#!/usr/bin/perl
# script to downgrade from cyrus imapd 1.6.2+ to earlier.
# do NOT run this script while imapd's are running
# $Id: undohash,v 1.4 2005/03/05 00:37:40 dasenbro Exp $
# 
# Copyright (c) 2000 Carnegie Mellon University.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer. 
#
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
#
# 3. The name "Carnegie Mellon University" must not be used to
#    endorse or promote products derived from this software without
#    prior written permission. For permission or any other legal
#    details, please contact  
#      Office of Technology Transfer
#      Carnegie Mellon University
#      5000 Forbes Avenue
#      Pittsburgh, PA  15213-3890
#      (412) 268-4387, fax: (412) 268-7395
#      tech-transfer@andrew.cmu.edu
#
# 4. Redistributions of any form whatsoever must retain the following
#    acknowledgment:
#    "This product includes software developed by Computing Services
#     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
#
# CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
# FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
# AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
# OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
require 5;

$| = 1;

$imapdconf = shift || "/etc/imapd.conf";
$hashispool = 0;

open CONF, $imapdconf or die "can't open $imapdconf";
while (<CONF>) {
    print;
    if (/^configdirectory:\s(.*)$/) {
	$conf = $1;
    }
    if (/^partition-.*:\s(.*)$/) {
	if (grep /$1/, @parts) {
	    next;
	}
	push @parts, $1;
    }
    if (/^hashimapspool:\s(1|t|yes|on)/) {
	$hashispool = 1;
	print "i will also unhash partitions.\n";
    }
}
close CONF;

print "downgrading configuration directory $conf...";
chdir $conf or die "couldn't change to $conf";

# *** user subdirectory; holds subscription files
print "user ";
chdir "user" or die "couldn't change to user subdir";
foreach $i ("a".."z") { 
    opendir SUB, $i;
    while ($s = readdir SUB) {
	if ($s =~ /^\./s) { next; }
	rename("$i/$s", "$s") or die "couldn't move $s back!";
    }
    closedir SUB;
    rmdir "$i" or die "couldn't remove $i";
}
chdir "..";

# *** quota subdirectory; holds quota files for each quotaroot
print "quota ";
chdir "quota" or die "couldn't change to quota subdir";

# first, create directories we know can't conflict with existing files
foreach $i ("a".."z") {
    rename ($i, ".$i") or die "couldn't rename $i to .$i";
    opendir SUB, ".$i";
    while ($s = readdir SUB) {
	if ($s =~ /^\./s) { next; }
	rename(".$i/$s", $s) or die "couldn't move $s back!";
    }
    closedir SUB;
    rmdir ".$i" or die "couldn't remove .$i";
}
chdir "..";

print "done\n";

# *** now for each data partition
while ($hashispool && ($part = shift @parts)) {
    print "downgrading data partition $part...";
    chdir $part or die "couldn't chdir to $part";
    
    foreach $i ("a".."z") {
	rename ("$i", ".$i") or die "couldn't rename $i to .$i";
    }

    # process each subdir
    foreach $i ("a".."z") {
	print "$i ";

	opendir SUB, ".$i";
	while ($s = readdir SUB) {
	    if ($s =~ /^\./s) { next; }
	    mkdir $s, 0755;	# ignore errors as it might already exist

	    opendir MV, ".$i/$s";
	    while ($t = readdir MV) {
		if ($t =~ /^\./s) { next; }
		rename (".$i/$s/$t", "$s/$t") or 
		    die "couldn't rename .$i/$s/$t to $s/$t";
	    }
	    closedir MV;
	}
	closedir SUB;
	rmdir ".$i";
    }
    
    print "done\n";
}
