Commit graph

69 commits

Author SHA1 Message Date
Albert Safin f2a03acf3f nix-shell: clean up the tmpDir and escape variables
The problem fixed: each nix-shell invocation creates a new temporary
directory (`/tmp/nix-shell-*`) and never cleans up.

And while I'm here, shellescape all variables inlined into the rcfile.
See what might happen without escaping:

    $ export TZ="';echo pwned'"
    $ nix-shell -p hello --run hello
    pwned
    Hello, world!
2020-02-19 14:28:49 +00:00
Albert Safin a70706b025 nix-shell: don't check for "nix-shell" in shebang script name 2019-12-14 15:37:20 +00:00
Eelco Dolstra bbe97dff8b Make the Store API more type-safe
Most functions now take a StorePath argument rather than a Path (which
is just an alias for std::string). The StorePath constructor ensures
that the path is syntactically correct (i.e. it looks like
<store-dir>/<base32-hash>-<name>). Similarly, functions like
buildPaths() now take a StorePathWithOutputs, rather than abusing Path
by adding a '!<outputs>' suffix.

Note that the StorePath type is implemented in Rust. This involves
some hackery to allow Rust values to be used directly in C++, via a
helper type whose destructor calls the Rust type's drop()
function. The main issue is the dynamic nature of C++ move semantics:
after we have moved a Rust value, we should not call the drop function
on the original value. So when we move a value, we set the original
value to bitwise zero, and the destructor only calls drop() if the
value is not bitwise zero. This should be sufficient for most types.

Also lots of minor cleanups to the C++ API to make it more modern
(e.g. using std::optional and std::string_view in some places).
2019-12-10 22:06:05 +01:00
Eelco Dolstra ba87b08f85
getEnv(): Return std::optional
This allows distinguishing between an empty value and no value.
2019-11-22 16:18:13 +01:00
Eelco Dolstra 3913afdd69
Simplification 2019-10-27 18:00:09 +01:00
Robert Hensing 9d612c393a Add inNixShell = true to nix-shell auto-call
This is an alternative to the IN_NIX_SHELL environment variable,
allowing the expression to adapt itself to nix-shell without
triggering those adaptations when used as a dependency of another
shell.

Closes #3147
2019-10-27 13:16:02 +01:00
Eelco Dolstra 64d8872900
nix-build: Fix compilation 2019-10-09 14:46:44 +02:00
Matthew Bauer 65f6d5db6f Don’t source bashrc in pure mode
Pure mode should not try to source the user’s bashrc file. These may
have many impurities that the user does not expect to get into their
shell.

Fixes #3090
2019-10-08 22:41:59 -04:00
Eelco Dolstra 15e70c662e
Fix indentation 2019-10-02 16:26:15 +02:00
Eelco Dolstra bd79c1f6f6 Don't catch exceptions by value
(cherry picked from commit 893be6f5e3)
2019-09-22 21:56:56 +02:00
Eelco Dolstra 7c6391ddc7
nix-shell: Don't absolutize '-p' expressions
This prevents spurious syscalls like

  25011 lstat("/home/eelco/with import <nixpkgs> { }; (pkgs.runCommandCC or pkgs.runCommand) \"shell\" { buildInputs = [ (hello) ]; } \"\"", 0x7ffe9c67f580) = -1 ENOENT (No such file or directory)
2019-05-08 14:29:36 +02:00
Eelco Dolstra 01d07b1e92
Revert "Restore parent mount namespace before executing a child process"
This reverts commit a0ef21262f. This
doesn't work in 'nix run' and nix-shell because setns() fails in
multithreaded programs, and Boehm GC mark threads are uncancellable.

Fixes #2646.
2019-02-05 10:49:19 +01:00
Eelco Dolstra a0ef21262f
Restore parent mount namespace before executing a child process
This ensures that they can't write to /nix/store. Fixes #2535.
2018-11-13 16:15:30 +01:00
Eelco Dolstra f6a3dfe4e0
Merge all nix-* binaries into nix
These are all symlinks to 'nix' now, reducing the installed size by
about ~1.7 MiB.
2018-10-26 12:54:00 +02:00
Graham Christensen f11acbaf17
nix-shell: add bashInteractive to the start of the PATH, set SHELL
Tools which re-exec `$SHELL` or `$0` or `basename $SHELL` or even just
`bash` will otherwise  get the non-interactive bash, providing a
broken shell for the same reasons described in
https://github.com/NixOS/nixpkgs/issues/27493.

