#!/bin/sh
#
# backup-servers
# John Simpson <jms1@jms1.net> 2005-09-12
#
# Documentation: http://www.jms1.net/docs/rsync-backup.shtml
#
###############################################################################
#
# Copyright (C) 2005,2006,2007,2008 John Simpson.
#
# 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 2 or version 3 of the
# license, at your option.
#
# 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/>.
#
###############################################################################

PATH="/usr/bin:/bin"

##############################################################################
#
# configuration

BACKUPDIR="/backup"

LOGFILE="$BACKUPDIR/backup.log"			# in addition to syslog
SERVERS="server1.domain.abc server2.domain.xyz"	# servers to be backed up
KEY="/root/.ssh/id_dsa_backup"			# ssh key file

EXCLUDES="/dev /proc /sys /tmp /var/tmp"
EXCLUDES="$EXCLUDES /var/lib/pgsql/data /var/lib/mysql"
EXCLUDES="$EXCLUDES /var/qmail/queue /var/qmail/simscan"

# make sure cron's output gets mailed to the right place
MAILTO="postmaster@domain.xyz"
export MAILTO

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

function log() {
	logger -t backup -p local5.info "$@"

	if [ -n "${LOGFILE:-}" ]
	then
		echo `date` "$@" >> $LOGFILE
	fi
}

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

# make rsync use ssh with the correct key
RSYNC_RSH="/usr/bin/ssh -i $KEY"
export RSYNC_RSH

# make sure agent keys don't override the backup key
unset SSH_AUTH_SOCK

########################################
# if we were called with "-v", pass the "-v" along to rsync

if [ "$1" == "-v" ]
then
	OPTV="-v"
else
	OPTV=""
fi

########################################
# build list of excludes

EXC=""
for e in $EXCLUDES
do
	EXC="$EXC --exclude=$e"
done

########################################
# let's do it

log '/===================='
log "backup-server $OPTV starting"

for SERVER in $SERVERS
do
	########################################
	# make sure target directory exists

	TARGET="$BACKUPDIR/$SERVER"

	if [ ! -d $TARGET ]
	then
		mkdir -p -m 0755 $TARGET
	fi

	########################################
	# make sure an earlier backup isn't already running

	if egrep -q "^rsync.*${TARGET}" /proc/*/cmdline > /dev/null 2>&1
	then
		log "$SERVER already in progress"
		continue
	fi

	########################################
	# do the deed

	log "$SERVER starting"

	rsync -aS $OPTV --delete $EXC --bwlimit=1024 $SERVER:/ ${TARGET}/

	rv=$?
	log "$SERVER done rv=$rv"

done

log "backup complete"
log '\===================='