STORE_DIR`]{#env-NIX_STORE_DIR}\
Overrides the location of the Nix store (default `prefix/store`).
- `NIX_DATA_DIR`\
- [`NIX_DATA_DIR`]{#env-NIX_DATA_DIR}\
Overrides the location of the Nix static data directory (default
`prefix/share`).
- `NIX_LOG_DIR`\
- [`NIX_LOG_DIR`]{#env-NIX_LOG_DIR}\
Overrides the location of the Nix log directory (default
`prefix/var/log/nix`).
- `NIX_STATE_DIR`\
- [`NIX_STATE_DIR`]{#env-NIX_STATE_DIR}\
Overrides the location of the Nix state directory (default
`prefix/var/nix`).
- `NIX_CONF_DIR`\
- [`NIX_CONF_DIR`]{#env-NIX_CONF_DIR}\
Overrides the location of the system Nix configuration directory
(default `prefix/etc/nix`).
- `NIX_CONFIG`\
- [`NIX_CONFIG`]{#env-NIX_CONFIG}\
Applies settings from Nix configuration from the environment.
The content is treated as if it was read from a Nix configuration file.
Settings are separated by the newline character.
- `NIX_USER_CONF_FILES`\
- [`NIX_USER_CONF_FILES`]{#env-NIX_USER_CONF_FILES}\
Overrides the location of the user Nix configuration files to load
from (defaults to the XDG spec locations). The variable is treated
as a list separated by the `:` token.
- `TMPDIR`\
- [`TMPDIR`]{#env-TMPDIR}\
Use the specified directory to store temporary files. In particular,
this includes temporary build directories; these can take up
substantial amounts of disk space. The default is `/tmp`.
- `NIX_REMOTE`\
- [`NIX_REMOTE`]{#env-NIX_REMOTE}\
This variable should be set to `daemon` if you want to use the Nix
daemon to execute Nix operations. This is necessary in [multi-user
Nix installations](../installation/multi-user.md). If the Nix
@ -108,16 +77,16 @@ Most Nix commands interpret the following environment variables:
should be set to `unix://path/to/socket`. Otherwise, it should be
left unset.
- `NIX_SHOW_STATS`\
- [`NIX_SHOW_STATS`]{#env-NIX_SHOW_STATS}\
If set to `1`, Nix will print some evaluation statistics, such as
the number of values allocated.
- `NIX_COUNT_CALLS`\
- [`NIX_COUNT_CALLS`]{#env-NIX_COUNT_CALLS}\
If set to `1`, Nix will print how often functions were called during
Nix expression evaluation. This is useful for profiling your Nix
expressions.
- `GC_INITIAL_HEAP_SIZE`\
- [`GC_INITIAL_HEAP_SIZE`]{#env-GC_INITIAL_HEAP_SIZE}\
If Nix has been configured to use the Boehm garbage collector, this
variable sets the initial size of the heap in bytes. It defaults to
384 MiB. Setting it to a low value reduces memory consumption, but

22
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@ -12,6 +12,12 @@
[`--dry-run`]
[{`--out-link` | `-o`} *outlink*]
# Disambiguation
This man page describes the command `nix-build`, which is distinct from `nix
build`. For documentation on the latter, run `nix build --help` or see `man
nix3-build`.
# Description
The `nix-build` command builds the derivations described by the Nix
@ -31,10 +37,12 @@ directory containing at least a file named `default.nix`.
`nix-build` is essentially a wrapper around
[`nix-instantiate`](nix-instantiate.md) (to translate a high-level Nix
expression to a low-level store derivation) and [`nix-store
expression to a low-level [store derivation]) and [`nix-store
--realise`](nix-store.md#operation---realise) (to build the store
derivation).
[store derivation]: ../glossary.md#gloss-store-derivation
> **Warning**
>
> The result of the build is automatically registered as a root of the
@ -47,16 +55,18 @@ All options not listed here are passed to `nix-store
--realise`, except for `--arg` and `--attr` / `-A` which are passed to
`nix-instantiate`.
- `--no-out-link`\
- <span id="opt-no-out-link">[`--no-out-link`](#opt-no-out-link)<span>
Do not create a symlink to the output path. Note that as a result
the output does not become a root of the garbage collector, and so
might be deleted by `nix-store
--gc`.
might be deleted by `nix-store --gc`.
- <span id="opt-dry-run">[`--dry-run`](#opt-dry-run)</span>
- `--dry-run`\
Show what store paths would be built or downloaded.
- `--out-link` / `-o` *outlink*\
- <span id="opt-out-link">[`--out-link`](#opt-out-link)</span> / `-o` *outlink*
Change the name of the symlink to the output path created from
`result` to *outlink*.

8
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@ -30,8 +30,8 @@ Since `nix-copy-closure` calls `ssh`, you may be asked to type in the
appropriate password or passphrase. In fact, you may be asked _twice_
because `nix-copy-closure` currently connects twice to the remote
machine, first to get the set of paths missing on the target machine,
and second to send the dump of those paths. If this bothers you, use
`ssh-agent`.
and second to send the dump of those paths. When using public key
authentication, you can avoid typing the passphrase with `ssh-agent`.
# Options
@ -47,7 +47,9 @@ and second to send the dump of those paths. If this bothers you, use
Enable compression of the SSH connection.
- `--include-outputs`\
Also copy the outputs of store derivations included in the closure.
Also copy the outputs of [store derivation]s included in the closure.
[store derivation]: ../../glossary.md#gloss-store-derivation
- `--use-substitutes` / `-s`\
Attempt to download missing paths on the target machine using Nix’s

4
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@ -8,6 +8,6 @@
# Description
The Nix daemon is necessary in multi-user Nix installations. It performs
build actions and other operations on the Nix store on behalf of
The Nix daemon is necessary in multi-user Nix installations. It runs
build tasks and other operations on the Nix store on behalf of
unprivileged users.

14
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@ -31,7 +31,7 @@ subcommand to be performed. These are documented below.
Several commands, such as `nix-env -q` and `nix-env -i`, take a list of
arguments that specify the packages on which to operate. These are
extended regular expressions that must match the entire name of the
package. (For details on regular expressions, see regex7.) The match is
package. (For details on regular expressions, see **regex**(7).) The match is
case-sensitive. The regular expression can optionally be followed by a
dash and a version number; if omitted, any version of the package will
match. Here are some examples:
@ -198,17 +198,19 @@ a number of possible ways:
another.
- If `--from-expression` is given, *args* are Nix
[functions](../expressions/language-constructs.md#functions)
[functions](../language/constructs.md#functions)
that are called with the active Nix expression as their single
argument. The derivations returned by those function calls are
installed. This allows derivations to be specified in an
unambiguous way, which is necessary if there are multiple
derivations with the same name.
- If *args* are store derivations, then these are
- If *args* are [store derivation]s, then these are
[realised](nix-store.md#operation---realise), and the resulting output paths
are installed.
[store derivation]: ../glossary.md#gloss-store-derivation
- If *args* are store paths that are not store derivations, then these
are [realised](nix-store.md#operation---realise) and installed.
@ -280,7 +282,7 @@ To copy the store path with symbolic name `gcc` from another profile:
$ nix-env -i --from-profile /nix/var/nix/profiles/foo gcc
```
To install a specific store derivation (typically created by
To install a specific [store derivation] (typically created by
`nix-instantiate`):
```console
@ -412,7 +414,7 @@ The upgrade operation determines whether a derivation `y` is an upgrade
of a derivation `x` by looking at their respective `name` attributes.
The names (e.g., `gcc-3.3.1` are split into two parts: the package name
(`gcc`), and the version (`3.3.1`). The version part starts after the
first dash not followed by a letter. `x` is considered an upgrade of `y`
first dash not followed by a letter. `y` is considered an upgrade of `x`
if their package names match, and the version of `y` is higher than that
of `x`.
@ -665,7 +667,7 @@ derivation is shown unless `--no-name` is specified.
Print the `system` attribute of the derivation.
- `--drv-path`\
Print the path of the store derivation.
Print the path of the [store derivation].
- `--out-path`\
Print the output path of the derivation.

14
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@ -17,13 +17,14 @@
# Description
The command `nix-instantiate` generates [store
derivations](../glossary.md) from (high-level) Nix expressions. It
evaluates the Nix expressions in each of *files* (which defaults to
The command `nix-instantiate` produces [store derivation]s from (high-level) Nix expressions.
It evaluates the Nix expressions in each of *files* (which defaults to
*./default.nix*). Each top-level expression should evaluate to a
derivation, a list of derivations, or a set of derivations. The paths
of the resulting store derivations are printed on standard output.
[store derivation]: ../glossary.md#gloss-store-derivation
If *files* is the character `-`, then a Nix expression will be read from
standard input.
@ -51,7 +52,7 @@ standard input.
- `--strict`\
When used with `--eval`, recursively evaluate list elements and
attributes. Normally, such sub-expressions are left unevaluated
(since the Nix expression language is lazy).
(since the Nix language is lazy).
> **Warning**
>
@ -66,7 +67,7 @@ standard input.
When used with `--eval`, print the resulting value as an XML
representation of the abstract syntax tree rather than as an ATerm.
The schema is the same as that used by the [`toXML`
built-in](../expressions/builtins.md).
built-in](../language/builtins.md).
- `--read-write-mode`\
When used with `--eval`, perform evaluation in read/write mode so
@ -79,8 +80,7 @@ standard input.
# Examples
Instantiating store derivations from a Nix expression, and building them
using `nix-store`:
Instantiate [store derivation]s from a Nix expression, and build them using `nix-store`:
```console
$ nix-instantiate test.nix (instantiate)

6
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@ -15,6 +15,12 @@
[`--keep` *name*]
{{`--packages` | `-p`} {*packages* | *expressions*} … | [*path*]}
# Disambiguation
This man page describes the command `nix-shell`, which is distinct from `nix
shell`. For documentation on the latter, run `nix shell --help` or see `man
nix3-shell`.
# Description
The command `nix-shell` will build the dependencies of the specified

25
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@ -22,7 +22,8 @@ This section lists the options that are common to all operations. These
options are allowed for every subcommand, though they may not always
have an effect.
- `--add-root` *path*\
- <span id="opt-add-root">[`--add-root`](#opt-add-root)</span> *path*
Causes the result of a realisation (`--realise` and
`--force-realise`) to be registered as a root of the garbage
collector. *path* will be created as a symlink to the resulting
@ -71,7 +72,7 @@ paths. Realisation is a somewhat overloaded term:
outputs are already valid, in which case we are done
immediately. Otherwise, there may be [substitutes](../glossary.md)
that produce the outputs (e.g., by downloading them). Finally, the
outputs can be produced by performing the build action described
outputs can be produced by running the build task described
by the derivation.
- If the store path is not a derivation, realisation ensures that the
@ -104,10 +105,6 @@ The following flags are available:
previous build, the new output path is left in
`/nix/store/name.check.`
See also the `build-repeat` configuration option, which repeats a
derivation a number of times and prevents its outputs from being
registered as “valid” in the Nix store unless they are identical.
Special exit codes:
- `100`\
@ -121,7 +118,7 @@ Special exit codes:
- `102`\
Hash mismatch, the build output was rejected because it does not
match the [`outputHash` attribute of the
derivation](../expressions/advanced-attributes.md).
derivation](../language/advanced-attributes.md).
- `104`\
Not deterministic, the build succeeded in check mode but the
@ -140,8 +137,10 @@ or.
## Examples
This operation is typically used to build store derivations produced by
[`nix-instantiate`](nix-instantiate.md):
This operation is typically used to build [store derivation]s produced by
[`nix-instantiate`](./nix-instantiate.md):
[store derivation]: ../glossary.md#gloss-store-derivation
```console
$ nix-store -r $(nix-instantiate ./test.nix)
@ -301,7 +300,7 @@ symlink.
## Common query options
- `--use-output`; `-u`\
For each argument to the query that is a store derivation, apply the
For each argument to the query that is a [store derivation], apply the
query to the output path of the derivation instead.
- `--force-realise`; `-f`\
@ -321,7 +320,7 @@ symlink.
This query has one option:
- `--include-outputs`
Also include the existing output paths of store derivations,
Also include the existing output paths of [store derivation]s,
and their closures.
This query can be used to implement various kinds of deployment. A
@ -375,12 +374,12 @@ symlink.
Prints the references graph of the store paths *paths* in the
[GraphML](http://graphml.graphdrawing.org/) file format. This can be
used to visualise dependency graphs. To obtain a build-time
dependency graph, apply this to a store derivation. To obtain a
dependency graph, apply this to a [store derivation]. To obtain a
runtime dependency graph, apply it to an output path.
- `--binding` *name*; `-b` *name*\
Prints the value of the attribute *name* (i.e., environment
variable) of the store derivations *paths*. It is an error for a
variable) of the [store derivation]s *paths*. It is an error for a
derivation to not have the specified attribute.
- `--hash`\

46
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@ -2,13 +2,13 @@
Most Nix commands accept the following command-line options:
- `--help`\
- [`--help`]{#opt-help}\
Prints out a summary of the command syntax and exits.
- `--version`\
- [`--version`]{#opt-version}\
Prints out the Nix version number on standard output and exits.
- `--verbose` / `-v`\
- [`--verbose`]{#opt-verbose} / `-v`\
Increases the level of verbosity of diagnostic messages printed on
standard error. For each Nix operation, the information printed on
standard output is well-defined; any diagnostic information is
@ -37,14 +37,14 @@ Most Nix commands accept the following command-line options:
- 5\
“Vomit”: print vast amounts of debug information.
- `--quiet`\
- [`--quiet`]{#opt-quiet}\
Decreases the level of verbosity of diagnostic messages printed on
standard error. This is the inverse option to `-v` / `--verbose`.
This option may be specified repeatedly. See the previous verbosity
levels list.
- `--log-format` *format*\
- [`--log-format`]{#opt-log-format} *format*\
This option can be used to change the output of the log format, with
*format* being one of:
@ -66,14 +66,14 @@ Most Nix commands accept the following command-line options:
- bar-with-logs\
Display the raw logs, with the progress bar at the bottom.
- `--no-build-output` / `-Q`\
- [`--no-build-output`]{#opt-no-build-output} / `-Q`\
By default, output written by builders to standard output and
standard error is echoed to the Nix command's standard error. This
option suppresses this behaviour. Note that the builder's standard
output and error are always written to a log file in
`prefix/nix/var/log/nix`.
- `--max-jobs` / `-j` *number*\
- [`--max-jobs`]{#opt-max-jobs} / `-j` *number*\
Sets the maximum number of build jobs that Nix will perform in
parallel to the specified number. Specify `auto` to use the number
of CPUs in the system. The default is specified by the `max-jobs`
@ -83,7 +83,7 @@ Most Nix commands accept the following command-line options:
Setting it to `0` disallows building on the local machine, which is
useful when you want builds to happen only on remote builders.
- `--cores`\
- [`--cores`]{#opt-cores}\
Sets the value of the `NIX_BUILD_CORES` environment variable in
the invocation of builders. Builders can use this variable at
their discretion to control the maximum amount of parallelism. For
@ -94,18 +94,18 @@ Most Nix commands accept the following command-line options:
means that the builder should use all available CPU cores in the
system.
- `--max-silent-time`\
- [`--max-silent-time`]{#opt-max-silent-time}\
Sets the maximum number of seconds that a builder can go without
producing any data on standard output or standard error. The
default is specified by the `max-silent-time` configuration
setting. `0` means no time-out.
- `--timeout`\
- [`--timeout`]{#opt-timeout}\
Sets the maximum number of seconds that a builder can run. The
default is specified by the `timeout` configuration setting. `0`
means no timeout.
- `--keep-going` / `-k`\
- [`--keep-going`]{#opt-keep-going} / `-k`\
Keep going in case of failed builds, to the greatest extent
possible. That is, if building an input of some derivation fails,
Nix will still build the other inputs, but not the derivation
@ -113,13 +113,13 @@ Most Nix commands accept the following command-line options:
for builds of substitutes), possibly killing builds in progress (in
case of parallel or distributed builds).
- `--keep-failed` / `-K`\
- [`--keep-failed`]{#opt-keep-failed} / `-K`\
Specifies that in case of a build failure, the temporary directory
(usually in `/tmp`) in which the build takes place should not be
deleted. The path of the build directory is printed as an
informational message.
- `--fallback`\
- [`--fallback`]{#opt-fallback}\
Whenever Nix attempts to build a derivation for which substitutes
are known for each output path, but realising the output paths
through the substitutes fails, fall back on building the derivation.
@ -134,18 +134,18 @@ Most Nix commands accept the following command-line options:
failure in obtaining the substitutes to lead to a full build from
source (with the related consumption of resources).
- `--readonly-mode`\
- [`--readonly-mode`]{#opt-readonly-mode}\
When this option is used, no attempt is made to open the Nix
database. Most Nix operations do need database access, so those
operations will fail.
- `--arg` *name* *value*\
- [`--arg`]{#opt-arg} *name* *value*\
This option is accepted by `nix-env`, `nix-instantiate`,
`nix-shell` and `nix-build`. When evaluating Nix expressions, the
expression evaluator will automatically try to call functions that
it encounters. It can automatically call functions for which every
argument has a [default
value](../expressions/language-constructs.md#functions) (e.g.,
value](../language/constructs.md#functions) (e.g.,
`{ argName ? defaultValue }: ...`). With `--arg`, you can also
call functions that have arguments without a default value (or
override a default value). That is, if the evaluator encounters a
@ -164,19 +164,19 @@ Most Nix commands accept the following command-line options:
So if you call this Nix expression (e.g., when you do `nix-env -iA
pkgname`), the function will be called automatically using the
value [`builtins.currentSystem`](../expressions/builtins.md) for
value [`builtins.currentSystem`](../language/builtins.md) for
the `system` argument. You can override this using `--arg`, e.g.,
`nix-env -iA pkgname --arg system \"i686-freebsd\"`. (Note that
since the argument is a Nix string literal, you have to escape the
quotes.)
- `--argstr` *name* *value*\
- [`--argstr`]{#opt-argstr} *name* *value*\
This option is like `--arg`, only the value is not a Nix
expression but a string. So instead of `--arg system
\"i686-linux\"` (the outer quotes are to keep the shell happy) you
can say `--argstr system i686-linux`.
- `--attr` / `-A` *attrPath*\
- [`--attr`]{#opt-attr} / `-A` *attrPath*\
Select an attribute from the top-level Nix expression being
evaluated. (`nix-env`, `nix-instantiate`, `nix-build` and
`nix-shell` only.) The *attribute path* *attrPath* is a sequence
@ -191,7 +191,7 @@ Most Nix commands accept the following command-line options:
attribute of the fourth element of the array in the `foo` attribute
of the top-level expression.
- `--expr` / `-E`\
- [`--expr`]{#opt-expr} / `-E`\
Interpret the command line arguments as a list of Nix expressions to
be parsed and evaluated, rather than as a list of file names of Nix
expressions. (`nix-instantiate`, `nix-build` and `nix-shell` only.)
@ -202,17 +202,17 @@ Most Nix commands accept the following command-line options:
use, give your expression to the `nix-shell -p` convenience flag
instead.
- `-I` *path*\
- [`-I`]{#opt-I} *path*\
Add a path to the Nix expression search path. This option may be
given multiple times. See the `NIX_PATH` environment variable for
information on the semantics of the Nix search path. Paths added
through `-I` take precedence over `NIX_PATH`.
- `--option` *name* *value*\
- [`--option`]{#opt-option} *name* *value*\
Set the Nix configuration option *name* to *value*. This overrides
settings in the Nix configuration file (see nix.conf5).
- `--repair`\
- [`--repair`]{#opt-repair}\
Fix corrupted or missing store paths by redownloading or rebuilding
them. Note that this is slow because it requires computing a
cryptographic hash of the contents of every path in the closure of

