c505702265
though). In particular it's now much easier to register a GC root. Just place a symlink to whatever store path it is that you want to keep in /nix/var/nix/gcroots.
79 lines
1.8 KiB
Text
79 lines
1.8 KiB
Text
#! @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 $gcOper = "--delete";
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my @roots = ();
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# Parse the command line.
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for (my $i = 0; $i < scalar @ARGV; $i++) {
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my $arg = $ARGV[$i];
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if ($arg eq "--delete" || $arg eq "--print-live" || $arg eq "--print-dead") {
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$gcOper = $arg;
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}
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else { die "unknown argument `$arg'" };
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}
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# Recursively finds all symlinks to the store 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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my $path = $dir . "/" . $name;
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if (-l $path) {
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my $target = readlink $path
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or die "cannot read symlink `$path': $!";
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if (substr($target, 0, length $storeDir) eq $storeDir) {
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# We're only interested in the store-level part.
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$target = substr($target, length $storeDir);
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$target = "$storeDir/$target";
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push @roots, $target;
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}
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elsif ($followSymlinks && -d $path) {
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findRoots 0, $path;
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}
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}
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elsif (-d $path) {
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findRoots $followSymlinks, $path;
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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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# Run the collector with the roots we found.
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my $pid = open2(">&1", \*WRITE, "@bindir@/nix-store --gc $gcOper")
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or die "cannot run `nix-store --gc'";
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foreach my $root (@roots) {
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print WRITE "$root\n";
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}
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close WRITE;
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waitpid $pid, 0;
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$? == 0 or die "`nix-store --gc' failed";
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