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)
88 lines
2.5 KiB
Text
88 lines
2.5 KiB
Text
#! @perl@ -w
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# This tool unpacks the closures created by "nix-pack-closure" and
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# adds them to the Nix store.
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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 $tmpDir = tempdir("nix-unpack-closure.XXXXXX", CLEANUP => 1, TMPDIR => 1)
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or die "cannot create a temporary directory";
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# Unpack the NAR archive on standard input.
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system("nix-store --restore '$tmpDir/unpacked'") == 0
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or die "nix-store --restore failed";
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open VALID, ">$tmpDir/validity" or die;
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# For each path in the closure that is not yet valid, add it to the
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# store. TODO: use proper locking. Or even better, let nix-store do
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# this.
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opendir(DIR, "$tmpDir/unpacked/contents") or die "cannot open directory: $!";
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foreach my $name (sort(readdir DIR)) {
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next if $name eq "." or $name eq "..";
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my $storePath = "@storedir@/$name"; # !!!
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# !!! this really isn't a good validity check!
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system "$binDir/nix-store --check-validity '$storePath' 2> /dev/null";
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if ($? != 0) {
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print STDERR "unpacking `$storePath'...\n";
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# !!! race
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system("@coreutils@/rm -rf '$storePath'") == 0
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or die "cannot remove `$storePath': $?";
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system("$binDir/nix-store --restore '$storePath' < '$tmpDir/unpacked/contents/$name'") == 0
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or die "nix-store --dump failed on `$storePath': $?";
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print VALID "$storePath\n";
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open DRV, "<$tmpDir/unpacked/derivers/$name" or die;
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my $deriver = <DRV>;
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chomp $deriver;
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$deriver = "" if $deriver eq "unknown-deriver";
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close DRV;
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my @refs;
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open REFS, "<$tmpDir/unpacked/references/$name" or die;
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while (<REFS>) {
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chomp;
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push @refs, $_;
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}
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close REFS;
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print VALID "$deriver\n";
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print VALID (scalar @refs), "\n";
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foreach my $ref (@refs) {
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print VALID "$ref\n";
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}
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}
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}
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closedir(DIR) or die;
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# Register the invalid paths as valid.
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system("nix-store --register-validity <'$tmpDir/validity'") == 0
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or die "nix-store --register-validity failed";
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# Show the top-level paths so that something useful can be done with
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# them, e.g., passing them to `nix-env -i'.
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if (-e "$tmpDir/unpacked/top-level") {
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open TOPLEVEL, "<$tmpDir/unpacked/top-level" or die;
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while (<TOPLEVEL>) { print "$_"; }
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close TOPLEVEL;
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}
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