afe23b5f38
* nix-unpack-closure: extract the top-level paths from the closure and print them on stdout. This allows them to be installed, e.g., "nix-env -i $(nix-unpack-closure)". (NIX-64)
72 lines
2.1 KiB
Text
72 lines
2.1 KiB
Text
#! @perl@ -w
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# This tool computes the closure of a path (using "nix-store --query
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# --requisites") and puts the contents of each path in the closure in
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# a big NAR archive that can be installed on another Nix installation
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# using "nix-unpack-closure".
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# TODO: make this program "streamy", i.e., don't use a temporary
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# directory.
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use strict;
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use File::Temp qw(tempdir);
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my $binDir = $ENV{"NIX_BIN_DIR"};
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$binDir = "@bindir@" unless defined $binDir;
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my $tmpDir = tempdir("nix-pack-closure.XXXXXX", CLEANUP => 1, TMPDIR => 1)
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or die "cannot create a temporary directory";
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mkdir "$tmpDir/contents", 0777 or die;
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mkdir "$tmpDir/references", 0777 or die;
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mkdir "$tmpDir/derivers", 0777 or die;
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open TOPLEVEL, ">$tmpDir/top-level" or die;
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my %storePaths;
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while (@ARGV) {
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my $storePath = shift @ARGV;
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# $storePath might be a symlink to the store, so resolve it.
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$storePath = (`$binDir/nix-store --query --resolve '$storePath'`
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or die "cannot resolve `$storePath'");
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chomp $storePath;
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print TOPLEVEL $storePath, "\n";
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# Get the closure of this path.
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my $pid = open(READ,
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"$binDir/nix-store --query --requisites '$storePath'|") or die;
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while (<READ>) {
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chomp;
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die "bad: $_" unless /^\//;
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$storePaths{$_} = "";
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}
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close READ or die "nix-store failed: $?";
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}
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foreach my $storePath (sort(keys %storePaths)) {
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print STDERR "packing `$storePath'...\n";
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$storePath =~ /\/([^\/]+)$/;
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my $name = $1;
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system("$binDir/nix-store --dump '$storePath' > $tmpDir/contents/$name") == 0
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or die "nix-store --dump failed on `$storePath': $?";
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system("$binDir/nix-store --query --references '$storePath' > $tmpDir/references/$name") == 0
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or die "nix-store --query --references failed on `$storePath': $?";
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system("$binDir/nix-store --query --deriver '$storePath' > $tmpDir/derivers/$name") == 0
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or die "nix-store --query --deriver failed on `$storePath': $?";
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}
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# Write a NAR archive of everything to standard output.
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system("nix-store --dump '$tmpDir'") == 0
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or die "nix-store --dump failed";
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