91 lines
2 KiB
Plaintext
91 lines
2 KiB
Plaintext
#! @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 $minAge = 0;
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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 = $arg;
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}
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elsif ($arg eq "--min-age") {
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$i++;
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$minAge = undef;
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$minAge = $ARGV[$i];
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die "invalid minimum age" unless defined $minAge && $minAge =~ /^\d*$/;
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}
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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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# Run the collector with the roots we found.
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my $pid = open2(">&1", \*WRITE, "@bindir@/nix-store --gc $gcOper --min-age $minAge")
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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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