Merge remote-tracking branch 'origin/master' into parallel-nix-copy
This commit is contained in:
Eelco Dolstra
commit
4c96761c2b
2
.gitignore
vendored
2
.gitignore
vendored
|
|
@ -22,7 +22,7 @@ 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
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -296,15 +296,6 @@ 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)
|
||||
|
|
|
|||
|
|
@ -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 \
|
||||
|
|
@ -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
|
||||
|
|
@ -97,7 +101,7 @@ doc/manual/generated/man1/nix3-manpages: $(d)/src/command-ref/new-cli
|
|||
done
|
||||
@touch $@
|
||||
|
||||
$(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/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
|
||||
|
|
|
|||
|
|
@ -132,113 +132,106 @@ var redirects = {
|
|||
"#sec-common-options": "command-ref/opt-common.html",
|
||||
"#ch-utilities": "command-ref/utilities.html",
|
||||
"#chap-hacking": "contributing/hacking.html",
|
||||
"#adv-attr-allowSubstitutes": "expressions/advanced-attributes.html#adv-attr-allowSubstitutes",
|
||||
"#adv-attr-allowedReferences": "expressions/advanced-attributes.html#adv-attr-allowedReferences",
|
||||
"#adv-attr-allowedRequisites": "expressions/advanced-attributes.html#adv-attr-allowedRequisites",
|
||||
"#adv-attr-disallowedReferences": "expressions/advanced-attributes.html#adv-attr-disallowedReferences",
|
||||
"#adv-attr-disallowedRequisites": "expressions/advanced-attributes.html#adv-attr-disallowedRequisites",
|
||||
"#adv-attr-exportReferencesGraph": "expressions/advanced-attributes.html#adv-attr-exportReferencesGraph",
|
||||
"#adv-attr-impureEnvVars": "expressions/advanced-attributes.html#adv-attr-impureEnvVars",
|
||||
"#adv-attr-outputHash": "expressions/advanced-attributes.html#adv-attr-outputHash",
|
||||
"#adv-attr-outputHashAlgo": "expressions/advanced-attributes.html#adv-attr-outputHashAlgo",
|
||||
"#adv-attr-outputHashMode": "expressions/advanced-attributes.html#adv-attr-outputHashMode",
|
||||
"#adv-attr-passAsFile": "expressions/advanced-attributes.html#adv-attr-passAsFile",
|
||||
"#adv-attr-preferLocalBuild": "expressions/advanced-attributes.html#adv-attr-preferLocalBuild",
|
||||
"#fixed-output-drvs": "expressions/advanced-attributes.html#adv-attr-outputHash",
|
||||
"#sec-advanced-attributes": "expressions/advanced-attributes.html",
|
||||
"#sec-arguments": "expressions/arguments-variables.html",
|
||||
"#sec-build-script": "expressions/build-script.html",
|
||||
"#builtin-abort": "expressions/builtins.html#builtins-abort",
|
||||
"#builtin-add": "expressions/builtins.html#builtins-add",
|
||||
"#builtin-all": "expressions/builtins.html#builtins-all",
|
||||
"#builtin-any": "expressions/builtins.html#builtins-any",
|
||||
"#builtin-attrNames": "expressions/builtins.html#builtins-attrNames",
|
||||
"#builtin-attrValues": "expressions/builtins.html#builtins-attrValues",
|
||||
"#builtin-baseNameOf": "expressions/builtins.html#builtins-baseNameOf",
|
||||
"#builtin-bitAnd": "expressions/builtins.html#builtins-bitAnd",
|
||||
"#builtin-bitOr": "expressions/builtins.html#builtins-bitOr",
|
||||
"#builtin-bitXor": "expressions/builtins.html#builtins-bitXor",
|
||||
"#builtin-builtins": "expressions/builtins.html#builtins-builtins",
|
||||
"#builtin-compareVersions": "expressions/builtins.html#builtins-compareVersions",
|
||||
"#builtin-concatLists": "expressions/builtins.html#builtins-concatLists",
|
||||
"#builtin-concatStringsSep": "expressions/builtins.html#builtins-concatStringsSep",
|
||||
"#builtin-currentSystem": "expressions/builtins.html#builtins-currentSystem",
|
||||
"#builtin-deepSeq": "expressions/builtins.html#builtins-deepSeq",
|
||||
"#builtin-derivation": "expressions/builtins.html#builtins-derivation",
|
||||
"#builtin-dirOf": "expressions/builtins.html#builtins-dirOf",
|
||||
"#builtin-div": "expressions/builtins.html#builtins-div",
|
||||
"#builtin-elem": "expressions/builtins.html#builtins-elem",
|
||||
"#builtin-elemAt": "expressions/builtins.html#builtins-elemAt",
|
||||
"#builtin-fetchGit": "expressions/builtins.html#builtins-fetchGit",
|
||||
"#builtin-fetchTarball": "expressions/builtins.html#builtins-fetchTarball",
|
||||
"#builtin-fetchurl": "expressions/builtins.html#builtins-fetchurl",
|
||||
"#builtin-filterSource": "expressions/builtins.html#builtins-filterSource",
|
||||
"#builtin-foldl-prime": "expressions/builtins.html#builtins-foldl-prime",
|
||||
"#builtin-fromJSON": "expressions/builtins.html#builtins-fromJSON",
|
||||
"#builtin-functionArgs": "expressions/builtins.html#builtins-functionArgs",
|
||||
"#builtin-genList": "expressions/builtins.html#builtins-genList",
|
||||
"#builtin-getAttr": "expressions/builtins.html#builtins-getAttr",
|
||||
"#builtin-getEnv": "expressions/builtins.html#builtins-getEnv",
|
||||
"#builtin-hasAttr": "expressions/builtins.html#builtins-hasAttr",
|
||||
"#builtin-hashFile": "expressions/builtins.html#builtins-hashFile",
|
||||
"#builtin-hashString": "expressions/builtins.html#builtins-hashString",
|
||||
"#builtin-head": "expressions/builtins.html#builtins-head",
|
||||
"#builtin-import": "expressions/builtins.html#builtins-import",
|
||||
"#builtin-intersectAttrs": "expressions/builtins.html#builtins-intersectAttrs",
|
||||
"#builtin-isAttrs": "expressions/builtins.html#builtins-isAttrs",
|
||||
"#builtin-isBool": "expressions/builtins.html#builtins-isBool",
|
||||
"#builtin-isFloat": "expressions/builtins.html#builtins-isFloat",
|
||||
"#builtin-isFunction": "expressions/builtins.html#builtins-isFunction",
|
||||
"#builtin-isInt": "expressions/builtins.html#builtins-isInt",
|
||||
"#builtin-isList": "expressions/builtins.html#builtins-isList",
|
||||
"#builtin-isNull": "expressions/builtins.html#builtins-isNull",
|
||||
"#builtin-isString": "expressions/builtins.html#builtins-isString",
|
||||
"#builtin-length": "expressions/builtins.html#builtins-length",
|
||||
"#builtin-lessThan": "expressions/builtins.html#builtins-lessThan",
|
||||
"#builtin-listToAttrs": "expressions/builtins.html#builtins-listToAttrs",
|
||||
"#builtin-map": "expressions/builtins.html#builtins-map",
|
||||
"#builtin-match": "expressions/builtins.html#builtins-match",
|
||||
"#builtin-mul": "expressions/builtins.html#builtins-mul",
|
||||
"#builtin-parseDrvName": "expressions/builtins.html#builtins-parseDrvName",
|
||||
"#builtin-path": "expressions/builtins.html#builtins-path",
|
||||
"#builtin-pathExists": "expressions/builtins.html#builtins-pathExists",
|
||||
"#builtin-placeholder": "expressions/builtins.html#builtins-placeholder",
|
||||
"#builtin-readDir": "expressions/builtins.html#builtins-readDir",
|
||||
"#builtin-readFile": "expressions/builtins.html#builtins-readFile",
|
||||
"#builtin-removeAttrs": "expressions/builtins.html#builtins-removeAttrs",
|
||||
"#builtin-replaceStrings": "expressions/builtins.html#builtins-replaceStrings",
|
||||
"#builtin-seq": "expressions/builtins.html#builtins-seq",
|
||||
"#builtin-sort": "expressions/builtins.html#builtins-sort",
|
||||
"#builtin-split": "expressions/builtins.html#builtins-split",
|
||||
"#builtin-splitVersion": "expressions/builtins.html#builtins-splitVersion",
|
||||
"#builtin-stringLength": "expressions/builtins.html#builtins-stringLength",
|
||||
"#builtin-sub": "expressions/builtins.html#builtins-sub",
|
||||
"#builtin-substring": "expressions/builtins.html#builtins-substring",
|
||||
"#builtin-tail": "expressions/builtins.html#builtins-tail",
|
||||
"#builtin-throw": "expressions/builtins.html#builtins-throw",
|
||||
"#builtin-toFile": "expressions/builtins.html#builtins-toFile",
|
||||
"#builtin-toJSON": "expressions/builtins.html#builtins-toJSON",
|
||||
"#builtin-toPath": "expressions/builtins.html#builtins-toPath",
|
||||
"#builtin-toString": "expressions/builtins.html#builtins-toString",
|
||||
"#builtin-toXML": "expressions/builtins.html#builtins-toXML",
|
||||
"#builtin-trace": "expressions/builtins.html#builtins-trace",
|
||||
"#builtin-tryEval": "expressions/builtins.html#builtins-tryEval",
|
||||
"#builtin-typeOf": "expressions/builtins.html#builtins-typeOf",
|
||||
"#ssec-builtins": "expressions/builtins.html",
|
||||
"#attr-system": "expressions/derivations.html#attr-system",
|
||||
"#ssec-derivation": "expressions/derivations.html",
|
||||
"#ch-expression-language": "expressions/expression-language.html",
|
||||
"#sec-expression-syntax": "expressions/expression-syntax.html",
|
||||
"#sec-generic-builder": "expressions/generic-builder.html",
|
||||
"#sec-constructs": "expressions/language-constructs.html",
|
||||
"#sect-let-expressions": "expressions/language-constructs.html#let-expressions",
|
||||
"#ss-functions": "expressions/language-constructs.html#functions",
|
||||
"#sec-language-operators": "expressions/language-operators.html",
|
||||
"#table-operators": "expressions/language-operators.html",
|
||||
"#ssec-values": "expressions/language-values.html",
|
||||
"#sec-building-simple": "expressions/simple-building-testing.html",
|
||||
"#ch-simple-expression": "expressions/simple-expression.html",
|
||||
"#chap-writing-nix-expressions": "expressions/writing-nix-expressions.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",
|
||||
|
|
|
|||
|
|
@ -26,21 +26,14 @@
|
|||
- [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)
|
||||
- [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)
|
||||
|
|
@ -66,6 +59,14 @@
|
|||
@manpages@
|
||||
- [Files](command-ref/files.md)
|
||||
- [nix.conf](command-ref/conf-file.md)
|
||||
<!--
|
||||
- [Architecture](architecture/architecture.md)
|
||||
- [Store](architecture/store/store.md)
|
||||
- [Closure](architecture/store/store/closure.md)
|
||||
- [Build system terminology](architecture/store/store/build-system-terminology.md)
|
||||
- [Store Path](architecture/store/path.md)
|
||||
- [File System Object](architecture/store/fso.md)
|
||||
-->
|
||||
- [Glossary](glossary.md)
|
||||
- [Contributing](contributing/contributing.md)
|
||||
- [Hacking](contributing/hacking.md)
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
|
|
|||
79
doc/manual/src/architecture/architecture.md
Normal file
79
doc/manual/src/architecture/architecture.md
Normal file
|
|
@ -0,0 +1,79 @@
|
|||
# Architecture
|
||||
|
||||
*(This chapter is unstable and a work in progress. Incoming links may rot.)*
|
||||
|
||||
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][layer-architecture].
