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author | Eelco Dolstra <e.dolstra@tudelft.nl> | 2003-04-09T12·46+0000 |
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committer | Eelco Dolstra <e.dolstra@tudelft.nl> | 2003-04-09T12·46+0000 |
commit | 30a6122f8061e8c3ac2d96078b75aafa63101f02 (patch) | |
tree | d38719bce8c3d77fb4d8b6d0a3426526d0c9fdc7 | |
parent | b762f4df7f6b8d0a4b306fc7e1c2633c4802d1c2 (diff) |
* When we activate a descriptor in nix-switch, remember its hash.
This allows us to find out all `live' packages on the system by doing nix closure $(cat /nix/var/nix/links/*.hash) which will print out the activated configurations and all packages referenced by them. We could then garbage collect unused packages by deleting the difference between `nix listinst' and the set returned by `nix closure ...'.
-rwxr-xr-x | scripts/nix-switch | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/scripts/nix-switch b/scripts/nix-switch index 74bcef8566f9..aec61cbfe147 100755 --- a/scripts/nix-switch +++ b/scripts/nix-switch @@ -20,11 +20,17 @@ chomp $id; my $nr = 0; while (-e "$linkdir/$id-$nr") { $nr++; } my $link = "$linkdir/$id-$nr"; -print "$pkgdir\n"; # Create a symlink from $link to $pkgdir. symlink($pkgdir, $link) or die "cannot create $link"; +# Also store the hash of $pkgdir. This is useful for garbage +# collection and the like. +my $hashfile = "$linkdir/$id-$nr.hash"; +open HASH, "> $hashfile" or die "cannot create $hashfile"; +print HASH "$hash\n"; +close HASH; + # Make $link the current generation by pointing $linkdir/current to # it. The rename() system call is supposed to be essentially atomic # on Unix. That is, if we have links `current -> X' and `new_current |