#! /bin/sh

YEARTHISWEEK=`date +%Y-w%V`
YEARLASTWEEK=`date -d '1 week ago' +%Y-w%V`
DAY=`date +%w | sed 's/0/7/'`

LABDIR=/tmp/afeweb.$YEARTHISWEEK-$DAY
if [ $DAY -eq 1 ]; then
	OLDTAR=$HOME/backups/afeweb-$YEARLASTWEEK.tar.gz
	NEWTAR=$HOME/backups/afeweb-$YEARTHISWEEK.tar.gz
else
	OLDTAR=$HOME/backups/afeweb-$YEARTHISWEEK.tar.gz
	unset NEWTAR
fi
DIFFGZ=$HOME/backups/afeweb-$YEARTHISWEEK-$DAY.diff.gz
TOPDIR=tolhoneth
SOURCEPARENT=/var/www
SOURCEDIR=tolhoneth

if [ -f $OLDTAR ]; then
	# Extract old tarball and set up diffing environment
	mkdir $LABDIR
	cd $LABDIR
	tar xzf $OLDTAR
	mv $TOPDIR $TOPDIR.orig
	ln -s $SOURCEPARENT/$SOURCEDIR $TOPDIR

	# Do the diff and clean up
	diff -Naru $TOPDIR.orig $TOPDIR | gzip > $DIFFGZ
	cd -
	rm -rf $LABDIR
fi

if [ "$NEWTAR" ]; then
	# First day of the week, so build a new tarball
	cd $SOURCEPARENT
	tar czf $NEWTAR $SOURCEDIR
	cd -
fi