#!/bin/bash

# create-iso

# To build a bootable (isolinux) CD from a larch USB-stick with
# syslinux or grub boot. This creates the ISO-file.

# $1 is the USB-stick's mount-point (default = /.livesys/medium).

# Author: Michael Towers (larch42 at googlemail dot com)
#
# This file is part of the larch project.
#
#    larch 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.
#
#    larch 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 larch; if not, write to the Free Software Foundation, Inc.,
#    51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
#----------------------------------------------------------------------------
# 2009.09.15

# You might need to adjust this
ISOLINUXBIN=/usr/lib/syslinux/isolinux.bin

#=================================================

APP="$( basename $0 )"
# Get path to this script
FULLPATH="$( readlink -f $0 )"
SCRIPTDIR="$( dirname ${FULLPATH} )"

# Default: the currently running system is a larch live system
MP="/.livesys/medium"

echo
echo "   ${APP} [larch system mount-point]"
echo
echo "Build an isolinux CD image (larch.iso) from the larch (syslinux only)"
echo "system mounted at the given mount point. The default mount-point is"
echo "${MP}, so that this script can be run easily from a running"
echo "larch system."
echo
echo "The image, and the temporary working files will be created in"
echo "the current directory. A LOT of space will be needed - about twice"
echo "the size of the CD image, so make sure this space is available"
echo "before running this program."
echo

if [ -n "$1" ]; then
    MP="$( readlink -f $1 )"
fi
if ! [ -d ${MP}/syslinux ]; then
    echo "ERROR: ${MP} is not a larch syslinux system" 1>&2
    exit 1
fi

# test if the script is started by root user. If not, exit
if [ $UID -ne 0 ]; then
    echo "Only root can run this program"; exit 1
fi

read -p "  Continue? [y|N]: " ans
if [ -z "$( echo ${ans} | grep '^ *[yY]' )" ]; then exit 0; fi

mkiso ()
{
    mkisofs -r -l $1 \
        -no-emul-boot -boot-load-size 4 -boot-info-table \
        -input-charset=UTF-8 \
        -publisher "designed by gradgrind, licence: GPL" \
        -A "larch-7" \
        -o "larch.iso" "${CDDATA}"

    if [ $? -eq 0 ]; then
        echo "// Your ISO has been created as larch.iso"
    else
        echo "ERROR: iso build failed" 1>&2
        return 1
    fi
}


if ! [ -f ${ISOLINUXBIN} ]; then
    echo "ERROR: Couldn't find isolinux.bin"
    exit 1
fi

CDDATA=$( pwd )/bootcd
rm -rf ${CDDATA}
mkdir -p ${CDDATA}/larch
if [ -d ${MP}/syslinux ]; then
    cp -r ${MP}/syslinux ${CDDATA}/isolinux
    mv ${CDDATA}/isolinux/syslinux.cfg ${CDDATA}/isolinux/isolinux.cfg
    isoarg="-b isolinux/isolinux.bin -c isolinux/isolinux.boot"
    cp ${ISOLINUXBIN} ${CDDATA}/isolinux
    # CDs are only bootable using the search method
    sed "s|\(initrd=larch.img .*\) uuid=[^ ]*|\1|g" -i ${CDDATA}/isolinux/isolinux.cfg
    sed "s|\(initrd=larch.img .*\) label=[^ ]*|\1|g" -i ${CDDATA}/isolinux/isolinux.cfg
    sed "s|\(initrd=larch.img .*\) root=[^ ]*|\1|g" -i ${CDDATA}/isolinux/isolinux.cfg
elif [ -d ${MP}/boot ]; then
    cp -r ${MP}/boot ${CDDATA}
    isoarg="-b boot/grub/stage2_eltorito"
    # CDs are only bootable using the search method
    sed "s|\(larch.kernel .*\) uuid=[^ ]*|\1|g" -i ${CDDATA}/boot/grub/menu.lst
    sed "s|\(larch.kernel .*\) label=[^ ]*|\1|g" -i ${CDDATA}/boot/grub/menu.lst
    sed "s|\(larch.kernel .*\) root=[^ ]*|\1|g" -i ${CDDATA}/boot/grub/menu.lst
else
    echo "ERROR: No syslinux or boot directory"
    exit 1
fi

for f in $( ls ${MP}/larch | grep -v "\.sqf" ); do
    cp -r ${f} ${CDDATA}/larch
done
cp ${CDDATA}/larch/system.sqf ${CDDATA}/larch
# Use the updated overlay(s) ('_' suffix) if they are present.
for f in mods filter; do
    if [ -f ${MP}/larch/${f}.sqf_ ]; then
        cp ${MP}/larch/${f}.sqf_ ${CDDATA}/larch/${f}.sqf
    else
        cp ${MP}/larch/${f}.sqf ${CDDATA}/larch
    fi
fi
done

# Session saving stuff is irrelevant on a CD
rm -f ${CDDATA}/larch/save

mkiso "${isoarg}"