47 lines
1 KiB
Perl
Executable file
47 lines
1 KiB
Perl
Executable file
#! /usr/bin/perl -w
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use strict;
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use IPC::Open2;
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my $linkdir = "@localstatedir@/nix/links";
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my $storedir = "@prefix@/store";
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my %alive;
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my $keepsuccessors = 0;
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my $invert = 0;
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foreach my $arg (@ARGV) {
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if ($arg eq "--keep-successors") { $keepsuccessors = 1; }
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elsif ($arg eq "--invert") { $invert = 1; }
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else { die "unknown argument `$arg'" };
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}
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my $extraarg = "";
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if ($keepsuccessors) { $extraarg = "--include-successors"; };
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my $pid = open2(\*READ, \*WRITE, "nix --query --requisites $extraarg \$(cat $linkdir/*.id)")
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or die "determining live paths";
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close WRITE;
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while (<READ>) {
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chomp;
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$alive{$_} = 1;
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if ($invert) { print "$_\n"; };
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}
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close READ;
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waitpid $pid, 0;
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$? == 0 or die "determining live paths";
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exit 0 if ($invert);
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opendir(DIR, $storedir) or die "cannot opendir $storedir: $!";
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my @names = readdir(DIR);
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closedir DIR;
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foreach my $name (@names) {
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next if ($name eq "." || $name eq "..");
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$name = "$storedir/$name";
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if (!$alive{$name}) {
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print "$name\n";
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}
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}
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