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-rw-r--r--scripts/Dpkg/Lock.pm61
1 files changed, 61 insertions, 0 deletions
diff --git a/scripts/Dpkg/Lock.pm b/scripts/Dpkg/Lock.pm
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+++ b/scripts/Dpkg/Lock.pm
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+# Copyright © 2011 Raphaël Hertzog <hertzog@debian.org>
+# Copyright © 2012 Guillem Jover <guillem@debian.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+package Dpkg::Lock;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+our @EXPORT = qw(
+ file_lock
+);
+
+use Exporter qw(import);
+use Fcntl qw(:flock);
+
+use Dpkg::Gettext;
+use Dpkg::ErrorHandling;
+
+sub file_lock($$) {
+ my ($fh, $filename) = @_;
+
+ # A strict dependency on libfile-fcntllock-perl being it an XS module,
+ # and dpkg-dev indirectly making use of it, makes building new perl
+ # package which bump the perl ABI impossible as these packages cannot
+ # be installed alongside.
+ eval q{
+ pop @INC if $INC[-1] eq '.';
+ use File::FcntlLock;
+ };
+ if ($@) {
+ # On Linux systems the flock() locks get converted to file-range
+ # locks on NFS mounts.
+ if ($^O ne 'linux') {
+ warning(g_('File::FcntlLock not available; using flock which is not NFS-safe'));
+ }
+ flock($fh, LOCK_EX)
+ or syserr(g_('failed to get a write lock on %s'), $filename);
+ } else {
+ eval q{
+ my $fs = File::FcntlLock->new(l_type => F_WRLCK);
+ $fs->lock($fh, F_SETLKW)
+ or syserr(g_('failed to get a write lock on %s'), $filename);
+ }
+ }
+}
+
+1;