181
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@ -42,7 +42,7 @@ $ nix develop
```
To get a shell with a different compilation environment (e.g. stdenv,
gccStdenv, clangStdenv, clang11Stdenv):
gccStdenv, clangStdenv, clang11Stdenv, ccacheStdenv):
```console
$ nix-shell -A devShells.x86_64-linux.clang11StdenvPackages
@ -54,6 +54,9 @@ or if you have a flake-enabled nix:
$ nix develop .#clang11StdenvPackages
```
Note: you can use `ccacheStdenv` to drastically improve rebuild
time. By default, ccache keeps artifacts in `~/.cache/ccache/`.
To build Nix itself in this shell:
```console
@ -71,18 +74,6 @@ To install it in `$(pwd)/outputs` and test it:
nix (Nix) 3.0
```
To run a functional test:
```console
make tests/test-name-should-auto-complete.sh.test
```
To run the unit-tests for C++ code:
```
make check
```
If you have a flakes-enabled Nix you can replace:
```console
@ -94,3 +85,167 @@ by:
```console
$ nix develop
```
## Running tests
### Unit-tests
The unit-tests for each Nix library (`libexpr`, `libstore`, etc..) are defined
under `src/{library_name}/tests` using the
[googletest](https://google.github.io/googletest/) framework.
You can run the whole testsuite with `make check`, or the tests for a specific component with `make libfoo-tests_RUN`. Finer-grained filtering is also possible using the [--gtest_filter](https://google.github.io/googletest/advanced.html#running-a-subset-of-the-tests) command-line option.
### Functional tests
The functional tests reside under the `tests` directory and are listed in `tests/local.mk`.
Each test is a bash script.
The whole test suite can be run with:
```shell-session
$ make install && make installcheck
ran test tests/foo.sh... [PASS]
ran test tests/bar.sh... [PASS]
...
```
Individual tests can be run with `make`:
```shell-session
$ make tests/${testName}.sh.test
ran test tests/${testName}.sh... [PASS]
```
or without `make`:
```shell-session
$ ./mk/run-test.sh tests/${testName}.sh
ran test tests/${testName}.sh... [PASS]
```
To see the complete output, one can also run:
```shell-session
$ ./mk/debug-test.sh tests/${testName}.sh
+ foo
output from foo
+ bar
output from bar
...
```
The test script will then be traced with `set -x` and the output displayed as it happens, regardless of whether the test succeeds or fails.
#### Debugging failing functional tests
When a functional test fails, it usually does so somewhere in the middle of the script.
To figure out what's wrong, it is convenient to run the test regularly up to the failing `nix` command, and then run that command with a debugger like GDB.
For example, if the script looks like:
```bash
foo
nix blah blub
bar
```
edit it like so:
```diff
foo
-nix blah blub
+gdb --args nix blah blub
bar
```
Then, running the test with `./mk/debug-test.sh` will drop you into GDB once the script reaches that point:
```shell-session
$ ./mk/debug-test.sh tests/${testName}.sh
...
+ gdb blash blub
GNU gdb (GDB) 12.1
...
(gdb)
```
One can debug the Nix invocation in all the usual ways.
For example, enter `run` to start the Nix invocation.
### Integration tests
The integration tests are defined in the Nix flake under the `hydraJobs.tests` attribute.
These tests include everything that needs to interact with external services or run Nix in a non-trivial distributed setup.
Because these tests are expensive and require more than what the standard github-actions setup provides, they only run on the master branch (on <https://hydra.nixos.org/jobset/nix/master>).
You can run them manually with `nix build .#hydraJobs.tests.{testName}` or `nix-build -A hydraJobs.tests.{testName}`
### Installer tests
After a one-time setup, the Nix repository's GitHub Actions continuous integration (CI) workflow can test the installer each time you push to a branch.
Creating a Cachix cache for your installer tests and adding its authorization token to GitHub enables [two installer-specific jobs in the CI workflow](https://github.com/NixOS/nix/blob/88a45d6149c0e304f6eb2efcc2d7a4d0d569f8af/.github/workflows/ci.yml#L50-L91):
- The `installer` job generates installers for the platforms below and uploads them to your Cachix cache:
- `x86_64-linux`
- `armv6l-linux`
- `armv7l-linux`
- `x86_64-darwin`
- The `installer_test` job (which runs on `ubuntu-latest` and `macos-latest`) will try to install Nix with the cached installer and run a trivial Nix command.
#### One-time setup
1. Have a GitHub account with a fork of the [Nix repository](https://github.com/NixOS/nix).
2. At cachix.org:
- Create or log in to an account.
- Create a Cachix cache using the format `<github-username>-nix-install-tests`.
- Navigate to the new cache > Settings > Auth Tokens.
- Generate a new Cachix auth token and copy the generated value.
3. At github.com:
- Navigate to your Nix fork > Settings > Secrets > Actions > New repository secret.
- Name the secret `CACHIX_AUTH_TOKEN`.
- Paste the copied value of the Cachix cache auth token.
#### Using the CI-generated installer for manual testing
After the CI run completes, you can check the output to extract the installer URL:
1. Click into the detailed view of the CI run.
2. Click into any `installer_test` run (the URL you're here to extract will be the same in all of them).
3. Click into the `Run cachix/install-nix-action@v...` step and click the detail triangle next to the first log line (it will also be `Run cachix/install-nix-action@v...`)
4. Copy the value of `install_url`
5. To generate an install command, plug this `install_url` and your GitHub username into this template:
```console
sh <(curl -L <install_url>) --tarball-url-prefix https://<github-username>-nix-install-tests.cachix.org/serve
```
<!-- #### Manually generating test installers
There's obviously a manual way to do this, and it's still the only way for
platforms that lack GA runners.
I did do this back in Fall 2020 (before the GA approach encouraged here). I'll
sketch what I recall in case it encourages someone to fill in detail, but: I
didn't know what I was doing at the time and had to fumble/ask around a lot--
so I don't want to uphold any of it as "right". It may have been dumb or
the _hard_ way from the getgo. Fundamentals may have changed since.
Here's the build command I used to do this on and for x86_64-darwin:
nix build --out-link /tmp/foo ".#checks.x86_64-darwin.binaryTarball"
I used the stable out-link to make it easier to script the next steps:
link=$(readlink /tmp/foo)
cp $link/*-darwin.tar.xz ~/somewheres
I've lost the last steps and am just going from memory:
From here, I think I had to extract and modify the `install` script to point
it at this tarball (which I scped to my own site, but it might make more sense
to just share them locally). I extracted this script once and then just
search/replaced in it for each new build.
The installer now supports a `--tarball-url-prefix` flag which _may_ have
solved this need?
-->

80
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@ -1,80 +0,0 @@
# Arguments and Variables
The [Nix expression for GNU Hello](expression-syntax.md) is a
function; it is missing some arguments that have to be filled in
somewhere. In the Nix Packages collection this is done in the file
`pkgs/top-level/all-packages.nix`, where all Nix expressions for
packages are imported and called with the appropriate arguments. Here
are some fragments of `all-packages.nix`, with annotations of what
they mean:
```nix
...
rec { ①
hello = import ../applications/misc/hello/ex-1 ② { ③
inherit fetchurl stdenv perl;
};
perl = import ../development/interpreters/perl { ④
inherit fetchurl stdenv;
};
fetchurl = import ../build-support/fetchurl {
inherit stdenv; ...
};
stdenv = ...;
}
```
1. This file defines a set of attributes, all of which are concrete
derivations (i.e., not functions). In fact, we define a *mutually
recursive* set of attributes. That is, the attributes can refer to
each other. This is precisely what we want since we want to “plug”
the various packages into each other.
2. Here we *import* the Nix expression for GNU Hello. The import
operation just loads and returns the specified Nix expression. In
fact, we could just have put the contents of the Nix expression
for GNU Hello in `all-packages.nix` at this point. That would be
completely equivalent, but it would make `all-packages.nix` rather
bulky.
Note that we refer to `../applications/misc/hello/ex-1`, not
`../applications/misc/hello/ex-1/default.nix`. When you try to
import a directory, Nix automatically appends `/default.nix` to the
file name.
3. This is where the actual composition takes place. Here we *call* the
function imported from `../applications/misc/hello/ex-1` with a set
containing the things that the function expects, namely `fetchurl`,
`stdenv`, and `perl`. We use inherit again to use the attributes
defined in the surrounding scope (we could also have written
`fetchurl = fetchurl;`, etc.).
The result of this function call is an actual derivation that can be
built by Nix (since when we fill in the arguments of the function,
what we get is its body, which is the call to `stdenv.mkDerivation`
in the [Nix expression for GNU Hello](expression-syntax.md)).
> **Note**
>
> Nixpkgs has a convenience function `callPackage` that imports and
> calls a function, filling in any missing arguments by passing the
> corresponding attribute from the Nixpkgs set, like this:
>
> ```nix
> hello = callPackage ../applications/misc/hello/ex-1 { };
> ```
>
> If necessary, you can set or override arguments:
>
> ```nix
> hello = callPackage ../applications/misc/hello/ex-1 { stdenv = myStdenv; };
> ```
4. Likewise, we have to instantiate Perl, `fetchurl`, and the standard
environment.

70
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@ -1,70 +0,0 @@
# Build Script
Here is the builder referenced from Hello's Nix expression (stored in
`pkgs/applications/misc/hello/ex-1/builder.sh`):
```bash
source $stdenv/setup ①
PATH=$perl/bin:$PATH ②
tar xvfz $src ③
cd hello-*
./configure --prefix=$out ④
make ⑤
make install
```
The builder can actually be made a lot shorter by using the *generic
builder* functions provided by `stdenv`, but here we write out the build
steps to elucidate what a builder does. It performs the following steps:
1. When Nix runs a builder, it initially completely clears the
environment (except for the attributes declared in the derivation).
This is done to prevent undeclared inputs from being used in the
build process. If for example the `PATH` contained `/usr/bin`, then
you might accidentally use `/usr/bin/gcc`.
So the first step is to set up the environment. This is done by
calling the `setup` script of the standard environment. The
environment variable `stdenv` points to the location of the
standard environment being used. (It wasn't specified explicitly
as an attribute in Hello's Nix expression, but `mkDerivation` adds
it automatically.)
2. Since Hello needs Perl, we have to make sure that Perl is in the
`PATH`. The `perl` environment variable points to the location of
the Perl package (since it was passed in as an attribute to the
derivation), so `$perl/bin` is the directory containing the Perl
interpreter.
3. Now we have to unpack the sources. The `src` attribute was bound to
the result of fetching the Hello source tarball from the network, so
the `src` environment variable points to the location in the Nix
store to which the tarball was downloaded. After unpacking, we `cd`
to the resulting source directory.
The whole build is performed in a temporary directory created in
`/tmp`, by the way. This directory is removed after the builder
finishes, so there is no need to clean up the sources afterwards.
Also, the temporary directory is always newly created, so you don't
have to worry about files from previous builds interfering with the
current build.
4. GNU Hello is a typical Autoconf-based package, so we first have to
run its `configure` script. In Nix every package is stored in a
separate location in the Nix store, for instance
`/nix/store/9a54ba97fb71b65fda531012d0443ce2-hello-2.1.1`. Nix
computes this path by cryptographically hashing all attributes of
the derivation. The path is passed to the builder through the `out`
environment variable. So here we give `configure` the parameter
`--prefix=$out` to cause Hello to be installed in the expected
location.
5. Finally we build Hello (`make`) and install it into the location
specified by `out` (`make install`).
If you are wondering about the absence of error checking on the result
of various commands called in the builder: this is because the shell
script is evaluated with Bash's `-e` option, which causes the script to
be aborted if any command fails without an error check.

12
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@ -1,12 +0,0 @@
# Nix Expression Language
The Nix expression language is a pure, lazy, functional language. Purity
means that operations in the language don't have side-effects (for
instance, there is no variable assignment). Laziness means that
arguments to functions are evaluated only when they are needed.
Functional means that functions are “normal” values that can be passed
around and manipulated in interesting ways. The language is not a
full-featured, general purpose language. Its main job is to describe
packages, compositions of packages, and the variability within packages.
This section presents the various features of the language.

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@ -1,93 +0,0 @@
# Expression Syntax
Here is a Nix expression for GNU Hello:
```nix
{ stdenv, fetchurl, perl }: ①
stdenv.mkDerivation { ②
name = "hello-2.1.1"; ③
builder = ./builder.sh; ④
src = fetchurl { ⑤
url = "ftp://ftp.nluug.nl/pub/gnu/hello/hello-2.1.1.tar.gz";
sha256 = "1md7jsfd8pa45z73bz1kszpp01yw6x5ljkjk2hx7wl800any6465";
};
inherit perl; ⑥
}
```
This file is actually already in the Nix Packages collection in
`pkgs/applications/misc/hello/ex-1/default.nix`. It is customary to
place each package in a separate directory and call the single Nix
expression in that directory `default.nix`. The file has the following
elements (referenced from the figure by number):
1. This states that the expression is a *function* that expects to be
called with three arguments: `stdenv`, `fetchurl`, and `perl`. They
are needed to build Hello, but we don't know how to build them here;
that's why they are function arguments. `stdenv` is a package that
is used by almost all Nix Packages; it provides a
“standard” environment consisting of the things you would expect
in a basic Unix environment: a C/C++ compiler (GCC, to be precise),
the Bash shell, fundamental Unix tools such as `cp`, `grep`, `tar`,
etc. `fetchurl` is a function that downloads files. `perl` is the
Perl interpreter.
Nix functions generally have the form `{ x, y, ..., z }: e` where
`x`, `y`, etc. are the names of the expected arguments, and where
*e* is the body of the function. So here, the entire remainder of
the file is the body of the function; when given the required
arguments, the body should describe how to build an instance of
the Hello package.
2. So we have to build a package. Building something from other stuff
is called a *derivation* in Nix (as opposed to sources, which are
built by humans instead of computers). We perform a derivation by
calling `stdenv.mkDerivation`. `mkDerivation` is a function
provided by `stdenv` that builds a package from a set of
*attributes*. A set is just a list of key/value pairs where each
key is a string and each value is an arbitrary Nix
expression. They take the general form `{ name1 = expr1; ...
nameN = exprN; }`.
3. The attribute `name` specifies the symbolic name and version of
the package. Nix doesn't really care about these things, but they
are used by for instance `nix-env -q` to show a “human-readable”
name for packages. This attribute is required by `mkDerivation`.
4. The attribute `builder` specifies the builder. This attribute can
sometimes be omitted, in which case `mkDerivation` will fill in a
default builder (which does a `configure; make; make install`, in
essence). Hello is sufficiently simple that the default builder
would suffice, but in this case, we will show an actual builder
for educational purposes. The value `./builder.sh` refers to the
shell script shown in the [next section](build-script.md),
discussed below.
5. The builder has to know what the sources of the package are. Here,
the attribute `src` is bound to the result of a call to the
`fetchurl` function. Given a URL and a SHA-256 hash of the expected
contents of the file at that URL, this function builds a derivation
that downloads the file and checks its hash. So the sources are a
dependency that like all other dependencies is built before Hello
itself is built.
Instead of `src` any other name could have been used, and in fact
there can be any number of sources (bound to different attributes).
However, `src` is customary, and it's also expected by the default
builder (which we don't use in this example).
6. Since the derivation requires Perl, we have to pass the value of the
`perl` function argument to the builder. All attributes in the set
are actually passed as environment variables to the builder, so
declaring an attribute
```nix
perl = perl;
```
will do the trick: it binds an attribute `perl` to the function
argument which also happens to be called `perl`. However, it looks a
bit silly, so there is a shorter syntax. The `inherit` keyword
causes the specified attributes to be bound to whatever variables
with the same name happen to be in scope.

66
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@ -1,66 +0,0 @@
# Generic Builder Syntax
Recall that the [build script for GNU Hello](build-script.md) looked
something like this:
```bash
PATH=$perl/bin:$PATH
tar xvfz $src
cd hello-*
./configure --prefix=$out
make
make install
```
The builders for almost all Unix packages look like this — set up some
environment variables, unpack the sources, configure, build, and
install. For this reason the standard environment provides some Bash
functions that automate the build process. Here is what a builder using
the generic build facilities looks like:
```bash
buildInputs="$perl" ①
source $stdenv/setup ②
genericBuild ③
```
Here is what each line means:
1. The `buildInputs` variable tells `setup` to use the indicated
packages as “inputs”. This means that if a package provides a `bin`
subdirectory, it's added to `PATH`; if it has a `include`
subdirectory, it's added to GCC's header search path; and so on.
(This is implemented in a modular way: `setup` tries to source the
file `pkg/nix-support/setup-hook` of all dependencies. These “setup
hooks” can then set up whatever environment variables they want; for
instance, the setup hook for Perl sets the `PERL5LIB` environment
variable to contain the `lib/site_perl` directories of all inputs.)
2. The function `genericBuild` is defined in the file `$stdenv/setup`.
3. The final step calls the shell function `genericBuild`, which
performs the steps that were done explicitly in the previous build
script. The generic builder is smart enough to figure out whether
to unpack the sources using `gzip`, `bzip2`, etc. It can be
customised in many ways; see the Nixpkgs manual for details.
Discerning readers will note that the `buildInputs` could just as well
have been set in the Nix expression, like this:
```nix
buildInputs = [ perl ];
```
The `perl` attribute can then be removed, and the builder becomes even
shorter:
```bash
source $stdenv/setup
genericBuild
```
In fact, `mkDerivation` provides a default builder that looks exactly
like that, so it is actually possible to omit the builder for Hello
entirely.

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@ -1,28 +0,0 @@
# Operators
The table below lists the operators in the Nix expression language, in
order of precedence (from strongest to weakest binding).
| Name | Syntax | Associativity | Description | Precedence |
| ------------------------ | ----------------------------------- | ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------- |
| Select | *e* `.` *attrpath* \[ `or` *def* \] | none | Select attribute denoted by the attribute path *attrpath* from set *e*. (An attribute path is a dot-separated list of attribute names.) If the attribute doesn’t exist, return *def* if provided, otherwise abort evaluation. | 1 |
| Application | *e1* *e2* | left | Call function *e1* with argument *e2*. | 2 |
| Arithmetic Negation | `-` *e* | none | Arithmetic negation. | 3 |
| Has Attribute | *e* `?` *attrpath* | none | Test whether set *e* contains the attribute denoted by *attrpath*; return `true` or `false`. | 4 |
| List Concatenation | *e1* `++` *e2* | right | List concatenation. | 5 |
| Multiplication | *e1* `*` *e2*, | left | Arithmetic multiplication. | 6 |
| Division | *e1* `/` *e2* | left | Arithmetic division. | 6 |
| Addition | *e1* `+` *e2* | left | Arithmetic addition. | 7 |
| Subtraction | *e1* `-` *e2* | left | Arithmetic subtraction. | 7 |
| String Concatenation | *string1* `+` *string2* | left | String concatenation. | 7 |
| Not | `!` *e* | none | Boolean negation. | 8 |
| Update | *e1* `//` *e2* | right | Return a set consisting of the attributes in *e1* and *e2* (with the latter taking precedence over the former in case of equally named attributes). | 9 |
| Less Than | *e1* `<` *e2*, | none | Arithmetic/lexicographic comparison. | 10 |
| Less Than or Equal To | *e1* `<=` *e2* | none | Arithmetic/lexicographic comparison. | 10 |
| Greater Than | *e1* `>` *e2* | none | Arithmetic/lexicographic comparison. | 10 |
| Greater Than or Equal To | *e1* `>=` *e2* | none | Arithmetic/lexicographic comparison. | 10 |
| Equality | *e1* `==` *e2* | none | Equality. | 11 |
| Inequality | *e1* `!=` *e2* | none | Inequality. | 11 |
| Logical AND | *e1* `&&` *e2* | left | Logical AND. | 12 |
| Logical OR | *e1* <code>&#124;&#124;</code> *e2* | left | Logical OR. | 13 |
| Logical Implication | *e1* `->` *e2* | none | Logical implication (equivalent to <code>!e1 &#124;&#124; e2</code>). | 14 |

251
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@ -1,251 +0,0 @@
# Values
## Simple Values
Nix has the following basic data types:
- *Strings* can be written in three ways.
The most common way is to enclose the string between double quotes,
e.g., `"foo bar"`. Strings can span multiple lines. The special
characters `"` and `\` and the character sequence `${` must be
escaped by prefixing them with a backslash (`\`). Newlines, carriage
returns and tabs can be written as `\n`, `\r` and `\t`,
respectively.
You can include the result of an expression into a string by
enclosing it in `${...}`, a feature known as *antiquotation*. The
enclosed expression must evaluate to something that can be coerced
into a string (meaning that it must be a string, a path, or a
derivation). For instance, rather than writing
```nix
"--with-freetype2-library=" + freetype + "/lib"
```
(where `freetype` is a derivation), you can instead write the more
natural
```nix
"--with-freetype2-library=${freetype}/lib"
```
The latter is automatically translated to the former. A more
complicated example (from the Nix expression for
[Qt](http://www.trolltech.com/products/qt)):
```nix
configureFlags = "
-system-zlib -system-libpng -system-libjpeg
${if openglSupport then "-dlopen-opengl
-L${mesa}/lib -I${mesa}/include
-L${libXmu}/lib -I${libXmu}/include" else ""}
${if threadSupport then "-thread" else "-no-thread"}
";
```
Note that Nix expressions and strings can be arbitrarily nested; in
this case the outer string contains various antiquotations that
themselves contain strings (e.g., `"-thread"`), some of which in
turn contain expressions (e.g., `${mesa}`).
The second way to write string literals is as an *indented string*,
which is enclosed between pairs of *double single-quotes*, like so:
```nix
''
This is the first line.
This is the second line.
This is the third line.
''
```
This kind of string literal intelligently strips indentation from
the start of each line. To be precise, it strips from each line a
number of spaces equal to the minimal indentation of the string as a
whole (disregarding the indentation of empty lines). For instance,
the first and second line are indented two spaces, while the third
line is indented four spaces. Thus, two spaces are stripped from
each line, so the resulting string is
```nix
"This is the first line.\nThis is the second line.\n This is the third line.\n"
```
Note that the whitespace and newline following the opening `''` is
ignored if there is no non-whitespace text on the initial line.
Antiquotation (`${expr}`) is supported in indented strings.
Since `${` and `''` have special meaning in indented strings, you
need a way to quote them. `$` can be escaped by prefixing it with
`''` (that is, two single quotes), i.e., `''$`. `''` can be escaped
by prefixing it with `'`, i.e., `'''`. `$` removes any special
meaning from the following `$`. Linefeed, carriage-return and tab
characters can be written as `''\n`, `''\r`, `''\t`, and `''\`
escapes any other character.
Indented strings are primarily useful in that they allow multi-line
string literals to follow the indentation of the enclosing Nix
expression, and that less escaping is typically necessary for
strings representing languages such as shell scripts and
configuration files because `''` is much less common than `"`.
Example:
```nix
stdenv.mkDerivation {
...
postInstall =
''
mkdir $out/bin $out/etc
cp foo $out/bin
echo "Hello World" > $out/etc/foo.conf
${if enableBar then "cp bar $out/bin" else ""}
'';
...
}
```
Finally, as a convenience, *URIs* as defined in appendix B of
[RFC 2396](http://www.ietf.org/rfc/rfc2396.txt) can be written *as
is*, without quotes. For instance, the string
`"http://example.org/foo.tar.bz2"` can also be written as
`http://example.org/foo.tar.bz2`.
- Numbers, which can be *integers* (like `123`) or *floating point*
(like `123.43` or `.27e13`).
Numbers are type-compatible: pure integer operations will always
return integers, whereas any operation involving at least one
floating point number will have a floating point number as a result.
- *Paths*, e.g., `/bin/sh` or `./builder.sh`. A path must contain at
least one slash to be recognised as such. For instance, `builder.sh`
is not a path: it's parsed as an expression that selects the
attribute `sh` from the variable `builder`. If the file name is
relative, i.e., if it does not begin with a slash, it is made
absolute at parse time relative to the directory of the Nix
expression that contained it. For instance, if a Nix expression in
`/foo/bar/bla.nix` refers to `../xyzzy/fnord.nix`, the absolute path
is `/foo/xyzzy/fnord.nix`.
If the first component of a path is a `~`, it is interpreted as if
the rest of the path were relative to the user's home directory.
e.g. `~/foo` would be equivalent to `/home/edolstra/foo` for a user
whose home directory is `/home/edolstra`.
Paths can also be specified between angle brackets, e.g.
`<nixpkgs>`. This means that the directories listed in the
environment variable `NIX_PATH` will be searched for the given file
or directory name.
Antiquotation is supported in any paths except those in angle brackets.
`./${foo}-${bar}.nix` is a more convenient way of writing
`./. + "/" + foo + "-" + bar + ".nix"` or `./. + "/${foo}-${bar}.nix"`. At
least one slash must appear *before* any antiquotations for this to be
recognized as a path. `a.${foo}/b.${bar}` is a syntactically valid division
operation. `./a.${foo}/b.${bar}` is a path.
- *Booleans* with values `true` and `false`.
- The null value, denoted as `null`.
## Lists
Lists are formed by enclosing a whitespace-separated list of values
between square brackets. For example,
```nix
[ 123 ./foo.nix "abc" (f { x = y; }) ]
```
defines a list of four elements, the last being the result of a call to
the function `f`. Note that function calls have to be enclosed in
parentheses. If they had been omitted, e.g.,
```nix
[ 123 ./foo.nix "abc" f { x = y; } ]
```
the result would be a list of five elements, the fourth one being a
function and the fifth being a set.
Note that lists are only lazy in values, and they are strict in length.
## Sets
Sets are really the core of the language, since ultimately the Nix
language is all about creating derivations, which are really just sets
of attributes to be passed to build scripts.
Sets are just a list of name/value pairs (called *attributes*) enclosed
in curly brackets, where each value is an arbitrary expression
terminated by a semicolon. For example:
```nix
{ x = 123;
text = "Hello";
y = f { bla = 456; };
}
```
This defines a set with attributes named `x`, `text`, `y`. The order of
the attributes is irrelevant. An attribute name may only occur once.
Attributes can be selected from a set using the `.` operator. For
instance,
```nix
{ a = "Foo"; b = "Bar"; }.a
```
evaluates to `"Foo"`. It is possible to provide a default value in an
attribute selection using the `or` keyword. For example,
```nix
{ a = "Foo"; b = "Bar"; }.c or "Xyzzy"
```
will evaluate to `"Xyzzy"` because there is no `c` attribute in the set.
You can use arbitrary double-quoted strings as attribute names:
```nix
{ "foo ${bar}" = 123; "nix-1.0" = 456; }."foo ${bar}"
```
This will evaluate to `123` (Assuming `bar` is antiquotable). In the
case where an attribute name is just a single antiquotation, the quotes
can be dropped:
```nix
{ foo = 123; }.${bar} or 456
```
This will evaluate to `123` if `bar` evaluates to `"foo"` when coerced
to a string and `456` otherwise (again assuming `bar` is antiquotable).
In the special case where an attribute name inside of a set declaration
evaluates to `null` (which is normally an error, as `null` is not
antiquotable), that attribute is simply not added to the set:
```nix
{ ${if foo then "bar" else null} = true; }
```
This will evaluate to `{}` if `foo` evaluates to `false`.
A set that has a `__functor` attribute whose value is callable (i.e. is
itself a function or a set with a `__functor` attribute whose value is
callable) can be applied as if it were a function, with the set itself
passed in first , e.g.,
```nix
let add = { __functor = self: x: x + self.x; };
inc = add // { x = 1; };
in inc 1
```
evaluates to `2`. This can be used to attach metadata to a function
without the caller needing to treat it specially, or to implement a form
of object-oriented programming, for example.