|
||||
|
||||
```
|
||||
+-----------------------------------------------------------------+
|
||||
| Nix |
|
||||
| [ commmand line interface ]------, |
|
||||
| | | |
|
||||
| evaluates | |
|
||||
| | manages |
|
||||
| V | |
|
||||
| [ configuration language ] | |
|
||||
| | | |
|
||||
| +-----------------------------|-------------------V-----------+ |
|
||||
| | store evaluates to | |
|
||||
| | | | |
|
||||
| | referenced by V builds | |
|
||||
| | [ build input ] ---> [ build plan ] ---> [ build result ] | |
|
||||
| | | |
|
||||
| +-------------------------------------------------------------+ |
|
||||
+-----------------------------------------------------------------+
|
||||
```
|
||||
|
||||
At the top is the [command line interface](../command-ref/command-ref.md), translating from invocations of Nix executables to interactions with the underlying layers.
|
||||
|
||||
Below that is the [Nix expression language](../expressions/expression-language.md), a [purely functional][purely-functional-programming] configuration language.
|
||||
It is used to compose expressions which ultimately evaluate to self-contained *build plans*, used to derive *build results* from referenced *build inputs*.
|
||||
|
||||
The command line and Nix language are what users interact 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 these is the [Nix store](./store/store.md), a mechanism to keep track of build plans, data, and references between them.
|
||||
It can also execute build plans to produce new data.
|
||||
|
||||
A build plan is a series of *build tasks*.
|
||||
Each build task has a special build input which is used as *build instructions*.
|
||||
The result of a build task can be input to another build task.
|
||||
|
||||
```
|
||||
+-----------------------------------------------------------------------------------------+
|
||||
| store |
|
||||
| ................................................. |
|
||||
| : build plan : |
|
||||
| : : |
|
||||
| [ build input ]-----instructions-, : |
|
||||
| : | : |
|
||||
| : v : |
|
||||
| [ build input ]----------->[ build task ]--instructions-, : |
|
||||
| : | : |
|
||||
| : | : |
|
||||
| : v : |
|
||||
| : [ build task ]----->[ build result ] |
|
||||
| [ build input ]-----instructions-, ^ : |
|
||||
| : | | : |
|
||||
| : v | : |
|
||||
| [ build input ]----------->[ build task ]---------------' : |
|
||||
| : ^ : |
|
||||
| : | : |
|
||||
| [ build input ]------------------' : |
|
||||
| : : |
|
||||
| : : |
|
||||
| :...............................................: |
|
||||
| |
|
||||
+-----------------------------------------------------------------------------------------+
|
||||
```
|
||||
|
||||
[layer-architecture]: https://en.m.wikipedia.org/wiki/Multitier_architecture#Layers
|
||||
[purely-functional-programming]: https://en.m.wikipedia.org/wiki/Purely_functional_programming
|
||||
69
doc/manual/src/architecture/store/fso.md
Normal file
69
doc/manual/src/architecture/store/fso.md
Normal file
|
|
@ -0,0 +1,69 @@
|
|||
# File System Object
|
||||
|
||||
The Nix store uses a simple file system model for the data it holds in [store objects](store.md#store-object).
|
||||
|
||||
Every file system object is one of the following:
|
||||
|
||||
- File: an executable flag, and arbitrary data for contents
|
||||
- Directory: mapping of names to child file system objects
|
||||
- [Symbolic link][symlink]: may point anywhere.
|
||||
|
||||
We call a store object's outermost file system object the *root*.
|
||||
|
||||
data FileSystemObject
|
||||
= File { isExecutable :: Bool, contents :: Bytes }
|
||||
| Directory { entries :: Map FileName FileSystemObject }
|
||||
| SymLink { target :: Path }
|
||||
|
||||
Examples:
|
||||
|
||||
- a directory with contents
|
||||
|
||||
/nix/store/<hash>-hello-2.10
|
||||
├── bin
|
||||
│ └── hello
|
||||
└── share
|
||||
├── info
|
||||
│ └── hello.info
|
||||
└── man
|
||||
└── man1
|
||||
└── hello.1.gz
|
||||
|
||||
- a directory with relative symlink and other contents
|
||||
|
||||
/nix/store/<hash>-go-1.16.9
|
||||
├── bin -> share/go/bin
|
||||
├── nix-support/
|
||||
└── share/
|
||||
|
||||
- a directory with absolute symlink
|
||||
|
||||
/nix/store/d3k...-nodejs
|
||||
└── nix_node -> /nix/store/f20...-nodejs-10.24.
|
||||
|
||||
A bare file or symlink can be a root file system object.
|
||||
Examples:
|
||||
|
||||
/nix/store/<hash>-hello-2.10.tar.gz
|
||||
|
||||
/nix/store/4j5...-pkg-config-wrapper-0.29.2-doc -> /nix/store/i99...-pkg-config-0.29.2-doc
|
||||
|
||||
Symlinks pointing outside of their own root or to a store object without a matching reference are allowed, but might not function as intended.
|
||||
Examples:
|
||||
|
||||
- an arbitrarily symlinked file may change or not exist at all
|
||||
|
||||
/nix/store/<hash>-foo
|
||||
└── foo -> /home/foo
|
||||
|
||||
- if a symlink to a store path was not automatically created by Nix, it may be invalid or get invalidated when the store object is deleted
|
||||
|
||||
/nix/store/<hash>-bar
|
||||
└── bar -> /nix/store/abc...-foo
|
||||
|
||||
Nix file system objects do not support [hard links][hardlink]:
|
||||
each file system object which is not the root has exactly one parent and one name.
|
||||
However, as store objects are immutable, an underlying file system can use hard links for optimization.
|
||||
|
||||
[symlink]: https://en.m.wikipedia.org/wiki/Symbolic_link
|
||||
[hardlink]: https://en.m.wikipedia.org/wiki/Hard_link
|
||||
105
doc/manual/src/architecture/store/path.md
Normal file
105
doc/manual/src/architecture/store/path.md
Normal file
|
|
@ -0,0 +1,105 @@
|
|||
# Store Path
|
||||
|
||||
Nix implements [references](store.md#reference) to [store objects](store.md#store-object) as *store paths*.
|
||||
|
||||
Store paths are pairs of
|
||||
|
||||
- a 20-byte [digest](#digest) for identification
|
||||
- a symbolic name for people to read.
|
||||
|
||||
Example:
|
||||
|
||||
- digest: `b6gvzjyb2pg0kjfwrjmg1vfhh54ad73z`
|
||||
- name: `firefox-33.1`
|
||||
|
||||
It is rendered to a file system path as the concatenation of
|
||||
|
||||
- [store directory](#store-directory)
|
||||
- path-separator (`/`)
|
||||
- [digest](#digest) rendered in a custom variant of [base-32](https://en.m.wikipedia.org/wiki/Base32) (20 arbitrary bytes become 32 ASCII characters)
|
||||
- hyphen (`-`)
|
||||
- name
|
||||
|
||||
Example:
|
||||
|
||||
/nix/store/b6gvzjyb2pg0kjfwrjmg1vfhh54ad73z-firefox-33.1
|
||||
|--------| |------------------------------| |----------|
|
||||
store directory digest name
|
||||
|
||||
## Store Directory
|
||||
|
||||
Every [store](./store.md) has a store directory.
|
||||
|
||||
If the store has a [file system representation](./store.md#files-and-processes), this directory contains the store’s [file system objects](#file-system-object), which can be addressed by [store paths](#store-path).
|
||||
|
||||
This means a store path is not just derived from the referenced store object itself, but depends on the store the store object is in.
|
||||
|
||||
> **Note**
|
||||
> The store directory defaults to `/nix/store`, but is in principle arbitrary.
|
||||
|
||||
It is important which store a given store object belongs to:
|
||||
Files in the store object can contain store paths, and processes may read these paths.
|
||||
Nix can only guarantee [referential integrity](store/closure.md) if store paths do not cross store boundaries.
|
||||
|
||||
Therefore one can only copy store objects to a different store if
|
||||
|
||||
- the source and target stores' directories match
|
||||
|
||||
or
|
||||
|
||||
- the store object in question has no references, that is, contains no store paths.
|
||||
|
||||
One cannot copy a store object to a store with a different store directory.
|
||||
Instead, it has to be rebuilt, together with all its dependencies.
|
||||
It is in general not enough to replace the store directory string in file contents, as this may render executables unusable by invalidating their internal offsets or checksums.
|
||||
|
||||
# Digest
|
||||
|
||||
In a [store path](#store-path), the [digest][digest] is the output of a [cryptographic hash function][hash] of either all *inputs* involved in building the referenced store object or its actual *contents*.
|
||||
|
||||
Store objects are therefore said to be either [input-addressed](#input-addressing) or [content-addressed](#content-addressing).
|
||||
|
||||
> **Historical Note**
|
||||
> The 20 byte restriction is because originally digests were [SHA-1][sha-1] hashes.
|
||||
> Nix now uses [SHA-256][sha-256], and longer hashes are still reduced to 20 bytes for compatibility.
|
||||
|
||||
[digest]: https://en.m.wiktionary.org/wiki/digest#Noun
|
||||
[hash]: https://en.m.wikipedia.org/wiki/Cryptographic_hash_function
|
||||
[sha-1]: https://en.m.wikipedia.org/wiki/SHA-1
|
||||
[sha-256]: https://en.m.wikipedia.org/wiki/SHA-256
|
||||
|
||||
### Reference scanning
|
||||
|
||||
When a new store object is built, Nix scans its file contents for store paths to construct its set of references.
|
||||
|
||||
The special format of a store path's [digest](#digest) allows reliably detecting it among arbitrary data.
|
||||
Nix uses the [closure](store.md#closure) of build inputs to derive the list of allowed store paths, to avoid false positives.
|
||||
|
||||
This way, scanning files captures run time dependencies without the user having to declare them explicitly.
|
||||
Doing it at build time and persisting references in the store object avoids repeating this time-consuming operation.
|
||||
|
||||
> **Note**
|
||||
> In practice, it is sometimes still necessary for users to declare certain dependencies explicitly, if they are to be preserved in the build result's closure.
|
||||
This depends on the specifics of the software to build and run.
|
||||
>
|
||||
> For example, Java programs are compressed after compilation, which obfuscates any store paths they may refer to and prevents Nix from automatically detecting them.
|
||||
|
||||
## Input Addressing
|
||||
|
||||
Input addressing means that the digest derives from how the store object was produced, namely its build inputs and build plan.
|
||||
|
||||
To compute the hash of a store object one needs a deterministic serialisation, i.e., a binary string representation which only changes if the store object changes.
|
||||
|
||||
Nix has a custom serialisation format called Nix Archive (NAR)
|
||||
|
||||
Store object references of this sort can *not* be validated from the content of the store object.
|
||||
Rather, a cryptographic signature has to be used to indicate that someone is vouching for the store object really being produced from a build plan with that digest.
|
||||
|
||||
## Content Addressing
|
||||
|
||||
Content addressing means that the digest derives from the store object's contents, namely its file system objects and references.
|
||||
If one knows content addressing was used, one can recalculate the reference and thus verify the store object.
|
||||
|
||||
Content addressing is currently only used for the special cases of source files and "fixed-output derivations", where the contents of a store object are known in advance.
|
||||
Content addressing of build results is still an [experimental feature subject to some restrictions](https://github.com/tweag/rfcs/blob/cas-rfc/rfcs/0062-content-addressed-paths.md).
|
||||
|
||||
151
doc/manual/src/architecture/store/store.md
Normal file
151
doc/manual/src/architecture/store/store.md
Normal file
|
|
@ -0,0 +1,151 @@
|
|||
# Store
|
||||
|
||||
A Nix store is a collection of *store objects* with references between them.
