#! /bin/bash

set -e
set -u

statusfile=/home/cig/vmbackup.status
basedir=/mnt/backups/vms

_exit () {
	echo $1 > $statusfile
	exit $1
}

_mail () {
	echo "$@" | mail -s "$(hostname -f) : vm backup error" root
}

mount /mnt/backups &> /dev/null

if [ ! -d $basedir ] ; then
	_mail Dir $basedir not mounted
	_exit 41
fi

outputdir=${basedir}/$(date -I)

if [ $# -ne 1 ] ; then
	echo "Usage: $O vm"
	echo "Stop, backup and start given vm"
	_exit 42
fi

function checkRunning {
	local machine=$1
	vboxmanage list runningvms | grep -q $machine
	return $?
}

machine=$1
if ( checkRunning $machine ) ; then
	mkdir -p ${outputdir}
	cp -ar ${basedir}/current/. --target-directory=${outputdir}
	mv ${basedir}/current ${basedir}/old
	ln -s ${outputdir} ${basedir}/current
	test $? -eq 0 || { _mail "erreur de copie" ; _exit 44 ; }
	vboxmanage controlvm $machine acpipowerbutton shutdown
	sleep 60
	rsync --inplace -a /srv/VM/Win/roofline ${outputdir}/
	ret=$?
	test $ret -eq 0 || _mail "rsync error $ret"
	vboxmanage startvm $machine
	ln -s ${outputdir} ${basedir}/current
	test $ret -eq 0 && find ${basedir} -maxdepth 1 -type d -mtime +7 -exec echo rm -fr {} \;
	umount /mnt/backups &> /dev/null
	_exit $ret
fi
_mail "vm $machine not running"
_exit 43