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* A garbage collector for installed packages. nix-collect-garbage 

doesn't actually delete any packages, it just prints their
  descriptor hashes.  So we can do

    nix info $(nix-collect-garbage)

  to print out the ids of the packages that would be deleted, and

    nix delpkg $(nix-collect-garbage)

  to actually delete them.
This commit is contained in:
Eelco Dolstra 2003-04-09 13:03:00 +00:00
parent 30a6122f80
commit f7526febe4
2 changed files with 23 additions and 1 deletions
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2
scripts/Makefile.am
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@ -1,4 +1,4 @@
bin_SCRIPTS = nix-generate-regscript nix-switch
bin_SCRIPTS = nix-generate-regscript nix-switch nix-collect-garbage
install-exec-local:
$(INSTALL) -d $(sysconfdir)/profile.d

22
scripts/nix-collect-garbage Executable file
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@ -0,0 +1,22 @@
#! /usr/bin/perl -w
my $prefix = $ENV{"NIX"} || "/nix"; # !!! use prefix
my $linkdir = "$prefix/var/nix/links";
my %alive;
open HASHES, "nix closure \$(cat $linkdir/*.hash) |";
while (<HASHES>) {
chomp;
$alive{$_} = 1;
}
close HASHES;
open HASHES, "nix listinst |";
while (<HASHES>) {
chomp;
if (!$alive{$_}) {
print "$_\n";
}
}
close HASHES;