#!/bin/sh
#
# backup handling

. /etc/init.d/rc.functions

action="$1"
name="$2"
backup_type="$3"
server="$BACKUP_SERVER"

clientdir="$(hostname)_$(ifconfig | grep HWaddr | awk '{print $5}')"

status=0

update_menu()
{
	path="$(readlink /data/backup | sed 's|/[^/]*/[^/]*/||')"
	dev="$(readlink /data/backup | cut -d / -f3)"
	id="$(blkid | grep /dev/$dev | sed 's/.*UUID="\([^"]*\).*/UUID=\1/')"
	cd /data/backup
	find /data/backup/ -maxdepth 1 ! -path /data/backup/ -printf "%TY-%Tm-%Td %f\n" | sort | while read date name; do
		echo "label $date $name"
		echo "	kernel /$path/$name/boot/kernel"
		echo "	append initrd=/$path/$name/boot/initramfs dev=$id vga=0x314 splash=silent quiet apm=off"
	done > /boot/isolinux/backup_menu.conf
}

case "$action" in
	l | list)
		{
		find /mnt/data/backup/ -maxdepth 1 ! -path /mnt/data/backup/ -printf "%TY-%Tm-%Td - %f\n" 2>/dev/null
		find /data/backup/ -maxdepth 1 ! -path /data/backup/ -printf "%TY-%Tm-%Td - %f (bootable)\n"
		find /media/Backup/$server/$clientdir/ -maxdepth 1 ! -path /media/Backup/$server/$clientdir/ -printf "%TY-%Tm-%Td - %f (server)\n"
		} | sort
		;;
        c | create)
		# Backup erstellen
		static=/etc/backup-exclude-static.list
		custom=/etc/backup-exclude-custom.list
		if [ -n "$name" ]; then
			if [ "$backup_type" = "bootable" -a -e "/data/backup/$name" -o "$backup_type" = "normal" -a -e "/mnt/data/backup/$name" -o "$backup_type" = "server" -a -e "/media/Backup/$server/$clientdir/$name" ]; then
				echo "Backup already exists: $name" >&2; status=1
			elif [ "$backup_type" = "bootable" ]; then
				if [ ! -e "/src/backup_workdir/bootable/lastbackup" ]; then
					mkdir -p "/data/backup/$name" || status=1
					mkdir -p "/src/backup_workdir/bootable" || status=1
					rsync -a --delete --exclude-from=$custom --exclude-from=$static /mnt/system/* "/data/backup/$name" || status=1
					ln -nsf "/data/backup/$name" "/src/backup_workdir/bootable/lastbackup" || status=1
					test $status = 1 && rm -r "/data/backup/$name" && rm -r "/src/backup_workdir/bootable/lastbackup"
					update_menu
				else
					mkdir -p "/data/backup/$name" || status=1
					rsync -a --delete --exclude-from=$custom --exclude-from=$static --link-dest="/src/backup_workdir/bootable/lastbackup/" /mnt/system/* "/data/backup/$name" || status=1
					ln -nsf "/data/backup/$name" "/src/backup_workdir/bootable/lastbackup" || status=1
					test $status = 1 && rm -r "/data/backup/$name" && rm -r "/src/backup_workdir/bootable/lastbackup"
					update_menu
				fi
			elif [ "$backup_type" = "server" ]; then
				if [ ! -e "/media/Backup/$server" ]; then
					echo "Server not available."
				elif [ ! -e "/src/backup_workdir/server/$server/$clientdir/lastbackup" ]; then
					mkdir -p "/media/Backup/$server/$clientdir/$name" || status=1
					mkdir -p "/src/backup_workdir/server/$server/$clientdir" || status=1
					rsync -a --delete --exclude-from=$custom --exclude-from=$static /mnt/system/* "/media/Backup/$server/$clientdir/$name" || status=1
					ln -nsf "/media/Backup/$server/$clientdir/$name" "/src/backup_workdir/server/$server/$clientdir/lastbackup" || status=1
					test $status = 1 && rm -r "/media/Backup/$server/$clientdir/$name" && rm -r "/src/backup_workdir/server/$server/$clientdir/lastbackup"
					update_menu
				else
					mkdir -p "/media/Backup/$server/$clientdir/$name" || status=1
					rsync -a --delete --exclude-from=$custom --exclude-from=$static --link-dest="/src/backup_workdir/server/$server/$clientdir/lastbackup/" /mnt/system/* "/media/Backup/$server/$clientdir/$name" || status=1
