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#! @perl@ -w
use strict;
use IPC::Open2;
my $rootsDir = "@localstatedir@/nix/gcroots";
my $storeDir = "@storedir@";
my %alive;
my $gcOper = "--delete";
my $minAge = 0;
my @roots = ();
# Parse the command line.
for (my $i = 0; $i < scalar @ARGV; $i++) {
my $arg = $ARGV[$i];
if ($arg eq "--delete" || $arg eq "--print-live" || $arg eq "--print-dead") {
$gcOper = $arg;
}
elsif ($arg eq "--min-age") {
$i++;
$minAge = undef;
$minAge = $ARGV[$i];
die "invalid minimum age" unless defined $minAge && $minAge =~ /^\d*$/;
}
else { die "unknown argument `$arg'" };
}
# Read all GC roots from the given file.
sub readRoots {
my $fileName = shift;
open ROOT, "<$fileName" or die "cannot open `$fileName': $!";
while (<ROOT>) {
chomp;
foreach my $root (split ' ') {
die "bad root `$root' in file `$fileName'"
unless $root =~ /^\S+$/;
push @roots, $root;
}
}
close ROOT;
}
# Recursively finds all *.gcroot files in the given directory.
sub findRoots;
sub findRoots {
my $followSymlinks = shift;
my $dir = shift;
opendir(DIR, $dir) or die "cannot open directory `$dir': $!";
my @names = readdir DIR or die "cannot read directory `$dir': $!";
closedir DIR;
foreach my $name (@names) {
next if $name eq "." || $name eq "..";
$name = $dir . "/" . $name;
if ($name =~ /.gcroot$/ && -f $name) {
readRoots $name;
}
elsif (-d $name) {
if ($followSymlinks || !-l $name) {
findRoots 0, $name;
}
}
}
}
# Find GC roots, starting at $rootsDir.
findRoots 1, $rootsDir;
# Run the collector with the roots we found.
my $pid = open2(">&1", \*WRITE, "@bindir@/nix-store --gc $gcOper --min-age $minAge")
or die "cannot run `nix-store --gc'";
foreach my $root (@roots) {
print WRITE "$root\n";
}
close WRITE;
waitpid $pid, 0;
$? == 0 or die "`nix-store --gc' failed";
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