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Add a command "nix-build --run-env" to reproduce the environment of a derivation

Browse source 
This command builds or fetches all dependencies of the given
derivation, then starts a shell with the environment variables from
the derivation.  This shell also sources $stdenv/setup to initialise
the environment further.

The current directory is not changed.  Thus this is a convenient way
to reproduce a build environment in an existing working tree.

Existing environment variables are left untouched (unless the
derivation overrides them).  As a special hack, the original value of
$PATH is appended to the $PATH produced by $stdenv/setup.

Example session:

$ nix-build --run-env '<nixpkgs>' -A xterm
(the dependencies of xterm are built/fetched...)
$ tar xf $src
$ ./configure
$ make
$ emacs
(... hack source ...)
$ make
$ ./xterm
This commit is contained in:
Eelco Dolstra 2012-03-19 04:14:21 +01:00
parent ea402a255f
commit 7f38087f35
3 changed files with 72 additions and 0 deletions
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29
scripts/nix-build.in
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@ -2,11 +2,13 @@
use strict;
use Nix::Config;
use Nix::Store;
use File::Temp qw(tempdir);
my $dryRun = 0;
my $verbose = 0;
my $runEnv = 0;
my @instArgs = ();
my @buildArgs = ();
@ -119,6 +121,10 @@ EOF
push @instArgs, $arg;
}
elsif ($arg eq "--run-env") {
$runEnv = 1;
}
elsif (substr($arg, 0, 1) eq "-") {
push @buildArgs, $arg;
}
@ -143,6 +149,29 @@ foreach my $expr (@exprs) {
exit 1;
}
if ($runEnv) {
die "$0: ‘--run-env’ requires a single derivation\n" if scalar @drvPaths != 1;
my $drvPath = readlink $drvPaths[0] or die "cannot read symlink `$drvPaths[0]'";
my $drv = derivationFromPath($drvPath);
# Build or fetch all dependencies of the derivation.
system("$Nix::Config::binDir/nix-store -r @buildArgs @{$drv->{inputDrvs}} @{$drv->{inputSrcs}} > /dev/null") == 0
or die "$0: failed to build all dependencies\n";
# Set the environment.
$ENV{'NIX_BUILD_TOP'} = $ENV{'TMPDIR'} || "/tmp";
foreach (keys %{$drv->{env}}) {
$ENV{$_} = $drv->{env}->{$_};
}
# Run a shell using the derivation's environment. For
# convenience, source $stdenv/setup to setup additional
# environment variables. Also don't lose the current $PATH
# directories.
exec($ENV{SHELL}, "-c", "p=\$PATH; source \$stdenv/setup; PATH=\$PATH:\$p; exec $ENV{SHELL}");
die;
}
foreach my $drvPath (@drvPaths) {
my $target = readlink $drvPath or die "cannot read symlink `$drvPath'";
print STDERR "derivation is $target\n" if $verbose;