forked from lix-project/lix
Add a command "nix-build --run-env" to reproduce the environment of a derivation
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
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@ -16,6 +16,7 @@ our @EXPORT = qw(
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topoSortPaths computeFSClosure followLinksToStorePath exportPaths
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hashPath hashFile hashString
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addToStore makeFixedOutputPath
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derivationFromPath
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);
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our $VERSION = '0.15';
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@ -216,3 +216,45 @@ SV * makeFixedOutputPath(int recursive, char * algo, char * hash, char * name)
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} catch (Error & e) {
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croak(e.what());
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}
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SV * derivationFromPath(char * drvPath)
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PREINIT:
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HV *hash;
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CODE:
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try {
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doInit();
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Derivation drv = derivationFromPath(*store, drvPath);
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hash = newHV();
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/* TODO: handle drv.outputs */
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AV * inputDrvs = newAV();
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for (DerivationInputs::iterator i = drv.inputDrvs.begin(); i != drv.inputDrvs.end(); ++i)
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av_push(inputDrvs, newSVpv(i->first.c_str(), 0)); // !!! ignores i->second
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hv_stores(hash, "inputDrvs", newRV((SV *) inputDrvs));
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AV * inputSrcs = newAV();
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for (PathSet::iterator i = drv.inputSrcs.begin(); i != drv.inputSrcs.end(); ++i)
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av_push(inputSrcs, newSVpv(i->c_str(), 0));
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hv_stores(hash, "inputSrcs", newRV((SV *) inputSrcs));
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hv_stores(hash, "platform", newSVpv(drv.platform.c_str(), 0));
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hv_stores(hash, "builder", newSVpv(drv.builder.c_str(), 0));
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AV * args = newAV();
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for (Strings::iterator i = drv.args.begin(); i != drv.args.end(); ++i)
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av_push(args, newSVpv(i->c_str(), 0));
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hv_stores(hash, "args", newRV((SV *) args));
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HV * env = newHV();
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for (StringPairs::iterator i = drv.env.begin(); i != drv.env.end(); ++i)
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hv_store(env, i->first.c_str(), i->first.size(), newSVpv(i->second.c_str(), 0), 0);
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hv_stores(hash, "env", newRV((SV *) env));
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RETVAL = newRV_noinc((SV *)hash);
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} catch (Error & e) {
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croak(e.what());
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}
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OUTPUT:
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RETVAL
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@ -2,11 +2,13 @@
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use strict;
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use Nix::Config;
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use Nix::Store;
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use File::Temp qw(tempdir);
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my $dryRun = 0;
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my $verbose = 0;
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my $runEnv = 0;
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my @instArgs = ();
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my @buildArgs = ();
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@ -119,6 +121,10 @@ EOF
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push @instArgs, $arg;
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}
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elsif ($arg eq "--run-env") {
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$runEnv = 1;
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}
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elsif (substr($arg, 0, 1) eq "-") {
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push @buildArgs, $arg;
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}
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@ -143,6 +149,29 @@ foreach my $expr (@exprs) {
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exit 1;
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}
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if ($runEnv) {
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die "$0: ‘--run-env’ requires a single derivation\n" if scalar @drvPaths != 1;
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my $drvPath = readlink $drvPaths[0] or die "cannot read symlink `$drvPaths[0]'";
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my $drv = derivationFromPath($drvPath);
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# Build or fetch all dependencies of the derivation.
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system("$Nix::Config::binDir/nix-store -r @buildArgs @{$drv->{inputDrvs}} @{$drv->{inputSrcs}} > /dev/null") == 0
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or die "$0: failed to build all dependencies\n";
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# Set the environment.
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$ENV{'NIX_BUILD_TOP'} = $ENV{'TMPDIR'} || "/tmp";
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foreach (keys %{$drv->{env}}) {
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$ENV{$_} = $drv->{env}->{$_};
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}
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# Run a shell using the derivation's environment. For
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# convenience, source $stdenv/setup to setup additional
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# environment variables. Also don't lose the current $PATH
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# directories.
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exec($ENV{SHELL}, "-c", "p=\$PATH; source \$stdenv/setup; PATH=\$PATH:\$p; exec $ENV{SHELL}");
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die;
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}
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foreach my $drvPath (@drvPaths) {
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my $target = readlink $drvPath or die "cannot read symlink `$drvPath'";
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print STDERR "derivation is $target\n" if $verbose;
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