135 lines
2.7 KiB
Perl
135 lines
2.7 KiB
Perl
# ex:ts=8 sw=4:
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# $OpenBSD: Locks.pm,v 1.5 2010/12/06 13:20:45 espie Exp $
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#
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# Copyright (c) 2010 Marc Espie <espie@openbsd.org>
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#
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# Permission to use, copy, modify, and distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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use strict;
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use warnings;
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package DPB::Locks;
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use File::Path;
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use Fcntl;
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sub new
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{
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my ($class, $lockdir) = @_;
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File::Path::make_path($lockdir);
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bless {lockdir => $lockdir}, $class;
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}
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sub build_lockname
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{
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my ($self, $f) = @_;
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$f =~ tr|/|.|;
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return "$self->{lockdir}/$f";
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}
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sub simple_lockname
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{
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my ($self, $v) = @_;
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return $self->build_lockname($v->{pkgpath});
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}
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sub lockname
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{
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my ($self, $v) = @_;
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return $self->build_lockname($v->fullpkgpath);
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}
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sub dolock
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{
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my ($self, $name, $v) = @_;
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if (sysopen my $fh, $name, O_CREAT|O_EXCL|O_WRONLY, 0666) {
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print $fh "fullpkgpath=", $v->fullpkgpath, "\n";
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if (defined $v->{parent}) {
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print $fh "parent=", $v->{parent}->fullpkgpath, "\n";
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}
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return $fh;
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} else {
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return 0;
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}
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}
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sub lock
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{
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my ($self, $v) = @_;
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my $simple = $self->simple_lockname($v);
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my $fh = $self->dolock($simple, $v);
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if ($fh) {
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my $lk = $self->lockname($v);
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if ($simple eq $lk) {
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return $fh;
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}
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my $fh2 = $self->dolock($lk, $v);
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if ($fh2) {
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return $fh2;
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} else {
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$self->simple_unlock($v);
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}
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}
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return undef;
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}
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sub unlock
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{
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my ($self, $v) = @_;
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unlink($self->lockname($v));
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$self->simple_unlock($v);
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}
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sub simple_unlock
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{
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my ($self, $v) = @_;
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my $simple = $self->simple_lockname($v);
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if ($self->lockname($v) ne $simple) {
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unlink($simple);
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}
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}
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sub locked
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{
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my ($self, $v) = @_;
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return -e $self->lockname($v) || -e $self->simple_lockname($v);
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}
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sub recheck_errors
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{
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my ($self, $engine) = (@_);
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for my $name (qw(errors locks)) {
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my $e = $engine->{$name};
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$engine->{$name} = [];
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while (my $v = shift @$e) {
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if ($v->{info} && $engine->{builder}->check($v)) {
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$self->unlock($v);
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}
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if ($self->locked($v)) {
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push(@{$engine->{$name}}, $v);
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} else {
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if ($name eq 'errors') {
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$engine->rescan($v);
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} else {
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$engine->requeue($v);
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}
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}
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}
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}
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}
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1;
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