#!/bin/bash

[ $# != 2 ] && echo missing parameters && exit 1

out=tmp/cd
grubcfg=$out/boot/grub/grub.cfg

preseed_path=${PRESEED_PATH-file=/cdrom/preseed.cfg}

mkdir $out

vmlinuzpath=$(xorriso -dev $1 -sh_style_result on -find / -type f -name vmlinuz 2>/dev/null | cut -f2- -d '/' | tail -1)
grubcfgpath=$(xorriso -dev $1 -sh_style_result on -find / -type f -name grub.cfg 2>/dev/null | cut -f2- -d '/' | tail -1)

if [ "$vmlinuzpath" != "" ]; then
   # Debian, newer Ubuntu, Fedora
   kpath=/`dirname $vmlinuzpath`
   kname=vmlinuz
else
   # Ubuntu
   kpath=""
   kname=linux
fi

if [ "$kpath" = "/images/pxeboot" ]; then
   # Fedora
   preseed="kickstart"
else
   # Debian
   preseed="preseed"
fi

xorriso -dev $1						\
	-sh_style_result on				\
	-osirrox on					\
	-extract_single $grubcfgpath $grubcfg

chmod u+w $grubcfg
cat <<EOF >>$grubcfg
menuentry 'Install preseeded' --id preseed {
    set background_color=black
    linux    $kpath/$kname auto=true priority=critical $preseed_path --- quiet
    initrd   $kpath/initrd.gz
}

menuentry 'Install kickstart' --id kickstart {
	linux $kpath/$kname inst.stage2=hd:/dev/sr0 ks=cdrom:/ks.cfg ro
	initrd $kpath/initrd.img
}

default=$preseed
timeout=5
EOF

xorriso -indev $1				\
	-outdev $2				\
	-map $grubcfg $grubcfgpath		\
	-map preseed.cfg /preseed.cfg		\
	-map anaconda-ks.cfg /ks.cfg		\
	-boot_image any replay

chmod -R a+rw $out
rm -rf $out