#!/bin/sh
# $Id: dw-backup.sh 328 2004-12-22 13:15:20Z dp $

# config 
WIKIPATH="/home/dp/www/dokuwiki" # path to your wiki, no symbolic links are allowed!
# for debian etch: /var/lib/dokuwiki

BACKUPPATH="/home/dp/dw-backup" # where do you save the backups?
DAILY_DATA_BACKUPS="8" # keep this amount data backups
DAILY_MEDIA_BACKUPS="3" # and media backups
# no more config

# creates $1, if not existant
checkDir()
{
	if [ ! -d "${BACKUPPATH}/$1" ]
	then
		mkdir -p "${BACKUPPATH}/$1"
	fi
}

# 1 -> path
# 2 -> name
# 3 -> number of backups
rotateDir()
{
	for i in `seq $(($3 - 1)) -1 1`
	do
		if [ -f "$1/$2.$i.tar.bz2" ]
		then
			mv "$1/$2.$i.tar.bz2" "$1/$2.$((i + 1)).tar.bz2"
		fi
	done
}


# make sure everything exists
checkDir "data"
checkDir "data/archive"
checkDir "data/daily"

checkDir "media"
checkDir "media/archive"
checkDir "media/daily"

# first step: rotate daily.
rotateDir "${BACKUPPATH}/data/daily" "data" "$DAILY_DATA_BACKUPS"
rotateDir "${BACKUPPATH}/media/daily" "media" "$DAILY_MEDIA_BACKUPS"

# then create our backup
#   --exclude is not accepted for Linksys NSLU2 box, any alternative?
tar --exclude=".*" -cjf "/tmp/data.1.tar.bz2" -C "${WIKIPATH}" "data"
tar --exclude=".*" -cjf "/tmp/media.1.tar.bz2" -C "${WIKIPATH}" "media"

# for debian etch, replace "media" by "data/media" in line above
# and add --exclude="media" to first tar line


# create an archive backup?
if [ `date +%d` = "01" ]
then
	cp "/tmp/data.1.tar.bz2" "${BACKUPPATH}/data/archive/data-"`date +%m-%d-%Y`".tar.bz2"
	cp "/tmp/media.1.tar.bz2" "${BACKUPPATH}/media/archive/media-"`date +%m-%d-%Y`".tar.bz2"
fi

# add them to daily.
mv "/tmp/data.1.tar.bz2" "${BACKUPPATH}/data/daily"
mv "/tmp/media.1.tar.bz2" "${BACKUPPATH}/media/daily"