gecko-dev/config/build-list.pl
cls%seawood.org a18e2a473a Add support for adding multiple items to list at once.
Read entire file into mem to avoid overhead of exec'ing multiple greps.
Bug #59454 r=bryner sr=alecf
2001-09-12 06:32:35 +00:00

96 lines
2.0 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> [<entry> <entry>]
#
# -l do not attempt flock the file.
use Fcntl qw(:DEFAULT :flock);
use Getopt::Std;
use mozLock;
sub usage() {
print "$0 [-l] <filename> <entry>\n";
exit(1);
}
$nofilelocks = 0;
getopts("l");
$nofilelocks = 1 if defined($::opt_l);
$file = shift;
undef @entrylist;
while ($entry = shift) {
push @entrylist, $entry;
}
$lockfile = $file . ".lck";
# touch the file if it doesn't exist
if ( ! -e "$file") {
$now = time;
utime $now, $now, $file;
}
# This needs to be atomic
mozLock($lockfile) unless $nofilelocks;
# Read entire file into mem
undef @inbuf;
if ( -e "$file" ) {
open(IN, "$file") || die ("$file: $!\n");
while ($tmp = <IN>) {
chomp($tmp);
push @inbuf, $tmp;
}
close(IN);
}
undef @outbuf;
# Add each entry to file if it's not already there
foreach $entry (@entrylist) {
push @outbuf, $entry if (!grep(/^$entry$/, @inbuf));
}
$count = $#outbuf + 1;
# Append new entry to file
if ($count) {
open(OUT, ">>$file") || die ("$file: $!\n");
foreach $entry (@outbuf) {
print OUT "$entry\n";
}
close(OUT);
}
mozUnlock($lockfile) unless $nofilelocks;
exit(0);