Extends c94f3d5575
2018-09-27 15:12:56 -04:00
Graham Christensen 87702532d2
nix-build: Print stats even in failing builds 2018-08-31 21:03:32 -04:00
Graham Christensen b7bb627f67
nix-build: print stats on sucessful builds 2018-08-31 20:57:07 -04:00
Tuomas Tynkkynen 2894197de7 Drop all references to NIX_INDENT_MAKE
Dead code since 6669a3b477
2018-08-20 02:01:59 +03:00
Eelco Dolstra 122e1a61f8
Merge pull request #2323 from samueldr/feature/selective-impurity
Allows selectively adding environment variables to pure shells.
2018-08-03 16:58:18 +02:00
Samuel Dionne-Riel 438e02529d Allows selectively adding environment variables to pure shells.
Includes documentation and test.
2018-08-02 08:21:30 -04:00
Samuel Dionne-Riel fb6907e3d6 Removes unused variable from nix-build/nix-shell
This particular `shell` variable wasn't used, since a new one was
declared in the only side of the `if` branch that used a `shell`
variable.

It could realistically confuse developers thinking it could use `$SHELL`
under some situations.
2018-08-01 18:30:03 -04:00
Eelco Dolstra 0629601da1
Move EvalState from the stack to the heap
EvalState contains a few counters (e.g. nrValues) that increase
quickly enough that they end up being interpreted as pointers by the
garbage collector. Moving it to the heap makes them invisible to the
garbage collector.

This reduces the max RSS doing 100 evaluations of
nixos.tests.firefox.x86_64-linux.drvPath from 455 MiB to 292 MiB.

Note: ideally, allocations would be much further up in the 64-bit
address space to reduce the odds of an integer being misinterpreted as
a pointer. Maybe we can use some linker magic to move the .bss segment
to a higher address.
2018-06-12 17:49:55 +02:00
Eelco Dolstra a1adcdf087
nix-shell: Only download requested outputs
Fixes #2116.
2018-05-07 14:58:25 +02:00
Samuel Dionne-Riel 399f43c3d5 nix-shell: Fixes use with ruby shebangs.
The ported code in 80ebc553ec was incorrectly ported.

```
-            $envCommand = "exec $execArgs $interpreter -e 'load(\"$script\")' -- ${\(join ' ', (map shellEscape, @savedArgs))}";
...
+                    envCommand = (format("exec %1% %2% -e 'load(\"%3%\") -- %4%") % execArgs % interpreter % script % joined.str()).str();
```

The single-quote finishing the small ruby snippet was lost in
translation.
2018-04-07 22:38:45 -04:00
Linus Heckemann 12913ccf45 nix-shell: allow symlinks to .drvs
This makes persistent shell environments easier to use.
2018-03-16 22:15:24 +00:00
Shea Levy 88cd2d41ac
Add plugins to make Nix more extensible.
All plugins in plugin-files will be dlopened, allowing them to
statically construct instances of the various Register* types Nix
supports.
2018-02-08 12:44:37 -05:00
Eelco Dolstra 84722d67d2
Remove nix-build --hash
Instead, if a fixed-output derivation produces has an incorrect output
hash, we now unconditionally move the outputs to the path
corresponding with the actual hash and register it as valid. Thus,
after correcting the hash in the Nix expression (e.g. in a fetchurl
call), the fixed-output derivation doesn't have to be built again.

It would still be good to have a command for reporting the actual hash
of a fixed-output derivation (instead of throwing an error), but
"nix-build --hash" didn't do that.
2018-02-03 10:08:05 +01:00
Eelco Dolstra 19477e8815
nix-build: Ignore --indirect
Note that nix-build always creates indirect roots.

Fixes #1830.
2018-02-01 17:09:56 +01:00
Eelco Dolstra d4dcffd643
Add pure evaluation mode
In this mode, the following restrictions apply:

* The builtins currentTime, currentSystem and storePath throw an
  error.

* $NIX_PATH and -I are ignored.

* fetchGit and fetchMercurial require a revision hash.

* fetchurl and fetchTarball require a sha256 attribute.

* No file system access is allowed outside of the paths returned by
  fetch{Git,Mercurial,url,Tarball}. Thus 'nix build -f ./foo.nix' is
  not allowed.

