#!/usr/bin/env bash 

set -eu

#set -x

synopsis() {
	cat << EOF
Usage : `basename $0` [-h] system
EOF
}

help() {
	cat << EOF

`basename $0` sauvegarde le système.

`synopsis`

-h	: affiche cette aide

EOF
}

usage() {
	synopsis
	exit 1
}

args() {
	local opt
	while getopts "h" opt; do
		case $opt in
			h) help; exit 0;;
			?) usage;;
		esac
	done
	shift $(($OPTIND - 1))
	[ $# -ne 1 ] && usage

	GUEST_NAME="$1"
	if echo $GUEST_NAME | grep -q '/'; then
		error "$GUEST_NAME est un nom de système invalide"
	fi
}

saveSystem() {

	o="$SAVE_FILE"
	n="$SAVE_FILE.tmp.tgz"
	d="$(dirname $n)"

	[ ! -d $d ] && mkdir -p $d

	set +e
	( umask 077 && vdn-ssh root@$GUEST_NAME "/etc/vdn/save" > $n )
	r=$?
	set -e

	if [ $r = 0 ]; then
		mv $n $o
		resizeMultipleOf512 $o
		r=$?
	fi

	return $r
}




# Programme principal

VDN_PATH=$(readlink -f $(dirname $0)/..); . $VDN_PATH/bin/functions.sh

args "$@"

loadGuestVars $GUEST_NAME

case $MODE in
	tgz|tgz2) ;;
	*|overlay) exit 0;;
esac

if [ ! -e $GUEST_PATH ]; then
	error "Le système $GUEST_NAME n'existe pas !"
fi

#vdn-ssh root@$GUEST_NAME echo > /dev/null || error "Can't connect to $GUEST_NAME"

cmd=saveSystem

if $cmd ; then
	s=$(du -h  $SAVE_FILE  | tr '\t' ' ' | cut -d ' ' -f 1)
	echo "Sauvegarde $SAVE_FILE effectuée ($s) !"
	exit 0
else
	echo "vdn-save ($GUEST_NAME) : Échec de la sauvegarde !" >&2
	exit 1
fi