lix/scripts/nix-collect-garbage.in
Eelco Dolstra 66e94d3275 * Improvements to profiles. Generations are now per-profile, e.g.,
default -> default-94-link
  default-82-link -> /nix/store/cc4480...
  default-83-link -> /nix/store/caeec8...
  ...
  default-94-link -> /nix/store/2896ca...
  experimental -> experimental-2-link
  experimental-1-link -> /nix/store/cc4480...
  experimental-2-link -> /nix/store/a3148f...

* `--profile' / `-p' -> `--switch-profile' / `-S'
* `--link' / `-l' -> `--profile' / `-p'
* The default profile is stored in $prefix/var/nix/profiles.
  $prefix/var/nix/links is gone.  Profiles can be stored anywhere.
* The current profile is now referenced from ~/.nix-profile, not
  ~/.nix-userenv.
* The roots to the garbage collector now have extension `.gcroot', not
  `.id'.
2004-02-06 10:30:20 +00:00

63 lines
1.4 KiB
Perl
Executable file

#! /usr/bin/perl -w
use strict;
use IPC::Open2;
my $linkdir = "@localstatedir@/nix/profiles";
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 =~ /.gcroot$/));
open ROOT, "<$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";
}
}