					ln -nsf "/media/Backup/$server/$clientdir/$name" "/src/backup_workdir/server/$server/$clientdir/lastbackup" || status=1
					test $status = 1 && rm -r "/media/Backup/$server/$clientdir/$name" && rm -r "/src/backup_workdir/server/$server/$clientdir/lastbackup"
					update_menu
				fi
			elif [ "$backup_type" = "normal" ]; then
				if [ ! -e "/src/backup_workdir/normal/lastbackup" ]; then
					mkdir -p "/mnt/data/backup/$name" || status=1
					mkdir -p "/src/backup_workdir/normal" || status=1
					rsync -a --delete --exclude-from=$custom --exclude-from=$static /mnt/system/* "/mnt/data/backup/$name" || status=1
					ln -nsf "/mnt/data/backup/$name" "/src/backup_workdir/normal/lastbackup" || status=1
					test $status = 1 && rm -r "/mnt/data/backup/$name" && rm -r "/src/backup_workdir/normal/lastbackup"
					update_menu
				else
					mkdir -p "/mnt/data/backup/$name" || status=1
					rsync -a --delete --exclude-from=$custom --exclude-from=$static --link-dest="/src/backup_workdir/normal/lastbackup/" /mnt/system/* "/mnt/data/backup/$name" || status=1
					ln -nsf "/mnt/data/backup/$name" "/src/backup_workdir/normal/lastbackup" || status=1
					test $status = 1 && rm -r "/mnt/data/backup/$name" && rm -r "/src/backup_workdir/normal/lastbackup"
					update_menu
				fi
			else
				echo "No Backup can be create. Please check your configs!"
			fi
		fi
		;;
	r | restore)
		# Backup zurückspielen
		name="${name%% (*)}"
		if [ -n "$name" ]; then
			if [ ! -e "/data/backup/$name" -a ! -e "/mnt/data/backup/$name" -a ! -e "/media/Backup/$server/$clientdir/$name" ]; then
				name="${name#* - }"
			fi
			if [ ! -e "/data/backup/$name" -a  ! -e "/mnt/data/backup/$name" -a ! -e "/media/Backup/$server/$clientdir/$name" ]; then
				echo "Backup not found: $name" >&2; status=1
			else
				path="$(readlink /mnt/system | sed 's|\(/[^/]*/[^/]*\)/.*|\1|')"
				old_dir="$(readlink $path/mld)"
				if [ -e /tmp/backup ]; then
					old_name="mld-mv"
				else
					old_name="mld-old"
					rm -rf $path/mld-old
					touch /tmp/backup
				fi
				if [ -e "/media/Backup/$server/$clientdir/$name" ]; then
					rsync -a "/media/Backup/$server/$clientdir/$name" $path/mld-new || status=1
				elif [ -e "/mnt/data/backup/$name" ]; then
					rsync -a "/mnt/data/backup/$name" $path/mld-new || status=1
				else
					rsync -a "/data/backup/$name" $path/mld-new || status=1
				fi
				if [ $status = 1 ]; then
					rm -r $path/mld-new
				else
					rm -r $path/mld-new/boot/isolinux || status=1
					mv $path/mld/boot/isolinux $path/mld-new/boot/isolinux || status=1
					ln -fsn mld-new $path/mld || status=1
					mv "$path/$old_dir" "$path/$old_name" || status=1
					ln -fsn "$old_name" $path/mld || status=1
					mv $path/mld-new $path/$old_dir || status=1
					ln -fsn $old_dir $path/mld || status=1
					rm -rf $path/mld-mv || status=1
				fi
			fi
		fi
		;;
	d | delete)
		# Backup löschen
		name="${name%% (*)}"
		if [ -n "$name" ]; then
			if [ ! -e "/data/backup/$name" -a ! -e "/mnt/data/backup/$name" ]; then
				name="${name#* - }"
			fi
			if [ -e "/media/Backup/$server/$clientdir/$name" ]; then
				rm -r "/media/Backup/$server/$clientdir/$name" || status=1
				update_menu
			elif [ -e "/mnt/data/backup/$name" ]; then
				rm -r "/mnt/data/backup/$name" || status=1
				update_menu
			elif [ -e "/data/backup/$name" ]; then
				rm -r "/data/backup/$name" || status=1
				update_menu
			else
				echo "Backup not found: $name" >&2; status=1
			fi
		fi
		;;
	u | update)
		update_menu
		;;
	*)
		echo "Usage: ${0##*/} {list | create | restore | delete | update} [BACKUP_NAME]"
		;;
esac

exit $status