|
||||
It supports operations to manipulate that collection.
|
||||
|
||||
The following concept map is a graphical outline of this chapter.
|
||||
Arrows indicate suggested reading order.
|
||||
|
||||
```
|
||||
,--------------[ store ]----------------,
|
||||
| | |
|
||||
v v v
|
||||
[ store object ] [ closure ]--, [ operations ]
|
||||
| | | | | |
|
||||
v | | v v |
|
||||
[ files and processes ] | | [ garbage collection ] |
|
||||
/ \ | | |
|
||||
v v | v v
|
||||
[ file system object ] [ store path ] | [ derivation ]--->[ building ]
|
||||
| ^ | | |
|
||||
v | v v |
|
||||
[ digest ]----' [ reference scanning ]<------------'
|
||||
/ \
|
||||
v v
|
||||
[ input addressing ] [ content addressing ]
|
||||
```
|
||||
|
||||
## Store Object
|
||||
|
||||
A store object can hold
|
||||
|
||||
- arbitrary *data*
|
||||
- *references* to other store objects.
|
||||
|
||||
Store objects can be build inputs, build results, or build tasks.
|
||||
|
||||
Store objects are [immutable][immutable-object]: once created, they do not change until they are deleted.
|
||||
|
||||
## Reference
|
||||
|
||||
A store object reference is an [opaque][opaque-data-type], [unique identifier][unique-identifier]:
|
||||
The only way to obtain references is by adding or building store objects.
|
||||
A reference will always point to exactly one store object.
|
||||
|
||||
## Operations
|
||||
|
||||
A Nix store can *add*, *retrieve*, and *delete* store objects.
|
||||
|
||||
[ data ]
|
||||
|
|
||||
V
|
||||
[ store ] ---> add ----> [ store' ]
|
||||
|
|
||||
V
|
||||
[ reference ]
|
||||
|
||||
<!-- -->
|
||||
|
||||
[ reference ]
|
||||
|
|
||||
V
|
||||
[ store ] ---> get
|
||||
|
|
||||
V
|
||||
[ store object ]
|
||||
|
||||
<!-- -->
|
||||
|
||||
[ reference ]
|
||||
|
|
||||
V
|
||||
[ store ] --> delete --> [ store' ]
|
||||
|
||||
|
||||
It can *perform builds*, that is, create new store objects by transforming build inputs into build outputs, using instructions from the build tasks.
|
||||
|
||||
|
||||
[ reference ]
|
||||
|
|
||||
V
|
||||
[ store ] --> build --(maybe)--> [ store' ]
|
||||
|
|
||||
V
|
||||
[ reference ]
|
||||
|
||||
|
||||
As it keeps track of references, it can [garbage-collect][garbage-collection] unused store objects.
|
||||
|
||||
|
||||
[ store ] --> collect garbage --> [ store' ]
|
||||
|
||||
## Files and Processes
|
||||
|
||||
Nix maps between its store model and the [Unix paradigm][unix-paradigm] of [files and processes][file-descriptor], by encoding immutable store objects and opaque identifiers as file system primitives: files and directories, and paths.
|
||||
That allows processes to resolve references contained in files and thus access the contents of store objects.
|
||||
|
||||
Store objects are therefore implemented as the pair of
|
||||
|
||||
- a [file system object](fso.md) for data
|
||||
- a set of [store paths](path.md) for references.
|
||||
|
||||
[unix-paradigm]: https://en.m.wikipedia.org/wiki/Everything_is_a_file
|
||||
[file-descriptor]: https://en.m.wikipedia.org/wiki/File_descriptor
|
||||
|
||||
The following diagram shows a radical simplification of how Nix interacts with the operating system:
|
||||
It uses files as build inputs, and build outputs are files again.
|
||||
On the operating system, files can be run as processes, which in turn operate on files.
|
||||
A build function also amounts to an operating system process (not depicted).
|
||||
|
||||
```
|
||||
+-----------------------------------------------------------------+
|
||||
| Nix |
|
||||
| [ commmand line interface ]------, |
|
||||
| | | |
|
||||
| evaluates | |
|
||||
| | manages |
|
||||
| V | |
|
||||
| [ configuration language ] | |
|
||||
| | | |
|
||||
| +-----------------------------|-------------------V-----------+ |
|
||||
| | store evaluates to | |
|
||||
| | | | |
|
||||
| | referenced by V builds | |
|
||||
| | [ build input ] ---> [ build plan ] ---> [ build result ] | |
|
||||
| | ^ | | |
|
||||
| +---------|----------------------------------------|----------+ |
|
||||
+-----------|----------------------------------------|------------+
|
||||
| |
|
||||
file system object store path
|
||||
| |
|
||||
+-----------|----------------------------------------|------------+
|
||||
| operating system +------------+ | |
|
||||
| '------------ | | <-----------' |
|
||||
| | file | |
|
||||
| ,-- | | <-, |
|
||||
| | +------------+ | |
|
||||
| execute as | | read, write, execute |
|
||||
| | +------------+ | |
|
||||
| '-> | process | --' |
|
||||
| +------------+ |
|
||||
+-----------------------------------------------------------------+
|
||||
```
|
||||
|
||||
There exist different types of stores, which all follow this model.
|
||||
Examples:
|
||||
- store on the local file system
|
||||
- remote store accessible via SSH
|
||||
- binary cache store accessible via HTTP
|
||||
|
||||
To make store objects accessible to processes, stores ultimately have to expose store objects through the file system.
|
||||
|
||||
|
|
@ -0,0 +1,32 @@
|
|||
# A [Rosetta stone][rosetta-stone] for build system terminology
|
||||
|
||||
The Nix store's design is comparable to other build systems.
|
||||
Usage of terms is, for historic reasons, not entirely consistent within the Nix ecosystem, and still subject to slow change.
|
||||
|
||||
The following translation table points out similarities and equivalent terms, to help clarify their meaning and inform consistent use in the future.
|
||||
|
||||
| generic build system | Nix | [Bazel][bazel] | [Build Systems à la Carte][bsalc] | programming language |
|
||||
| -------------------------------- | ---------------- | -------------------------------------------------------------------- | --------------------------------- | ------------------------ |
|
||||
| data (build input, build result) | store object | [artifact][bazel-artifact] | value | value |
|
||||
| build instructions | builder | ([depends on action type][bazel-actions]) | function | function |
|
||||
| build task | derivation | [action][bazel-action] | `Task` | [thunk][thunk] |
|
||||
| build plan | derivation graph | [action graph][bazel-action-graph], [build graph][bazel-build-graph] | `Tasks` | [call graph][call-graph] |
|
||||
| build | build | build | application of `Build` | evaluation |
|
||||
| persistence layer | store | [action cache][bazel-action-cache] | `Store` | heap |
|
||||
|
||||
All of these systems share features of [declarative programming][declarative-programming] languages, a key insight first put forward by Eelco Dolstra et al. in [Imposing a Memory Management Discipline on Software Deployment][immdsd] (2004), elaborated in his PhD thesis [The Purely Functional Software Deployment Model][phd-thesis] (2006), and further refined by Andrey Mokhov et al. in [Build Systems à la Carte][bsalc] (2018).
|
||||
|
||||
[rosetta-stone]: https://en.m.wikipedia.org/wiki/Rosetta_Stone
|
||||
[bazel]: https://bazel.build/start/bazel-intro
|
||||
[bazel-artifact]: https://bazel.build/reference/glossary#artifact
|
||||
[bazel-actions]: https://docs.bazel.build/versions/main/skylark/lib/actions.html
|
||||
[bazel-action]: https://bazel.build/reference/glossary#action
|
||||
[bazel-action-graph]: https://bazel.build/reference/glossary#action-graph
|
||||
[bazel-build-graph]: https://bazel.build/reference/glossary#build-graph
|
||||
[bazel-action-cache]: https://bazel.build/reference/glossary#action-cache
|
||||
[thunk]: https://en.m.wikipedia.org/wiki/Thunk
|
||||
[call-graph]: https://en.m.wikipedia.org/wiki/Call_graph
|
||||
[declarative-programming]: https://en.m.wikipedia.org/wiki/Declarative_programming
|
||||
[immdsd]: https://edolstra.github.io/pubs/immdsd-icse2004-final.pdf
|
||||
[phd-thesis]: https://edolstra.github.io/pubs/phd-thesis.pdf
|
||||
[bsalc]: https://www.microsoft.com/en-us/research/uploads/prod/2018/03/build-systems.pdf
|
||||
29
doc/manual/src/architecture/store/store/closure.md
Normal file
29
doc/manual/src/architecture/store/store/closure.md
Normal file
|
|
@ -0,0 +1,29 @@
|
|||
# Closure
|
||||
|
||||
Nix stores ensure [referential integrity][referential-integrity]: for each store object in the store, all the store objects it references must also be in the store.
|
||||
|
||||
The set of all store objects reachable by following references from a given initial set of store objects is called a *closure*.
|
||||
|
||||
Adding, building, copying and deleting store objects must be done in a way that preserves referential integrity:
|
||||
|
||||
- A newly added store object cannot have references, unless it is a build task.
|
||||
|
||||
- Build results must only refer to store objects in the closure of the build inputs.
|
||||
|
||||
Building a store object will add appropriate references, according to the build task.
|
||||
|
||||
- Store objects being copied must refer to objects already in the destination store.
|
||||
|
||||
Recursive copying must either proceed in dependency order or be atomic.
|
||||
|
||||
- We can only safely delete store objects which are not reachable from any reference still in use.
|
||||
|
||||
<!-- more details in section on garbage collection, link to it once it exists -->
|
||||
|
||||
[referential-integrity]: https://en.m.wikipedia.org/wiki/Referential_integrity
|
||||
[garbage-collection]: https://en.m.wikipedia.org/wiki/Garbage_collection_(computer_science)
|
||||
[immutable-object]: https://en.m.wikipedia.org/wiki/Immutable_object
|
||||
[opaque-data-type]: https://en.m.wikipedia.org/wiki/Opaque_data_type
|
||||
[unique-identifier]: https://en.m.wikipedia.org/wiki/Unique_identifier
|
||||
|
||||
|
||||
|
|
@ -198,7 +198,7 @@ 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
|
||||
|
|
|
|||
|
|
@ -51,7 +51,7 @@ 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 +66,7 @@ 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
|
||||
|
|
|
|||
|
|
@ -121,7 +121,7 @@ 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
|
||||
|
|
|
|||
|
|
@ -145,7 +145,7 @@ Most Nix commands accept the following command-line options:
|
|||
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
|
||||
|
|
@ -164,7 +164,7 @@ 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
|
||||
|
|
|
|||
|
|
@ -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.
|
||||
|
|
@ -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.
|
||||
|
|
@ -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.
|
||||
|
|
@ -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 $stdenv/setup
|
||||
genericBuild
|
||||
```
|
||||
|
||||
In fact, `mkDerivation` provides a default builder that looks exactly
|
||||
like that, so it is actually possible to omit the builder for Hello
|
||||
entirely.
|
||||
|
|
@ -1,251 +0,0 @@
|
|||
# Values
|
||||
|
||||
## Simple Values
|
||||
|
||||
Nix has the following basic data types:
|
||||
|
||||
- *Strings* can be written in three ways.
|
||||
|
||||
The most common way is to enclose the string between double quotes,
|
||||
e.g., `"foo bar"`. Strings can span multiple lines. The special
|
||||
characters `"` and `\` and the character sequence `${` 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.
|
||||
|
|
@ -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`).
|
||||
|
|
@ -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.
|
||||
|
|
@ -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/).
|
||||
|
|
@ -3,7 +3,7 @@
|
|||
- [derivation]{#gloss-derivation}\
|
||||
A description of a build action. 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`).
|
||||
|
||||
|
|
|
|||
|
|
@ -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).