61
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@ -1,61 +0,0 @@
# Building and Testing
You can now try to build Hello. Of course, you could do `nix-env -f . -iA
hello`, but you may not want to install a possibly broken package just
yet. The best way to test the package is by using the command
`nix-build`, which builds a Nix expression and creates a symlink named
`result` in the current directory:
```console
$ nix-build -A hello
building path `/nix/store/632d2b22514d...-hello-2.1.1'
hello-2.1.1/
hello-2.1.1/intl/
hello-2.1.1/intl/ChangeLog
...
$ ls -l result
lrwxrwxrwx ... 2006-09-29 10:43 result -> /nix/store/632d2b22514d...-hello-2.1.1
$ ./result/bin/hello
Hello, world!
```
The `-A` option selects the `hello` attribute. This is faster than
using the symbolic package name specified by the `name` attribute
(which also happens to be `hello`) and is unambiguous (there can be
multiple packages with the symbolic name `hello`, but there can be
only one attribute in a set named `hello`).
`nix-build` registers the `./result` symlink as a garbage collection
root, so unless and until you delete the `./result` symlink, the output
of the build will be safely kept on your system. You can use
`nix-build`’s `-o` switch to give the symlink another name.
Nix has transactional semantics. Once a build finishes successfully, Nix
makes a note of this in its database: it registers that the path denoted
by `out` is now “valid”. If you try to build the derivation again, Nix
will see that the path is already valid and finish immediately. If a
build fails, either because it returns a non-zero exit code, because Nix
or the builder are killed, or because the machine crashes, then the
output paths will not be registered as valid. If you try to build the
derivation again, Nix will remove the output paths if they exist (e.g.,
because the builder died half-way through `make
install`) and try again. Note that there is no “negative caching”: Nix
doesn't remember that a build failed, and so a failed build can always
be repeated. This is because Nix cannot distinguish between permanent
failures (e.g., a compiler error due to a syntax error in the source)
and transient failures (e.g., a disk full condition).
Nix also performs locking. If you run multiple Nix builds
simultaneously, and they try to build the same derivation, the first Nix
instance that gets there will perform the build, while the others block
(or perform other derivations if available) until the build finishes:
```console
$ nix-build -A hello
waiting for lock on `/nix/store/0h5b7hp8d4hqfrw8igvx97x1xawrjnac-hello-2.1.1x'
```
So it is always safe to run multiple instances of Nix in parallel (which
isn’t the case with, say, `make`).

23
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@ -1,23 +0,0 @@
# A Simple Nix Expression
This section shows how to add and test the [GNU Hello
package](http://www.gnu.org/software/hello/hello.html) to the Nix
Packages collection. Hello is a program that prints out the text “Hello,
world\!”.
To add a package to the Nix Packages collection, you generally need to
do three things:
1. Write a Nix expression for the package. This is a file that
describes all the inputs involved in building the package, such as
dependencies, sources, and so on.
2. Write a *builder*. This is a shell script that builds the package
from the inputs. (In fact, it can be written in any language, but
typically it's a `bash` shell script.)
3. Add the package to the file `pkgs/top-level/all-packages.nix`. The
Nix expression written in the first step is a *function*; it
requires other packages in order to build it. In this step you put
it all together, i.e., you call the function with the right
arguments to build the actual package.

12
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@ -1,12 +0,0 @@
This chapter shows you how to write Nix expressions, which instruct Nix
how to build packages. It starts with a simple example (a Nix expression
for GNU Hello), and then moves on to a more in-depth look at the Nix
expression language.
> **Note**
>
> This chapter is mostly about the Nix expression language. For more
> extensive information on adding packages to the Nix Packages
> collection (such as functions in the standard environment and coding
> conventions), please consult [its
> manual](http://nixos.org/nixpkgs/manual/).

135
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@ -1,48 +1,120 @@
# Glossary
- derivation\
A description of a build action. The result of a derivation is a
- [derivation]{#gloss-derivation}\
A description of a build task. The result of a derivation is a
store object. Derivations are typically specified in Nix expressions
using the [`derivation` primitive](expressions/derivations.md). These are
using the [`derivation` primitive](./language/derivations.md). These are
translated into low-level *store derivations* (implicitly by
`nix-env` and `nix-build`, or explicitly by `nix-instantiate`).
- store\
[derivation]: #gloss-derivation
- [store derivation]{#gloss-store-derivation}\
A [derivation] represented as a `.drv` file in the [store].
It has a [store path], like any [store object].
Example: `/nix/store/g946hcz4c8mdvq2g8vxx42z51qb71rvp-git-2.38.1.drv`
See [`nix show-derivation`](./command-ref/new-cli/nix3-show-derivation.md) (experimental) for displaying the contents of store derivations.
[store derivation]: #gloss-store-derivation
- [content-addressed derivation]{#gloss-content-addressed-derivation}\
A derivation which has the
[`__contentAddressed`](./language/advanced-attributes.md#adv-attr-__contentAddressed)
attribute set to `true`.
- [fixed-output derivation]{#gloss-fixed-output-derivation}\
A derivation which includes the
[`outputHash`](./language/advanced-attributes.md#adv-attr-outputHash) attribute.
- [store]{#gloss-store}\
The location in the file system where store objects live. Typically
`/nix/store`.
- store path\
The location in the file system of a store object, i.e., an
From the perspective of the location where Nix is
invoked, the Nix store can be referred to
as a "_local_" or a "_remote_" one:
+ A *local store* exists on the filesystem of
the machine where Nix is invoked. You can use other
local stores by passing the `--store` flag to the
`nix` command. Local stores can be used for building derivations.
+ A *remote store* exists anywhere other than the
local filesystem. One example is the `/nix/store`
directory on another machine, accessed via `ssh` or
served by the `nix-serve` Perl script.
[store]: #gloss-store
- [chroot store]{#gloss-chroot-store}\
A local store whose canonical path is anything other than `/nix/store`.
- [binary cache]{#gloss-binary-cache}\
A *binary cache* is a Nix store which uses a different format: its
metadata and signatures are kept in `.narinfo` files rather than in a
Nix database. This different format simplifies serving store objects
over the network, but cannot host builds. Examples of binary caches
include S3 buckets and the [NixOS binary
cache](https://cache.nixos.org).
- [store path]{#gloss-store-path}\
The location of a [store object] in the file system, i.e., an
immediate child of the Nix store directory.
- store object\
Example: `/nix/store/a040m110amc4h71lds2jmr8qrkj2jhxd-git-2.38.1`
[store path]: #gloss-store-path
- [store object]{#gloss-store-object}\
A file that is an immediate child of the Nix store directory. These
can be regular files, but also entire directory trees. Store objects
can be sources (objects copied from outside of the store),
derivation outputs (objects produced by running a build action), or
derivations (files describing a build action).
derivation outputs (objects produced by running a build task), or
derivations (files describing a build task).
- substitute\
[store object]: #gloss-store-object
- [input-addressed store object]{#gloss-input-addressed-store-object}\
A store object produced by building a
non-[content-addressed](#gloss-content-addressed-derivation),
non-[fixed-output](#gloss-fixed-output-derivation)
derivation.
- [output-addressed store object]{#gloss-output-addressed-store-object}\
A store object whose store path hashes its content. This
includes derivations, the outputs of
[content-addressed derivations](#gloss-content-addressed-derivation),
and the outputs of
[fixed-output derivations](#gloss-fixed-output-derivation).
- [substitute]{#gloss-substitute}\
A substitute is a command invocation stored in the Nix database that
describes how to build a store object, bypassing the normal build
mechanism (i.e., derivations). Typically, the substitute builds the
store object by downloading a pre-built version of the store object
from some server.
- purity\
- [substituter]{#gloss-substituter}\
A *substituter* is an additional store from which Nix will
copy store objects it doesn't have. For details, see the
[`substituters` option](./command-ref/conf-file.md#conf-substituters).
- [purity]{#gloss-purity}\
The assumption that equal Nix derivations when run always produce
the same output. This cannot be guaranteed in general (e.g., a
builder can rely on external inputs such as the network or the
system time) but the Nix model assumes it.
- Nix expression\
- [Nix expression]{#gloss-nix-expression}\
A high-level description of software packages and compositions
thereof. Deploying software using Nix entails writing Nix
expressions for your packages. Nix expressions are translated to
derivations that are stored in the Nix store. These derivations can
then be built.
- reference\
- [reference]{#gloss-reference}\
A store path `P` is said to have a reference to a store path `Q` if
the store object at `P` contains the path `Q` somewhere. The
*references* of a store path are the set of store paths to which it
@ -52,11 +124,11 @@
output paths), whereas an output path only references other output
paths.
- reachable\
- [reachable]{#gloss-reachable}\
A store path `Q` is reachable from another store path `P` if `Q`
is in the *closure* of the *references* relation.
- closure\
- [closure]{#gloss-closure}\
The closure of a store path is the set of store paths that are
directly or indirectly “reachable” from that store path; that is,
it’s the closure of the path under the *references* relation. For
@ -71,34 +143,47 @@
to path `Q`, then `Q` is in the closure of `P`. Further, if `Q`
references `R` then `R` is also in the closure of `P`.
- output path\
A store path produced by a derivation.
- [output path]{#gloss-output-path}\
A [store path] produced by a [derivation].
- deriver\
[output path]: #gloss-output-path
- [deriver]{#gloss-deriver}\
The deriver of an *output path* is the store
derivation that built it.
- validity\
- [validity]{#gloss-validity}\
A store path is considered *valid* if it exists in the file system,
is listed in the Nix database as being valid, and if all paths in
its closure are also valid.
- user environment\
- [user environment]{#gloss-user-env}\
An automatically generated store object that consists of a set of
symlinks to “active” applications, i.e., other store paths. These
are generated automatically by
[`nix-env`](command-ref/nix-env.md). See *profiles*.
[`nix-env`](./command-ref/nix-env.md). See *profiles*.
- profile\
- [profile]{#gloss-profile}\
A symlink to the current *user environment* of a user, e.g.,
`/nix/var/nix/profiles/default`.
- NAR\
- [NAR]{#gloss-nar}\
A *N*ix *AR*chive. This is a serialisation of a path in the Nix
store. It can contain regular files, directories and symbolic
links. NARs are generated and unpacked using `nix-store --dump`
and `nix-store --restore`.
- `∅` \
- [`∅`]{#gloss-emtpy-set}\
The empty set symbol. In the context of profile history, this denotes a package is not present in a particular version of the profile.
- `ε` \
- [`ε`]{#gloss-epsilon}\
The epsilon symbol. In the context of a package, this means the version is empty. More precisely, the derivation does not have a version attribute.
- [string interpolation]{#gloss-string-interpolation}\
Expanding expressions enclosed in `${ }` within a [string], [path], or [attribute name].
See [String interpolation](./language/string-interpolation.md) for details.
[string]: ./language/values.md#type-string
[path]: ./language/values.md#type-path
[attribute name]: ./language/values.md#attribute-set

87
doc/manual/src/installation/installing-binary.md
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@ -13,7 +13,7 @@ for your platform:
- multi-user on macOS
> **Notes on read-only filesystem root in macOS 10.15 Catalina +**
>
>
> - It took some time to support this cleanly. You may see posts,
> examples, and tutorials using obsolete workarounds.
> - Supporting it cleanly made macOS installs too complex to qualify
@ -31,8 +31,8 @@ $ sh <(curl -L https://nixos.org/nix/install) --no-daemon
```
This will perform a single-user installation of Nix, meaning that `/nix`
is owned by the invoking user. You should run this under your usual user
account, *not* as root. The script will invoke `sudo` to create `/nix`
is owned by the invoking user. You can run this under your usual user
account or root. The script will invoke `sudo` to create `/nix`
if it doesn’t already exist. If you don’t have `sudo`, you should
manually create `/nix` first as root, e.g.:
@ -71,11 +71,11 @@ $ sh <(curl -L https://nixos.org/nix/install) --daemon
The multi-user installation of Nix will create build users between the
user IDs 30001 and 30032, and a group with the group ID 30000. You
should run this under your usual user account, *not* as root. The script
can run this under your usual user account or root. The script
will invoke `sudo` as needed.
> **Note**
>
>
> If you need Nix to use a different group ID or user ID set, you will
> have to download the tarball manually and [edit the install
> script](#installing-from-a-binary-tarball).
@ -88,19 +88,51 @@ extension. The installer will also create `/etc/profile.d/nix.sh`.
### Linux
```console
sudo rm -rf /etc/profile/nix.sh /etc/nix /nix ~root/.nix-profile ~root/.nix-defexpr ~root/.nix-channels ~/.nix-profile ~/.nix-defexpr ~/.nix-channels
If you are on Linux with systemd:
# If you are on Linux with systemd, you will need to run:
sudo systemctl stop nix-daemon.socket
sudo systemctl stop nix-daemon.service
sudo systemctl disable nix-daemon.socket
sudo systemctl disable nix-daemon.service
sudo systemctl daemon-reload
1. Remove the Nix daemon service:
```console
sudo systemctl stop nix-daemon.service
sudo systemctl disable nix-daemon.socket nix-daemon.service
sudo systemctl daemon-reload
```
1. Remove systemd service files:
```console
sudo rm /etc/systemd/system/nix-daemon.service /etc/systemd/system/nix-daemon.socket
```
1. The installer script uses systemd-tmpfiles to create the socket directory.
You may also want to remove the configuration for that:
```console
sudo rm /etc/tmpfiles.d/nix-daemon.conf
```
Remove files created by Nix:
```console
sudo rm -rf /nix /etc/nix /etc/profile/nix.sh ~root/.nix-profile ~root/.nix-defexpr ~root/.nix-channels ~/.nix-profile ~/.nix-defexpr ~/.nix-channels
```
There may also be references to Nix in `/etc/profile`, `/etc/bashrc`,
and `/etc/zshrc` which you may remove.
Remove build users and their group:
```console
for i in $(seq 1 32); do
sudo userdel nixbld$i
done
sudo groupdel nixbld
```
There may also be references to Nix in
- `/etc/profile`
- `/etc/bashrc`
- `/etc/zshrc`
which you may remove.
### macOS
@ -148,7 +180,8 @@ and `/etc/zshrc` which you may remove.
This will remove all the build users that no longer serve a purpose.
4. Edit fstab using `sudo vifs` to remove the line mounting the Nix Store
volume on `/nix`, which looks like this,
volume on `/nix`, which looks like
`UUID=<uuid> /nix apfs rw,noauto,nobrowse,suid,owners` or
`LABEL=Nix\040Store /nix apfs rw,nobrowse`. This will prevent automatic
mounting of the Nix Store volume.
@ -167,7 +200,7 @@ and `/etc/zshrc` which you may remove.
removed next.
7. Remove the Nix Store volume:
```console
sudo diskutil apfs deleteVolume /nix
```
@ -175,8 +208,20 @@ and `/etc/zshrc` which you may remove.
This will remove the Nix Store volume and everything that was added to the
store.
If the output indicates that the command couldn't remove the volume, you should
make sure you don't have an _unmounted_ Nix Store volume. Look for a
"Nix Store" volume in the output of the following command:
```console
diskutil list
```
If you _do_ see a "Nix Store" volume, delete it by re-running the diskutil
deleteVolume command, but replace `/nix` with the store volume's `diskXsY`
identifier.
> **Note**
>
>
> After you complete the steps here, you will still have an empty `/nix`
> directory. This is an expected sign of a successful uninstall. The empty
> `/nix` directory will disappear the next time you reboot.
@ -186,12 +231,12 @@ and `/etc/zshrc` which you may remove.
> read-only root will prevent you from manually deleting the empty `/nix`
> mountpoint.
# macOS Installation <a name="sect-macos-installation-change-store-prefix"></a><a name="sect-macos-installation-encrypted-volume"></a><a name="sect-macos-installation-symlink"></a><a name="sect-macos-installation-recommended-notes"></a>
# macOS Installation
[]{#sect-macos-installation-change-store-prefix}[]{#sect-macos-installation-encrypted-volume}[]{#sect-macos-installation-symlink}[]{#sect-macos-installation-recommended-notes}
<!-- Note: anchors above to catch permalinks to old explanations -->
We believe we have ironed out how to cleanly support the read-only root
on modern macOS. New installs will do this automatically, and you can
also re-run a new installer to convert your existing setup.
on modern macOS. New installs will do this automatically.
This section previously detailed the situation, options, and trade-offs,
but it now only outlines what the installer does. You don't need to know

2
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@ -104,7 +104,7 @@ a currently running program.
Packages are built from _Nix expressions_, which is a simple
functional language. A Nix expression describes everything that goes
into a package build action (a “derivation”): other packages, sources,
into a package build task (a “derivation”): other packages, sources,
the build script, environment variables for the build script, etc.
Nix tries very hard to ensure that Nix expressions are
_deterministic_: building a Nix expression twice should yield the same

22
doc/manual/src/expressions/advanced-attributes.md → doc/manual/src/language/advanced-attributes.md
View file

@ -2,7 +2,7 @@
Derivations can declare some infrequently used optional attributes.
- `allowedReferences`\
- [`allowedReferences`]{#adv-attr-allowedReferences}\
The optional attribute `allowedReferences` specifies a list of legal
references (dependencies) of the output of the builder. For example,
@ -17,7 +17,7 @@ Derivations can declare some infrequently used optional attributes.
booting Linux don’t have accidental dependencies on other paths in
the Nix store.
- `allowedRequisites`\
- [`allowedRequisites`]{#adv-attr-allowedRequisites}\
This attribute is similar to `allowedReferences`, but it specifies
the legal requisites of the whole closure, so all the dependencies
recursively. For example,
@ -30,7 +30,7 @@ Derivations can declare some infrequently used optional attributes.
runtime dependency than `foobar`, and in addition it enforces that
`foobar` itself doesn't introduce any other dependency itself.
- `disallowedReferences`\
- [`disallowedReferences`]{#adv-attr-disallowedReferences}\
The optional attribute `disallowedReferences` specifies a list of
illegal references (dependencies) of the output of the builder. For
example,
@ -42,7 +42,7 @@ Derivations can declare some infrequently used optional attributes.
enforces that the output of a derivation cannot have a direct
runtime dependencies on the derivation `foo`.
- `disallowedRequisites`\
- [`disallowedRequisites`]{#adv-attr-disallowedRequisites}\
This attribute is similar to `disallowedReferences`, but it
specifies illegal requisites for the whole closure, so all the
dependencies recursively. For example,
@ -55,7 +55,7 @@ Derivations can declare some infrequently used optional attributes.
dependency on `foobar` or any other derivation depending recursively
on `foobar`.
- `exportReferencesGraph`\
- [`exportReferencesGraph`]{#adv-attr-exportReferencesGraph}\
This attribute allows builders access to the references graph of
their inputs. The attribute is a list of inputs in the Nix store
whose references graph the builder needs to know. The value of
@ -84,7 +84,7 @@ Derivations can declare some infrequently used optional attributes.
with a Nix store containing the closure of a bootable NixOS
configuration).
- `impureEnvVars`\
- [`impureEnvVars`]{#adv-attr-impureEnvVars}\
This attribute allows you to specify a list of environment variables
that should be passed from the environment of the calling user to
the builder. Usually, the environment is cleared completely when the
@ -112,7 +112,7 @@ Derivations can declare some infrequently used optional attributes.
> environmental variables come from the environment of the
> `nix-build`.
- `outputHash`; `outputHashAlgo`; `outputHashMode`\
- [`outputHash`]{#adv-attr-outputHash}; [`outputHashAlgo`]{#adv-attr-outputHashAlgo}; [`outputHashMode`]{#adv-attr-outputHashMode}\
These attributes declare that the derivation is a so-called
*fixed-output derivation*, which means that a cryptographic hash of
the output is already known in advance. When the build of a
@ -208,7 +208,7 @@ Derivations can declare some infrequently used optional attributes.
[`nix-hash` command](../command-ref/nix-hash.md) for information
about converting to and from base-32 notation.)
- `__contentAddressed`
- [`__contentAddressed`]{#adv-attr-__contentAddressed}
If this **experimental** attribute is set to true, then the derivation
outputs will be stored in a content-addressed location rather than the
traditional input-addressed one.
@ -216,7 +216,7 @@ Derivations can declare some infrequently used optional attributes.
Setting this attribute also requires setting `outputHashMode` and `outputHashAlgo` like for *fixed-output derivations* (see above).
- `passAsFile`\
- [`passAsFile`]{#adv-attr-passAsFile}\
A list of names of attributes that should be passed via files rather
than environment variables. For example, if you have
@ -234,7 +234,7 @@ Derivations can declare some infrequently used optional attributes.
builder, since most operating systems impose a limit on the size
of the environment (typically, a few hundred kilobyte).
- `preferLocalBuild`\
- [`preferLocalBuild`]{#adv-attr-preferLocalBuild}\
If this attribute is set to `true` and [distributed building is
enabled](../advanced-topics/distributed-builds.md), then, if
possible, the derivation will be built locally instead of forwarded
@ -242,7 +242,7 @@ Derivations can declare some infrequently used optional attributes.
where the cost of doing a download or remote build would exceed
the cost of building locally.
- `allowSubstitutes`\
- [`allowSubstitutes`]{#adv-attr-allowSubstitutes}\
If this attribute is set to `false`, then Nix will always build this
derivation; it will not try to substitute its outputs. This is
useful for very trivial derivations (such as `writeText` in Nixpkgs)

2
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@ -14,7 +14,7 @@ Here are the constants built into the Nix expression evaluator:
This allows a Nix expression to fall back gracefully on older Nix
installations that don’t have the desired built-in function.
- `builtins.currentSystem`\
- [`builtins.currentSystem`]{#builtins-currentSystem}\
The built-in value `currentSystem` evaluates to the Nix platform
identifier for the Nix installation on which the expression is being
evaluated, such as `"i686-linux"` or `"x86_64-darwin"`.

