File: | Dpkg/Lock.pm |
Coverage: | 61.5% |
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1 | # Copyright © 2011 Raphaël Hertzog <hertzog@debian.org> | ||||||
2 | # Copyright © 2012 Guillem Jover <guillem@debian.org> | ||||||
3 | # | ||||||
4 | # This program is free software; you can redistribute it and/or modify | ||||||
5 | # it under the terms of the GNU General Public License as published by | ||||||
6 | # the Free Software Foundation; either version 2 of the License, or | ||||||
7 | # (at your option) any later version. | ||||||
8 | # | ||||||
9 | # This program is distributed in the hope that it will be useful, | ||||||
10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||||||
11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||||||
12 | # GNU General Public License for more details. | ||||||
13 | # | ||||||
14 | # You should have received a copy of the GNU General Public License | ||||||
15 | # along with this program. If not, see <https://www.gnu.org/licenses/>. | ||||||
16 | |||||||
17 | package Dpkg::Lock; | ||||||
18 | |||||||
19 | 1 1 1 | 3 1 11 | use strict; | ||||
20 | 1 1 1 | 2 1 30 | use warnings; | ||||
21 | |||||||
22 | our $VERSION = '0.01'; | ||||||
23 | our @EXPORT = qw( | ||||||
24 | file_lock | ||||||
25 | ); | ||||||
26 | |||||||
27 | 1 1 1 | 2 1 12 | use Exporter qw(import); | ||||
28 | 1 1 1 | 2 0 55 | use Fcntl qw(:flock); | ||||
29 | |||||||
30 | 1 1 1 | 117 1 24 | use Dpkg::Gettext; | ||||
31 | 1 1 1 | 143 1 75 | use Dpkg::ErrorHandling; | ||||
32 | |||||||
33 | sub file_lock($$) { | ||||||
34 | 0 | 0 | my ($fh, $filename) = @_; | ||||
35 | |||||||
36 | # A strict dependency on libfile-fcntllock-perl being it an XS module, | ||||||
37 | # and dpkg-dev indirectly making use of it, makes building new perl | ||||||
38 | # package which bump the perl ABI impossible as these packages cannot | ||||||
39 | # be installed alongside. | ||||||
40 | 0 | eval q{ | |||||
41 | pop @INC if $INC[-1] eq '.'; | ||||||
42 | use File::FcntlLock; | ||||||
43 | }; | ||||||
44 | 0 | if ($@) { | |||||
45 | # On Linux systems the flock() locks get converted to file-range | ||||||
46 | # locks on NFS mounts. | ||||||
47 | 0 | if ($^O ne 'linux') { | |||||
48 | 0 | warning(g_('File::FcntlLock not available; using flock which is not NFS-safe')); | |||||
49 | } | ||||||
50 | 0 | flock($fh, LOCK_EX) | |||||
51 | or syserr(g_('failed to get a write lock on %s'), $filename); | ||||||
52 | } else { | ||||||
53 | 0 | eval q{ | |||||
54 | my $fs = File::FcntlLock->new(l_type => F_WRLCK); | ||||||
55 | $fs->lock($fh, F_SETLKW) | ||||||
56 | or syserr(g_('failed to get a write lock on %s'), $filename); | ||||||
57 | } | ||||||
58 | } | ||||||
59 | } | ||||||
60 | |||||||
61 | 1; |