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#!/usr/bin/perl
# This script will either prefix all symlink values with the string
# "/rsyncd-munged/" or remove that prefix.
use strict;
use Getopt::Long;
my $SYMLINK_PREFIX = '/rsyncd-munged/';
my $munge_opt;
&GetOptions(
'munge' => sub { $munge_opt = 1 },
'unmunge' => sub { $munge_opt = 0 },
'all' => \( my $all_opt ),
'help|h' => \( my $help_opt ),
) or &usage;
&usage if $help_opt || !defined $munge_opt;
my $munged_re = $all_opt ? qr/^($SYMLINK_PREFIX)+(?=.)/ : qr/^$SYMLINK_PREFIX(?=.)/;
push(@ARGV, '.') unless @ARGV;
open(PIPE, '-|', 'find', @ARGV, '-type', 'l') or die $!;
while (<PIPE>) {
chomp;
my $lnk = readlink($_) or next;
if ($munge_opt) {
next if !$all_opt && $lnk =~ /$munged_re/;
$lnk =~ s/^/$SYMLINK_PREFIX/;
} else {
next unless $lnk =~ s/$munged_re//;
}
if (!unlink($_)) {
warn "Unable to unlink symlink: $_ ($!)\n";
} elsif (!symlink($lnk, $_)) {
warn "Unable to recreate symlink: $_ -> $lnk ($!)\n";
} else {
print "$_ -> $lnk\n";
}
}
close PIPE;
exit;
sub usage
{
die <<EOT;
Usage: munge-symlinks --munge|--unmunge [--all] [DIR|SYMLINK...]
--munge Add the $SYMLINK_PREFIX prefix to symlinks if not already
present, or always when combined with --all.
--unmunge Remove one $SYMLINK_PREFIX prefix from symlinks or all
such prefixes with --all.
See the "munge symlinks" option in the rsyncd.conf manpage for more details.
EOT
}