0
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0
doc/manual/src/expressions/builtins-suffix.md → doc/manual/src/language/builtins-suffix.md
View file

0
doc/manual/src/expressions/language-constructs.md → doc/manual/src/language/constructs.md
View file

4
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View file

@ -1,10 +1,10 @@
# Derivations
The most important built-in function is `derivation`, which is used to
describe a single derivation (a build action). It takes as input a set,
describe a single derivation (a build task). It takes as input a set,
the attributes of which specify the inputs of the build.
- There must be an attribute named `system` whose value must be a
- There must be an attribute named [`system`]{#attr-system} whose value must be a
string specifying a Nix system type, such as `"i686-linux"` or
`"x86_64-darwin"`. (To figure out your system type, run `nix -vv
--version`.) The build can only be performed on a machine and

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# Nix Language
The Nix language is
- *domain-specific*
It only exists for the Nix package manager:
to describe packages and configurations as well as their variants and compositions.
It is not intended for general purpose use.
- *declarative*
There is no notion of executing sequential steps.
Dependencies between operations are established only through data.
- *pure*
Values cannot change during computation.
Functions always produce the same output if their input does not change.
- *functional*
Functions are like any other value.
Functions can be assigned to names, taken as arguments, or returned by functions.
- *lazy*
Expressions are only evaluated when their value is needed.
- *dynamically typed*
Type errors are only detected when expressions are evaluated.
# Overview
This is an incomplete overview of language features, by example.
<table>
<tr>
<th>
Example
</th>
<th>
Description
</th>
</tr>
<tr>
<td>
*Basic values*
</td>
<td>
</td>
</tr>
<tr>
<td>
`"hello world"`
</td>
<td>
A string
</td>
</tr>
<tr>
<td>
```
''
multi
line
string
''
```
</td>
<td>
A multi-line string. Strips common prefixed whitespace. Evaluates to `"multi\n line\n string"`.
</td>
</tr>
<tr>
<td>
`"hello ${ { a = "world" }.a }"`
`"1 2 ${toString 3}"`
`"${pkgs.bash}/bin/sh"`
</td>
<td>
String interpolation (expands to `"hello world"`, `"1 2 3"`, `"/nix/store/<hash>-bash-<version>/bin/sh"`)
</td>
</tr>
<tr>
<td>
`true`, `false`
</td>
<td>
Booleans
</td>
</tr>
<tr>
<td>
`null`
</td>
<td>
Null value
</td>
</tr>
<tr>
<td>
`123`
</td>
<td>
An integer
</td>
</tr>
<tr>
<td>
`3.141`
</td>
<td>
A floating point number
</td>
</tr>
<tr>
<td>
`/etc`
</td>
<td>
An absolute path
</td>
</tr>
<tr>
<td>
`./foo.png`
</td>
<td>
A path relative to the file containing this Nix expression
</td>
</tr>
<tr>
<td>
`~/.config`
</td>
<td>
A home path. Evaluates to the `"<user's home directory>/.config"`.
</td>
</tr>
<tr>
<td>
<nixpkgs>
</td>
<td>
Search path. Value determined by [`$NIX_PATH` environment variable](../command-ref/env-common.md#env-NIX_PATH).
</td>
</tr>
<tr>
<td>
*Compound values*
</td>
<td>
</td>
</tr>
<tr>
<td>
`{ x = 1; y = 2; }`
</td>
<td>
A set with attributes named `x` and `y`
</td>
</tr>
<tr>
<td>
`{ foo.bar = 1; }`
</td>
<td>
A nested set, equivalent to `{ foo = { bar = 1; }; }`
</td>
</tr>
<tr>
<td>
`rec { x = "foo"; y = x + "bar"; }`
</td>
<td>
A recursive set, equivalent to `{ x = "foo"; y = "foobar"; }`
</td>
</tr>
<tr>
<td>
`[ "foo" "bar" "baz" ]`
`[ 1 2 3 ]`
`[ (f 1) { a = 1; b = 2; } [ "c" ] ]`
</td>
<td>
Lists with three elements.
</td>
</tr>
<tr>
<td>
*Operators*
</td>
<td>
</td>
</tr>
<tr>
<td>
`"foo" + "bar"`
</td>
<td>
String concatenation
</td>
</tr>
<tr>
<td>
`1 + 2`
</td>
<td>
Integer addition
</td>
</tr>
<tr>
<td>
`"foo" == "f" + "oo"`
</td>
<td>
Equality test (evaluates to `true`)
</td>
</tr>
<tr>
<td>
`"foo" != "bar"`
</td>
<td>
Inequality test (evaluates to `true`)
</td>
</tr>
<tr>
<td>
`!true`
</td>
<td>
Boolean negation
</td>
</tr>
<tr>
<td>
`{ x = 1; y = 2; }.x`
</td>
<td>
Attribute selection (evaluates to `1`)
</td>
</tr>
<tr>
<td>
`{ x = 1; y = 2; }.z or 3`
</td>
<td>
Attribute selection with default (evaluates to `3`)
</td>
</tr>
<tr>
<td>
`{ x = 1; y = 2; } // { z = 3; }`
</td>
<td>
Merge two sets (attributes in the right-hand set taking precedence)
</td>
</tr>
<tr>
<td>
*Control structures*
</td>
<td>
</td>
</tr>
<tr>
<td>
`if 1 + 1 == 2 then "yes!" else "no!"`
</td>
<td>
Conditional expression
</td>
</tr>
<tr>
<td>
`assert 1 + 1 == 2; "yes!"`
</td>
<td>
Assertion check (evaluates to `"yes!"`).
</td>
</tr>
<tr>
<td>
`let x = "foo"; y = "bar"; in x + y`
</td>
<td>
Variable definition
</td>
</tr>
<tr>
<td>
`with builtins; head [ 1 2 3 ]`
</td>
<td>
Add all attributes from the given set to the scope (evaluates to `1`)
</td>
</tr>
<tr>
<td>
*Functions (lambdas)*
</td>
<td>
</td>
</tr>
<tr>
<td>
`x: x + 1`
</td>
<td>
A function that expects an integer and returns it increased by 1
</td>
</tr>
<tr>
<td>
`x: y: x + y`
</td>
<td>
Curried function, equivalent to `x: (y: x + y)`. Can be used like a function that takes two arguments and returns their sum.
</td>
</tr>
<tr>
<td>
`(x: x + 1) 100`
</td>
<td>
A function call (evaluates to 101)
</td>
</tr>
<tr>
<td>
`let inc = x: x + 1; in inc (inc (inc 100))`
</td>
<td>
A function bound to a variable and subsequently called by name (evaluates to 103)
</td>
</tr>
<tr>
<td>
`{ x, y }: x + y`
</td>
<td>
A function that expects a set with required attributes `x` and `y` and concatenates them
</td>
</tr>
<tr>
<td>
`{ x, y ? "bar" }: x + y`
</td>
<td>
A function that expects a set with required attribute `x` and optional `y`, using `"bar"` as default value for `y`
</td>
</tr>
<tr>
<td>
`{ x, y, ... }: x + y`
</td>
<td>
A function that expects a set with required attributes `x` and `y` and ignores any other attributes
</td>
</tr>
<tr>
<td>
`{ x, y } @ args: x + y`
`args @ { x, y }: x + y`
</td>
<td>
A function that expects a set with required attributes `x` and `y`, and binds the whole set to `args`
</td>
</tr>
<tr>
<td>
*Built-in functions*
</td>
<td>
</td>
</tr>
<tr>
<td>
`import ./foo.nix`
</td>
<td>
Load and return Nix expression in given file
</td>
</tr>
<tr>
<td>
`map (x: x + x) [ 1 2 3 ]`
</td>
<td>
Apply a function to every element of a list (evaluates to `[ 2 4 6 ]`)
</td>
</tr>
</table>

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# Operators
| Name | Syntax | Associativity | Precedence |
|----------------------------------------|--------------------------------------------|---------------|------------|
| [Attribute selection] | *attrset* `.` *attrpath* \[ `or` *expr* \] | none | 1 |
| Function application | *func* *expr* | left | 2 |
| [Arithmetic negation][arithmetic] | `-` *number* | none | 3 |
| [Has attribute] | *attrset* `?` *attrpath* | none | 4 |
| List concatenation | *list* `++` *list* | right | 5 |
| [Multiplication][arithmetic] | *number* `*` *number* | left | 6 |
| [Division][arithmetic] | *number* `/` *number* | left | 6 |
| [Subtraction][arithmetic] | *number* `-` *number* | left | 7 |
| [Addition][arithmetic] | *number* `+` *number* | left | 7 |
| [String concatenation] | *string* `+` *string* | left | 7 |
| [Path concatenation] | *path* `+` *path* | left | 7 |
| [Path and string concatenation] | *path* `+` *string* | left | 7 |
| [String and path concatenation] | *string* `+` *path* | left | 7 |
| Logical negation (`NOT`) | `!` *bool* | none | 8 |
| [Update] | *attrset* `//` *attrset* | right | 9 |
| [Less than][Comparison] | *expr* `<` *expr* | none | 10 |
| [Less than or equal to][Comparison] | *expr* `<=` *expr* | none | 10 |
| [Greater than][Comparison] | *expr* `>` *expr* | none | 10 |
| [Greater than or equal to][Comparison] | *expr* `>=` *expr* | none | 10 |
| [Equality] | *expr* `==` *expr* | none | 11 |
| Inequality | *expr* `!=` *expr* | none | 11 |
| Logical conjunction (`AND`) | *bool* `&&` *bool* | left | 12 |
| Logical disjunction (`OR`) | *bool* `||` *bool* | left | 13 |
| [Logical implication] | *bool* `->` *bool* | none | 14 |
[string]: ./values.md#type-string
[path]: ./values.md#type-path
[number]: ./values.md#type-number
[list]: ./values.md#list
[attribute set]: ./values.md#attribute-set
## Attribute selection
Select the attribute denoted by attribute path *attrpath* from [attribute set] *attrset*.
If the attribute doesn’t exist, return *value* if provided, otherwise abort evaluation.
<!-- FIXME: the following should to into its own language syntax section, but that needs more work to fit in well -->
An attribute path is a dot-separated list of attribute names.
An attribute name can be an identifier or a string.
> *attrpath* = *name* [ `.` *name* ]...
> *name* = *identifier* | *string*
> *identifier* ~ `[a-zA-Z_][a-zA-Z0-9_'-]*`
[Attribute selection]: #attribute-selection
## Has attribute
> *attrset* `?` *attrpath*
Test whether [attribute set] *attrset* contains the attribute denoted by *attrpath*.
The result is a [Boolean] value.
[Boolean]: ./values.md#type-boolean
[Has attribute]: #has-attribute
## Arithmetic
Numbers are type-compatible:
Pure integer operations will always return integers, whereas any operation involving at least one floating point number return a floating point number.
See also [Comparison] and [Equality].
The `+` operator is overloaded to also work on strings and paths.
[arithmetic]: #arithmetic
## String concatenation
> *string* `+` *string*
Concatenate two [string]s and merge their string contexts.
[String concatenation]: #string-concatenation
## Path concatenation
> *path* `+` *path*
Concatenate two [path]s.
The result is a path.
[Path concatenation]: #path-concatenation
## Path and string concatenation
> *path* + *string*
Concatenate *[path]* with *[string]*.
The result is a path.
> **Note**
>
> The string must not have a string context that refers to a [store path].
[Path and string concatenation]: #path-and-string-concatenation
## String and path concatenation
> *string* + *path*
Concatenate *[string]* with *[path]*.
The result is a string.
> **Important**
>
> The file or directory at *path* must exist and is copied to the [store].
> The path appears in the result as the corresponding [store path].
[store path]: ../glossary.md#gloss-store-path
[store]: ../glossary.md#gloss-store
[Path and string concatenation]: #path-and-string-concatenation
## Update
> *attrset1* + *attrset2*
Update [attribute set] *attrset1* with names and values from *attrset2*.
The returned attribute set will have of all the attributes in *e1* and *e2*.
If an attribute name is present in both, the attribute value from the former is taken.
[Update]: #update
## Comparison
Comparison is
- [arithmetic] for [number]s
- lexicographic for [string]s and [path]s
- item-wise lexicographic for [list]s:
elements at the same index in both lists are compared according to their type and skipped if they are equal.
All comparison operators are implemented in terms of `<`, and the following equivalencies hold:
| comparison | implementation |
|--------------|-----------------------|
| *a* `<=` *b* | `! (` *b* `<` *a* `)` |
| *a* `>` *b* | *b* `<` *a* |
| *a* `>=` *b* | `! (` *a* `<` *b* `)` |
[Comparison]: #comparison-operators
## Equality
- [Attribute sets][attribute set] and [list]s are compared recursively, and therefore are fully evaluated.
- Comparison of [function]s always returns `false`.
- Numbers are type-compatible, see [arithmetic] operators.
- Floating point numbers only differ up to a limited precision.
[function]: ./constructs.md#functions
[Equality]: #equality
## Logical implication
Equivalent to `!`*b1* `||` *b2*.
[Logical implication]: #logical-implication

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# String interpolation
String interpolation is a language feature where a [string], [path], or [attribute name] can contain expressions enclosed in `${ }` (dollar-sign with curly brackets).
Such a string is an *interpolated string*, and an expression inside is an *interpolated expression*.
Interpolated expressions must evaluate to one of the following:
- a [string]
- a [path]
- a [derivation]
[string]: ./values.md#type-string
[path]: ./values.md#type-path
[attribute name]: ./values.md#attribute-set
[derivation]: ../glossary.md#gloss-derivation
## Examples
### String
Rather than writing
```nix
"--with-freetype2-library=" + freetype + "/lib"
```
(where `freetype` is a [derivation]), you can instead write
```nix
"--with-freetype2-library=${freetype}/lib"
```
The latter is automatically translated to the former.
A more complicated example (from the Nix expression for [Qt](http://www.trolltech.com/products/qt)):
```nix
configureFlags = "
-system-zlib -system-libpng -system-libjpeg
${if openglSupport then "-dlopen-opengl
-L${mesa}/lib -I${mesa}/include
-L${libXmu}/lib -I${libXmu}/include" else ""}
${if threadSupport then "-thread" else "-no-thread"}
";
```
Note that Nix expressions and strings can be arbitrarily nested;
in this case the outer string contains various interpolated expressions that themselves contain strings (e.g., `"-thread"`), some of which in turn contain interpolated expressions (e.g., `${mesa}`).
### Path
Rather than writing
```nix
./. + "/" + foo + "-" + bar + ".nix"
```
or
```nix
./. + "/${foo}-${bar}.nix"
```
you can instead write
```nix
./${foo}-${bar}.nix
```
### Attribute name
Attribute names can be created dynamically with string interpolation:
```nix
let name = "foo"; in
{
${name} = "bar";
}
```
{ foo = "bar"; }

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# Data Types
## Primitives
- <a id="type-string" href="#type-string">String</a>
*Strings* can be written in three ways.
The most common way is to enclose the string between double quotes,
e.g., `"foo bar"`. Strings can span multiple lines. The special
characters `"` and `\` and the character sequence `${` must be
escaped by prefixing them with a backslash (`\`). Newlines, carriage
returns and tabs can be written as `\n`, `\r` and `\t`,
respectively.
You can include the results of other expressions into a string by enclosing them in `${ }`, a feature known as [string interpolation].
[string interpolation]: ./string-interpolation.md
The second way to write string literals is as an *indented string*,
which is enclosed between pairs of *double single-quotes*, like so:
```nix
''
This is the first line.
This is the second line.
This is the third line.
''
```
This kind of string literal intelligently strips indentation from
the start of each line. To be precise, it strips from each line a
number of spaces equal to the minimal indentation of the string as a
whole (disregarding the indentation of empty lines). For instance,
the first and second line are indented two spaces, while the third
line is indented four spaces. Thus, two spaces are stripped from
each line, so the resulting string is
```nix
"This is the first line.\nThis is the second line.\n This is the third line.\n"
```
Note that the whitespace and newline following the opening `''` is
ignored if there is no non-whitespace text on the initial line.
Indented strings support [string interpolation].
Since `${` and `''` have special meaning in indented strings, you
need a way to quote them. `$` can be escaped by prefixing it with
`''` (that is, two single quotes), i.e., `''$`. `''` can be escaped
by prefixing it with `'`, i.e., `'''`. `$` removes any special
meaning from the following `$`. Linefeed, carriage-return and tab
characters can be written as `''\n`, `''\r`, `''\t`, and `''\`
escapes any other character.
Indented strings are primarily useful in that they allow multi-line
string literals to follow the indentation of the enclosing Nix
expression, and that less escaping is typically necessary for
strings representing languages such as shell scripts and
configuration files because `''` is much less common than `"`.
Example:
```nix
stdenv.mkDerivation {
...
postInstall =
''
mkdir $out/bin $out/etc
cp foo $out/bin
echo "Hello World" > $out/etc/foo.conf
${if enableBar then "cp bar $out/bin" else ""}
'';
...
}
```
Finally, as a convenience, *URIs* as defined in appendix B of
[RFC 2396](http://www.ietf.org/rfc/rfc2396.txt) can be written *as
is*, without quotes. For instance, the string
`"http://example.org/foo.tar.bz2"` can also be written as
`http://example.org/foo.tar.bz2`.
- <a id="type-number" href="#type-number">Number</a>
Numbers, which can be *integers* (like `123`) or *floating point*
(like `123.43` or `.27e13`).
See [arithmetic] and [comparison] operators for semantics.
[arithmetic]: ./operators.md#arithmetic
[comparison]: ./operators.md#comparison
- <a id="type-path" href="#type-path">Path</a>
*Paths*, e.g., `/bin/sh` or `./builder.sh`. A path must contain at
least one slash to be recognised as such. For instance, `builder.sh`
is not a path: it's parsed as an expression that selects the
attribute `sh` from the variable `builder`. If the file name is
relative, i.e., if it does not begin with a slash, it is made
absolute at parse time relative to the directory of the Nix
expression that contained it. For instance, if a Nix expression in
`/foo/bar/bla.nix` refers to `../xyzzy/fnord.nix`, the absolute path
is `/foo/xyzzy/fnord.nix`.
If the first component of a path is a `~`, it is interpreted as if
the rest of the path were relative to the user's home directory.
e.g. `~/foo` would be equivalent to `/home/edolstra/foo` for a user
whose home directory is `/home/edolstra`.
Paths can also be specified between angle brackets, e.g.
`<nixpkgs>`. This means that the directories listed in the
environment variable `NIX_PATH` will be searched for the given file
or directory name.
When an [interpolated string][string interpolation] evaluates to a path, the path is first copied into the Nix store and the resulting string is the [store path] of the newly created [store object].
[store path]: ../glossary.md#gloss-store-path
[store object]: ../glossary.md#gloss-store-object
For instance, evaluating `"${./foo.txt}"` will cause `foo.txt` in the current directory to be copied into the Nix store and result in the string `"/nix/store/<hash>-foo.txt"`.
Note that the Nix language assumes that all input files will remain _unchanged_ while evaluating a Nix expression.
For example, assume you used a file path in an interpolated string during a `nix repl` session.
Later in the same session, after having changed the file contents, evaluating the interpolated string with the file path again might not return a new store path, since Nix might not re-read the file contents.
Paths themselves, except those in angle brackets (`< >`), support [string interpolation].
At least one slash (`/`) must appear *before* any interpolated expression for the result to be recognized as a path.
`a.${foo}/b.${bar}` is a syntactically valid division operation.
`./a.${foo}/b.${bar}` is a path.
- <a id="type-boolean" href="#type-boolean">Boolean</a>
*Booleans* with values `true` and `false`.
- <a id="type-null" href="#type-null">Null</a>
The null value, denoted as `null`.
## List
Lists are formed by enclosing a whitespace-separated list of values
between square brackets. For example,
```nix
[ 123 ./foo.nix "abc" (f { x = y; }) ]
```
defines a list of four elements, the last being the result of a call to
the function `f`. Note that function calls have to be enclosed in
parentheses. If they had been omitted, e.g.,
```nix
[ 123 ./foo.nix "abc" f { x = y; } ]
```
the result would be a list of five elements, the fourth one being a
function and the fifth being a set.
Note that lists are only lazy in values, and they are strict in length.
## Attribute Set
An attribute set is a collection of name-value-pairs (called *attributes*) enclosed in curly brackets (`{ }`).
Names and values are separated by an equal sign (`=`).
Each value is an arbitrary expression terminated by a semicolon (`;`).
Attributes can appear in any order.
An attribute name may only occur once.
Example:
```nix
{
x = 123;
text = "Hello";
y = f { bla = 456; };
}
```
This defines a set with attributes named `x`, `text`, `y`.
Attributes can be selected from a set using the `.` operator. For
instance,
```nix
{ a = "Foo"; b = "Bar"; }.a
```
evaluates to `"Foo"`. It is possible to provide a default value in an
attribute selection using the `or` keyword. For example,
```nix
{ a = "Foo"; b = "Bar"; }.c or "Xyzzy"
```
will evaluate to `"Xyzzy"` because there is no `c` attribute in the set.
You can use arbitrary double-quoted strings as attribute names:
```nix
{ "$!@#?" = 123; }."$!@#?"
```
```nix
let bar = "bar";
{ "foo ${bar}" = 123; }."foo ${bar}"
```
Both will evaluate to `123`.
Attribute names support [string interpolation]:
```nix
let bar = "foo"; in
{ foo = 123; }.${bar}
```
```nix
let bar = "foo"; in
{ ${bar} = 123; }.foo
```
Both will evaluate to `123`.
In the special case where an attribute name inside of a set declaration
evaluates to `null` (which is normally an error, as `null` cannot be coerced to
a string), that attribute is simply not added to the set:
```nix
{ ${if foo then "bar" else null} = true; }
```
This will evaluate to `{}` if `foo` evaluates to `false`.
A set that has a `__functor` attribute whose value is callable (i.e. is
itself a function or a set with a `__functor` attribute whose value is
callable) can be applied as if it were a function, with the set itself
passed in first , e.g.,
```nix
let add = { __functor = self: x: x + self.x; };
inc = add // { x = 1; };
in inc 1
```
evaluates to `2`. This can be used to attach metadata to a function
without the caller needing to treat it specially, or to implement a form
of object-oriented programming, for example.

