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* Added a tool to find additional roots for the garbage collector,

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such as open files, current directories, mmaped files, etc.  This is
  inherently unportable, but it's easy to adapt this script to other
  platforms.  Currently we call `lsof' and try to read various bits in
  /proc/NNN.

  The goal is to prevent the garbage collector from removing store
  paths that are no longer reachable from a permanent root but that
  are still in use (for instance, after the user has done "nix-env -e"
  on a running program).
This commit is contained in:
Eelco Dolstra 2006-07-19 16:49:59 +00:00
parent 88e54153dc
commit ebcccbd358
2 changed files with 62 additions and 2 deletions
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6
scripts/Makefile.am
View file

@ -7,13 +7,14 @@ noinst_SCRIPTS = nix-profile.sh generate-patches.pl
nix-pull nix-push: readmanifest.pm readconfig.pm download-using-manifests.pl
install-exec-local: readmanifest.pm download-using-manifests.pl
install-exec-local: readmanifest.pm download-using-manifests.pl find-runtime-roots.pl
$(INSTALL) -d $(DESTDIR)$(sysconfdir)/profile.d
$(INSTALL_PROGRAM) nix-profile.sh $(DESTDIR)$(sysconfdir)/profile.d/nix.sh
$(INSTALL) -d $(DESTDIR)$(libexecdir)/nix
$(INSTALL_DATA) readmanifest.pm $(DESTDIR)$(libexecdir)/nix
$(INSTALL_DATA) readconfig.pm $(DESTDIR)$(libexecdir)/nix
$(INSTALL_PROGRAM) download-using-manifests.pl $(DESTDIR)$(libexecdir)/nix
$(INSTALL_PROGRAM) find-runtime-roots.pl $(DESTDIR)$(libexecdir)/nix
$(INSTALL) -d $(DESTDIR)$(sysconfdir)/nix
include ../substitute.mk
@ -27,4 +28,5 @@ EXTRA_DIST = nix-collect-garbage.in \
nix-build.in \
download-using-manifests.pl.in \
generate-patches.pl.in \
nix-pack-closure.in nix-unpack-closure.in
nix-pack-closure.in nix-unpack-closure.in \
find-runtime-roots.pl.in

58
scripts/find-runtime-roots.pl.in Normal file
View file

@ -0,0 +1,58 @@
#! @perl@ -w
use strict;
my $procDir = "/proc";
sub readProc {
return unless -d $procDir;
opendir DIR, $procDir or return;
foreach my $name (readdir DIR) {
next unless $name =~ /^\d+$/;
my $process = "$procDir/$name";
#print STDERR "=== $process\n";
my $target;
print "$target\n" if $target = readlink "$process/exe";
print "$target\n" if $target = readlink "$process/cwd";
if (opendir FDS, "$process/fd") {
foreach my $name (readdir FDS) {
$target = readlink "$process/fd/$name";
print "$target\n" if $target && substr($target, 0, 1) eq "/";
}
closedir FDS;
}
if (open MAP, "<$process/maps") {
while (<MAP>) {
next unless /^ \s* \S+ \s+ \S+ \s+ \S+ \s+ \S+ \s+ \S+ \s+ (\/\S+) \s* $/x;
print "$1\n";
}
close MAP;
}
}
closedir DIR;
}
sub lsof {
return unless open LSOF, "lsof -b -w -F n |";
while (<LSOF>) {
next unless /^n (\/ .*)$/x;
print $1, "\n";
}
close LSOF;
}
readProc;
lsof;