|
||||
|
|
@ -148,7 +148,8 @@ 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 +168,7 @@ and `/etc/zshrc` which you may remove.
|
|||
removed next.
|
||||
|
||||
7. Remove the Nix Store volume:
|
||||
|
||||
|
||||
```console
|
||||
sudo diskutil apfs deleteVolume /nix
|
||||
```
|
||||
|
|
@ -175,8 +176,20 @@ 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.
|
||||
|
|
@ -191,8 +204,7 @@ and `/etc/zshrc` which you may remove.
|
|||
<!-- 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
|
||||
|
|
|
|||
|
|
@ -1,6 +1,6 @@
|
|||
# Nix Expression Language
|
||||
# Nix Language
|
||||
|
||||
The Nix expression language is a pure, lazy, functional language. Purity
|
||||
The Nix 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.
|
||||
|
|
@ -10,3 +10,4 @@ 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.
|
||||
|
||||
|
|
@ -1,6 +1,6 @@
|
|||
# Operators
|
||||
|
||||
The table below lists the operators in the Nix expression language, in
|
||||
The table below lists the operators in the Nix language, in
|
||||
order of precedence (from strongest to weakest binding).
|
||||
|
||||
| Name | Syntax | Associativity | Description | Precedence |
|
||||
261
doc/manual/src/language/values.md
Normal file
261
doc/manual/src/language/values.md
Normal file
|
|
@ -0,0 +1,261 @@
|
|||
# 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 `${` must be
|
||||
escaped by prefixing them with a backslash (`\`). Newlines, carriage
|
||||
returns and tabs can be written as `\n`, `\r` and `\t`,
|
||||
respectively.
|
||||
|
||||
You can include the result of an expression into a string by
|
||||
enclosing it in `${...}`, 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`.
|
||||
|
||||
- <a id="type-number" href="#type-number">Number</a>
|
||||
|
||||
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.
|
||||
|
||||
- <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.
|
||||
|
||||
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.
|
||||
|
||||
- <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
|
||||
{ "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
|
||||
{ ${if foo then "bar" else null} = true; }
|
||||
```
|
||||
|
||||
This will evaluate to `{}` if `foo` evaluates to `false`.
|
||||
|
||||
A set that has a `__functor` attribute whose value is callable (i.e. is
|
||||
itself a function or a set with a `__functor` attribute whose value is
|
||||
callable) can be applied as if it were a function, with the set itself
|
||||
passed in first , e.g.,
|
||||
|
||||
```nix
|
||||
let add = { __functor = self: x: x + self.x; };
|
||||
inc = add // { x = 1; };
|
||||
in inc 1
|
||||
```
|
||||
|
||||
evaluates to `2`. This can be used to attach metadata to a function
|
||||
without the caller needing to treat it specially, or to implement a form
|
||||
of object-oriented programming, for example.
|
||||
|
|
@ -1,5 +1,4 @@
|
|||
This chapter discusses how to do package management with Nix, i.e.,
|
||||
how to obtain, install, upgrade, and erase packages. This is the
|
||||
“user’s” perspective of the Nix system — people who want to *create*
|
||||
packages should consult the [chapter on writing Nix
|
||||
expressions](../expressions/writing-nix-expressions.md).
|
||||
packages should consult the chapter on the [Nix language](../language/index.md).
|
||||
|
|
|
|||
12
docker.nix
12
docker.nix
|
|
@ -6,6 +6,7 @@
|
|||
, channelURL ? "https://nixos.org/channels/nixpkgs-unstable"
|
||||
, extraPkgs ? []
|
||||
, maxLayers ? 100
|
||||
, nixConf ? {}
|
||||
}:
|
||||
let
|
||||
defaultPkgs = with pkgs; [
|
||||
|
|
@ -123,12 +124,17 @@ let
|
|||
(lib.attrValues (lib.mapAttrs groupToGroup groups))
|
||||
);
|
||||
|
||||
nixConf = {
|
||||
defaultNixConf = {
|
||||
sandbox = "false";
|
||||
build-users-group = "nixbld";
|
||||
trusted-public-keys = "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=";
|
||||
trusted-public-keys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
|
||||
};
|
||||
nixConfContents = (lib.concatStringsSep "\n" (lib.mapAttrsFlatten (n: v: "${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} = ${vStr}") (defaultNixConf // nixConf))) + "\n";
|
||||
|
||||
baseSystem =
|
||||
let
|
||||
|
|
|
|||
|
|
@ -59,6 +59,30 @@ headless() {
|
|||
fi
|
||||
}
|
||||
|
||||
is_root() {
|
||||
if [ "$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 ""
|
||||
|
|
@ -313,14 +337,23 @@ __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"
|
||||
}
|
||||
|
|
@ -423,7 +456,7 @@ EOF
|
|||
fi
|
||||
done
|
||||
|
||||
if [ "$(uname -s)" = "Linux" ] && [ ! -e /run/systemd/system ]; then
|
||||
if is_os_linux && [ ! -e /run/systemd/system ]; then
|
||||
warning <<EOF
|
||||
We did not detect systemd on your system. With a multi-user install
|
||||
without systemd you will have to manually configure your init system to
|
||||
|
|
@ -640,7 +673,7 @@ place_channel_configuration() {
|
|||
|
||||
check_selinux() {
|
||||
if command -v getenforce > /dev/null 2>&1; then
|
||||
if ! [ "$(getenforce)" = "Disabled" ]; then
|
||||
if [ "$(getenforce)" = "Enforcing" ]; then
|
||||
failure <<EOF
|
||||
Nix does not work with selinux enabled yet!
|
||||
see https://github.com/NixOS/nix/issues/2374
|
||||
|
|
@ -865,24 +898,14 @@ EOF
|
|||
install -m 0664 "$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 [ "$EUID" -eq 0 ]; then
|
||||
failure <<EOF
|
||||
Please do not run this script with root privileges. I will call sudo
|
||||
when I need to.
|
||||
EOF
|
||||
fi
|
||||
|
||||
main() {
|
||||
check_selinux
|
||||
|
||||
if [ "$(uname -s)" = "Darwin" ]; then
|
||||
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
|
||||
|
|
@ -890,7 +913,10 @@ 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
|
||||
|
|
|
|||
|
|
@ -616,6 +616,8 @@ 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();
|
||||
|
|
|
|||
|
|
@ -35,6 +35,7 @@ extern "C" {
|
|||
#include "finally.hh"
|
||||
#include "markdown.hh"
|
||||
#include "local-fs-store.hh"
|
||||
#include "progress-bar.hh"
|
||||
|
||||
#if HAVE_BOEHMGC
|
||||
#define GC_INCLUDE_NEW
|
||||
|
|
@ -252,6 +253,10 @@ void NixRepl::mainLoop()
|
|||
rl_set_list_possib_func(listPossibleCallback);
|
||||
#endif
|
||||
|
||||
/* Stop the progress bar because it interferes with the display of
|
||||
the repl. */
|
||||
stopProgressBar();
|
||||
|
||||
std::string input;
|
||||
|
||||
while (true) {
|
||||
|
|
@ -1037,9 +1042,10 @@ void runRepl(
|
|||
|
||||
struct CmdRepl : InstallablesCommand
|
||||
{
|
||||
CmdRepl(){
|
||||
CmdRepl() {
|
||||
evalSettings.pureEval = false;
|
||||
}
|
||||
|
||||
void prepare()
|
||||
{
|
||||
if (!settings.isExperimentalFeatureEnabled(Xp::ReplFlake) && !(file) && this->_installables.size() >= 1) {
|
||||
|
|
@ -1053,12 +1059,15 @@ struct CmdRepl : InstallablesCommand
|
|||
}
|
||||
installables = InstallablesCommand::load();
|
||||
}
|
||||
|
||||
std::vector<std::string> files;
|
||||
|
||||
Strings getDefaultFlakeAttrPaths() override
|
||||
{
|
||||
return {""};
|
||||
}
|
||||
virtual bool useDefaultInstallables() override
|
||||
|
||||
bool useDefaultInstallables() override
|
||||
{
|
||||
return file.has_value() or expr.has_value();
|
||||
}
|
||||
|
|
|
|||
|
|
@ -2501,18 +2501,18 @@ void EvalState::printStats()
|
|||
}
|
||||
{
|
||||
auto list = topObj.list("functions");
|
||||
for (auto & i : functionCalls) {
|
||||
for (auto & [fun, count] : functionCalls) {
|
||||
auto obj = list.object();
|
||||
if (i.first->name)
|
||||
obj.attr("name", (const std::string &) i.first->name);
|
||||
if (fun->name)
|
||||
obj.attr("name", (std::string_view) symbols[fun->name]);
|
||||
else
|
||||
obj.attr("name", nullptr);
|
||||
if (auto pos = positions[i.first->pos]) {
|
||||
obj.attr("file", (const std::string &) pos.file);
|
||||
if (auto pos = positions[fun->pos]) {
|
||||
obj.attr("file", (std::string_view) pos.file);
|
||||
obj.attr("line", pos.line);
|
||||
obj.attr("column", pos.column);
|
||||
}
|
||||
obj.attr("count", i.second);
|
||||
obj.attr("count", count);
|
||||
}
|
||||
}
|
||||
{
|
||||
|
|
|
|||
|
|
@ -341,7 +341,6 @@ LockedFlake lockFlake(
|
|||
|
||||
debug("old lock file: %s", oldLockFile);
|
||||
|
||||
// FIXME: check whether all overrides are used.
|
||||
std::map<InputPath, FlakeInput> overrides;
|
||||
std::set<InputPath> overridesUsed, updatesUsed;
|
||||
|
||||
|
|
|
|||
|
|
@ -28,7 +28,7 @@ typedef std::string FlakeId;
|
|||
* object that fetcher generates (usually via
|
||||
* FlakeRef::fromAttrs(attrs) or parseFlakeRef(url) calls).
|
||||
*
|
||||
* The actual fetch not have been performed yet (i.e. a FlakeRef may
|
||||
* The actual fetch may not have been performed yet (i.e. a FlakeRef may
|
||||
* be lazy), but the fetcher can be invoked at any time via the
|
||||
* FlakeRef to ensure the store is populated with this input.