3
doc/manual/src/package-management/package-management.md
View file

@ -1,5 +1,4 @@
This chapter discusses how to do package management with Nix, i.e.,
how to obtain, install, upgrade, and erase packages. This is the
“user’s” perspective of the Nix system — people who want to *create*
packages should consult the [chapter on writing Nix
expressions](../expressions/writing-nix-expressions.md).
packages should consult the chapter on the [Nix language](../language/index.md).

31
doc/manual/src/release-notes/rl-2.10.md Normal file
View file

@ -0,0 +1,31 @@
# Release 2.10 (2022-07-11)
* `nix repl` now takes installables on the command line, unifying the usage
with other commands that use `--file` and `--expr`. Primary breaking change
is for the common usage of `nix repl '<nixpkgs>'` which can be recovered with
`nix repl --file '<nixpkgs>'` or `nix repl --expr 'import <nixpkgs>{}'`.
This is currently guarded by the `repl-flake` experimental feature.
* A new function `builtins.traceVerbose` is available. It is similar
to `builtins.trace` if the `trace-verbose` setting is set to true,
and it is a no-op otherwise.
* `nix search` has a new flag `--exclude` to filter out packages.
* On Linux, if `/nix` doesn't exist and cannot be created and you're
not running as root, Nix will automatically use
`~/.local/share/nix/root` as a chroot store. This enables non-root
users to download the statically linked Nix binary and have it work
out of the box, e.g.
```
# ~/nix run nixpkgs#hello
warning: '/nix' does not exists, so Nix will use '/home/ubuntu/.local/share/nix/root' as a chroot store
Hello, world!
```
* `flake-registry.json` is now fetched from `channels.nixos.org`.
* Nix can now be built with LTO by passing `--enable-lto` to `configure`.
LTO is currently only supported when building with GCC.

5
doc/manual/src/release-notes/rl-2.11.md Normal file
View file

@ -0,0 +1,5 @@
# Release 2.11 (2022-08-24)
* `nix copy` now copies the store paths in parallel as much as possible (again).
This doesn't apply for the `daemon` and `ssh-ng` stores which copy everything
in one batch to avoid latencies issues.

43
doc/manual/src/release-notes/rl-2.12.md Normal file
View file

@ -0,0 +1,43 @@
# Release 2.12 (2022-12-06)
* On Linux, Nix can now run builds in a user namespace where they run
as root (UID 0) and have 65,536 UIDs available.
<!-- FIXME: move this to its own section about system features -->
This is primarily useful for running containers such as `systemd-nspawn`
inside a Nix build. For an example, see [`tests/systemd-nspawn/nix`][nspawn].
[nspawn]: https://github.com/NixOS/nix/blob/67bcb99700a0da1395fa063d7c6586740b304598/tests/systemd-nspawn.nix.
A build can enable this by setting the derivation attribute:
```
requiredSystemFeatures = [ "uid-range" ];
```
The `uid-range` [system feature] requires the [`auto-allocate-uids`]
setting to be enabled.
[system feature]: ../command-ref/conf-file.md#conf-system-features
* Nix can now automatically pick UIDs for builds, removing the need to
create `nixbld*` user accounts. See [`auto-allocate-uids`].
[`auto-allocate-uids`]: ../command-ref/conf-file.md#conf-auto-allocate-uids
* On Linux, Nix has experimental support for running builds inside a
cgroup. See
[`use-cgroups`](../command-ref/conf-file.md#conf-use-cgroups).
* `<nix/fetchurl.nix>` now accepts an additional argument `impure` which
defaults to `false`. If it is set to `true`, the `hash` and `sha256`
arguments will be ignored and the resulting derivation will have
`__impure` set to `true`, making it an impure derivation.
* If `builtins.readFile` is called on a file with context, then only
the parts of the context that appear in the content of the file are
retained. This avoids a lot of spurious errors where strings end up
having a context just because they are read from a store path
([#7260](https://github.com/NixOS/nix/pull/7260)).
* `nix build --json` now prints some statistics about top-level
derivations, such as CPU statistics when cgroups are enabled.

47
doc/manual/src/release-notes/rl-2.9.md Normal file
View file

@ -0,0 +1,47 @@
# Release 2.9 (2022-05-30)
* Running Nix with the new `--debugger` flag will cause it to start a
repl session if an exception is thrown during evaluation, or if
`builtins.break` is called. From there you can inspect the values
of variables and evaluate Nix expressions. In debug mode, the
following new repl commands are available:
```
:env Show env stack
:bt Show trace stack
:st Show current trace
:st <idx> Change to another trace in the stack
:c Go until end of program, exception, or builtins.break().
:s Go one step
```
Read more about the debugger
[here](https://www.zknotes.com/note/5970).
* Nix now provides better integration with zsh's `run-help`
feature. It is now included in the Nix installation in the form of
an autoloadable shell function, `run-help-nix`. It picks up Nix
subcommands from the currently typed in command and directs the user
to the associated man pages.
* `nix repl` has a new build-and-link (`:bl`) command that builds a
derivation while creating GC root symlinks.
* The path produced by `builtins.toFile` is now allowed to be imported
or read even with restricted evaluation. Note that this will not
work with a read-only store.
* `nix build` has a new `--print-out-paths` flag to print the
resulting output paths. This matches the default behaviour of
`nix-build`.
* You can now specify which outputs of a derivation `nix` should
operate on using the syntax `installable^outputs`,
e.g. `nixpkgs#glibc^dev,static` or `nixpkgs#glibc^*`. By default,
`nix` will use the outputs specified by the derivation's
`meta.outputsToInstall` attribute if it exists, or all outputs
otherwise.
* `builtins.fetchTree` (and flake inputs) can now be used to fetch
plain files over the `http(s)` and `file` protocols in addition to
directory tarballs.

22
doc/manual/src/release-notes/rl-next.md
View file

@ -1 +1,23 @@
# Release X.Y (202?-??-??)
* The `repeat` and `enforce-determinism` options have been removed
since they had been broken under many circumstances for a long time.
* You can now use [flake references] in the [old command line interface], e.g.
[flake references]: ../command-ref/new-cli/nix3-flake.md#flake-references
[old command line interface]: ../command-ref/main-commands.md
```
# nix-build flake:nixpkgs -A hello
# nix-build -I nixpkgs=flake:github:NixOS/nixpkgs/nixos-22.05 \
'<nixpkgs>' -A hello
# NIX_PATH=nixpkgs=flake:nixpkgs nix-build '<nixpkgs>' -A hello
```
* Instead of "antiquotation", the more common term [string interpolation](../language/string-interpolation.md) is now used consistently.
Historical release notes were not changed.
* Error traces have been reworked to provide detailed explanations and more
accurate error locations. A short excerpt of the trace is now shown by
default when an error occurs.

26
doc/manual/utils.nix
View file

@ -5,6 +5,32 @@ rec {
concatStrings = concatStringsSep "";
replaceStringsRec = from: to: string:
# recursively replace occurrences of `from` with `to` within `string`
# example:
# replaceStringRec "--" "-" "hello-----world"
# => "hello-world"
let
replaced = replaceStrings [ from ] [ to ] string;
in
if replaced == string then string else replaceStringsRec from to replaced;
squash = replaceStringsRec "\n\n\n" "\n\n";
trim = string:
# trim trailing spaces and squash non-leading spaces
let
trimLine = line:
let
# separate leading spaces from the rest
parts = split "(^ *)" line;
spaces = head (elemAt parts 1);
rest = elemAt parts 2;
# drop trailing spaces
body = head (split " *$" rest);
in spaces + replaceStringsRec " " " " body;
in concatStringsSep "\n" (map trimLine (splitLines string));
# FIXME: O(n^2)
unique = foldl' (acc: e: if elem e acc then acc else acc ++ [ e ]) [];

42
docker.nix
View file

@ -2,8 +2,12 @@
, lib ? pkgs.lib
, name ? "nix"
, tag ? "latest"
, bundleNixpkgs ? true
, channelName ? "nixpkgs"
, channelURL ? "https://nixos.org/channels/nixpkgs-unstable"
, extraPkgs ? []
, maxLayers ? 100
, nixConf ? {}
}:
let
defaultPkgs = with pkgs; [
@ -22,15 +26,27 @@ let
findutils
iana-etc
git
];
openssh
] ++ extraPkgs;
users = {
root = {
uid = 0;
shell = "/bin/bash";
shell = "${pkgs.bashInteractive}/bin/bash";
home = "/root";
gid = 0;
groups = [ "root" ];
description = "System administrator";
};
nobody = {
uid = 65534;
shell = "${pkgs.shadow}/bin/nologin";
home = "/var/empty";
gid = 65534;
groups = [ "nobody" ];
description = "Unprivileged account (don't use!)";
};
} // lib.listToAttrs (
@ -52,6 +68,7 @@ let
groups = {
root.gid = 0;
nixbld.gid = 30000;
nobody.gid = 65534;
};
userToPasswd = (
@ -120,20 +137,27 @@ let
(lib.attrValues (lib.mapAttrs groupToGroup groups))
);
nixConf = {
defaultNixConf = {
sandbox = "false";
build-users-group = "nixbld";
trusted-public-keys = "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=";
trusted-public-keys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
};
nixConfContents = (lib.concatStringsSep "\n" (lib.mapAttrsFlatten (n: v: "${n} = ${v}") nixConf)) + "\n";
nixConfContents = (lib.concatStringsSep "\n" (lib.mapAttrsFlatten (n: v:
let
vStr = if builtins.isList v then lib.concatStringsSep " " v else v;
in
"${n} = ${vStr}") (defaultNixConf // nixConf))) + "\n";
baseSystem =
let
nixpkgs = pkgs.path;
channel = pkgs.runCommand "channel-nixos" { } ''
channel = pkgs.runCommand "channel-nixos" { inherit bundleNixpkgs; } ''
mkdir $out
ln -s ${nixpkgs} $out/nixpkgs
echo "[]" > $out/manifest.nix
if [ "$bundleNixpkgs" ]; then
ln -s ${nixpkgs} $out/nixpkgs
echo "[]" > $out/manifest.nix
fi
'';
rootEnv = pkgs.buildPackages.buildEnv {
name = "root-profile-env";
@ -228,7 +252,7 @@ let
in
pkgs.dockerTools.buildLayeredImageWithNixDb {
inherit name tag;
inherit name tag maxLayers;
contents = [ baseSystem ];

18
flake.lock
View file

@ -18,17 +18,18 @@
},
"nixpkgs": {
"locked": {
"lastModified": 1645296114,
"narHash": "sha256-y53N7TyIkXsjMpOG7RhvqJFGDacLs9HlyHeSTBioqYU=",
"lastModified": 1670461440,
"narHash": "sha256-jy1LB8HOMKGJEGXgzFRLDU1CBGL0/LlkolgnqIsF0D8=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "530a53dcbc9437363471167a5e4762c5fcfa34a1",
"rev": "04a75b2eecc0acf6239acf9dd04485ff8d14f425",
"type": "github"
},
"original": {
"id": "nixpkgs",
"ref": "nixos-21.05-small",
"type": "indirect"
"owner": "NixOS",
"ref": "nixos-22.11-small",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs-regression": {
@ -41,9 +42,10 @@
"type": "github"
},
"original": {
"id": "nixpkgs",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
"type": "indirect"
"type": "github"
}
},
"root": {

168
flake.nix
View file

@ -1,29 +1,29 @@
{
description = "The purely functional package manager";
inputs.nixpkgs.url = "nixpkgs/nixos-21.05-small";
inputs.nixpkgs-regression.url = "nixpkgs/215d4d0fd80ca5163643b03a33fde804a29cc1e2";
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11-small";
inputs.nixpkgs-regression.url = "github:NixOS/nixpkgs/215d4d0fd80ca5163643b03a33fde804a29cc1e2";
inputs.lowdown-src = { url = "github:kristapsdz/lowdown"; flake = false; };
outputs = { self, nixpkgs, nixpkgs-regression, lowdown-src }:
let
version = builtins.readFile ./.version + versionSuffix;
officialRelease = false;
version = nixpkgs.lib.fileContents ./.version + versionSuffix;
versionSuffix =
if officialRelease
then ""
else "pre${builtins.substring 0 8 (self.lastModifiedDate or self.lastModified or "19700101")}_${self.shortRev or "dirty"}";
officialRelease = false;
linux64BitSystems = [ "x86_64-linux" "aarch64-linux" ];
linuxSystems = linux64BitSystems ++ [ "i686-linux" ];
systems = linuxSystems ++ [ "x86_64-darwin" "aarch64-darwin" ];
crossSystems = [ "armv6l-linux" "armv7l-linux" ];
stdenvs = [ "gccStdenv" "clangStdenv" "clang11Stdenv" "stdenv" ];
stdenvs = [ "gccStdenv" "clangStdenv" "clang11Stdenv" "stdenv" "libcxxStdenv" "ccacheStdenv" ];
forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
forAllSystemsAndStdenvs = f: forAllSystems (system:
@ -36,7 +36,7 @@
)
);
forAllStdenvs = stdenvs: f: nixpkgs.lib.genAttrs stdenvs (stdenv: f stdenv);
forAllStdenvs = f: nixpkgs.lib.genAttrs stdenvs (stdenv: f stdenv);
# Memoize nixpkgs for different platforms for efficiency.
nixpkgsFor =
@ -54,7 +54,7 @@
# we want most of the time and for backwards compatibility
forAllSystems (system: stdenvsPackages.${system} // stdenvsPackages.${system}.stdenvPackages);
commonDeps = pkgs: with pkgs; rec {
commonDeps = { pkgs, isStatic ? false }: with pkgs; rec {
# Use "busybox-sandbox-shell" if present,
# if not (legacy) fallback and hope it's sufficient.
sh = pkgs.busybox-sandbox-shell or (busybox.override {
@ -85,10 +85,11 @@
lib.optionals stdenv.isLinux [
"--with-boost=${boost}/lib"
"--with-sandbox-shell=${sh}/bin/busybox"
]
++ lib.optionals (stdenv.isLinux && !(isStatic && stdenv.system == "aarch64-linux")) [
"LDFLAGS=-fuse-ld=gold"
];
nativeBuildDeps =
[
buildPackages.bison
@ -102,7 +103,7 @@
# Tests
buildPackages.git
buildPackages.mercurial # FIXME: remove? only needed for tests
buildPackages.jq
buildPackages.jq # Also for custom mdBook preprocessor.
]
++ lib.optionals stdenv.hostPlatform.isLinux [(buildPackages.util-linuxMinimal or buildPackages.utillinuxMinimal)];
@ -126,20 +127,11 @@
});
propagatedDeps =
[ ((boehmgc.override {
[ (boehmgc.override {
enableLargeConfig = true;
}).overrideAttrs(o: {
patches = (o.patches or []) ++ [
./boehmgc-coroutine-sp-fallback.diff
];
}))
})
nlohmann_json
];
perlDeps =
[ perl
perlPackages.DBDSQLite
];
};
installScriptFor = systems:
@ -176,7 +168,7 @@
echo "file installer $out/install" >> $out/nix-support/hydra-build-products
'';
testNixVersions = pkgs: client: daemon: with commonDeps pkgs; with pkgs.lib; pkgs.stdenv.mkDerivation {
testNixVersions = pkgs: client: daemon: with commonDeps { inherit pkgs; }; with pkgs.lib; pkgs.stdenv.mkDerivation {
NIX_DAEMON_PACKAGE = daemon;
NIX_CLIENT_PACKAGE = client;
name =
@ -264,6 +256,7 @@
echo "file binary-dist $fn" >> $out/nix-support/hydra-build-products
tar cvfJ $fn \
--owner=0 --group=0 --mode=u+rw,uga+r \
--mtime='1970-01-01' \
--absolute-names \
--hard-dereference \
--transform "s,$TMPDIR/install,$dir/install," \
@ -287,7 +280,7 @@
# Forward from the previous stage as we don’t want it to pick the lowdown override
nixUnstable = prev.nixUnstable;
nix = with final; with commonDeps pkgs; currentStdenv.mkDerivation {
nix = with final; with commonDeps { inherit pkgs; }; currentStdenv.mkDerivation {
name = "nix-${version}";
inherit version;
@ -319,6 +312,7 @@
for LIB in $out/lib/*.dylib; do
chmod u+w $LIB
install_name_tool -id $LIB $LIB
install_name_tool -delete_rpath ${boost}/lib/ $LIB || true
done
install_name_tool -change ${boost}/lib/libboost_system.dylib $out/lib/libboost_system.dylib $out/lib/libboost_thread.dylib
''}
@ -353,7 +347,7 @@
strictDeps = true;
passthru.perl-bindings = with final; currentStdenv.mkDerivation {
passthru.perl-bindings = with final; perl.pkgs.toPerlModule (currentStdenv.mkDerivation {
name = "nix-perl-${version}";
src = self;
@ -375,16 +369,17 @@
++ lib.optional (currentStdenv.isLinux || currentStdenv.isDarwin) libsodium
++ lib.optional currentStdenv.isDarwin darwin.apple_sdk.frameworks.Security;
configureFlags = ''
--with-dbi=${perlPackages.DBI}/${pkgs.perl.libPrefix}
--with-dbd-sqlite=${perlPackages.DBDSQLite}/${pkgs.perl.libPrefix}
'';
configureFlags = [
"--with-dbi=${perlPackages.DBI}/${pkgs.perl.libPrefix}"
"--with-dbd-sqlite=${perlPackages.DBDSQLite}/${pkgs.perl.libPrefix}"
];
enableParallelBuilding = true;
postUnpack = "sourceRoot=$sourceRoot/perl";
};
});
meta.platforms = systems;
};
lowdown-nix = with final; currentStdenv.mkDerivation rec {
@ -409,7 +404,7 @@
# A Nixpkgs overlay that overrides the 'nix' and
# 'nix.perl-bindings' packages.
overlay = overlayFor (p: p.stdenv);
overlays.default = overlayFor (p: p.stdenv);
hydraJobs = {
@ -421,6 +416,8 @@
buildCross = nixpkgs.lib.genAttrs crossSystems (crossSystem:
nixpkgs.lib.genAttrs ["x86_64-linux"] (system: self.packages.${system}."nix-${crossSystem}"));
buildNoGc = nixpkgs.lib.genAttrs systems (system: self.packages.${system}.nix.overrideAttrs (a: { configureFlags = (a.configureFlags or []) ++ ["--enable-gc=no"];}));
# Perl bindings for various platforms.
perlBindings = nixpkgs.lib.genAttrs systems (system: self.packages.${system}.nix.perl-bindings);
@ -434,7 +431,7 @@
value = let
nixpkgsCross = import nixpkgs {
inherit system crossSystem;
overlays = [ self.overlay ];
overlays = [ self.overlays.default ];
};
in binaryTarball nixpkgsFor.${system} self.packages.${system}."nix-${crossSystem}" nixpkgsCross;
}) crossSystems));
@ -452,7 +449,7 @@
# Line coverage analysis.
coverage =
with nixpkgsFor.x86_64-linux;
with commonDeps pkgs;
with commonDeps { inherit pkgs; };
releaseTools.coverageAnalysis {
name = "nix-coverage-${version}";
@ -480,31 +477,37 @@
tests.remoteBuilds = import ./tests/remote-builds.nix {
system = "x86_64-linux";
inherit nixpkgs;
inherit (self) overlay;
overlay = self.overlays.default;
};
tests.nix-copy-closure = import ./tests/nix-copy-closure.nix {
system = "x86_64-linux";
inherit nixpkgs;
inherit (self) overlay;
overlay = self.overlays.default;
};
tests.nssPreload = (import ./tests/nss-preload.nix rec {
system = "x86_64-linux";
inherit nixpkgs;
inherit (self) overlay;
overlay = self.overlays.default;
});
tests.githubFlakes = (import ./tests/github-flakes.nix rec {
system = "x86_64-linux";
inherit nixpkgs;
inherit (self) overlay;
overlay = self.overlays.default;
});
tests.sourcehutFlakes = (import ./tests/sourcehut-flakes.nix rec {
system = "x86_64-linux";
inherit nixpkgs;
inherit (self) overlay;
overlay = self.overlays.default;
});
tests.containers = (import ./tests/containers.nix rec {
system = "x86_64-linux";
inherit nixpkgs;
overlay = self.overlays.default;
});
tests.setuid = nixpkgs.lib.genAttrs
@ -512,7 +515,7 @@
(system:
import ./tests/setuid.nix rec {
inherit nixpkgs system;
inherit (self) overlay;
overlay = self.overlays.default;
});
# Make sure that nix-env still produces the exact same result
@ -547,6 +550,11 @@
# againstLatestStable = testNixVersions pkgs pkgs.nix pkgs.nixStable;
} "touch $out");
installerTests = import ./tests/installer {
binaryTarballs = self.hydraJobs.binaryTarball;
inherit nixpkgsFor;
};
};
checks = forAllSystems (system: {
@ -557,12 +565,13 @@
dockerImage = self.hydraJobs.dockerImage.${system};
});
packages = forAllSystems (system: {
packages = forAllSystems (system: rec {
inherit (nixpkgsFor.${system}) nix;
default = nix;
} // (nixpkgs.lib.optionalAttrs (builtins.elem system linux64BitSystems) {
nix-static = let
nixpkgs = nixpkgsFor.${system}.pkgsStatic;
in with commonDeps nixpkgs; nixpkgs.stdenv.mkDerivation {
in with commonDeps { pkgs = nixpkgs; isStatic = true; }; nixpkgs.stdenv.mkDerivation {
name = "nix-${version}";
src = self;
@ -574,14 +583,24 @@
nativeBuildInputs = nativeBuildDeps;
buildInputs = buildDeps ++ propagatedDeps;
configureFlags = [ "--sysconfdir=/etc" ];
# Work around pkgsStatic disabling all tests.
# Remove in NixOS 22.11, see https://github.com/NixOS/nixpkgs/pull/140271.
preHook =
''
doCheck=1
doInstallCheck=1
'';
configureFlags =
configureFlags ++
[ "--sysconfdir=/etc"
"--enable-embedded-sandbox-shell"
];
enableParallelBuilding = true;
makeFlags = "profiledir=$(out)/etc/profile.d";
doCheck = true;
installFlags = "sysconfdir=$(out)/etc";
postInstall = ''
@ -591,7 +610,6 @@
echo "file binary-dist $out/bin/nix" >> $out/nix-support/hydra-build-products
'';
doInstallCheck = true;
installCheckFlags = "sysconfdir=$(out)/etc";
stripAllList = ["bin"];
@ -600,6 +618,7 @@
hardeningDisable = [ "pie" ];
};
dockerImage =
let
pkgs = nixpkgsFor.${system};
@ -614,14 +633,16 @@
ln -s ${image} $image
echo "file binary-dist $image" >> $out/nix-support/hydra-build-products
'';
} // builtins.listToAttrs (map (crossSystem: {
}
// builtins.listToAttrs (map (crossSystem: {
name = "nix-${crossSystem}";
value = let
nixpkgsCross = import nixpkgs {
inherit system crossSystem;
overlays = [ self.overlay ];
overlays = [ self.overlays.default ];
};
in with commonDeps nixpkgsCross; nixpkgsCross.stdenv.mkDerivation {
in with commonDeps { pkgs = nixpkgsCross; }; nixpkgsCross.stdenv.mkDerivation {
name = "nix-${version}";
src = self;
@ -653,44 +674,45 @@
doInstallCheck = true;
installCheckFlags = "sysconfdir=$(out)/etc";
};
}) crossSystems)) // (builtins.listToAttrs (map (stdenvName:
}) (if system == "x86_64-linux" then crossSystems else [])))
// (builtins.listToAttrs (map (stdenvName:
nixpkgsFor.${system}.lib.nameValuePair
"nix-${stdenvName}"
nixpkgsFor.${system}."${stdenvName}Packages".nix
) stdenvs)));
defaultPackage = forAllSystems (system: self.packages.${system}.nix);
devShells = forAllSystems (system:
forAllStdenvs (stdenv:
with nixpkgsFor.${system};
with commonDeps { inherit pkgs; };
nixpkgsFor.${system}.${stdenv}.mkDerivation {
name = "nix";
devShell = forAllSystems (system: self.devShells.${system}.stdenvPackages);
outputs = [ "out" "dev" "doc" ];
devShells = forAllSystemsAndStdenvs (system: stdenv:
with nixpkgsFor.${system};
with commonDeps pkgs;
nativeBuildInputs = nativeBuildDeps;
buildInputs = buildDeps ++ propagatedDeps ++ awsDeps;
nixpkgsFor.${system}.${stdenv}.mkDerivation {
name = "nix";
inherit configureFlags;
outputs = [ "out" "dev" "doc" ];
enableParallelBuilding = true;
nativeBuildInputs = nativeBuildDeps;
buildInputs = buildDeps ++ propagatedDeps ++ awsDeps ++ perlDeps;
installFlags = "sysconfdir=$(out)/etc";
inherit configureFlags;
shellHook =
''
PATH=$prefix/bin:$PATH
unset PYTHONPATH
export MANPATH=$out/share/man:$MANPATH
enableParallelBuilding = true;
installFlags = "sysconfdir=$(out)/etc";
shellHook =
''
PATH=$prefix/bin:$PATH
unset PYTHONPATH
export MANPATH=$out/share/man:$MANPATH
# Make bash completion work.
XDG_DATA_DIRS+=:$out/share
'';
});
# Make bash completion work.
XDG_DATA_DIRS+=:$out/share
'';
}
)
// { default = self.devShells.${system}.stdenv; }
);
};
}

