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