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -370,7 +370,7 @@ struct GitInputScheme : InputScheme
|
|||
auto gitDir = ".git";
|
||||
|
||||
runProgram("git", true,
|
||||
{ "-C", *sourcePath, "--git-dir", gitDir, "add", "--force", "--intent-to-add", "--", std::string(file) });
|
||||
{ "-C", *sourcePath, "--git-dir", gitDir, "add", "--intent-to-add", "--", std::string(file) });
|
||||
|
||||
if (commitMsg)
|
||||
runProgram("git", true,
|
||||
|
|
|
|||
|
|
@ -8,6 +8,7 @@
|
|||
#include <map>
|
||||
#include <thread>
|
||||
#include <iostream>
|
||||
#include <chrono>
|
||||
|
||||
namespace nix {
|
||||
|
||||
|
|
@ -48,6 +49,7 @@ private:
|
|||
bool visible = true;
|
||||
ActivityId parent;
|
||||
std::optional<std::string> name;
|
||||
std::chrono::time_point<std::chrono::steady_clock> startTime;
|
||||
};
|
||||
|
||||
struct ActivitiesByType
|
||||
|
|
@ -91,10 +93,11 @@ public:
|
|||
state_.lock()->active = isTTY;
|
||||
updateThread = std::thread([&]() {
|
||||
auto state(state_.lock());
|
||||
auto nextWakeup = std::chrono::milliseconds::max();
|
||||
while (state->active) {
|
||||
if (!state->haveUpdate)
|
||||
state.wait(updateCV);
|
||||
draw(*state);
|
||||
state.wait_for(updateCV, nextWakeup);
|
||||
nextWakeup = draw(*state);
|
||||
state.wait_for(quitCV, std::chrono::milliseconds(50));
|
||||
}
|
||||
});
|
||||
|
|
@ -118,7 +121,8 @@ public:
|
|||
updateThread.join();
|
||||
}
|
||||
|
||||
bool isVerbose() override {
|
||||
bool isVerbose() override
|
||||
{
|
||||
return printBuildLogs;
|
||||
}
|
||||
|
||||
|
|
@ -159,11 +163,13 @@ public:
|
|||
if (lvl <= verbosity && !s.empty() && type != actBuildWaiting)
|
||||
log(*state, lvl, s + "...");
|
||||
|
||||
state->activities.emplace_back(ActInfo());
|
||||
state->activities.emplace_back(ActInfo {
|
||||
.s = s,
|
||||
.type = type,
|
||||
.parent = parent,
|
||||
.startTime = std::chrono::steady_clock::now()
|
||||
});
|
||||
auto i = std::prev(state->activities.end());
|
||||
i->s = s;
|
||||
i->type = type;
|
||||
i->parent = parent;
|
||||
state->its.emplace(act, i);
|
||||
state->activitiesByType[type].its.emplace(act, i);
|
||||
|
||||
|
|
@ -327,10 +333,12 @@ public:
|
|||
updateCV.notify_one();
|
||||
}
|
||||
|
||||
void draw(State & state)
|
||||
std::chrono::milliseconds draw(State & state)
|
||||
{
|
||||
auto nextWakeup = std::chrono::milliseconds::max();
|
||||
|
||||
state.haveUpdate = false;
|
||||
if (!state.active) return;
|
||||
if (!state.active) return nextWakeup;
|
||||
|
||||
std::string line;
|
||||
|
||||
|
|
@ -341,12 +349,25 @@ public:
|
|||
line += "]";
|
||||
}
|
||||
|
||||
auto now = std::chrono::steady_clock::now();
|
||||
|
||||
if (!state.activities.empty()) {
|
||||
if (!status.empty()) line += " ";
|
||||
auto i = state.activities.rbegin();
|
||||
|
||||
while (i != state.activities.rend() && (!i->visible || (i->s.empty() && i->lastLine.empty())))
|
||||
while (i != state.activities.rend()) {
|
||||
if (i->visible && (!i->s.empty() || !i->lastLine.empty())) {
|
||||
/* Don't show activities until some time has
|
||||
passed, to avoid displaying very short
|
||||
activities. */
|
||||
auto delay = std::chrono::milliseconds(10);
|
||||
if (i->startTime + delay < now)
|
||||
break;
|
||||
else
|
||||
nextWakeup = std::min(nextWakeup, std::chrono::duration_cast<std::chrono::milliseconds>(delay - (now - i->startTime)));
|
||||
}
|
||||
++i;
|
||||
}
|
||||
|
||||
if (i != state.activities.rend()) {
|
||||
line += i->s;
|
||||
|
|
@ -366,6 +387,8 @@ public:
|
|||
if (width <= 0) width = std::numeric_limits<decltype(width)>::max();
|
||||
|
||||
writeToStderr("\r" + filterANSIEscapes(line, false, width) + ANSI_NORMAL + "\e[K");
|
||||
|
||||
return nextWakeup;
|
||||
}
|
||||
|
||||
std::string getStatus(State & state)
|
||||
|
|
|
|||
|
|
@ -705,8 +705,7 @@ static void movePath(const Path & src, const Path & dst)
|
|||
if (changePerm)
|
||||
chmod_(src, st.st_mode | S_IWUSR);
|
||||
|
||||
if (rename(src.c_str(), dst.c_str()))
|
||||
throw SysError("renaming '%1%' to '%2%'", src, dst);
|
||||
renameFile(src, dst);
|
||||
|
||||
if (changePerm)
|
||||
chmod_(dst, st.st_mode);
|
||||
|
|
@ -914,12 +913,6 @@ void DerivationGoal::buildDone()
|
|||
outputPaths
|
||||
);
|
||||
|
||||
if (buildMode == bmCheck) {
|
||||
cleanupPostOutputsRegisteredModeCheck();
|
||||
done(BuildResult::Built, std::move(builtOutputs));
|
||||
return;
|
||||
}
|
||||
|
||||
cleanupPostOutputsRegisteredModeNonCheck();
|
||||
|
||||
/* Repeat the build if necessary. */
|
||||
|
|
|
|||
|
|
@ -223,8 +223,7 @@ static void movePath(const Path & src, const Path & dst)
|
|||
if (changePerm)
|
||||
chmod_(src, st.st_mode | S_IWUSR);
|
||||
|
||||
if (rename(src.c_str(), dst.c_str()))
|
||||
throw SysError("renaming '%1%' to '%2%'", src, dst);
|
||||
renameFile(src, dst);
|
||||
|
||||
if (changePerm)
|
||||
chmod_(dst, st.st_mode);
|
||||
|
|
@ -311,7 +310,7 @@ bool LocalDerivationGoal::cleanupDecideWhetherDiskFull()
|
|||
if (buildMode != bmCheck && status.known->isValid()) continue;
|
||||
auto p = worker.store.printStorePath(status.known->path);
|
||||
if (pathExists(chrootRootDir + p))
|
||||
rename((chrootRootDir + p).c_str(), p.c_str());
|
||||
renameFile((chrootRootDir + p), p);
|
||||
}
|
||||
|
||||
return diskFull;
|
||||
|
|
@ -845,18 +844,43 @@ void LocalDerivationGoal::startBuilder()
|
|||
/* Some distros patch Linux to not allow unprivileged
|
||||
* user namespaces. If we get EPERM or EINVAL, try
|
||||
* without CLONE_NEWUSER and see if that works.
|
||||
* Details: https://salsa.debian.org/kernel-team/linux/-/commit/d98e00eda6bea437e39b9e80444eee84a32438a6
|
||||
*/
|
||||
usingUserNamespace = false;
|
||||
flags &= ~CLONE_NEWUSER;
|
||||
child = clone(childEntry, stack + stackSize, flags, this);
|
||||
}
|
||||
/* Otherwise exit with EPERM so we can handle this in the
|
||||
parent. This is only done when sandbox-fallback is set
|
||||
to true (the default). */
|
||||
if (child == -1 && (errno == EPERM || errno == EINVAL) && settings.sandboxFallback)
|
||||
_exit(1);
|
||||
if (child == -1) throw SysError("cloning builder process");
|
||||
|
||||
if (child == -1) {
|
||||
switch(errno) {
|
||||
case EPERM:
|
||||
case EINVAL: {
|
||||
int errno_ = errno;
|
||||
if (!userNamespacesEnabled && errno==EPERM)
|
||||
notice("user namespaces appear to be disabled; they are required for sandboxing; check /proc/sys/user/max_user_namespaces");
|
||||
if (userNamespacesEnabled) {
|
||||
Path procSysKernelUnprivilegedUsernsClone = "/proc/sys/kernel/unprivileged_userns_clone";
|
||||
if (pathExists(procSysKernelUnprivilegedUsernsClone)
|
||||
&& trim(readFile(procSysKernelUnprivilegedUsernsClone)) == "0") {
|
||||
notice("user namespaces appear to be disabled; they are required for sandboxing; check /proc/sys/kernel/unprivileged_userns_clone");
|
||||
}
|
||||
}
|
||||
Path procSelfNsUser = "/proc/self/ns/user";
|
||||
if (!pathExists(procSelfNsUser))
|
||||
notice("/proc/self/ns/user does not exist; your kernel was likely built without CONFIG_USER_NS=y, which is required for sandboxing");
|
||||
/* Otherwise exit with EPERM so we can handle this in the
|
||||
parent. This is only done when sandbox-fallback is set
|
||||
to true (the default). */
|
||||
if (settings.sandboxFallback)
|
||||
_exit(1);
|
||||
/* Mention sandbox-fallback in the error message so the user
|
||||
knows that having it disabled contributed to the
|
||||
unrecoverability of this failure */
|
||||
throw SysError(errno_, "creating sandboxed builder process using clone(), without sandbox-fallback");
|
||||
}
|
||||
default:
|
||||
throw SysError("creating sandboxed builder process using clone()");
|
||||
}
|
||||
}
|
||||
writeFull(builderOut.writeSide.get(),
|
||||
fmt("%d %d\n", usingUserNamespace, child));
|
||||
_exit(0);
|
||||
|
|
@ -2350,10 +2374,8 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
|
|||
if (*scratchPath != finalPath) {
|
||||
// Also rewrite the output path
|
||||
auto source = sinkToSource([&](Sink & nextSink) {
|
||||
StringSink sink;
|
||||
dumpPath(actualPath, sink);
|
||||
RewritingSink rsink2(oldHashPart, std::string(finalPath.hashPart()), nextSink);
|
||||
rsink2(sink.s);
|
||||
dumpPath(actualPath, rsink2);
|
||||
rsink2.flush();
|
||||
});
|
||||
Path tmpPath = actualPath + ".tmp";
|
||||
|
|
@ -2600,8 +2622,7 @@ DrvOutputs LocalDerivationGoal::registerOutputs()
|
|||
Path prev = path + checkSuffix;
|
||||
deletePath(prev);
|
||||
Path dst = path + checkSuffix;
|
||||
if (rename(path.c_str(), dst.c_str()))
|
||||
throw SysError("renaming '%s' to '%s'", path, dst);
|
||||
renameFile(path, dst);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -22,8 +22,7 @@ void builtinUnpackChannel(const BasicDerivation & drv)
|
|||
auto entries = readDirectory(out);
|
||||
if (entries.size() != 1)
|
||||
throw Error("channel tarball '%s' contains more than one file", src);
|
||||
if (rename((out + "/" + entries[0].name).c_str(), (out + "/" + channelName).c_str()) == -1)
|
||||
throw SysError("renaming channel directory");
|
||||
renameFile((out + "/" + entries[0].name), (out + "/" + channelName));
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -308,6 +308,9 @@ struct curlFileTransfer : public FileTransfer
|
|||
|
||||
curl_easy_setopt(req, CURLOPT_HTTPHEADER, requestHeaders);
|
||||
|
||||
if (settings.downloadSpeed.get() > 0)
|
||||
curl_easy_setopt(req, CURLOPT_MAX_RECV_SPEED_LARGE, (curl_off_t) (settings.downloadSpeed.get() * 1024));
|
||||
|
||||
if (request.head)
|
||||
curl_easy_setopt(req, CURLOPT_NOBODY, 1);
|
||||
|
||||
|
|
|
|||
|
|
@ -39,9 +39,7 @@ static void makeSymlink(const Path & link, const Path & target)
|
|||
createSymlink(target, tempLink);
|
||||
|
||||
/* Atomically replace the old one. */
|
||||
if (rename(tempLink.c_str(), link.c_str()) == -1)
|
||||
throw SysError("cannot rename '%1%' to '%2%'",
|
||||
tempLink , link);
|
||||
renameFile(tempLink, link);
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -114,7 +114,13 @@ std::vector<Path> getUserConfigFiles()
|
|||
|
||||
unsigned int Settings::getDefaultCores()
|
||||
{
|
||||
return std::max(1U, std::thread::hardware_concurrency());
|
||||
const unsigned int concurrency = std::max(1U, std::thread::hardware_concurrency());
|
||||
const unsigned int maxCPU = getMaxCPU();
|
||||
|
||||
if (maxCPU > 0)
|
||||
return maxCPU;
|
||||
else
|
||||
return concurrency;
|
||||
}
|
||||
|
||||
StringSet Settings::getDefaultSystemFeatures()
|
||||
|
|
|
|||
|
|
@ -746,6 +746,13 @@ public:
|
|||
/nix/store/xfghy8ixrhz3kyy6p724iv3cxji088dx-bash-4.4-p23`.
