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