79
maintainers/README.md Normal file
View file

@ -0,0 +1,79 @@
# Nix maintainers team
## Motivation
The goal of the team is to help other people to contribute to Nix.
## Members
- Eelco Dolstra (@edolstra) – Team lead
- Théophane Hufschmitt (@thufschmitt)
- Valentin Gagarin (@fricklerhandwerk)
- Thomas Bereknyei (@tomberek)
- Robert Hensing (@roberth)
## Meeting protocol
The team meets twice a week:
- Discussion meeting: [Fridays 13:00-14:00 CET](https://calendar.google.com/calendar/event?eid=MHNtOGVuNWtrZXNpZHR2bW1sM3QyN2ZjaGNfMjAyMjExMjVUMTIwMDAwWiBiOW81MmZvYnFqYWs4b3E4bGZraGczdDBxZ0Bn)
1. Triage issues and pull requests from the _No Status_ column (30 min)
2. Discuss issues and pull requests from the _To discuss_ column (30 min)
- Work meeting: [Mondays 13:00-15:00 CET](https://calendar.google.com/calendar/event?eid=NTM1MG1wNGJnOGpmOTZhYms3bTB1bnY5cWxfMjAyMjExMjFUMTIwMDAwWiBiOW81MmZvYnFqYWs4b3E4bGZraGczdDBxZ0Bn)
1. Code review on pull requests from _In review_.
2. Other chores and tasks.
Meeting notes are collected on a [collaborative scratchpad](https://pad.lassul.us/Cv7FpYx-Ri-4VjUykQOLAw), and published on Discourse under the [Nix category](https://discourse.nixos.org/c/dev/nix/50).
## Project board protocol
The team uses a [GitHub project board](https://github.com/orgs/NixOS/projects/19/views/1) for tracking its work.
Issues on the board progress through the following states:
- No Status
Team members can add pull requests or issues to discuss or review together.
During the discussion meeting, the team triages new items.
If there is disagreement on the general idea behind an issue or pull request, it is moved to _To discuss_, otherwise to _In review_.
- To discuss
Pull requests and issues that are important and controversial are discussed by the team during discussion meetings.
This may be where the merit of the change itself or the implementation strategy is contested by a team member.
- In review
Pull requests in this column are reviewed together during work meetings.
This is both for spreading implementation knowledge and for establishing common values in code reviews.
When the overall direction is agreed upon, even when further changes are required, the pull request is assigned to one team member.
- Assigned for merging
One team member is assigned to each of these pull requests.
They will communicate with the authors, and make the final approval once all remaining issues are addressed.
If more substantive issues arise, the assignee can move the pull request back to _To discuss_ to involve the team again.
The process is illustrated in the following diagram:
```mermaid
flowchart TD
discuss[To discuss]
review[To review]
New --> |Disagreement on idea| discuss
New & discuss --> |Consensus on idea| review
review --> |Consensus on implementation| Assigned
Assigned --> |Implementation issues arise| review
Assigned --> |Remaining issues fixed| Merged
```

6
maintainers/upload-release.pl
View file

@ -115,10 +115,6 @@ sub downloadFile {
write_file("$tmpFile.sha256", $sha256_actual);
if (! -e "$tmpFile.asc") {
system("gpg2 --detach-sign --armor $tmpFile") == 0 or die "unable to sign $tmpFile\n";
}
return $sha256_expected;
}
@ -194,7 +190,7 @@ for my $fn (glob "$tmpDir/*") {
my $configuration = ();
$configuration->{content_type} = "application/octet-stream";
if ($fn =~ /.sha256|.asc|install/) {
if ($fn =~ /.sha256|install/) {
# Text files
$configuration->{content_type} = "text/plain";
}

2
misc/launchd/org.nixos.nix-daemon.plist.in
View file

@ -28,7 +28,7 @@
<key>SoftResourceLimits</key>
<dict>
<key>NumberOfFiles</key>
<integer>4096</integer>
<integer>1048576</integer>
</dict>
</dict>
</plist>

1
misc/systemd/nix-daemon.service.in
View file

@ -9,6 +9,7 @@ ConditionPathIsReadWrite=@localstatedir@/nix/daemon-socket
[Service]
ExecStart=@@bindir@/nix-daemon nix-daemon --daemon
KillMode=process
LimitNOFILE=1048576
[Install]
WantedBy=multi-user.target

11
misc/zsh/completion.zsh
View file

@ -10,14 +10,15 @@ function _nix() {
local -a suggestions
declare -a suggestions
for suggestion in ${res:1}; do
# FIXME: This doesn't work properly if the suggestion word contains a `:`
# itself
suggestions+="${suggestion/ /:}"
suggestions+=("${suggestion%% *}")
done
local -a args
if [[ "$tpe" == filenames ]]; then
compadd -f
args+=('-f')
elif [[ "$tpe" == attrs ]]; then
args+=('-S' '')
fi
_describe 'nix' suggestions
compadd -J nix "${args[@]}" -a suggestions
}
_nix "$@"

1
misc/zsh/local.mk
View file

@ -1 +1,2 @@
$(eval $(call install-file-as, $(d)/completion.zsh, $(datarootdir)/zsh/site-functions/_nix, 0644))
$(eval $(call install-file-as, $(d)/run-help-nix, $(datarootdir)/zsh/site-functions/run-help-nix, 0644))

42
misc/zsh/run-help-nix Normal file
View file

@ -0,0 +1,42 @@
emulate -L zsh
# run-help is a zsh widget that can be bound to a key. It mainly looks up the
# man page for the currently typed in command.
#
# Although run-help works for any command without requiring special support,
# it can only deduce the right man page based solely on the name of the
# command. Programs like Nix provide better integration with run-help by
# helping zsh identify Nix subcommands and their corresponding man pages. This
# is what this function does.
#
# To actually use run-help on zsh, place the following lines in your .zshrc:
#
# (( $+aliases[run-help] )) && unalias run-help
# autoload -Uz run-help run-help-nix
#
# Then also assign run-help to any key of choice:
#
# bindkey '^[h' run-help
while [[ "$#" != 0 && "$1" == -* ]]; do
shift
done
local -a subcommands; subcommands=( nix3 )
local arg
for arg in "$@"; do
if man -w "${(j:-:)subcommands}-$arg" >/dev/null 2>&1; then
subcommands+="$arg"
else
break
fi
done
if (( $#subcommands > 1 )); then
man "${(j:-:)subcommands}"
else
man nix
fi
return $?

11
mk/common-test.sh Normal file
View file

@ -0,0 +1,11 @@
TESTS_ENVIRONMENT=("TEST_NAME=${test%.*}" 'NIX_REMOTE=')
: ${BASH:=/usr/bin/env bash}
init_test () {
cd tests && env "${TESTS_ENVIRONMENT[@]}" $BASH -e init.sh 2>/dev/null > /dev/null
}
run_test_proper () {
cd $(dirname $test) && env "${TESTS_ENVIRONMENT[@]}" $BASH -e $(basename $test)
}

11
mk/debug-test.sh Executable file
View file

@ -0,0 +1,11 @@
#!/usr/bin/env bash
set -eu
test=$1
dir="$(dirname "${BASH_SOURCE[0]}")"
source "$dir/common-test.sh"
(init_test)
run_test_proper

6
mk/libraries.mk
View file

@ -91,7 +91,7 @@ define build-library
$(1)_PATH := $$(_d)/$$($(1)_NAME).$(SO_EXT)
$$($(1)_PATH): $$($(1)_OBJS) $$(_libs) | $$(_d)/
$$(trace-ld) $(CXX) -o $$(abspath $$@) -shared $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$($(1)_LDFLAGS_PROPAGATED) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE)) $$($(1)_LDFLAGS_UNINSTALLED)
+$$(trace-ld) $(CXX) -o $$(abspath $$@) -shared $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$($(1)_LDFLAGS_PROPAGATED) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE)) $$($(1)_LDFLAGS_UNINSTALLED)
ifndef HOST_DARWIN
$(1)_LDFLAGS_USE += -Wl,-rpath,$$(abspath $$(_d))
@ -105,7 +105,7 @@ define build-library
$$(eval $$(call create-dir, $$($(1)_INSTALL_DIR)))
$$($(1)_INSTALL_PATH): $$($(1)_OBJS) $$(_libs_final) | $(DESTDIR)$$($(1)_INSTALL_DIR)/
$$(trace-ld) $(CXX) -o $$@ -shared $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$($(1)_LDFLAGS_PROPAGATED) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE_INSTALLED))
+$$(trace-ld) $(CXX) -o $$@ -shared $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$($(1)_LDFLAGS_PROPAGATED) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE_INSTALLED))
$(1)_LDFLAGS_USE_INSTALLED += -L$$(DESTDIR)$$($(1)_INSTALL_DIR) -l$$(patsubst lib%,%,$$(strip $$($(1)_NAME)))
ifndef HOST_DARWIN
@ -125,7 +125,7 @@ define build-library
$(1)_PATH := $$(_d)/$$($(1)_NAME).a
$$($(1)_PATH): $$($(1)_OBJS) | $$(_d)/
$$(trace-ld) $(LD) -Ur -o $$(_d)/$$($(1)_NAME).o $$?
+$$(trace-ld) $(LD) -Ur -o $$(_d)/$$($(1)_NAME).o $$^
$$(trace-ar) $(AR) crs $$@ $$(_d)/$$($(1)_NAME).o
$(1)_LDFLAGS_USE += $$($(1)_PATH) $$($(1)_LDFLAGS)

4
mk/programs.mk
View file

@ -32,7 +32,7 @@ define build-program
$$(eval $$(call create-dir, $$(_d)))
$$($(1)_PATH): $$($(1)_OBJS) $$(_libs) | $$(_d)/
$$(trace-ld) $(CXX) -o $$@ $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE))
+$$(trace-ld) $(CXX) -o $$@ $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE))
$(1)_INSTALL_DIR ?= $$(bindir)
@ -49,7 +49,7 @@ define build-program
_libs_final := $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_INSTALL_PATH))
$(DESTDIR)$$($(1)_INSTALL_PATH): $$($(1)_OBJS) $$(_libs_final) | $(DESTDIR)$$($(1)_INSTALL_DIR)/
$$(trace-ld) $(CXX) -o $$@ $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE_INSTALLED))
+$$(trace-ld) $(CXX) -o $$@ $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE_INSTALLED))
else

17
mk/run_test.sh → mk/run-test.sh
View file

@ -1,4 +1,4 @@
#!/bin/sh
#!/usr/bin/env bash
set -u
@ -7,7 +7,12 @@ green=""
yellow=""
normal=""
post_run_msg="ran test $1..."
test=$1
dir="$(dirname "${BASH_SOURCE[0]}")"
source "$dir/common-test.sh"
post_run_msg="ran test $test..."
if [ -t 1 ]; then
red=""
green=""
@ -16,12 +21,12 @@ if [ -t 1 ]; then
fi
run_test () {
(cd tests && env ${TESTS_ENVIRONMENT} init.sh 2>/dev/null > /dev/null)
log="$(cd $(dirname $1) && env ${TESTS_ENVIRONMENT} $(basename $1) 2>&1)"
(init_test 2>/dev/null > /dev/null)
log="$(run_test_proper 2>&1)"
status=$?
}
run_test "$1"
run_test
# Hack: Retry the test if it fails with “unexpected EOF reading a line” as these
# appear randomly without anyone knowing why.
@ -32,7 +37,7 @@ if [[ $status -ne 0 && $status -ne 99 && \
]]; then
echo "$post_run_msg [${yellow}FAIL$normal] (possibly flaky, so will be retried)"
echo "$log" | sed 's/^/ /'
run_test "$1"
run_test
fi
if [ $status -eq 0 ]; then

6
mk/tests.mk
View file

@ -8,7 +8,11 @@ define run-install-test
.PHONY: $1.test
$1.test: $1 $(test-deps)
@env TEST_NAME=$(basename $1) TESTS_ENVIRONMENT="$(tests-environment)" mk/run_test.sh $1 < /dev/null
@env BASH=$(bash) $(bash) mk/run-test.sh $1 < /dev/null
.PHONY: $1.test-debug
$1.test-debug: $1 $(test-deps)
@env BASH=$(bash) $(bash) mk/debug-test.sh $1 < /dev/null
endef

19
scripts/create-darwin-volume.sh
View file

@ -442,9 +442,14 @@ add_nix_vol_fstab_line() {
local escaped_mountpoint="${NIX_ROOT/ /'\\\'040}"
shift
# wrap `ex` to work around a problem with vim plugins breaking exit codes;
# (see https://github.com/NixOS/nix/issues/5468)
# we'd prefer EDITOR="/usr/bin/ex --noplugin" but vifs doesn't word-split
# wrap `ex` to work around problems w/ vim features breaking exit codes
# - plugins (see github.com/NixOS/nix/issues/5468): -u NONE
# - swap file: -n
#
# the first draft used `--noplugin`, but github.com/NixOS/nix/issues/6462
# suggests we need the less-semantic `-u NONE`
#
# we'd prefer EDITOR="/usr/bin/ex -u NONE" but vifs doesn't word-split
# the EDITOR env.
#
# TODO: at some point we should switch to `--clean`, but it wasn't added
@ -452,7 +457,7 @@ add_nix_vol_fstab_line() {
# minver 10.12.6 seems to have released with vim 7.4
cat > "$SCRATCH/ex_cleanroom_wrapper" <<EOF
#!/bin/sh
/usr/bin/ex --noplugin "\$@"
/usr/bin/ex -u NONE -n "\$@"
EOF
chmod 755 "$SCRATCH/ex_cleanroom_wrapper"
@ -646,8 +651,9 @@ EOF
task "Configuring /etc/synthetic.conf to make a mount-point at $NIX_ROOT" >&2
# technically /etc/synthetic.d/nix is supported in Big Sur+
# but handling both takes even more code...
# See earlier note; `-u NONE` disables vim plugins/rc, `-n` skips swapfile
_sudo "to add Nix to /etc/synthetic.conf" \
/usr/bin/ex --noplugin /etc/synthetic.conf <<EOF
/usr/bin/ex -u NONE -n /etc/synthetic.conf <<EOF
:a
${NIX_ROOT:1}
.
@ -815,7 +821,8 @@ setup_volume_daemon() {
local volume_uuid="$2"
if ! test_voldaemon; then
task "Configuring LaunchDaemon to mount '$NIX_VOLUME_LABEL'" >&2
_sudo "to install the Nix volume mounter" /usr/bin/ex --noplugin "$NIX_VOLUME_MOUNTD_DEST" <<EOF
# See earlier note; `-u NONE` disables vim plugins/rc, `-n` skips swapfile
_sudo "to install the Nix volume mounter" /usr/bin/ex -u NONE -n "$NIX_VOLUME_MOUNTD_DEST" <<EOF
:a
$(generate_mount_daemon "$cmd_type" "$volume_uuid")
.

2
scripts/install-darwin-multi-user.sh
View file

@ -167,7 +167,7 @@ poly_user_shell_get() {
}
poly_user_shell_set() {
_sudo "in order to give $1 a safe home directory" \
_sudo "in order to give $1 a safe shell" \
/usr/bin/dscl . -create "/Users/$1" "UserShell" "$2"
}

