#!/bin/sh

BACKUPDIR=/root/backup
OPWD=$PWD

# print to stderr and die
fatal() {
	echo "Error: $@" 1>&2
	exit 1
}

cd $BACKUPDIR
DIRS=`find backup.* -type d -name 'backup.*' -maxdepth 0 2> /dev/null| sort -rn -t '.' -k 2`
if [ "$DIRS" != 'backup.*' ]; then
	echo "Moving older backups"
	for i in $DIRS; do
		[ ! -d "$i" ] && fatal "$i is not a directory."
		DEST=${i%%.*}.$((${i##*.} + 1))
		echo "$i -> $DEST"
		mv $i $DEST
	done
fi

# Only keep 20 backups (0-19)? 
rm -rf backup.20

# Create a new backup.0
mkdir backup.0
find /etc /usr/local/etc > /tmp/backup.list
rsync -a --delete --link-dest=../backup.1 --files-from=/tmp/backup.list / backup.0