gecko-dev/config/build-list.pl

72 lines
1.6 KiB
Perl
Executable File

#!env perl
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is mozilla.org code.
#
# The Initial Developer of the Original Code is Netscape
# Communications Corporation. Portions created by Netscape are
# Copyright (C) 2001 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s):
# Christopher Seawood <cls@seawood.org>
#
# A generic script to add entries to a file
# if the entry does not already exist
#
# Usage: $0 [-l] <filename> <entry>
#
# -l do not attempt flock the file.
use Fcntl qw(:DEFAULT :flock);
use Getopt::Std;
sub usage() {
print "$0 [-l] <filename> <entry>\n";
exit(1);
}
$nofilelocks = 0;
getopts("l");
$nofilelocks = 1 if defined($::opt_l);
$file = shift;
$entry = shift;
# touch the file if it doesn't exist
if ( ! -e "$file") {
$now = time;
utime $now, $now, $file;
}
# This needs to be atomic
open(OUT, ">>$file") || die ("$file: $!\n");
flock(OUT, LOCK_EX) unless $nofilelocks;
open(RES, "grep -c '^$entry\$' $file |") or $err = $!;
if ($err) {
flock(OUT,LOCK_UN) unless $nofilelocks;
die ("grep: $err\n");
}
chomp($val = <RES>);
close(RES);
if (!$val) {
print OUT "$entry\n";
}
flock(OUT, LOCK_UN) unless $nofilelocks;
close(OUT);
exit(0);