139
scripts/install-multi-user.sh
View file

@ -37,6 +37,19 @@ readonly PROFILE_TARGETS=("/etc/bashrc" "/etc/profile.d/nix.sh" "/etc/zshrc" "/e
readonly PROFILE_BACKUP_SUFFIX=".backup-before-nix"
readonly PROFILE_NIX_FILE="$NIX_ROOT/var/nix/profiles/default/etc/profile.d/nix-daemon.sh"
# Fish has different syntax than zsh/bash, treat it separate
readonly PROFILE_FISH_SUFFIX="conf.d/nix.fish"
readonly PROFILE_FISH_PREFIXES=(
# each of these are common values of $__fish_sysconf_dir,
# under which Fish will look for a file named
# $PROFILE_FISH_SUFFIX.
"/etc/fish" # standard
"/usr/local/etc/fish" # their installer .pkg for macOS
"/opt/homebrew/etc/fish" # homebrew
"/opt/local/etc/fish" # macports
)
readonly PROFILE_NIX_FILE_FISH="$NIX_ROOT/var/nix/profiles/default/etc/profile.d/nix-daemon.fish"
readonly NIX_INSTALLED_NIX="@nix@"
readonly NIX_INSTALLED_CACERT="@cacert@"
#readonly NIX_INSTALLED_NIX="/nix/store/j8dbv5w6jl34caywh2ygdy88knx1mdf7-nix-2.3.6"
@ -45,7 +58,7 @@ readonly EXTRACTED_NIX_PATH="$(dirname "$0")"
readonly ROOT_HOME=~root
if [ -t 0 ]; then
if [ -t 0 ] && [ -z "${NIX_INSTALLER_YES:-}" ]; then
readonly IS_HEADLESS='no'
else
readonly IS_HEADLESS='yes'
@ -59,14 +72,35 @@ headless() {
fi
}
is_root() {
if [ "$EUID" -eq 0 ]; then
return 0
else
return 1
fi
}
is_os_linux() {
if [ "$(uname -s)" = "Linux" ]; then
return 0
else
return 1
fi
}
is_os_darwin() {
if [ "$(uname -s)" = "Darwin" ]; then
return 0
else
return 1
fi
}
contact_us() {
echo "You can open an issue at https://github.com/nixos/nix/issues"
echo "You can open an issue at"
echo "https://github.com/NixOS/nix/issues/new?labels=installer&template=installer.md"
echo ""
echo "Or feel free to contact the team:"
echo " - Matrix: #nix:nixos.org"
echo " - IRC: in #nixos on irc.libera.chat"
echo " - twitter: @nixos_org"
echo " - forum: https://discourse.nixos.org"
echo "Or get in touch with the community: https://nixos.org/community"
}
get_help() {
echo "We'd love to help if you need it."
@ -313,14 +347,23 @@ __sudo() {
_sudo() {
local expl="$1"
shift
if ! headless; then
if ! headless || is_root; then
__sudo "$expl" "$*" >&2
fi
sudo "$@"
if is_root; then
env "$@"
else
sudo "$@"
fi
}
# Ensure that $TMPDIR exists if defined.
if [[ -n "${TMPDIR:-}" ]] && [[ ! -d "${TMPDIR:-}" ]]; then
mkdir -m 0700 -p "${TMPDIR:-}"
fi
readonly SCRATCH=$(mktemp -d "${TMPDIR:-/tmp/}tmp.XXXXXXXXXX")
readonly SCRATCH=$(mktemp -d)
finish_cleanup() {
rm -rf "$SCRATCH"
}
@ -329,7 +372,7 @@ finish_fail() {
finish_cleanup
failure <<EOF
Jeeze, something went wrong. If you can take all the output and open
Oh no, something went wrong. If you can take all the output and open
an issue, we'd love to fix the problem so nobody else has this issue.
:(
@ -423,7 +466,7 @@ EOF
fi
done
if [ "$(uname -s)" = "Linux" ] && [ ! -e /run/systemd/system ]; then
if is_os_linux && [ ! -e /run/systemd/system ]; then
warning <<EOF
We did not detect systemd on your system. With a multi-user install
without systemd you will have to manually configure your init system to
@ -532,7 +575,7 @@ EOF
# to extract _just_ the user's note, instead it is prefixed with
# some plist junk. This was causing the user note to always be set,
# even if there was no reason for it.
if ! poly_user_note_get "$username" | grep -q "Nix build user $coreid"; then
if poly_user_note_get "$username" | grep -q "Nix build user $coreid"; then
row " Note" "Nix build user $coreid"
else
poly_user_note_set "$username" "Nix build user $coreid"
@ -638,6 +681,17 @@ place_channel_configuration() {
fi
}
check_selinux() {
if command -v getenforce > /dev/null 2>&1; then
if [ "$(getenforce)" = "Enforcing" ]; then
failure <<EOF
Nix does not work with selinux enabled yet!
see https://github.com/NixOS/nix/issues/2374
EOF
fi
fi
}
welcome_to_nix() {
ok "Welcome to the Multi-User Nix Installation"
@ -766,7 +820,7 @@ EOF
fi
_sudo "to load data for the first time in to the Nix Database" \
"$NIX_INSTALLED_NIX/bin/nix-store" --load-db < ./.reginfo
HOME="$ROOT_HOME" "$NIX_INSTALLED_NIX/bin/nix-store" --load-db < ./.reginfo
echo " Just finished getting the nix database ready."
)
@ -784,6 +838,19 @@ fi
EOF
}
# Fish has differing syntax
fish_source_lines() {
cat <<EOF
# Nix
if test -e '$PROFILE_NIX_FILE_FISH'
. '$PROFILE_NIX_FILE_FISH'
end
# End Nix
EOF
}
configure_shell_profile() {
task "Setting up shell profiles: ${PROFILE_TARGETS[*]}"
for profile_target in "${PROFILE_TARGETS[@]}"; do
@ -805,6 +872,27 @@ configure_shell_profile() {
tee -a "$profile_target"
fi
done
task "Setting up shell profiles for Fish with with ${PROFILE_FISH_SUFFIX} inside ${PROFILE_FISH_PREFIXES[*]}"
for fish_prefix in "${PROFILE_FISH_PREFIXES[@]}"; do
if [ ! -d "$fish_prefix" ]; then
# this specific prefix (ie: /etc/fish) is very likely to exist
# if Fish is installed with this sysconfdir.
continue
fi
profile_target="${fish_prefix}/${PROFILE_FISH_SUFFIX}"
conf_dir=$(dirname "$profile_target")
if [ ! -d "$conf_dir" ]; then
_sudo "create $conf_dir for our Fish hook" \
mkdir "$conf_dir"
fi
fish_source_lines \
| _sudo "write nix-daemon settings to $profile_target" \
tee "$profile_target"
done
# TODO: should we suggest '. $PROFILE_NIX_FILE'? It would get them on
# their way less disruptively, but a counter-argument is that they won't
# immediately notice if something didn't get set up right?
@ -854,22 +942,14 @@ EOF
install -m 0664 "$SCRATCH/nix.conf" /etc/nix/nix.conf
}
main() {
# TODO: I've moved this out of validate_starting_assumptions so we
# can fail faster in this case. Sourcing install-darwin... now runs
# `touch /` to detect Read-only root, but it could update times on
# pre-Catalina macOS if run as root user.
if [ "$EUID" -eq 0 ]; then
failure <<EOF
Please do not run this script with root privileges. I will call sudo
when I need to.
EOF
fi
if [ "$(uname -s)" = "Darwin" ]; then
main() {
check_selinux
if is_os_darwin; then
# shellcheck source=./install-darwin-multi-user.sh
. "$EXTRACTED_NIX_PATH/install-darwin-multi-user.sh"
elif [ "$(uname -s)" = "Linux" ]; then
elif is_os_linux; then
# shellcheck source=./install-systemd-multi-user.sh
. "$EXTRACTED_NIX_PATH/install-systemd-multi-user.sh" # most of this works on non-systemd distros also
else
@ -877,7 +957,10 @@ EOF
fi
welcome_to_nix
chat_about_sudo
if ! is_root; then
chat_about_sudo
fi
cure_artifacts
# TODO: there's a tension between cure and validate. I moved the

39
scripts/install-nix-from-closure.sh
View file

@ -71,6 +71,8 @@ while [ $# -gt 0 ]; do
# # intentional tail space
# ACTIONS="${ACTIONS}uninstall "
# ;;
--yes)
export NIX_INSTALLER_YES=1;;
--no-channel-add)
export NIX_INSTALLER_NO_CHANNEL_ADD=1;;
--daemon-user-count)
@ -90,7 +92,7 @@ while [ $# -gt 0 ]; do
shift;;
*)
{
echo "Nix Installer [--daemon|--no-daemon] [--daemon-user-count INT] [--no-channel-add] [--no-modify-profile] [--nix-extra-conf-file FILE]"
echo "Nix Installer [--daemon|--no-daemon] [--daemon-user-count INT] [--yes] [--no-channel-add] [--no-modify-profile] [--nix-extra-conf-file FILE]"
echo "Choose installation method."
echo ""
@ -104,6 +106,8 @@ while [ $# -gt 0 ]; do
echo " trivial to uninstall."
echo " (default)"
echo ""
echo " --yes: Run the script non-interactively, accepting all prompts."
echo ""
echo " --no-channel-add: Don't add any channels. nixpkgs-unstable is installed by default."
echo ""
echo " --no-modify-profile: Don't modify the user profile to automatically load nix."
@ -148,7 +152,9 @@ if ! [ -w "$dest" ]; then
exit 1
fi
mkdir -p "$dest/store"
# The auto-chroot code in openFromNonUri() checks for the
# non-existence of /nix/var/nix, so we need to create it here.
mkdir -p "$dest/store" "$dest/var/nix"
printf "copying Nix to %s..." "${dest}/store" >&2
# Insert a newline if no progress is shown.
@ -207,31 +213,50 @@ if [ -z "$NIX_INSTALLER_NO_CHANNEL_ADD" ]; then
fi
added=
p=$HOME/.nix-profile/etc/profile.d/nix.sh
p=
p_sh=$HOME/.nix-profile/etc/profile.d/nix.sh
p_fish=$HOME/.nix-profile/etc/profile.d/nix.fish
if [ -z "$NIX_INSTALLER_NO_MODIFY_PROFILE" ]; then
# Make the shell source nix.sh during login.
for i in .bash_profile .bash_login .profile; do
fn="$HOME/$i"
if [ -w "$fn" ]; then
if ! grep -q "$p" "$fn"; then
if ! grep -q "$p_sh" "$fn"; then
echo "modifying $fn..." >&2
printf '\nif [ -e %s ]; then . %s; fi # added by Nix installer\n' "$p" "$p" >> "$fn"
printf '\nif [ -e %s ]; then . %s; fi # added by Nix installer\n' "$p_sh" "$p_sh" >> "$fn"
fi
added=1
p=${p_sh}
break
fi
done
for i in .zshenv .zshrc; do
fn="$HOME/$i"
if [ -w "$fn" ]; then
if ! grep -q "$p" "$fn"; then
if ! grep -q "$p_sh" "$fn"; then
echo "modifying $fn..." >&2
printf '\nif [ -e %s ]; then . %s; fi # added by Nix installer\n' "$p" "$p" >> "$fn"
printf '\nif [ -e %s ]; then . %s; fi # added by Nix installer\n' "$p_sh" "$p_sh" >> "$fn"
fi
added=1
p=${p_sh}
break
fi
done
if [ -d "$HOME/.config/fish" ]; then
fishdir=$HOME/.config/fish/conf.d
if [ ! -d "$fishdir" ]; then
mkdir -p "$fishdir"
fi
fn="$fishdir/nix.fish"
echo "placing $fn..." >&2
printf '\nif test -e %s; . %s; end # added by Nix installer\n' "$p_fish" "$p_fish" > "$fn"
added=1
p=${p_fish}
fi
else
p=${p_sh}
fi
if [ -z "$added" ]; then

4
scripts/install.in
View file

@ -40,12 +40,12 @@ case "$(uname -s).$(uname -m)" in
path=@tarballPath_aarch64-linux@
system=aarch64-linux
;;
Linux.armv6l_linux)
Linux.armv6l)
hash=@tarballHash_armv6l-linux@
path=@tarballPath_armv6l-linux@
system=armv6l-linux
;;
Linux.armv7l_linux)
Linux.armv7l)
hash=@tarballHash_armv7l-linux@
path=@tarballPath_armv7l-linux@
system=armv7l-linux

2
scripts/local.mk
View file

@ -6,6 +6,8 @@ noinst-scripts += $(nix_noinst_scripts)
profiledir = $(sysconfdir)/profile.d
$(eval $(call install-file-as, $(d)/nix-profile.sh, $(profiledir)/nix.sh, 0644))
$(eval $(call install-file-as, $(d)/nix-profile.fish, $(profiledir)/nix.fish, 0644))
$(eval $(call install-file-as, $(d)/nix-profile-daemon.sh, $(profiledir)/nix-daemon.sh, 0644))
$(eval $(call install-file-as, $(d)/nix-profile-daemon.fish, $(profiledir)/nix-daemon.fish, 0644))
clean-files += $(nix_noinst_scripts)

35
scripts/nix-profile-daemon.fish.in Normal file
View file

@ -0,0 +1,35 @@
# Only execute this file once per shell.
if test -n "$__ETC_PROFILE_NIX_SOURCED"
exit
end
set __ETC_PROFILE_NIX_SOURCED 1
set --export NIX_PROFILES "@localstatedir@/nix/profiles/default $HOME/.nix-profile"
# Set $NIX_SSL_CERT_FILE so that Nixpkgs applications like curl work.
if test -n "$NIX_SSH_CERT_FILE"
: # Allow users to override the NIX_SSL_CERT_FILE
else if test -e /etc/ssl/certs/ca-certificates.crt # NixOS, Ubuntu, Debian, Gentoo, Arch
set --export NIX_SSL_CERT_FILE /etc/ssl/certs/ca-certificates.crt
else if test -e /etc/ssl/ca-bundle.pem # openSUSE Tumbleweed
set --export NIX_SSL_CERT_FILE /etc/ssl/ca-bundle.pem
else if test -e /etc/ssl/certs/ca-bundle.crt # Old NixOS
set --export NIX_SSL_CERT_FILE /etc/ssl/certs/ca-bundle.crt
else if test -e /etc/pki/tls/certs/ca-bundle.crt # Fedora, CentOS
set --export NIX_SSL_CERT_FILE /etc/pki/tls/certs/ca-bundle.crt
else if test -e "$NIX_LINK/etc/ssl/certs/ca-bundle.crt" # fall back to cacert in Nix profile
set --export NIX_SSL_CERT_FILE "$NIX_LINK/etc/ssl/certs/ca-bundle.crt"
else if test -e "$NIX_LINK/etc/ca-bundle.crt" # old cacert in Nix profile
set --export NIX_SSL_CERT_FILE "$NIX_LINK/etc/ca-bundle.crt"
else
# Fall back to what is in the nix profiles, favouring whatever is defined last.
for i in $NIX_PROFILES
if test -e "$i/etc/ssl/certs/ca-bundle.crt"
set --export NIX_SSL_CERT_FILE "$i/etc/ssl/certs/ca-bundle.crt"
end
end
end
fish_add_path --prepend --global "@localstatedir@/nix/profiles/default/bin"
fish_add_path --prepend --global "$HOME/.nix-profile/bin"

37
scripts/nix-profile.fish.in Normal file
View file

@ -0,0 +1,37 @@
if test -n "$HOME" && test -n "$USER"
# Set up the per-user profile.
set NIX_LINK $HOME/.nix-profile
# Set up environment.
# This part should be kept in sync with nixpkgs:nixos/modules/programs/environment.nix
set --export NIX_PROFILES "@localstatedir@/nix/profiles/default $HOME/.nix-profile"
# Set $NIX_SSL_CERT_FILE so that Nixpkgs applications like curl work.
if test -n "$NIX_SSH_CERT_FILE"
: # Allow users to override the NIX_SSL_CERT_FILE
else if test -e /etc/ssl/certs/ca-certificates.crt # NixOS, Ubuntu, Debian, Gentoo, Arch
set --export NIX_SSL_CERT_FILE /etc/ssl/certs/ca-certificates.crt
else if test -e /etc/ssl/ca-bundle.pem # openSUSE Tumbleweed
set --export NIX_SSL_CERT_FILE /etc/ssl/ca-bundle.pem
else if test -e /etc/ssl/certs/ca-bundle.crt # Old NixOS
set --export NIX_SSL_CERT_FILE /etc/ssl/certs/ca-bundle.crt
else if test -e /etc/pki/tls/certs/ca-bundle.crt # Fedora, CentOS
set --export NIX_SSL_CERT_FILE /etc/pki/tls/certs/ca-bundle.crt
else if test -e "$NIX_LINK/etc/ssl/certs/ca-bundle.crt" # fall back to cacert in Nix profile
set --export NIX_SSL_CERT_FILE "$NIX_LINK/etc/ssl/certs/ca-bundle.crt"
else if test -e "$NIX_LINK/etc/ca-bundle.crt" # old cacert in Nix profile
set --export NIX_SSL_CERT_FILE "$NIX_LINK/etc/ca-bundle.crt"
end
# Only use MANPATH if it is already set. In general `man` will just simply
# pick up `.nix-profile/share/man` because is it close to `.nix-profile/bin`
# which is in the $PATH. For more info, run `manpath -d`.
if set --query MANPATH
set --export --prepend --path MANPATH "$NIX_LINK/share/man"
end
fish_add_path --prepend --global "$NIX_LINK/bin"
set --erase NIX_LINK
end

1
scripts/nix-profile.sh.in
View file

@ -1,7 +1,6 @@
if [ -n "$HOME" ] && [ -n "$USER" ]; then
# Set up the per-user profile.
# This part should be kept in sync with nixpkgs:nixos/modules/programs/shell.nix
NIX_LINK=$HOME/.nix-profile

4
src/build-remote/build-remote.cc
View file

@ -186,12 +186,12 @@ static int main_build_remote(int argc, char * * argv)
// build the hint template.
std::string errorText =
"Failed to find a machine for remote build!\n"
"derivation: %s\nrequired (system, features): (%s, %s)";
"derivation: %s\nrequired (system, features): (%s, [%s])";
errorText += "\n%s available machines:";
errorText += "\n(systems, maxjobs, supportedFeatures, mandatoryFeatures)";
for (unsigned int i = 0; i < machines.size(); ++i)
errorText += "\n(%s, %s, %s, %s)";
errorText += "\n([%s], %s, [%s], [%s])";
// add the template values.
std::string drvstr;

23
src/libcmd/command.cc
View file

@ -86,6 +86,12 @@ ref<Store> CopyCommand::getDstStore()
EvalCommand::EvalCommand()
{
addFlag({
.longName = "debugger",
.description = "Start an interactive environment if evaluation fails.",
.category = MixEvalArgs::category,
.handler = {&startReplOnEvalErrors, true},
});
}
EvalCommand::~EvalCommand()
@ -103,7 +109,7 @@ ref<Store> EvalCommand::getEvalStore()
ref<EvalState> EvalCommand::getEvalState()
{
if (!evalState)
if (!evalState) {
evalState =
#if HAVE_BOEHMGC
std::allocate_shared<EvalState>(traceable_allocator<EvalState>(),
@ -113,6 +119,11 @@ ref<EvalState> EvalCommand::getEvalState()
searchPath, getEvalStore(), getStore())
#endif
;
if (startReplOnEvalErrors) {
evalState->debugRepl = &runRepl;
};
}
return ref<EvalState>(evalState);
}
@ -197,17 +208,17 @@ void StorePathCommand::run(ref<Store> store, std::vector<StorePath> && storePath
run(store, *storePaths.begin());
}
Strings editorFor(const Pos & pos)
Strings editorFor(const Path & file, uint32_t line)
{
auto editor = getEnv("EDITOR").value_or("cat");
auto args = tokenizeString<Strings>(editor);
if (pos.line > 0 && (
if (line > 0 && (
editor.find("emacs") != std::string::npos ||
editor.find("nano") != std::string::npos ||
editor.find("vim") != std::string::npos ||
editor.find("kak") != std::string::npos))
args.push_back(fmt("+%d", pos.line));
args.push_back(pos.file);
args.push_back(fmt("+%d", line));
args.push_back(file);
return args;
}
@ -215,7 +226,7 @@ MixProfile::MixProfile()
{
addFlag({
.longName = "profile",
.description = "The profile to update.",
.description = "The profile to operate on.",
.labels = {"path"},
.handler = {&profile},
.completer = completePath

26
src/libcmd/command.hh
View file

@ -57,6 +57,9 @@ struct CopyCommand : virtual StoreCommand
struct EvalCommand : virtual StoreCommand, MixEvalArgs
{
bool startReplOnEvalErrors = false;
bool ignoreExceptionsDuringTry = false;
EvalCommand();
~EvalCommand();
@ -75,10 +78,16 @@ struct MixFlakeOptions : virtual Args, EvalCommand
{
flake::LockFlags lockFlags;
std::optional<std::string> needsFlakeInputCompletion = {};
MixFlakeOptions();
virtual std::optional<FlakeRef> getFlakeRefForCompletion()
virtual std::vector<std::string> getFlakesForCompletion()
{ return {}; }
void completeFlakeInput(std::string_view prefix);
void completionHook() override;
};
struct SourceExprCommand : virtual Args, MixFlakeOptions
@ -114,12 +123,13 @@ struct InstallablesCommand : virtual Args, SourceExprCommand
InstallablesCommand();
void prepare() override;
Installables load();
virtual bool useDefaultInstallables() { return true; }
std::optional<FlakeRef> getFlakeRefForCompletion() override;
std::vector<std::string> getFlakesForCompletion() override;
private:
protected:
std::vector<std::string> _installables;
};
@ -133,9 +143,9 @@ struct InstallableCommand : virtual Args, SourceExprCommand
void prepare() override;
std::optional<FlakeRef> getFlakeRefForCompletion() override
std::vector<std::string> getFlakesForCompletion() override
{
return parseFlakeRefWithFragment(_installable, absPath(".")).first;
return {_installable};
}
private:
@ -219,7 +229,7 @@ static RegisterCommand registerCommand2(std::vector<std::string> && name)
/* Helper function to generate args that invoke $EDITOR on
filename:lineno. */
Strings editorFor(const Pos & pos);
Strings editorFor(const Path & file, uint32_t line);
struct MixProfile : virtual StoreCommand
{
@ -270,4 +280,8 @@ void printClosureDiff(
const StorePath & afterPath,
std::string_view indent);
void runRepl(
ref<EvalState> evalState,
const ValMap & extraEnv);
}

97
src/libcmd/common-eval-args.cc
View file

@ -13,8 +13,6 @@ namespace nix {
MixEvalArgs::MixEvalArgs()
{
auto category = "Common evaluation options";
addFlag({
.longName = "arg",
.description = "Pass the value *expr* as the argument *name* to Nix functions.",
@ -34,7 +32,77 @@ MixEvalArgs::MixEvalArgs()
addFlag({
.longName = "include",
.shortName = 'I',
.description = "Add *path* to the list of locations used to look up `<...>` file names.",
.description = R"(
Add *path* to the Nix search path. The Nix search path is
initialized from the colon-separated [`NIX_PATH`](./env-common.md#env-NIX_PATH) environment
variable, and is used to look up the location of Nix expressions using [paths](../language/values.md#type-path) enclosed in angle
brackets (i.e., `<nixpkgs>`).
For instance, passing
```
-I /home/eelco/Dev
-I /etc/nixos
```
will cause Nix to look for paths relative to `/home/eelco/Dev` and
`/etc/nixos`, in that order. This is equivalent to setting the
`NIX_PATH` environment variable to
```
/home/eelco/Dev:/etc/nixos
```
It is also possible to match paths against a prefix. For example,
passing
```
-I nixpkgs=/home/eelco/Dev/nixpkgs-branch
-I /etc/nixos
```
will cause Nix to search for `<nixpkgs/path>` in
`/home/eelco/Dev/nixpkgs-branch/path` and `/etc/nixos/nixpkgs/path`.
If a path in the Nix search path starts with `http://` or `https://`,
it is interpreted as the URL of a tarball that will be downloaded and
unpacked to a temporary location. The tarball must consist of a single
top-level directory. For example, passing
```
-I nixpkgs=https://github.com/NixOS/nixpkgs/archive/master.tar.gz
```
tells Nix to download and use the current contents of the `master`
branch in the `nixpkgs` repository.
The URLs of the tarballs from the official `nixos.org` channels
(see [the manual page for `nix-channel`](../nix-channel.md)) can be
abbreviated as `channel:<channel-name>`. For instance, the
following two flags are equivalent:
```
-I nixpkgs=channel:nixos-21.05
-I nixpkgs=https://nixos.org/channels/nixos-21.05/nixexprs.tar.xz
```
You can also fetch source trees using [flake URLs](./nix3-flake.md#url-like-syntax) and add them to the
search path. For instance,
```
-I nixpkgs=flake:nixpkgs
```
specifies that the prefix `nixpkgs` shall refer to the source tree
downloaded from the `nixpkgs` entry in the flake registry. Similarly,
```
-I nixpkgs=flake:github:NixOS/nixpkgs/nixos-22.05
```
makes `<nixpkgs>` refer to a particular branch of the
`NixOS/nixpkgs` repository on GitHub.
)",
.category = category,
.labels = {"path"},
.handler = {[&](std::string s) { searchPath.push_back(s); }}
@ -91,14 +159,25 @@ Bindings * MixEvalArgs::getAutoArgs(EvalState & state)
Path lookupFileArg(EvalState & state, std::string_view s)
{
if (isUri(s)) {
return state.store->toRealPath(
fetchers::downloadTarball(
state.store, resolveUri(s), "source", false).first.storePath);
} else if (s.size() > 2 && s.at(0) == '<' && s.at(s.size() - 1) == '>') {
if (EvalSettings::isPseudoUrl(s)) {
auto storePath = fetchers::downloadTarball(
state.store, EvalSettings::resolvePseudoUrl(s), "source", false).first.storePath;
return state.store->toRealPath(storePath);
}
else if (hasPrefix(s, "flake:")) {
settings.requireExperimentalFeature(Xp::Flakes);
auto flakeRef = parseFlakeRef(std::string(s.substr(6)), {}, true, false);
auto storePath = flakeRef.resolve(state.store).fetchTree(state.store).first.storePath;
return state.store->toRealPath(storePath);
}
else if (s.size() > 2 && s.at(0) == '<' && s.at(s.size() - 1) == '>') {
Path p(s.substr(1, s.size() - 2));
return state.findFile(p);
} else
}
else
return absPath(std::string(s));
}