Thus, the evaluation result is completely reproducible from the
command line arguments. E.g.

  nix build --pure-eval '(
    let
      nix = fetchGit { url = https://github.com/NixOS/nixpkgs.git; rev = "9c927de4b179a6dd210dd88d34bda8af4b575680"; };
      nixpkgs = fetchGit { url = https://github.com/NixOS/nixpkgs.git; ref = "release-17.09"; rev = "66b4de79e3841530e6d9c6baf98702aa1f7124e4"; };
    in (import (nix + "/release.nix") { inherit nix nixpkgs; }).build.x86_64-linux
  )'

The goal is to enable completely reproducible and traceable
evaluation. For example, a NixOS configuration could be fully
described by a single Git commit hash. 'nixos-rebuild' would do
something like

  nix build --pure-eval '(
    (import (fetchGit { url = file:///my-nixos-config; rev = "..."; })).system
  ')

where the Git repository /my-nixos-config would use further fetchGit
calls or Git externals to fetch Nixpkgs and whatever other
dependencies it has. Either way, the commit hash would uniquely
identify the NixOS configuration and allow it to reproduced.
2018-01-16 19:23:18 +01:00
Eelco Dolstra 90948a4e3a
nix-shell/nix-build: Support .drv files again
Fixes #1663.

Also handle '!<output-name>' (#1694).
2017-11-24 18:08:35 +01:00
Eelco Dolstra 12991152be
nix-build: Fix --hash 2017-10-30 13:31:05 +01:00
Eelco Dolstra 2d5b1b24bf
Pass lists/attrsets to bash as (associative) arrays 2017-10-25 13:01:50 +02:00
Eelco Dolstra 0d59f1ca49
nix: Respect -I, --arg, --argstr
Also, random cleanup to argument handling.
2017-10-24 12:58:34 +02:00
Shea Levy c7af84ce84
nix-shell: Fix file name resolution in shebangs 2017-10-19 15:02:40 -04:00
Eelco Dolstra 84f112b1c8
nix-shell: Ignore readFile() errors
Fixes #1563.
2017-09-18 13:28:00 +02:00
Jörg Thalheim 2fd8f8bb99 Replace Unicode quotes in user-facing strings by ASCII
Relevant RFC: NixOS/rfcs#4

$ ag -l | xargs sed -i -e "/\"/s/’/'/g;/\"/s/‘/'/g"
2017-07-30 12:32:45 +01:00
Eelco Dolstra c7654bc491
nix-build: Fix regression causing all outputs to be built 2017-07-28 15:17:52 +02:00
Eelco Dolstra 4c9ff89c26
nix-build/nix-shell: Eliminate call to nix-instantiate / nix-store
Note that this removes the need for a derivation symlink, so the
--drv-path and --add-drv-link flags now do nothing.
2017-07-26 17:29:09 +02:00
Eelco Dolstra c94f3d5575
nix-shell: Use bashInteractive from <nixpkgs>
This adds about 0.1s to nix-shell runtime in the case where
bashInteractive already exists.

See discussion at https://github.com/NixOS/nixpkgs/issues/27493.
2017-07-20 13:50:25 +02:00
Eelco Dolstra 0a5a867758
nix-shell: Respect --dry-run
Fixes #824.
2017-07-03 11:54:30 +02:00
Eelco Dolstra a7e55151a8
Fix #1314
Also, make nix-shell respect --option. (Previously it only passed it
along to nix-instantiate and nix-build.)
2017-05-24 11:33:42 +02:00
Eelco Dolstra fbe9fe0e75
Merge branch 'topic/cores-master' of https://github.com/neilmayhew/nix 2017-05-24 11:28:36 +02:00
Eelco Dolstra 9711524188
Fix #1380
It lacked a backslash. Use a raw string and single quotes around PS1
to simplify this.
2017-05-24 11:23:28 +02:00
Linus Heckemann d48edcc3a5 nix-shell: use appropriate prompt terminator
If running nix-shell as root, the terminator should be # and not $.
2017-05-10 12:03:45 +01:00
Eelco Dolstra 08355643ab
nix-shell: Implement passAsFile 2017-05-03 15:01:15 +02:00
Eelco Dolstra 9b63bb88c8
nix-shell -p: Use runCommandCC
This restores pre-17.03 behaviour by making gcc available.
2017-04-24 12:04:01 +02:00
Neil Mayhew f12a048a05 Propagate NIX_BUILD_CORES to nix-shell environments 2017-04-09 08:21:52 -06:00
Stefan Junker f628ca2a1f nix-shell/pure: keep environment variable SHLVL 2017-03-12 01:04:21 +01:00
Eelco Dolstra d3e1aad421
nix-shell: Better error message when the shell can't be started 2017-02-24 17:25:00 +01:00
Eelco Dolstra 668fef2e4f
nix-shell: Overwrite environment variables
Need to remember that std::map::insert() and emplace() don't overwrite
existing entries...

This fixes a regression relative to 1.11 that in particular triggers
in nested nix-shells.

Before:

  $ nativeBuildInputs=/foo nix-shell -p hello --run 'hello'
  build input /foo does not exist

After:

  $ nativeBuildInputs=/foo nix-shell -p hello --run 'hello'
  Hello, world!
2017-02-24 13:31:46 +01:00