|
||||
)"};
|
||||
|
||||
Setting<unsigned int> downloadSpeed {
|
||||
this, 0, "download-speed",
|
||||
R"(
|
||||
Specify the maximum transfer rate in kilobytes per second you want
|
||||
Nix to use for downloads.
|
||||
)"};
|
||||
|
||||
Setting<std::string> netrcFile{
|
||||
this, fmt("%s/%s", nixConfDir, "netrc"), "netrc-file",
|
||||
R"(
|
||||
|
|
|
|||
|
|
@ -57,8 +57,7 @@ protected:
|
|||
AutoDelete del(tmp, false);
|
||||
StreamToSourceAdapter source(istream);
|
||||
writeFile(tmp, source);
|
||||
if (rename(tmp.c_str(), path2.c_str()))
|
||||
throw SysError("renaming '%1%' to '%2%'", tmp, path2);
|
||||
renameFile(tmp, path2);
|
||||
del.cancel();
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1430,8 +1430,7 @@ StorePath LocalStore::addToStoreFromDump(Source & source0, std::string_view name
|
|||
writeFile(realPath, dumpSource);
|
||||
} else {
|
||||
/* Move the temporary path we restored above. */
|
||||
if (rename(tempPath.c_str(), realPath.c_str()))
|
||||
throw Error("renaming '%s' to '%s'", tempPath, realPath);
|
||||
moveFile(tempPath, realPath);
|
||||
}
|
||||
|
||||
/* For computing the nar hash. In recursive SHA-256 mode, this
|
||||
|
|
@ -1942,8 +1941,7 @@ void LocalStore::addBuildLog(const StorePath & drvPath, std::string_view log)
|
|||
|
||||
writeFile(tmpFile, compress("bzip2", log));
|
||||
|
||||
if (rename(tmpFile.c_str(), logPath.c_str()) != 0)
|
||||
throw SysError("renaming '%1%' to '%2%'", tmpFile, logPath);
|
||||
renameFile(tmpFile, logPath);
|
||||
}
|
||||
|
||||
std::optional<std::string> LocalStore::getVersion()
|
||||
|
|
|
|||
|
|
@ -229,7 +229,9 @@ void LocalStore::optimisePath_(Activity * act, OptimiseStats & stats,
|
|||
}
|
||||
|
||||
/* Atomically replace the old file with the new hard link. */
|
||||
if (rename(tempLink.c_str(), path.c_str()) == -1) {
|
||||
try {
|
||||
renameFile(tempLink, path);
|
||||
} catch (SysError & e) {
|
||||
if (unlink(tempLink.c_str()) == -1)
|
||||
printError("unable to unlink '%1%'", tempLink);
|
||||
if (errno == EMLINK) {
|
||||
|
|
@ -240,7 +242,7 @@ void LocalStore::optimisePath_(Activity * act, OptimiseStats & stats,
|
|||
debug("'%s' has reached maximum number of links", linkPath);
|
||||
return;
|
||||
}
|
||||
throw SysError("cannot rename '%1%' to '%2%'", tempLink, path);
|
||||
throw;
|
||||
}
|
||||
|
||||
stats.filesLinked++;
|
||||
|
|
|
|||
|
|
@ -580,7 +580,6 @@ ref<const ValidPathInfo> RemoteStore::addCAToStore(
|
|||
|
||||
try {
|
||||
conn->to.written = 0;
|
||||
conn->to.warn = true;
|
||||
connections->incCapacity();
|
||||
{
|
||||
Finally cleanup([&]() { connections->decCapacity(); });
|
||||
|
|
@ -591,7 +590,6 @@ ref<const ValidPathInfo> RemoteStore::addCAToStore(
|
|||
dumpString(contents, conn->to);
|
||||
}
|
||||
}
|
||||
conn->to.warn = false;
|
||||
conn.processStderr();
|
||||
} catch (SysError & e) {
|
||||
/* Daemon closed while we were sending the path. Probably OOM
|
||||
|
|
|
|||
|
|
@ -204,13 +204,19 @@ public:
|
|||
int errNo;
|
||||
|
||||
template<typename... Args>
|
||||
SysError(const Args & ... args)
|
||||
SysError(int errNo_, const Args & ... args)
|
||||
: Error("")
|
||||
{
|
||||
errNo = errno;
|
||||
errNo = errNo_;
|
||||
auto hf = hintfmt(args...);
|
||||
err.msg = hintfmt("%1%: %2%", normaltxt(hf.str()), strerror(errNo));
|
||||
}
|
||||
|
||||
template<typename... Args>
|
||||
SysError(const Args & ... args)
|
||||
: SysError(errno, args ...)
|
||||
{
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
|
|
|
|||
172
src/libutil/filesystem.cc
Normal file
172
src/libutil/filesystem.cc
Normal file
|
|
@ -0,0 +1,172 @@
|
|||
#include <sys/time.h>
|
||||
#include <filesystem>
|
||||
|
||||
#include "finally.hh"
|
||||
#include "util.hh"
|
||||
#include "types.hh"
|
||||
|
||||
namespace fs = std::filesystem;
|
||||
|
||||
namespace nix {
|
||||
|
||||
static Path tempName(Path tmpRoot, const Path & prefix, bool includePid,
|
||||
int & counter)
|
||||
{
|
||||
tmpRoot = canonPath(tmpRoot.empty() ? getEnv("TMPDIR").value_or("/tmp") : tmpRoot, true);
|
||||
if (includePid)
|
||||
return (format("%1%/%2%-%3%-%4%") % tmpRoot % prefix % getpid() % counter++).str();
|
||||
else
|
||||
return (format("%1%/%2%-%3%") % tmpRoot % prefix % counter++).str();
|
||||
}
|
||||
|
||||
Path createTempDir(const Path & tmpRoot, const Path & prefix,
|
||||
bool includePid, bool useGlobalCounter, mode_t mode)
|
||||
{
|
||||
static int globalCounter = 0;
|
||||
int localCounter = 0;
|
||||
int & counter(useGlobalCounter ? globalCounter : localCounter);
|
||||
|
||||
while (1) {
|
||||
checkInterrupt();
|
||||
Path tmpDir = tempName(tmpRoot, prefix, includePid, counter);
|
||||
if (mkdir(tmpDir.c_str(), mode) == 0) {
|
||||
#if __FreeBSD__
|
||||
/* Explicitly set the group of the directory. This is to
|
||||
work around around problems caused by BSD's group
|
||||
ownership semantics (directories inherit the group of
|
||||
the parent). For instance, the group of /tmp on
|
||||
FreeBSD is "wheel", so all directories created in /tmp
|
||||
will be owned by "wheel"; but if the user is not in
|
||||
"wheel", then "tar" will fail to unpack archives that
|
||||
have the setgid bit set on directories. */
|
||||
if (chown(tmpDir.c_str(), (uid_t) -1, getegid()) != 0)
|
||||
throw SysError("setting group of directory '%1%'", tmpDir);
|
||||
#endif
|
||||
return tmpDir;
|
||||
}
|
||||
if (errno != EEXIST)
|
||||
throw SysError("creating directory '%1%'", tmpDir);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
std::pair<AutoCloseFD, Path> createTempFile(const Path & prefix)
|
||||
{
|
||||
Path tmpl(getEnv("TMPDIR").value_or("/tmp") + "/" + prefix + ".XXXXXX");
|
||||
// Strictly speaking, this is UB, but who cares...
|
||||
// FIXME: use O_TMPFILE.
|
||||
AutoCloseFD fd(mkstemp((char *) tmpl.c_str()));
|
||||
if (!fd)
|
||||
throw SysError("creating temporary file '%s'", tmpl);
|
||||
closeOnExec(fd.get());
|
||||
return {std::move(fd), tmpl};
|
||||
}
|
||||
|
||||
void createSymlink(const Path & target, const Path & link,
|
||||
std::optional<time_t> mtime)
|
||||
{
|
||||
if (symlink(target.c_str(), link.c_str()))
|
||||
throw SysError("creating symlink from '%1%' to '%2%'", link, target);
|
||||
if (mtime) {
|
||||
struct timeval times[2];
|
||||
times[0].tv_sec = *mtime;
|
||||
times[0].tv_usec = 0;
|
||||
times[1].tv_sec = *mtime;
|
||||
times[1].tv_usec = 0;
|
||||
if (lutimes(link.c_str(), times))
|
||||
throw SysError("setting time of symlink '%s'", link);
|
||||
}
|
||||
}
|
||||
|
||||
void replaceSymlink(const Path & target, const Path & link,
|
||||
std::optional<time_t> mtime)
|
||||
{
|
||||
for (unsigned int n = 0; true; n++) {
|
||||
Path tmp = canonPath(fmt("%s/.%d_%s", dirOf(link), n, baseNameOf(link)));
|
||||
|
||||
try {
|
||||
createSymlink(target, tmp, mtime);
|
||||
} catch (SysError & e) {
|
||||
if (e.errNo == EEXIST) continue;
|
||||
throw;
|
||||
}
|
||||
|
||||
renameFile(tmp, link);
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void setWriteTime(const fs::path & p, const struct stat & st)
|
||||
{
|
||||
struct timeval times[2];
|
||||
times[0] = {
|
||||
.tv_sec = st.st_atime,
|
||||
.tv_usec = 0,
|
||||
};
|
||||
times[1] = {
|
||||
.tv_sec = st.st_mtime,
|
||||
.tv_usec = 0,
|
||||
};
|
||||
if (lutimes(p.c_str(), times) != 0)
|
||||
throw SysError("changing modification time of '%s'", p);
|
||||
}
|
||||
|
||||
void copy(const fs::directory_entry & from, const fs::path & to, bool andDelete)
|
||||
{
|
||||
// TODO: Rewrite the `is_*` to use `symlink_status()`
|
||||
auto statOfFrom = lstat(from.path().c_str());
|
||||
auto fromStatus = from.symlink_status();
|
||||
|
||||
// Mark the directory as writable so that we can delete its children
|
||||
if (andDelete && fs::is_directory(fromStatus)) {
|
||||
fs::permissions(from.path(), fs::perms::owner_write, fs::perm_options::add | fs::perm_options::nofollow);
|
||||
}
|
||||
|
||||
|
||||
if (fs::is_symlink(fromStatus) || fs::is_regular_file(fromStatus)) {
|
||||
fs::copy(from.path(), to, fs::copy_options::copy_symlinks | fs::copy_options::overwrite_existing);
|
||||
} else if (fs::is_directory(fromStatus)) {
|
||||
fs::create_directory(to);
|
||||
for (auto & entry : fs::directory_iterator(from.path())) {
|
||||
copy(entry, to / entry.path().filename(), andDelete);
|
||||
}
|
||||
} else {
|
||||
throw Error("file '%s' has an unsupported type", from.path());
|
||||
}
|
||||
|
||||
setWriteTime(to, statOfFrom);
|
||||
if (andDelete) {
|
||||
if (!fs::is_symlink(fromStatus))
|
||||
fs::permissions(from.path(), fs::perms::owner_write, fs::perm_options::add | fs::perm_options::nofollow);
|
||||
fs::remove(from.path());
|
||||
}
|
||||
}
|
||||
|
||||
void renameFile(const Path & oldName, const Path & newName)
|
||||
{
|
||||
fs::rename(oldName, newName);
|
||||
}
|
||||
|
||||
void moveFile(const Path & oldName, const Path & newName)
|
||||
{
|
||||
try {
|
||||
renameFile(oldName, newName);
|
||||
} catch (fs::filesystem_error & e) {
|
||||
auto oldPath = fs::path(oldName);
|
||||
auto newPath = fs::path(newName);
|
||||
// For the move to be as atomic as possible, copy to a temporary
|
||||
// directory
|
||||
fs::path temp = createTempDir(newPath.parent_path(), "rename-tmp");
|
||||
Finally removeTemp = [&]() { fs::remove(temp); };
