#!/bin/bash
# This script dumps the specified Filesystem via dump on a CD/DVD
# CD_CAPACITY defines the capacity in MB per CD
# The script for the next volume is passed via the -F option of dump
# At least for my DVD-Recorder (a PHILIPS DVR-A03) it is necessary
# to define the tracksize for the next track before the DVD is written.
# This is done via the -tsize option of cdrecord. Since tsize takes its
# arguments in Bytes, the shell cannot compute the value correctly
# anymore (value too high), so I use bc.

# !!! If you plan to write DVD's with other sizes, please correct the
# CD_CAPACITY in the dump_userexit_DVD script, too !!!

COMPRESSION_LEVEL=2
RECORD_BIN="/usr/bin/dvdrecord dev=0,0,0 fs=64M speed=2 "
EXITSCRIPT="/root/bin/dvd_dump_userexit"
FILESYSTEM="/home"
LEVEL=0
LABEL="`date -I`"
CD_CAPACITY=4300
TSIZE="$(echo "$CD_CAPACITY*1024*1024" | bc -l )"
BSIZE="$(echo "$CD_CAPACITY*1024" | bc -l )"
FIFO="/tmp/dump.fifo"
DUMP_BIN="/usr/sbin/dump -z$COMPRESSION_LEVEL -b64 -B$BSIZE -F $EXITSCRIPT -$LEVEL -L $LABEL -f $FIFO $FILESYSTEM"

rm -f $FIFO
mkfifo $FIFO
ANSWER=""
while [ "$ANSWER" != "y" ] ; do  
	read -p "Did you insert DVD No. 1? (y/n)" ANSWER
	if [ "$ANSWER" == "y" ] ; then
		$RECORD_BIN -blank=fast
		$RECORD_BIN -eject -dao -pad -tsize=$TSIZE -data $FIFO &
		$DUMP_BIN 
		rm -f $FIFO
		exit 0
	elif [ "$ANSWER" == "n" ] ; then
		EXIT=""
		read -p "Do you really want to exit? (y/n)" EXIT
		if [ "$EXIT" == "y" ] ; then
			exit 1
		fi
	fi
done