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Code Activity

* Move root finding from nix-collect-garbage' to nix-store --gc'.

Browse source 
This was necessary becase root finding must be done after
  acquisition of the global GC lock.

  This makes `nix-collect-garbage' obsolete; it is now just a wrapper
  around `nix-store --gc'.

* Automatically remove stale GC roots (i.e., indirect GC roots that
  point to non-existent paths).
This commit is contained in:
Eelco Dolstra 2005-02-01 15:05:32 +00:00
parent 630ae0c9d7
commit 65b6c8ab4c
4 changed files with 75 additions and 111 deletions
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85
scripts/nix-collect-garbage.in
View file

@ -1,83 +1,2 @@
#! @perl@ -w
use strict;
use IPC::Open2;
my $rootsDir = "@localstatedir@/nix/gcroots";
my $storeDir = "@storedir@";
my %alive;
my $gcOper = "--delete";
my $extraArgs = "";
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 =~ /^-v+$/) {
$extraArgs = "$extraArgs $arg";
}
else { die "unknown argument `$arg'" };
}
# Recursively finds all symlinks to the store 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 "..";
my $path = $dir . "/" . $name;
if (-l $path) {
my $target = readlink $path
or die "cannot read symlink `$path': $!";
if (substr($target, 0, length $storeDir) eq $storeDir) {
# We're only interested in the store-level part.
$target = substr($target, length $storeDir);
$target = "$storeDir/$target";
push @roots, $target;
}
elsif ($followSymlinks && -d $path) {
findRoots 0, $path;
}
}
elsif (-d $path) {
findRoots $followSymlinks, $path;
}
}
}
# 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 $extraArgs")
or die "cannot run `nix-store --gc'";
foreach my $root (@roots) {
print WRITE "$root\n";
}
close WRITE;
waitpid $pid, 0;
$? == 0 or die "`nix-store --gc' failed";
#! @shell@ -e
exec @bindir@/nix-store --gc "$@"