#!/bin/bash
#
# $Id: modified-iso-build,v 1.3 2008/05/17 07:00:42 suter Exp $
# Copyright (C) 2003 Mark Suter <mark.suter@miju.com.au>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

## Where the data comes and goes
home=/shared/standard-build/
source=bbc-2.1.iso
build=ebbe
dest=modified.iso
script_hd=modified-iso-install
script_md=modified-iso-install-raid

## Our "die" function (think perl)
function die () { echo "$@" 1>&2 ; exit 1 ; }

## Set our PATH and test for needed binaries
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
hash test id md5sum mktemp mount find bzip2 cpio cp mkisofs umount rmdir rm || die $0: required binaries not present

## We need the power!
test "$( id -u )" == "0" || die $0: Please run this script as root

## Go to the right place
cd $home || die $0: Cannot chdir to \$home $home directory

## Check the source
md5sum -v -c $source.md5 || die $0: base iso image is corrupt

## Make a read-write copy of the iso's contents
ro_mount=$( mktemp -d ) || die $0: failed to create ro area
rw_copy=$( mktemp -d ) || die $0: failed to create rw area
mount -o loop $source $ro_mount
( cd $ro_mount ; find . -print0 | cpio --null --make-directories --preserve-modification-time --pass-through $rw_copy )
umount $ro_mount
rmdir $ro_mount

## Add the "$build" system
( cd $build ; find . -print0 | cpio --null --format=crc --create | bzip2 --best --stdout --compress > $rw_copy/$build )
cp $script_hd $rw_copy/install.sh
cp $script_md $rw_copy/raid-install.sh

## Generate a modified iso image
mkisofs -c boot.catalog -b lnx.img \
    -A "GNU/Linux" -V "LNX-BBC" --publisher "www.lnx-bbc.org" \
    -d -D -N -r -T \
    -o $dest \
    $rw_copy

## Clean up
rm -rf $rw_copy