#!/bin/bash
#
# WizBackup Driver 1.1
# Copyright 2011 Bernie Innocenti <bernie@codewiz.org>
#
#  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 (at your option) 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/>.
#

if [ $# -lt 2 ]
then
	echo "Usage: $0 [MACHINE-TAB] [DEST]"
	echo
	echo "The MACHINE-TAB file contains hostnames of machines to be backed up, one per line."
	echo "Empty lines and lines starting with '#' are ignored."
	exit 1
fi

HOSTS=`cat $1 | egrep -v '^#|^ *$'`
DEST="$2"

LOGGROUP=`basename $1`
LOGDIR=/var/log/wizbackup
LOCKDIR=/var/lock/wizbackup
EXCLUDES_DIR="$DEST/EXCLUDE"

today=`date +"%Y%m%d"`
mkdir -p $LOGDIR
mkdir -p $LOCKDIR

if [ "`tty`" = "not a tty" ]; then
	LOGFILE="$LOGDIR/$LOGGROUP-$today.log"
else
	LOGFILE=/dev/stdout
fi

for host in $HOSTS; do
	opts=""
	for file in "$EXCLUDES_DIR/ALWAYS" "$EXCLUDES_DIR/$host"; do
		[ -f $file ] && opts="$opts --exclude-from $file"
	done

	start_time=$(date +%s)
	flock -n $LOCKDIR/$host nice ionice -c2 -n6 \
		wizbackup "$host:/" "$DEST/$host/" $opts >>$LOGFILE 2>&1
	result=$?
	end_time=$(date +%s)

	report="$(date +%s):$host:$(($end_time-$start_time)):$result"
	echo $report >>$LOGDIR/$LOGGROUP-report-$today.log
	[ $result != 0 ] && echo "$report" >>$LOGDIR/$LOGGROUP-fail-$today.log
done

# TODO: send fail log email report
# TODO: delete logs older than 45 days