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* Fix and simplify the garbage collector (it's still not concurrent,

Browse source 
though).  In particular it's now much easier to register a GC root.
  Just place a symlink to whatever store path it is that you want to
  keep in /nix/var/nix/gcroots.
This commit is contained in:
Eelco Dolstra 2005-01-27 15:21:29 +00:00
parent 59682e6188
commit c505702265
10 changed files with 124 additions and 109 deletions
Download patch file Download diff file Expand all files Collapse all files

2
scripts/nix-build.in
View file

@ -23,7 +23,7 @@ for i in "$@"; do
for j in $storeExprs; do
echo "store expression is $j" >&2
done
outPaths=$(@bindir@/nix-store -qnfv $extraArgs $storeExprs)
outPaths=$(@bindir@/nix-store -rv $extraArgs $storeExprs)
for j in $outPaths; do
echo "$j"
if test -z "$noLink"; then

53
scripts/nix-collect-garbage.in
View file

@ -9,7 +9,6 @@ my $storeDir = "@storedir@";
my %alive;
my $gcOper = "--delete";
my $minAge = 0;
my @roots = ();
@ -20,33 +19,11 @@ for (my $i = 0; $i < scalar @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.
# Recursively finds all symlinks to the store in the given directory.
sub findRoots;
sub findRoots {
my $followSymlinks = shift;
@ -58,14 +35,26 @@ sub findRoots {
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;
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;
}
}
@ -77,7 +66,7 @@ findRoots 1, $rootsDir;
# Run the collector with the roots we found.
my $pid = open2(">&1", \*WRITE, "@bindir@/nix-store --gc $gcOper --min-age $minAge")
my $pid = open2(">&1", \*WRITE, "@bindir@/nix-store --gc $gcOper")
or die "cannot run `nix-store --gc'";
foreach my $root (@roots) {