#!/bin/sh

###########################################################
# This script uses rsync to backup directories on a media 
# (ex: USB disk) with a copy and incremental method. 
###########################################################
#     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 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, write to the Free Software
#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
############################################################
#
# Written by Spip <unpeudescience at gmail dot com>
# Version 1.0
#
############################################################

#to be nice...
ionice -c3 -p$$
renice +15 -p $$

THEDATE=`date +%F_%Hh%M`
FILE='/media/disk/sauvegarde'
LOGFILE='/var/log/sauvegarde'
SPLIT='====================================================================='

#check logfile directory
if ! [ -e $LOGFILE ]
then
	/bin/mkdir -p $LOGFILE
fi

#check if the media is mounted
if ! [ -e $FILE ]
then
	FILE='/media/disk-1/sauvegarde'
	if ! [ -e $FILE ]
	then
		echo "$THEDATE : péripherique non connecté. Pas de sauvegarde possible" >> "$LOGFILE/save.log"
		echo $SPLIT >> "$LOGFILE/save.log"
		exit 0
	fi
fi

#prevent a second task
LOCKFILE="/var/lock/sauvegarde.lock"
[ -f $LOCKFILE ] && exit 0
#if the script are stopped, remove lockfile
trap "rm -f $LOCKFILE" EXIT
touch $LOCKFILE

echo "$THEDATE : Début de sauvegarde" >> "$LOGFILE/save.log"

# $1:time to keep files; $2: name of the backup; $3: target; $4: exclusion
function save() {
	
	echo "$SPLIT" >> "$LOGFILE/$2.log"
	echo "$THEDATE" >> "$LOGFILE/$2.log"

	#Incremental & copie
	INC="$FILE/$2/INC/$THEDATE"
	BAK="$FILE/$2/BAK"
	TOSAVE="$3"
	
	/bin/mkdir -p "$INC"
	if ! [ -e "$BAK" ]
	then
	/bin/mkdir -p "$BAK"
	fi
#Mr Proper with tmpwatch: 3d indicates 3 days, time before cleaning 
	if [ `ls $FILE/$2/INC | wc -l` -gt 6 ]
	then
	/usr/sbin/tmpwatch -a $1 "$FILE/$2/INC" >> "$LOGFILE/save.log"
	fi

#a: archivage :recurcif, preserve dates, persmissions, groupes...
#v: verbose mode
#delete : supprime les fichiers n'etant plus chez l'émeteur >> copie conforme.

	/usr/bin/rsync -av --stats --delete-excluded --backup --backup-dir="$INC" "$TOSAVE" "$BAK" --exclude=$4 >> "$LOGFILE/$2.log"
#bz2 compression & remove files	
	cd $FILE/$2/INC
	tar -cjvf "$INC.tar.bz2" "$THEDATE"
	rm -rf "$THEDATE"

}

#List here all repositories to backup

save 5d thunderbird_gnu /home/gnu/.thunderbird/
save 4d firefox_gnu /home/gnu/.mozilla/ /home/gnu/.mozilla/firefox/soue3i2s.default/Cache/

save 20d source_code /home/gnu/Bureau/source_code/
save 20d rpm /home/package/rpm

save 120d irssi /home/gnu/.irssi
save 120d screen /home/gnu/.screenrc
save 120d conky /home/gnu/.conkyrc
#save 120d granu /home/gnu/Bureau/granu
save 120d granu_project /home/gnu/Bureau/granu/projet

#to log the end of the backup
THEDATE=`date +%F_%Hh%M`
echo "$THEDATE : Sauvegarde effectuée" >> "$LOGFILE/save.log"


exit 0