#!/bin/bash
#
# need utils smbfs

declare -a DIR2CIFS=""	# répertoire local vers lequel sera monté le partage réseau
declare -a RSYNC_OPTIONS="-acRz --delete-during --delete-excluded --ignore-errors --force --numeric-ids --partial --stats --timeout=900"
declare -a DIR2BCKP="()"	# ne pas modifier !

DIR2BCKP[0]="/etc/"
DIR2BCKP[1]="/home/"
DIR2BCKP[2]="/root/"

declare -i NB_ARCHIVES=7

# ------------- system commands used by this script --------------------

declare -i count=${#DIR2BCKP[@]}
declare -i i=0
declare -i x=$(expr $NB_ARCHIVES - 1)

if (( `id -u` != 0 )); then { $ECHO "Sorry, must be root.  Exiting..."; exit; } fi

mount "$DIR2CIFS/"

# step 1: delete the oldest snapshot, if it exists:
if [ -d "$DIR2CIFS/daily.$NB_ARCHIVES" ] ; then
	rm -rf "$DIR2CIFS/daily.$NB_ARCHIVES" ;
fi ;

# step 2: shift the middle snapshots(s) back by one, if they exist
while [ "$x" -gt 0 ]; do
	if [ -d "$DIR2CIFS/daily.$x" ]; then
		y=$(expr $x + 1)
		mv "$DIR2CIFS/daily.$x" "$DIR2CIFS/daily.$y"
	fi
	x=$(($x-1))
done

#step 3: daily.0 -> daily.1
if [ -d "$DIR2CIFS/daily.0" ]; then
	cp -al "$DIR2CIFS/daily.0" "$DIR2CIFS/daily.1"
fi

#step 4: if not exists daily.0
[ -d "$DIR2CIFS/daily.0" ] && mkdir "$DIR2CIFS/daily.0"

#step 5: rsync
cd $DIR2CIFS
while [ "$i" -lt "$count" ]; do
	rsync $RSYNC_OPTIONS "${DIR2BCKP[$i]}" "$DIR2CIFS/daily.0"
	i=$(($i+1))
done

#step 6: uptime mtime
touch "$DIR2CIFS/daily.0"

umount "$DIR2CIFS/"