|
||||
auto tempCopyTarget = temp / "copy-target";
|
||||
if (e.code().value() == EXDEV) {
|
||||
fs::remove(newPath);
|
||||
warn("Can’t rename %s as %s, copying instead", oldName, newName);
|
||||
copy(fs::directory_entry(oldPath), tempCopyTarget, true);
|
||||
renameFile(tempCopyTarget, newPath);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -6,7 +6,8 @@
|
|||
|
||||
namespace nix {
|
||||
|
||||
void toJSON(std::ostream & str, const char * start, const char * end)
|
||||
template<>
|
||||
void toJSON<std::string_view>(std::ostream & str, const std::string_view & s)
|
||||
{
|
||||
constexpr size_t BUF_SIZE = 4096;
|
||||
char buf[BUF_SIZE + 7]; // BUF_SIZE + largest single sequence of puts
|
||||
|
|
@ -21,7 +22,7 @@ void toJSON(std::ostream & str, const char * start, const char * end)
|
|||
};
|
||||
|
||||
put('"');
|
||||
for (auto i = start; i != end; i++) {
|
||||
for (auto i = s.begin(); i != s.end(); i++) {
|
||||
if (bufPos >= BUF_SIZE) flush();
|
||||
if (*i == '\"' || *i == '\\') { put('\\'); put(*i); }
|
||||
else if (*i == '\n') { put('\\'); put('n'); }
|
||||
|
|
@ -44,7 +45,7 @@ void toJSON(std::ostream & str, const char * start, const char * end)
|
|||
|
||||
void toJSON(std::ostream & str, const char * s)
|
||||
{
|
||||
if (!s) str << "null"; else toJSON(str, s, s + strlen(s));
|
||||
if (!s) str << "null"; else toJSON(str, std::string_view(s));
|
||||
}
|
||||
|
||||
template<> void toJSON<int>(std::ostream & str, const int & n) { str << n; }
|
||||
|
|
@ -55,11 +56,7 @@ template<> void toJSON<long long>(std::ostream & str, const long long & n) { str
|
|||
template<> void toJSON<unsigned long long>(std::ostream & str, const unsigned long long & n) { str << n; }
|
||||
template<> void toJSON<float>(std::ostream & str, const float & n) { str << n; }
|
||||
template<> void toJSON<double>(std::ostream & str, const double & n) { str << n; }
|
||||
|
||||
template<> void toJSON<std::string>(std::ostream & str, const std::string & s)
|
||||
{
|
||||
toJSON(str, s.c_str(), s.c_str() + s.size());
|
||||
}
|
||||
template<> void toJSON<std::string>(std::ostream & str, const std::string & s) { toJSON(str, (std::string_view) s); }
|
||||
|
||||
template<> void toJSON<bool>(std::ostream & str, const bool & b)
|
||||
{
|
||||
|
|
@ -154,7 +151,7 @@ JSONObject::~JSONObject()
|
|||
}
|
||||
}
|
||||
|
||||
void JSONObject::attr(const std::string & s)
|
||||
void JSONObject::attr(std::string_view s)
|
||||
{
|
||||
comma();
|
||||
toJSON(state->str, s);
|
||||
|
|
@ -162,19 +159,19 @@ void JSONObject::attr(const std::string & s)
|
|||
if (state->indent) state->str << ' ';
|
||||
}
|
||||
|
||||
JSONList JSONObject::list(const std::string & name)
|
||||
JSONList JSONObject::list(std::string_view name)
|
||||
{
|
||||
attr(name);
|
||||
return JSONList(state);
|
||||
}
|
||||
|
||||
JSONObject JSONObject::object(const std::string & name)
|
||||
JSONObject JSONObject::object(std::string_view name)
|
||||
{
|
||||
attr(name);
|
||||
return JSONObject(state);
|
||||
}
|
||||
|
||||
JSONPlaceholder JSONObject::placeholder(const std::string & name)
|
||||
JSONPlaceholder JSONObject::placeholder(std::string_view name)
|
||||
{
|
||||
attr(name);
|
||||
return JSONPlaceholder(state);
|
||||
|
|
@ -196,7 +193,11 @@ JSONObject JSONPlaceholder::object()
|
|||
|
||||
JSONPlaceholder::~JSONPlaceholder()
|
||||
{
|
||||
assert(!first || std::uncaught_exceptions());
|
||||
if (first) {
|
||||
assert(std::uncaught_exceptions());
|
||||
if (state->stack != 0)
|
||||
write(nullptr);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -6,7 +6,6 @@
|
|||
|
||||
namespace nix {
|
||||
|
||||
void toJSON(std::ostream & str, const char * start, const char * end);
|
||||
void toJSON(std::ostream & str, const char * s);
|
||||
|
||||
template<typename T>
|
||||
|
|
@ -107,7 +106,7 @@ private:
|
|||
open();
|
||||
}
|
||||
|
||||
void attr(const std::string & s);
|
||||
void attr(std::string_view s);
|
||||
|
||||
public:
|
||||
|
||||
|
|
@ -128,18 +127,18 @@ public:
|
|||
~JSONObject();
|
||||
|
||||
template<typename T>
|
||||
JSONObject & attr(const std::string & name, const T & v)
|
||||
JSONObject & attr(std::string_view name, const T & v)
|
||||
{
|
||||
attr(name);
|
||||
toJSON(state->str, v);
|
||||
return *this;
|
||||
}
|
||||
|
||||
JSONList list(const std::string & name);
|
||||
JSONList list(std::string_view name);
|
||||
|
||||
JSONObject object(const std::string & name);
|
||||
JSONObject object(std::string_view name);
|
||||
|
||||
JSONPlaceholder placeholder(const std::string & name);
|
||||
JSONPlaceholder placeholder(std::string_view name);
|
||||
};
|
||||
|
||||
class JSONPlaceholder : JSONWriter
|
||||
|
|
|
|||
|
|
@ -48,24 +48,9 @@ FdSink::~FdSink()
|
|||
}
|
||||
|
||||
|
||||
size_t threshold = 256 * 1024 * 1024;
|
||||
|
||||
static void warnLargeDump()
|
||||
{
|
||||
warn("dumping very large path (> 256 MiB); this may run out of memory");
|
||||
}
|
||||
|
||||
|
||||
void FdSink::write(std::string_view data)
|
||||
{
|
||||
written += data.size();
|
||||
static bool warned = false;
|
||||
if (warn && !warned) {
|
||||
if (written > threshold) {
|
||||
warnLargeDump();
|
||||
warned = true;
|
||||
}
|
||||
}
|
||||
try {
|
||||
writeFull(fd, data);
|
||||
} catch (SysError & e) {
|
||||
|
|
@ -448,11 +433,6 @@ Error readError(Source & source)
|
|||
|
||||
void StringSink::operator () (std::string_view data)
|
||||
{
|
||||
static bool warned = false;
|
||||
if (!warned && s.size() > threshold) {
|
||||
warnLargeDump();
|
||||
warned = true;
|
||||
}
|
||||
s.append(data);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -97,19 +97,17 @@ protected:
|
|||
struct FdSink : BufferedSink
|
||||
{
|
||||
int fd;
|
||||
bool warn = false;
|
||||
size_t written = 0;
|
||||
|
||||
FdSink() : fd(-1) { }
|
||||
FdSink(int fd) : fd(fd) { }
|
||||
FdSink(FdSink&&) = default;
|
||||
|
||||
FdSink& operator=(FdSink && s)
|
||||
FdSink & operator=(FdSink && s)
|
||||
{
|
||||
flush();
|
||||
fd = s.fd;
|
||||
s.fd = -1;
|
||||
warn = s.warn;
|
||||
written = s.written;
|
||||
return *this;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -102,8 +102,8 @@ namespace nix {
|
|||
|
||||
TEST(toJSON, substringEscape) {
|
||||
std::stringstream out;
|
||||
const char *s = "foo\t";
|
||||
toJSON(out, s+3, s + strlen(s));
|
||||
std::string_view s = "foo\t";
|
||||
toJSON(out, s.substr(3));
|
||||
|
||||
ASSERT_EQ(out.str(), "\"\\t\"");
|
||||
}
|
||||
|
|
|
|||
|
|
@ -35,6 +35,9 @@
|
|||
#ifdef __linux__
|
||||
#include <sys/prctl.h>
|
||||
#include <sys/resource.h>
|
||||
|
||||
#include <mntent.h>
|
||||
#include <cmath>
|
||||
#endif
|
||||
|
||||
|
||||
|
|
@ -505,61 +508,6 @@ void deletePath(const Path & path, uint64_t & bytesFreed)
|
|||
}
|
||||
|
||||
|
||||
static Path tempName(Path tmpRoot, const Path & prefix, bool includePid,
|
||||
int & counter)
|
||||
{
|
||||
tmpRoot = canonPath(tmpRoot.empty() ? getEnv("TMPDIR").value_or("/tmp") : tmpRoot, true);
|
||||
if (includePid)
|
||||
return (format("%1%/%2%-%3%-%4%") % tmpRoot % prefix % getpid() % counter++).str();
|
||||
else
|
||||
return (format("%1%/%2%-%3%") % tmpRoot % prefix % counter++).str();
|
||||
}
|
||||
|
||||
|
||||
Path createTempDir(const Path & tmpRoot, const Path & prefix,
|
||||
bool includePid, bool useGlobalCounter, mode_t mode)
|
||||
{
|
||||
static int globalCounter = 0;
|
||||
int localCounter = 0;
|
||||
int & counter(useGlobalCounter ? globalCounter : localCounter);
|
||||
|
||||
while (1) {
|
||||
checkInterrupt();
|
||||
Path tmpDir = tempName(tmpRoot, prefix, includePid, counter);
|
||||
if (mkdir(tmpDir.c_str(), mode) == 0) {
|
||||
#if __FreeBSD__
|
||||
/* Explicitly set the group of the directory. This is to
|
||||
work around around problems caused by BSD's group
|
||||
ownership semantics (directories inherit the group of
|
||||
the parent). For instance, the group of /tmp on
|
||||
FreeBSD is "wheel", so all directories created in /tmp
|
||||
will be owned by "wheel"; but if the user is not in
|
||||
"wheel", then "tar" will fail to unpack archives that
|
||||
have the setgid bit set on directories. */
|
||||
if (chown(tmpDir.c_str(), (uid_t) -1, getegid()) != 0)
|
||||
throw SysError("setting group of directory '%1%'", tmpDir);
|
||||
#endif
|
||||
return tmpDir;
|
||||
}
|
||||
if (errno != EEXIST)
|
||||
throw SysError("creating directory '%1%'", tmpDir);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
std::pair<AutoCloseFD, Path> createTempFile(const Path & prefix)
|
||||
{
|
||||
Path tmpl(getEnv("TMPDIR").value_or("/tmp") + "/" + prefix + ".XXXXXX");
|
||||
// Strictly speaking, this is UB, but who cares...
|
||||
// FIXME: use O_TMPFILE.
|
||||
AutoCloseFD fd(mkstemp((char *) tmpl.c_str()));
|
||||
if (!fd)
|
||||
throw SysError("creating temporary file '%s'", tmpl);
|
||||
closeOnExec(fd.get());
|
||||
return {std::move(fd), tmpl};
|
||||
}
|
||||
|
||||
|
||||
std::string getUserName()
|
||||
{
|
||||
auto pw = getpwuid(geteuid());
|
||||
|
|
@ -574,6 +522,7 @@ Path getHome()
|
|||
{
|
||||
static Path homeDir = []()
|
||||
{
|
||||
std::optional<std::string> unownedUserHomeDir = {};
|
||||
auto homeDir = getEnv("HOME");
|
||||
if (homeDir) {
|
||||
// Only use $HOME if doesn't exist or is owned by the current user.