2
src/libcmd/common-eval-args.hh
View file

@ -10,6 +10,8 @@ class Bindings;
struct MixEvalArgs : virtual Args
{
static constexpr auto category = "Common evaluation options";
MixEvalArgs();
Bindings * getAutoArgs(EvalState & state);

370
src/libcmd/installables.cc
View file

@ -23,17 +23,6 @@
namespace nix {
void completeFlakeInputPath(
ref<EvalState> evalState,
const FlakeRef & flakeRef,
std::string_view prefix)
{
auto flake = flake::getFlake(*evalState, flakeRef, true);
for (auto & input : flake.inputs)
if (hasPrefix(input.first, prefix))
completions->add(input.first);
}
MixFlakeOptions::MixFlakeOptions()
{
auto category = "Common flake-related options";
@ -86,8 +75,7 @@ MixFlakeOptions::MixFlakeOptions()
lockFlags.inputUpdates.insert(flake::parseInputPath(s));
}},
.completer = {[&](size_t, std::string_view prefix) {
if (auto flakeRef = getFlakeRefForCompletion())
completeFlakeInputPath(getEvalState(), *flakeRef, prefix);
needsFlakeInputCompletion = {std::string(prefix)};
}}
});
@ -103,12 +91,10 @@ MixFlakeOptions::MixFlakeOptions()
parseFlakeRef(flakeRef, absPath("."), true));
}},
.completer = {[&](size_t n, std::string_view prefix) {
if (n == 0) {
if (auto flakeRef = getFlakeRefForCompletion())
completeFlakeInputPath(getEvalState(), *flakeRef, prefix);
} else if (n == 1) {
if (n == 0)
needsFlakeInputCompletion = {std::string(prefix)};
else if (n == 1)
completeFlakeRef(getEvalState()->store, prefix);
}
}}
});
@ -139,6 +125,24 @@ MixFlakeOptions::MixFlakeOptions()
});
}
void MixFlakeOptions::completeFlakeInput(std::string_view prefix)
{
auto evalState = getEvalState();
for (auto & flakeRefS : getFlakesForCompletion()) {
auto flakeRef = parseFlakeRefWithFragment(expandTilde(flakeRefS), absPath(".")).first;
auto flake = flake::getFlake(*evalState, flakeRef, true);
for (auto & input : flake.inputs)
if (hasPrefix(input.first, prefix))
completions->add(input.first);
}
}
void MixFlakeOptions::completionHook()
{
if (auto & prefix = needsFlakeInputCompletion)
completeFlakeInput(*prefix);
}
SourceExprCommand::SourceExprCommand(bool supportReadOnlyMode)
{
addFlag({
@ -146,7 +150,8 @@ SourceExprCommand::SourceExprCommand(bool supportReadOnlyMode)
.shortName = 'f',
.description =
"Interpret installables as attribute paths relative to the Nix expression stored in *file*. "
"If *file* is the character -, then a Nix expression will be read from standard input.",
"If *file* is the character -, then a Nix expression will be read from standard input. "
"Implies `--impure`.",
.category = installablesCategory,
.labels = {"file"},
.handler = {&file},
@ -163,7 +168,7 @@ SourceExprCommand::SourceExprCommand(bool supportReadOnlyMode)
addFlag({
.longName = "derivation",
.description = "Operate on the store derivation rather than its outputs.",
.description = "Operate on the [store derivation](../../glossary.md#gloss-store-derivation) rather than its outputs.",
.category = installablesCategory,
.handler = {&operateOn, OperateOn::Derivation},
});
@ -202,55 +207,59 @@ Strings SourceExprCommand::getDefaultFlakeAttrPathPrefixes()
void SourceExprCommand::completeInstallable(std::string_view prefix)
{
if (file) {
completionType = ctAttrs;
try {
if (file) {
completionType = ctAttrs;
evalSettings.pureEval = false;
auto state = getEvalState();
Expr *e = state->parseExprFromFile(
resolveExprPath(state->checkSourcePath(lookupFileArg(*state, *file)))
);
evalSettings.pureEval = false;
auto state = getEvalState();
Expr *e = state->parseExprFromFile(
resolveExprPath(state->checkSourcePath(lookupFileArg(*state, *file)))
);
Value root;
state->eval(e, root);
Value root;
state->eval(e, root);
auto autoArgs = getAutoArgs(*state);
auto autoArgs = getAutoArgs(*state);
std::string prefix_ = std::string(prefix);
auto sep = prefix_.rfind('.');
std::string searchWord;
if (sep != std::string::npos) {
searchWord = prefix_.substr(sep + 1, std::string::npos);
prefix_ = prefix_.substr(0, sep);
} else {
searchWord = prefix_;
prefix_ = "";
}
std::string prefix_ = std::string(prefix);
auto sep = prefix_.rfind('.');
std::string searchWord;
if (sep != std::string::npos) {
searchWord = prefix_.substr(sep + 1, std::string::npos);
prefix_ = prefix_.substr(0, sep);
} else {
searchWord = prefix_;
prefix_ = "";
}
auto [v, pos] = findAlongAttrPath(*state, prefix_, *autoArgs, root);
Value &v1(*v);
state->forceValue(v1, pos);
Value v2;
state->autoCallFunction(*autoArgs, v1, v2);
auto [v, pos] = findAlongAttrPath(*state, prefix_, *autoArgs, root);
Value &v1(*v);
state->forceValue(v1, pos);
Value v2;
state->autoCallFunction(*autoArgs, v1, v2);
if (v2.type() == nAttrs) {
for (auto & i : *v2.attrs) {
std::string name = i.name;
if (name.find(searchWord) == 0) {
if (prefix_ == "")
completions->add(name);
else
completions->add(prefix_ + "." + name);
if (v2.type() == nAttrs) {
for (auto & i : *v2.attrs) {
std::string name = state->symbols[i.name];
if (name.find(searchWord) == 0) {
if (prefix_ == "")
completions->add(name);
else
completions->add(prefix_ + "." + name);
}
}
}
} else {
completeFlakeRefWithFragment(
getEvalState(),
lockFlags,
getDefaultFlakeAttrPathPrefixes(),
getDefaultFlakeAttrPaths(),
prefix);
}
} else {
completeFlakeRefWithFragment(
getEvalState(),
lockFlags,
getDefaultFlakeAttrPathPrefixes(),
getDefaultFlakeAttrPaths(),
prefix);
} catch (EvalError&) {
// Don't want eval errors to mess-up with the completion engine, so let's just swallow them
}
}
@ -291,7 +300,7 @@ void completeFlakeRefWithFragment(
std::string lastAttr;
if (!attrPath.empty() && !hasSuffix(attrPathS, ".")) {
lastAttr = attrPath.back();
lastAttr = evalState->symbols[attrPath.back()];
attrPath.pop_back();
}
@ -299,11 +308,11 @@ void completeFlakeRefWithFragment(
if (!attr) continue;
for (auto & attr2 : (*attr)->getAttrs()) {
if (hasPrefix(attr2, lastAttr)) {
if (hasPrefix(evalState->symbols[attr2], lastAttr)) {
auto attrPath2 = (*attr)->getAttrPath(attr2);
/* Strip the attrpath prefix. */
attrPath2.erase(attrPath2.begin(), attrPath2.begin() + attrPathPrefix.size());
completions->add(flakeRefS + "#" + concatStringsSep(".", attrPath2));
completions->add(flakeRefS + "#" + concatStringsSep(".", evalState->symbols.resolve(attrPath2)));
}
}
}
@ -390,44 +399,56 @@ static StorePath getDeriver(
struct InstallableStorePath : Installable
{
ref<Store> store;
StorePath storePath;
DerivedPath req;
InstallableStorePath(ref<Store> store, StorePath && storePath)
: store(store), storePath(std::move(storePath)) { }
: store(store),
req(storePath.isDerivation()
? (DerivedPath) DerivedPath::Built {
.drvPath = std::move(storePath),
.outputs = {},
}
: (DerivedPath) DerivedPath::Opaque {
.path = std::move(storePath),
})
{ }
std::string what() const override { return store->printStorePath(storePath); }
InstallableStorePath(ref<Store> store, DerivedPath && req)
: store(store), req(std::move(req))
{ }
std::string what() const override
{
return req.to_string(*store);
}
DerivedPaths toDerivedPaths() override
{
if (storePath.isDerivation()) {
auto drv = store->readDerivation(storePath);
return {
DerivedPath::Built {
.drvPath = storePath,
.outputs = drv.outputNames(),
}
};
} else {
return {
DerivedPath::Opaque {
.path = storePath,
}
};
}
return { req };
}
StorePathSet toDrvPaths(ref<Store> store) override
{
if (storePath.isDerivation()) {
return {storePath};
} else {
return {getDeriver(store, *this, storePath)};
}
return std::visit(overloaded {
[&](const DerivedPath::Built & bfd) -> StorePathSet {
return { bfd.drvPath };
},
[&](const DerivedPath::Opaque & bo) -> StorePathSet {
return { getDeriver(store, *this, bo.path) };
},
}, req.raw());
}
std::optional<StorePath> getStorePath() override
{
return storePath;
return std::visit(overloaded {
[&](const DerivedPath::Built & bfd) {
return bfd.drvPath;
},
[&](const DerivedPath::Opaque & bo) {
return bo.path;
},
}, req.raw());
}
};
@ -440,10 +461,8 @@ DerivedPaths InstallableValue::toDerivedPaths()
// Group by derivation, helps with .all in particular
for (auto & drv : toDerivations()) {
auto outputName = drv.outputName;
if (outputName == "")
throw Error("derivation '%s' lacks an 'outputName' attribute", state->store->printStorePath(drv.drvPath));
drvsToOutputs[drv.drvPath].insert(outputName);
for (auto & outputName : drv.outputsToInstall)
drvsToOutputs[drv.drvPath].insert(outputName);
drvsToCopy.insert(drv.drvPath);
}
@ -466,14 +485,24 @@ struct InstallableAttrPath : InstallableValue
SourceExprCommand & cmd;
RootValue v;
std::string attrPath;
OutputsSpec outputsSpec;
InstallableAttrPath(ref<EvalState> state, SourceExprCommand & cmd, Value * v, const std::string & attrPath)
: InstallableValue(state), cmd(cmd), v(allocRootValue(v)), attrPath(attrPath)
InstallableAttrPath(
ref<EvalState> state,
SourceExprCommand & cmd,
Value * v,
const std::string & attrPath,
OutputsSpec outputsSpec)
: InstallableValue(state)
, cmd(cmd)
, v(allocRootValue(v))
, attrPath(attrPath)
, outputsSpec(std::move(outputsSpec))
{ }
std::string what() const override { return attrPath; }
std::pair<Value *, Pos> toValue(EvalState & state) override
std::pair<Value *, PosIdx> toValue(EvalState & state) override
{
auto [vRes, pos] = findAlongAttrPath(state, attrPath, *cmd.getAutoArgs(state), **v);
state.forceValue(*vRes, pos);
@ -497,7 +526,19 @@ std::vector<InstallableValue::DerivationInfo> InstallableAttrPath::toDerivations
auto drvPath = drvInfo.queryDrvPath();
if (!drvPath)
throw Error("'%s' is not a derivation", what());
res.push_back({ *drvPath, drvInfo.queryOutputName() });
std::set<std::string> outputsToInstall;
if (auto outputNames = std::get_if<OutputNames>(&outputsSpec))
outputsToInstall = *outputNames;
else
for (auto & output : drvInfo.queryOutputs(false, std::get_if<DefaultOutputs>(&outputsSpec)))
outputsToInstall.insert(output.first);
res.push_back(DerivationInfo {
.drvPath = *drvPath,
.outputsToInstall = std::move(outputsToInstall)
});
}
return res;
@ -550,7 +591,7 @@ ref<eval_cache::EvalCache> openEvalCache(
auto vFlake = state.allocValue();
flake::callFlake(state, *lockedFlake, *vFlake);
state.forceAttrs(*vFlake, noPos);
state.forceAttrs(*vFlake, noPos, "while parsing cached flake data");
auto aOutputs = vFlake->attrs->get(state.symbols.create("outputs"));
assert(aOutputs);
@ -574,6 +615,7 @@ InstallableFlake::InstallableFlake(
ref<EvalState> state,
FlakeRef && flakeRef,
std::string_view fragment,
OutputsSpec outputsSpec,
Strings attrPaths,
Strings prefixes,
const flake::LockFlags & lockFlags)
@ -581,6 +623,7 @@ InstallableFlake::InstallableFlake(
flakeRef(flakeRef),
attrPaths(fragment == "" ? attrPaths : Strings{(std::string) fragment}),
prefixes(fragment == "" ? Strings{} : prefixes),
outputsSpec(std::move(outputsSpec)),
lockFlags(lockFlags)
{
if (cmd && cmd->getAutoArgs(*state)->size())
@ -589,6 +632,8 @@ InstallableFlake::InstallableFlake(
std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableFlake::toDerivation()
{
Activity act(*logger, lvlTalkative, actUnknown, fmt("evaluating derivation '%s'", what()));
auto attr = getCursor(*state);
auto attrPath = attr->getAttrPathStr();
@ -598,9 +643,41 @@ std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableF
auto drvPath = attr->forceDerivation();
std::set<std::string> outputsToInstall;
std::optional<NixInt> priority;
if (auto aOutputSpecified = attr->maybeGetAttr(state->sOutputSpecified)) {
if (aOutputSpecified->getBool()) {
if (auto aOutputName = attr->maybeGetAttr("outputName"))
outputsToInstall = { aOutputName->getString() };
}
}
else if (auto aMeta = attr->maybeGetAttr(state->sMeta)) {
if (auto aOutputsToInstall = aMeta->maybeGetAttr("outputsToInstall"))
for (auto & s : aOutputsToInstall->getListOfStrings())
outputsToInstall.insert(s);
if (auto aPriority = aMeta->maybeGetAttr("priority"))
priority = aPriority->getInt();
}
if (outputsToInstall.empty() || std::get_if<AllOutputs>(&outputsSpec)) {
outputsToInstall.clear();
if (auto aOutputs = attr->maybeGetAttr(state->sOutputs))
for (auto & s : aOutputs->getListOfStrings())
outputsToInstall.insert(s);
}
if (outputsToInstall.empty())
outputsToInstall.insert("out");
if (auto outputNames = std::get_if<OutputNames>(&outputsSpec))
outputsToInstall = *outputNames;
auto drvInfo = DerivationInfo {
std::move(drvPath),
attr->getAttr(state->sOutputName)->getString()
.drvPath = std::move(drvPath),
.outputsToInstall = std::move(outputsToInstall),
.priority = priority,
};
return {attrPath, getLockedFlake()->flake.lockedRef, std::move(drvInfo)};
@ -613,7 +690,7 @@ std::vector<InstallableValue::DerivationInfo> InstallableFlake::toDerivations()
return res;
}
std::pair<Value *, Pos> InstallableFlake::toValue(EvalState & state)
std::pair<Value *, PosIdx> InstallableFlake::toValue(EvalState & state)
{
return {&getCursor(state)->forceValue(), noPos};
}
@ -716,22 +793,44 @@ std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
if (file == "-") {
auto e = state->parseStdin();
state->eval(e, *vFile);
} else if (file)
}
else if (file)
state->evalFile(lookupFileArg(*state, *file), *vFile);
else {
auto e = state->parseExprFromString(*expr, absPath("."));
state->eval(e, *vFile);
}
for (auto & s : ss)
result.push_back(std::make_shared<InstallableAttrPath>(state, *this, vFile, s == "." ? "" : s));
for (auto & s : ss) {
auto [prefix, outputsSpec] = parseOutputsSpec(s);
result.push_back(
std::make_shared<InstallableAttrPath>(
state, *this, vFile,
prefix == "." ? "" : prefix,
outputsSpec));
}
} else {
for (auto & s : ss) {
std::exception_ptr ex;
if (s.find('/') != std::string::npos) {
auto found = s.rfind('^');
if (found != std::string::npos) {
try {
result.push_back(std::make_shared<InstallableStorePath>(
store,
DerivedPath::Built::parse(*store, s.substr(0, found), s.substr(found + 1))));
continue;
} catch (BadStorePath &) {
} catch (...) {
if (!ex)
ex = std::current_exception();
}
}
found = s.find('/');
if (found != std::string::npos) {
try {
result.push_back(std::make_shared<InstallableStorePath>(store, store->followLinksToStorePath(s)));
continue;
@ -743,12 +842,13 @@ std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
}
try {
auto [flakeRef, fragment] = parseFlakeRefWithFragment(s, absPath("."));
auto [flakeRef, fragment, outputsSpec] = parseFlakeRefWithFragmentAndOutputsSpec(s, absPath("."));
result.push_back(std::make_shared<InstallableFlake>(
this,
getEvalState(),
std::move(flakeRef),
fragment,
outputsSpec,
getDefaultFlakeAttrPaths(),
getDefaultFlakeAttrPathPrefixes(),
lockFlags));
@ -772,20 +872,20 @@ std::shared_ptr<Installable> SourceExprCommand::parseInstallable(
return installables.front();
}
BuiltPaths Installable::build(
std::vector<BuiltPathWithResult> Installable::build(
ref<Store> evalStore,
ref<Store> store,
Realise mode,
const std::vector<std::shared_ptr<Installable>> & installables,
BuildMode bMode)
{
BuiltPaths res;
for (auto & [_, builtPath] : build2(evalStore, store, mode, installables, bMode))
res.push_back(builtPath);
std::vector<BuiltPathWithResult> res;
for (auto & [_, builtPathWithResult] : build2(evalStore, store, mode, installables, bMode))
res.push_back(builtPathWithResult);
return res;
}
std::vector<std::pair<std::shared_ptr<Installable>, BuiltPath>> Installable::build2(
std::vector<std::pair<std::shared_ptr<Installable>, BuiltPathWithResult>> Installable::build2(
ref<Store> evalStore,
ref<Store> store,
Realise mode,
@ -805,7 +905,7 @@ std::vector<std::pair<std::shared_ptr<Installable>, BuiltPath>> Installable::bui
}
}
std::vector<std::pair<std::shared_ptr<Installable>, BuiltPath>> res;
std::vector<std::pair<std::shared_ptr<Installable>, BuiltPathWithResult>> res;
switch (mode) {
@ -822,32 +922,31 @@ std::vector<std::pair<std::shared_ptr<Installable>, BuiltPath>> Installable::bui
auto outputHashes = staticOutputHashes(*evalStore, drv); // FIXME: expensive
auto drvOutputs = drv.outputsAndOptPaths(*store);
for (auto & output : bfd.outputs) {
if (!outputHashes.count(output))
auto outputHash = get(outputHashes, output);
if (!outputHash)
throw Error(
"the derivation '%s' doesn't have an output named '%s'",
store->printStorePath(bfd.drvPath), output);
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
DrvOutput outputId { outputHashes.at(output), output };
DrvOutput outputId { *outputHash, output };
auto realisation = store->queryRealisation(outputId);
if (!realisation)
throw Error(
"cannot operate on an output of unbuilt "
"content-addressed derivation '%s'",
outputId.to_string());
throw MissingRealisation(outputId);
outputs.insert_or_assign(output, realisation->outPath);
} else {
// If ca-derivations isn't enabled, assume that
// the output path is statically known.
assert(drvOutputs.count(output));
assert(drvOutputs.at(output).second);
auto drvOutput = get(drvOutputs, output);
assert(drvOutput);
assert(drvOutput->second);
outputs.insert_or_assign(
output, *drvOutputs.at(output).second);
output, *drvOutput->second);
}
}
res.push_back({installable, BuiltPath::Built { bfd.drvPath, outputs }});
res.push_back({installable, {.path = BuiltPath::Built { bfd.drvPath, outputs }}});
},
[&](const DerivedPath::Opaque & bo) {
res.push_back({installable, BuiltPath::Opaque { bo.path }});
res.push_back({installable, {.path = BuiltPath::Opaque { bo.path }}});
},
}, path.raw());
}
@ -856,6 +955,9 @@ std::vector<std::pair<std::shared_ptr<Installable>, BuiltPath>> Installable::bui
break;
case Realise::Outputs: {
if (settings.printMissing)
printMissing(store, pathsToBuild, lvlInfo);
for (auto & buildResult : store->buildPathsWithResults(pathsToBuild, bMode, evalStore)) {
if (!buildResult.success())
buildResult.rethrow();
@ -866,10 +968,10 @@ std::vector<std::pair<std::shared_ptr<Installable>, BuiltPath>> Installable::bui
std::map<std::string, StorePath> outputs;
for (auto & path : buildResult.builtOutputs)
outputs.emplace(path.first.outputName, path.second.outPath);
res.push_back({installable, BuiltPath::Built { bfd.drvPath, outputs }});
res.push_back({installable, {.path = BuiltPath::Built { bfd.drvPath, outputs }, .result = buildResult}});
},
[&](const DerivedPath::Opaque & bo) {
res.push_back({installable, BuiltPath::Opaque { bo.path }});
res.push_back({installable, {.path = BuiltPath::Opaque { bo.path }, .result = buildResult}});
},
}, buildResult.path.raw());
}
@ -892,9 +994,12 @@ BuiltPaths Installable::toBuiltPaths(
OperateOn operateOn,
const std::vector<std::shared_ptr<Installable>> & installables)
{
if (operateOn == OperateOn::Output)
return Installable::build(evalStore, store, mode, installables);
else {
if (operateOn == OperateOn::Output) {
BuiltPaths res;
for (auto & p : Installable::build(evalStore, store, mode, installables))
res.push_back(p.path);
return res;
} else {
if (mode == Realise::Nothing)
settings.readOnlyMode = true;
@ -969,21 +1074,26 @@ InstallablesCommand::InstallablesCommand()
void InstallablesCommand::prepare()
{
installables = load();
}
Installables InstallablesCommand::load() {
Installables installables;
if (_installables.empty() && useDefaultInstallables())
// FIXME: commands like "nix profile install" should not have a
// default, probably.
_installables.push_back(".");
installables = parseInstallables(getStore(), _installables);
return parseInstallables(getStore(), _installables);
}
std::optional<FlakeRef> InstallablesCommand::getFlakeRefForCompletion()
std::vector<std::string> InstallablesCommand::getFlakesForCompletion()
{
if (_installables.empty()) {
if (useDefaultInstallables())
return parseFlakeRefWithFragment(".", absPath(".")).first;
return {"."};
return {};
}
return parseFlakeRefWithFragment(_installables.front(), absPath(".")).first;
return _installables;
}
InstallableCommand::InstallableCommand(bool supportReadOnlyMode)

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