#!/usr/bin/php4 -q
<?php

###############################################################
#
#  This handler slowly creates a backup of each user's maildir
#  to a remote server. It is designed to be run with low overhead
#  in terms of cpu and bandwidth so it runs pretty slow.
#
##############################################################

getconf rotate yes
getconf remove yes

getconf loadlimit 5
getconf speedlimit 0
getconf keepdaily 7
getconf keepweekly 4

getconf srcdir /var/maildir
getconf destdir
getconf desthost
getconf destport 22
getconf destuser

# used for testing
getconf letter
getconf user

[ -d $srcdir ] || fatal "source directory $srcdir doesn't exist"

[ ! $test ] || testflags="--dry-run -v"
rsyncflags="$testflags -e 'ssh -p $destport'"
flags_mail="$rsyncflags --archive --ignore-existing --delete --numeric-ids --size-only --bwlimit=$speedlimit"
flags_folders="$rsyncflags --archive --delete --numeric-ids"
excludes='--exclude ".Trash/*" --exclude ".Mistakes/*" --exclude ".Spam/*"'

# see if we can login
debug "ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1'"
if [ ! $test ]; then
	result=`ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1' 2>&1`
	if [ "$result" != "1" ]; then
		fatal "Can't connect to $desthost as $destuser."
	fi
fi

##################################################################
### FUNCTIONS

function do_letters() {
	for i in a b c d e f g h i j k l m n o p q r s t u v w x y z; do
		do_maildirs "$srcdir/$i"
	done
}

function do_maildirs() {
	local dir=$1
	[ -d $dir ] || fatal "directory $dir not found."
	for userdir in `ls -1 $dir`; do
		do_userdir $userdir
	done
}

function do_user() {
	local user=$1
	local letter=${user:0:1}
	local dir="$srcdir/$letter/$user"
	[ -d $dir ] || fatal "maildir $dir not found".

	while 1; do
		load=`uptime | sed 's/^.*load average: \\([^,]*\\).*$/\\1/'`
		if [ $load -lt $loadlimit ]; then
			info "load $load, sleeping..."
			sleep 600
		else
			break
		fi
	done
	
  	cmd="rsync $maildirrsyncflags $excludes '$dir' '$destuser@$desthost:$destdir/maildir/$letter'"
  	debug $cmd
	# ret=`rsync $maildirrsyncflags $excludes '$dir' '$destuser@$desthost:$destdir/maildir/$letter' 2>&1`
}

# remove any maildirs from backup which might have been deleted
# and add new ones which have just been created.

function do_remove() {
	local tmp1=/tmp/maildirtmpfile$$
	local tmp2=/tmp/maildirtmpfile$$
	
	for i in a b c d e f g h i j k l m n o p q r s t u v w x y z; do
		ls -1 "$srcdir/$i" | sort > $tmp1
		ssh -p $destport $desthost 'ls -1 '$destdir/maildir/$i' | sort > $tmp2
		for deluser in `join -v 2 $tmp1 $tmp2`; do
			cmd="ssh -p $destport $desthost rm -vr '$destdir/maildir/$i/$deluser/'"
			debug $cmd
		done
	done
	rm $tmp1
	rm $tmp2	
}

###
##################################################################

### ROTATE BACKUPS ###

if [ "$remove" == "yes" ]; then

fi

### REMOVE OLD MAILDIRS ###

if [ "$rotate" == "yes" ]; then

fi

### ROTATE BACKUPS ###

if [ "$letter" != "" ]; then

fi

if [ "$user" != "" ]; then

fi