libexif/SOURCES/strip-gettext-nondeterminism
2021-10-08 12:39:31 +00:00

118 lines
3.1 KiB
Perl
Executable File

#!/usr/bin/perl
#
# This is a hacked version of gettext.pm from Debian's strip-nondeterminism project.
# It is a workaround for https://savannah.gnu.org/bugs/?49654
#
# Copyright 2016 Reiner Herrmann <reiner@reiner-h.de>
# Copyright 2016 Chris Lamb <lamby@debian.org>
#
# This file is part of strip-nondeterminism.
#
# strip-nondeterminism 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 3 of the License, or
# (at your option) any later version.
#
# strip-nondeterminism 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 strip-nondeterminism. If not, see <http://www.gnu.org/licenses/>.
#
use Time::Piece;
use POSIX qw(strftime);
use strict;
use warnings;
=head1 DEPRECATION PLAN
Situation unclear. Whilst #792687 is closed, many Gettext related files are
being normalised based on anecdotal viewings of build logs.
=cut
sub read_file($) {
my $filename = shift;
local $/ = undef;
open(my $fh, '<', $filename)
or die "Can't open file $filename for reading: $!";
binmode($fh);
my $buf = <$fh>;
close($fh);
return $buf;
}
sub normalize {
my ($mo_filename, %options) = @_;
my $fmt;
my $buf = read_file($mo_filename);
my $magic = unpack("V", substr($buf, 0*4, 4));
if ($magic == 0x950412DE) {
# little endian
$fmt = "V";
} elsif ($magic == 0xDE120495) {
# big endian
$fmt = "N";
} else {
# unknown format
return 0;
}
my ($revision, $nstrings, $orig_to, $trans_to)
= unpack($fmt x 4, substr($buf, 1*4, 4*4));
my $major = int($revision / 256);
my $minor = int($revision % 256);
return 0 if $major > 1;
my $modified = 0;
for (my $i=0; $i < $nstrings; $i++) {
my $len = unpack($fmt, substr($buf, $orig_to + $i*8, 4));
next if $len > 0;
my $offset = unpack($fmt, substr($buf, $orig_to + $i*8 + 4, 4));
my $trans_len = unpack($fmt, substr($buf, $trans_to + $i*8));
my $trans_offset = unpack($fmt, substr($buf, $trans_to + $i*8 + 4));
my $trans_msg = substr($buf, $trans_offset, $trans_len);
next unless $trans_msg =~ m/^POT-Creation-Date: (.*)/m;
my $pot_date = $1;
my $time;
eval {$time = Time::Piece->strptime($pot_date, "%Y-%m-%d %H:%M%z");};
next if $@;
my $new_time = strftime("%Y-%m-%d %H:%M+0000", gmtime(0));
$trans_msg
=~ s/\QPOT-Creation-Date: $pot_date\E/POT-Creation-Date: $new_time/;
print("Replaced POT-Creation-Date $pot_date with $new_time.\n");
next if length($trans_msg) != $trans_len;
$buf
= substr($buf, 0, $trans_offset)
. $trans_msg
. substr($buf, $trans_offset + $trans_len);
$modified = 1;
}
if ($modified) {
open(my $fh, '>', $mo_filename)
or die "Can't open file $mo_filename for writing: $!";
binmode($fh);
print $fh $buf;
close($fh);
}
return $modified;
}
print("Removing timestamp from " . $ARGV[0] . "...\n");
normalize($ARGV[0])