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#! /usr/bin/perl -w
use strict;
use IPC::Open2;
my $linkdir = "@localstatedir@/nix/links";
my $storedir = "@prefix@/store";
my %alive;
my $keepsuccessors = 1;
my $invert = 0;
foreach my $arg (@ARGV) {
if ($arg eq "--no-successors") { $keepsuccessors = 0; }
elsif ($arg eq "--invert") { $invert = 1; }
else { die "unknown argument `$arg'" };
}
opendir(DIR, $linkdir) or die "cannot open directory $linkdir: $!";
my @links = readdir DIR or die "cannot read directory $linkdir: $!";
closedir DIR;
my @roots;
foreach my $link (@links) {
$link = $linkdir . "/" . $link;
next if (!($link =~ /.id$/));
open ROOT, "<$link" or die "cannot open $link: $!";
my $root = <ROOT>;
chomp $root;
close ROOT;
push @roots, $root;
}
my $extraarg = "";
if ($keepsuccessors) { $extraarg = "--include-successors"; };
my $pid = open2(\*READ, \*WRITE, "nix-store --query --requisites $extraarg @roots")
or die "determining live paths";
close WRITE;
while (<READ>) {
chomp;
$alive{$_} = 1;
if ($invert) { print "$_\n"; };
}
close READ;
waitpid $pid, 0;
$? == 0 or die "determining live paths";
exit 0 if ($invert);
opendir(DIR, $storedir) or die "cannot open directory $storedir: $!";
my @names = readdir DIR;
closedir DIR;
foreach my $name (@names) {
next if ($name eq "." || $name eq "..");
$name = "$storedir/$name";
if (!$alive{$name}) {
print "$name\n";
}
}
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