#!/bin/bash
# Script for individual Backups with rsync and hardlinks
# Copyright (C) 2011  Marcel Jäpel (Firewire2002)
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

##################################################################################################################### Config

SSH_HOST="10.0.0.1"
SSH_PORT=22
SSH_PATH=/backup

BACKUP_PREFIX=My_Hostname
BACKUP_SOURCE=/
BACKUP_COUNTS=7
BACKUP_PARAMETER="-az --stats --delete-before --delete-excluded --partial --devices --specials --numeric-ids --hard-links --bwlimit=1024"
BACKUP_EXCLUDE="--exclude /backup/ \
		--exclude /mnt/backup/ \
		--exclude /proc/ \
		--exclude /sys/ \
		--exclude /var/lib/vz/root/ \
		--exclude /var/lib/vz/template/"

##################################################################################################################### Self			

PID=$$
SCRIPTNAME=$(basename $0)

##################################################################################################################### Search for last backup

logger -p info -t ${SCRIPTNAME}[${PID}] Getting Last Backup ...

DATE=$(date +%Y%m%d_%H%M%S)
LAST_BACKUP=$(ssh -p ${SSH_PORT} ${SSH_HOST} "/bin/ls -1 ${SSH_PATH} 2>/dev/null | tail -n1")

if [ "${LAST_BACKUP}" != "" ]; then
	LAST_BACKUP="--link-dest=${SSH_PATH}/${LAST_BACKUP}"	
fi

##################################################################################################################### Backup job

logger -p info -t ${SCRIPTNAME}[${PID}] Starting Backup ...

rsync ${BACKUP_PARAMETER} ${BACKUP_EXCLUDE} -e "ssh -p ${SSH_PORT}" $LAST_BACKUP ${BACKUP_SOURCE} ${SSH_HOST}:${SSH_PATH}/${BACKUP_PREFIX}_${DATE} 2>&1 | grep -v "file has vanished: " | while read LINE; do 
	if [ "x$LINE" != "x" ]; then 
		logger -p info -t ${SCRIPTNAME}[${PID}] ${LINE}
	fi
done

##################################################################################################################### Delete old backups

logger -p info -t ${SCRIPTNAME}[${PID}] Removing old Backups ...

COUNTER=0
for DIR in $(ssh -p ${SSH_PORT} ${SSH_HOST} "/bin/ls -1 -r ${SSH_PATH}/ | grep ${BACKUP_PREFIX}")
do
	let counter=$counter+1
	if [ $counter -gt "${BACKUP_COUNTS}" ]; then
		ssh -p ${SSH_PORT} ${SSH_HOST} "rm -rf ${SSH_PATH}/${DIR}"
	fi
done

##################################################################################################################### Finish

exit 0