|
||||
|
|
@ -585,8 +534,7 @@ Path getHome()
|
|||
homeDir.reset();
|
||||
}
|
||||
} else if (st.st_uid != geteuid()) {
|
||||
warn("$HOME ('%s') is not owned by you, falling back to the one defined in the 'passwd' file", *homeDir);
|
||||
homeDir.reset();
|
||||
unownedUserHomeDir.swap(homeDir);
|
||||
}
|
||||
}
|
||||
if (!homeDir) {
|
||||
|
|
@ -597,6 +545,9 @@ Path getHome()
|
|||
|| !pw || !pw->pw_dir || !pw->pw_dir[0])
|
||||
throw Error("cannot determine user's home directory");
|
||||
homeDir = pw->pw_dir;
|
||||
if (unownedUserHomeDir.has_value() && unownedUserHomeDir != homeDir) {
|
||||
warn("$HOME ('%s') is not owned by you, falling back to the one defined in the 'passwd' file ('%s')", *unownedUserHomeDir, *homeDir);
|
||||
}
|
||||
}
|
||||
return *homeDir;
|
||||
}();
|
||||
|
|
@ -678,44 +629,6 @@ Paths createDirs(const Path & path)
|
|||
}
|
||||
|
||||
|
||||
void createSymlink(const Path & target, const Path & link,
|
||||
std::optional<time_t> mtime)
|
||||
{
|
||||
if (symlink(target.c_str(), link.c_str()))
|
||||
throw SysError("creating symlink from '%1%' to '%2%'", link, target);
|
||||
if (mtime) {
|
||||
struct timeval times[2];
|
||||
times[0].tv_sec = *mtime;
|
||||
times[0].tv_usec = 0;
|
||||
times[1].tv_sec = *mtime;
|
||||
times[1].tv_usec = 0;
|
||||
if (lutimes(link.c_str(), times))
|
||||
throw SysError("setting time of symlink '%s'", link);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void replaceSymlink(const Path & target, const Path & link,
|
||||
std::optional<time_t> mtime)
|
||||
{
|
||||
for (unsigned int n = 0; true; n++) {
|
||||
Path tmp = canonPath(fmt("%s/.%d_%s", dirOf(link), n, baseNameOf(link)));
|
||||
|
||||
try {
|
||||
createSymlink(target, tmp, mtime);
|
||||
} catch (SysError & e) {
|
||||
if (e.errNo == EEXIST) continue;
|
||||
throw;
|
||||
}
|
||||
|
||||
if (rename(tmp.c_str(), link.c_str()) != 0)
|
||||
throw SysError("renaming '%1%' to '%2%'", tmp, link);
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void readFull(int fd, char * buf, size_t count)
|
||||
{
|
||||
while (count) {
|
||||
|
|
@ -788,7 +701,55 @@ void drainFD(int fd, Sink & sink, bool block)
|
|||
}
|
||||
}
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
unsigned int getMaxCPU()
|
||||
{
|
||||
#if __linux__
|
||||
try {
|
||||
FILE *fp = fopen("/proc/mounts", "r");
|
||||
if (!fp)
|
||||
return 0;
|
||||
|
||||
Strings cgPathParts;
|
||||
|
||||
struct mntent *ent;
|
||||
while ((ent = getmntent(fp))) {
|
||||
std::string mountType, mountPath;
|
||||
|
||||
mountType = ent->mnt_type;
|
||||
mountPath = ent->mnt_dir;
|
||||
|
||||
if (mountType == "cgroup2") {
|
||||
cgPathParts.push_back(mountPath);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
fclose(fp);
|
||||
|
||||
if (cgPathParts.size() > 0 && pathExists("/proc/self/cgroup")) {
|
||||
std::string currentCgroup = readFile("/proc/self/cgroup");
|
||||
Strings cgValues = tokenizeString<Strings>(currentCgroup, ":");
|
||||
cgPathParts.push_back(trim(cgValues.back(), "\n"));
|
||||
cgPathParts.push_back("cpu.max");
|
||||
std::string fullCgPath = canonPath(concatStringsSep("/", cgPathParts));
|
||||
|
||||
if (pathExists(fullCgPath)) {
|
||||
std::string cpuMax = readFile(fullCgPath);
|
||||
std::vector<std::string> cpuMaxParts = tokenizeString<std::vector<std::string>>(cpuMax, " ");
|
||||
std::string quota = cpuMaxParts[0];
|
||||
std::string period = trim(cpuMaxParts[1], "\n");
|
||||
|
||||
if (quota != "max")
|
||||
return std::ceil(std::stoi(quota) / std::stof(period));
|
||||
}
|
||||
}
|
||||
} catch (Error &) { ignoreException(); }
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
|
|
|
|||
|
|
@ -168,6 +168,17 @@ void createSymlink(const Path & target, const Path & link,
|
|||
void replaceSymlink(const Path & target, const Path & link,
|
||||
std::optional<time_t> mtime = {});
|
||||
|
||||
void renameFile(const Path & src, const Path & dst);
|
||||
|
||||
/**
|
||||
* Similar to 'renameFile', but fallback to a copy+remove if `src` and `dst`
|
||||
* are on a different filesystem.
|
||||
*
|
||||
* Beware that this might not be atomic because of the copy that happens behind
|
||||
* the scenes
|
||||
*/
|
||||
void moveFile(const Path & src, const Path & dst);
|
||||
|
||||
|
||||
/* Wrappers arount read()/write() that read/write exactly the
|
||||
requested number of bytes. */
|
||||
|
|
@ -182,6 +193,9 @@ std::string drainFD(int fd, bool block = true, const size_t reserveSize=0);
|
|||
|
||||
void drainFD(int fd, Sink & sink, bool block = true);
|
||||
|
||||
/* If cgroups are active, attempt to calculate the number of CPUs available.
|
||||
If cgroups are unavailable or if cpu.max is set to "max", return 0. */
|
||||
unsigned int getMaxCPU();
|
||||
|
||||
/* Automatic cleanup of resources. */
|
||||
|
||||
|
|
|
|||
|
|
@ -940,12 +940,12 @@ static void queryJSON(Globals & globals, std::vector<DrvInfo> & elems, bool prin
|
|||
JSONObject metaObj = pkgObj.object("meta");
|
||||
StringSet metaNames = i.queryMetaNames();
|
||||
for (auto & j : metaNames) {
|
||||
auto placeholder = metaObj.placeholder(j);
|
||||
Value * v = i.queryMeta(j);
|
||||
if (!v) {
|
||||
printError("derivation '%s' has invalid meta attribute '%s'", i.queryName(), j);
|
||||
placeholder.write(nullptr);
|
||||
metaObj.attr(j, nullptr);
|
||||
} else {
|
||||
auto placeholder = metaObj.placeholder(j);
|
||||
PathSet context;
|
||||
printValueAsJSON(*globals.state, true, *v, noPos, placeholder, context);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -44,7 +44,7 @@ flake output attributes:
|
|||
|
||||
* `bundlers.<system>.default`
|
||||
|
||||
If an attribute *name* is given, `nix run` tries the following flake
|
||||
If an attribute *name* is given, `nix bundle` tries the following flake
|
||||
output attributes:
|
||||
|
||||
* `bundlers.<system>.<name>`
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@ R""(
|
|||
lock file:
|
||||
|
||||
```console
|
||||
# nix flake update
|
||||
# nix flake update --commit-lock-file
|
||||
* Updated 'nix': 'github:NixOS/nix/9fab14adbc3810d5cc1f88672fde1eee4358405c' -> 'github:NixOS/nix/8927cba62f5afb33b01016d5c4f7f8b7d0adde3c'
|
||||
* Updated 'nixpkgs': 'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' -> 'github:NixOS/nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293'
|
||||
…
|
||||
|
|
|
|||
|
|
@ -212,7 +212,8 @@ struct CmdFlakeMetadata : FlakeCommand, MixJSON
|
|||
ANSI_BOLD "Last modified:" ANSI_NORMAL " %s",
|
||||
std::put_time(std::localtime(&*lastModified), "%F %T"));
|
||||
|
||||
logger->cout(ANSI_BOLD "Inputs:" ANSI_NORMAL);
|
||||
if (!lockedFlake.lockFile.root->inputs.empty())
|
||||
logger->cout(ANSI_BOLD "Inputs:" ANSI_NORMAL);
|
||||
|
||||
std::unordered_set<std::shared_ptr<Node>> visited;
|
||||
|
||||
|
|
|
|||
|
|
@ -11,7 +11,7 @@ them to be rolled back easily.
|
|||
|
||||
The default profile used by `nix profile` is `$HOME/.nix-profile`,
|
||||
which, if it does not exist, is created as a symlink to
|
||||
`/nix/var/nix/profiles/per-user/default` if Nix is invoked by the
|
||||
`/nix/var/nix/profiles/default` if Nix is invoked by the
|
||||
`root` user, or `/nix/var/nix/profiles/per-user/`*username* otherwise.
|
||||
|
||||
You can specify another profile location using `--profile` *path*.
|
||||
|
|
|
|||
|
|
@ -40,6 +40,14 @@ nix-build check.nix -A deterministic --argstr checkBuildId $checkBuildId \
|
|||
if grep -q 'may not be deterministic' $TEST_ROOT/log; then false; fi
|
||||
checkBuildTempDirRemoved $TEST_ROOT/log
|
||||
|
||||
nix build -f check.nix deterministic --rebuild --repeat 1 \
|
||||
--argstr checkBuildId $checkBuildId --keep-failed --no-link \
|
||||
2> $TEST_ROOT/log
|
||||
if grep -q 'checking is not possible' $TEST_ROOT/log; then false; fi
|
||||
# Repeat is set to 1, ie. nix should build deterministic twice.
|
||||
if [ "$(grep "checking outputs" $TEST_ROOT/log | wc -l)" -ne 2 ]; then false; fi
|
||||
checkBuildTempDirRemoved $TEST_ROOT/log
|
||||
|
||||
nix-build check.nix -A nondeterministic --argstr checkBuildId $checkBuildId \
|
||||
--no-out-link 2> $TEST_ROOT/log
|
||||
checkBuildTempDirRemoved $TEST_ROOT/log
|
||||
|
|
@ -50,6 +58,12 @@ grep 'may not be deterministic' $TEST_ROOT/log
|
|||
[ "$status" = "104" ]
|
||||
checkBuildTempDirRemoved $TEST_ROOT/log
|
||||
|
||||
nix build -f check.nix nondeterministic --rebuild --repeat 1 \
|
||||
--argstr checkBuildId $checkBuildId --keep-failed --no-link \
|
||||
2> $TEST_ROOT/log || status=$?
|
||||
grep 'may not be deterministic' $TEST_ROOT/log
|
||||
checkBuildTempDirRemoved $TEST_ROOT/log
|
||||
|
||||
nix-build check.nix -A nondeterministic --argstr checkBuildId $checkBuildId \
|
||||
--no-out-link --check --keep-failed 2> $TEST_ROOT/log || status=$?
|
||||
grep 'may not be deterministic' $TEST_ROOT/log
|
||||
|
|
|
|||
|
|
@ -193,7 +193,7 @@ fi
|
|||
onError() {
|
||||
set +x
|
||||
echo "$0: test failed at:" >&2
|
||||
for ((i = 1; i < 16; i++)); do
|
||||
for ((i = 1; i < ${#BASH_SOURCE[@]}; i++)); do
|
||||
if [[ -z ${BASH_SOURCE[i]} ]]; then break; fi
|
||||
echo " ${FUNCNAME[i]} in ${BASH_SOURCE[i]}:${BASH_LINENO[i-1]}" >&2
|
||||
done
|
||||
|
|
|
|||
Loading…
Reference in a new issue