1#! /usr/bin/perl
2
3# $Id: ldifuniq.pl,v 1.1 2002/08/24 15:11:21 kartik_subbarao Exp $
4
5=head1 NAME
6
7ldifuniq.pl - Culls unique entries from a reference file with respect to a
8comparison file.
9
10=head1 DESCRIPTION
11
12ldifuniq.pl takes as input two LDIF files, a reference file and a comparison
13file. Each entry in the reference file is compared to its counterpart in the
14comparison file. If it does not have a counterpart, or if the counterpart is
15not identical, the reference entry is printed to standard output. Otherwise no
16output is generated. This behavior is analogous to the -u option of the uniq
17command.
18
19=head1 SYNOPSIS
20
21ldifuniq.pl reffile.ldif cmpfile.ldif
22
23=head1 AUTHOR
24
25Kartik Subbarao E<lt>subbarao@computer.orgE<gt>
26
27=cut
28
29
30use MIME::Base64;
31
32use strict;
33
34
35my $reffile = $ARGV[0];
36my $cmpfile = $ARGV[1];
37
38die "usage: $0 reffile cmpfile\n" unless $reffile && $cmpfile;
39
40$/ = "";
41
42
43sub getdn {
44	my $rec = shift;
45	my $dn;
46
47	1 while s/^(dn:.*)?\n /$1/im; # Handle line continuations
48	if (/^dn(::?) (.*)$/im) {
49		$dn = $2;
50		$dn = decode_base64($dn) if $1 eq '::';
51	}
52
53	$dn;
54}
55
56open(CMPFH, $cmpfile) || die "$cmpfile: $!\n";
57my (%cmpdnpos, $pos); $pos = 0;
58while (<CMPFH>) {
59	my $dn = getdn($_);
60	$cmpdnpos{$dn} = $pos;
61	$pos = tell;
62}
63
64open(REFFH, $reffile) || die "$reffile: $!\n";
65while (<REFFH>) {
66	my $refrec = $_; $refrec .= "\n" if $refrec !~ /\n\n$/;
67	my $dn = getdn($refrec);
68	my $pos = $cmpdnpos{$dn};
69	if ($pos eq undef) {
70		print $refrec; next; # Not in cmpfile, print the entry.
71	}
72	seek(CMPFH, $pos, 0);
73	my $cmprec = <CMPFH>; $cmprec .= "\n" if $cmprec !~ /\n\n$/;
74	print $refrec if $refrec ne $cmprec;
75}
76