101 lines
2.2 KiB
Plaintext
Executable file
101 lines
2.2 KiB
Plaintext
Executable file
#! @perl@ -w
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use strict;
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use IPC::Open2;
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my $rootsDir = "@localstatedir@/nix/gcroots";
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my $storeDir = "@storedir@";
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my %alive;
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my $keepSuccessors = 1;
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my $invert = 0;
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my @roots = ();
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# Parse the command line.
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foreach my $arg (@ARGV) {
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if ($arg eq "--no-successors") { $keepSuccessors = 0; }
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elsif ($arg eq "--invert") { $invert = 1; }
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else { die "unknown argument `$arg'" };
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}
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# Read all GC roots from the given file.
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sub readRoots {
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my $fileName = shift;
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open ROOT, "<$fileName" or die "cannot open `$fileName': $!";
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while (<ROOT>) {
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chomp;
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foreach my $root (split ' ') {
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die "bad root `$root' in file `$fileName'"
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unless $root =~ /^\S+$/;
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push @roots, $root;
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}
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}
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close ROOT;
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}
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# Recursively finds all *.gcroot files in the given directory.
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sub findRoots;
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sub findRoots {
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my $followSymlinks = shift;
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my $dir = shift;
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opendir(DIR, $dir) or die "cannot open directory `$dir': $!";
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my @names = readdir DIR or die "cannot read directory `$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 = $dir . "/" . $name;
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if ($name =~ /.gcroot$/ && -f $name) {
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readRoots $name;
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}
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elsif (-d $name) {
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if ($followSymlinks || !-l $name) {
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findRoots 0, $name;
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}
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}
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}
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}
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# Find GC roots, starting at $rootsDir.
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findRoots 1, $rootsDir;
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# Determine all store paths reachable from the roots.
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my $extraarg = "";
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if ($keepSuccessors) { $extraarg = "--include-successors"; };
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my $pid = open2(\*READ, \*WRITE, "@bindir@/nix-store --query --requisites $extraarg @roots")
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or die "determining live paths";
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close WRITE;
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while (<READ>) {
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chomp;
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$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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# Using that information, find all store paths *not* reachable from
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# the roots.
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opendir(DIR, $storeDir) or die "cannot open directory $storeDir: $!";
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foreach my $name (readdir DIR) {
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next if ($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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closedir DIR;
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