#!/bin/bash
#
# Generate a isolinux/bios and efi ISO boot image

set -e
PATH=/usr/bin:/bin:/usr/sbin:/sbin

OUT=$1
BIOS=$2
EFI=$3

dir=$(mktemp -d $(dirname $OUT)/iso.dir.XXXXXX)
cfg=${dir}/isolinux.cfg

b=$(basename ${BIOS})
g=${b%.lkrn}
g=${g//[^a-z0-9]}
g=${g:0:8}.krn
# generate the config
cat > ${cfg} <<EOF
# These default options can be changed in the geniso script
SAY iPXE ISO boot image
TIMEOUT 0
DEFAULT ${b}
LABEL ${b}
 KERNEL ${g}
EOF
cp ${BIOS} ${dir}/${g}

# copy isolinux bootloader
cp /usr/lib/ISOLINUX/isolinux.bin ${dir}
cp /usr/lib/syslinux/modules/bios/ldlinux.c32 ${dir}

# generate EFI boot image
blocks=$((($(stat -c %s "$EFI") / 1024 + 55) / 32 * 32 ))
mkfs.msdos -C ${dir}/efi.img $blocks >/dev/null
mmd -i ${dir}/efi.img ::efi
mmd -i ${dir}/efi.img ::efi/boot
mcopy -o -i ${dir}/efi.img "$EFI" "::efi/boot/bootx64.efi"

# generate the iso image
xorriso -as mkisofs \
	-r -J -preparer "iPXE build system" \
	-appid "iPXE ${VERSION} - Open Source Network Boot Firmware" \
	-publisher "http://ipxe.org/" \
	-b isolinux.bin -c boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table \
	-eltorito-alt-boot --efi-boot efi.img -no-emul-boot \
	-output ${OUT} ${dir}

isohybrid ${OUT}

# clean up temporary dir
rm -fr ${dir}