#!/bin/sh

disc1=`ls | grep "disc1.iso"`
disc2=`ls | grep "disc2.iso"`
disc3=`ls | grep "disc3.iso"`

dvd=`echo $disc1 | sed "s/disc1/dvd/"`

## Prepare temporary dir to store dvd files
if test -e tmp && test -d tmp
then
    rm -fr tmp
fi
mkdir tmp

## Extract contents of each disc*.iso to temporary dir
for disc in $disc3 $disc2 $disc1
do
    mdconfig -a -f $disc -u 66
    if test -e /dev/md66
    then
    echo Extract $disc ...
    mount -t cd9660 /dev/md66 /mnt
    tar -cf - -C /mnt . | tar -xf - -C tmp/
    umount /mnt
    mdconfig -d -u 66
    else
    echo Can not create memory disk.
    exit -1
    fi
done

## Merge index to point to the first disc
echo Merge index ...
cd tmp
cat INDEX | sed "s/||2/||1/g" > index
cat index | sed "s/||3/||1/g" > INDEX
cat INDEX | sed "s/|3/|1/g" > index
mv index INDEX
cd ..

## Make dvd iso file
echo Make $dvd ...
mkisofs -R -no-emul-boot -b boot/cdboot -o $dvd tmp
rm -fr tmp

exit 0