#!/bin/sh

set -e

mkdir -p /tmp/iso
cd /tmp/iso

# input is a tarball of vmlinuz64 and initrd.img on stdin
# output is an iso on stdout

# extract. BSD tar auto recognises compression, unlike GNU tar
# only if stdin is a tty, if so need files volume mounted...
[ -t 0 ] || bsdtar xzf -

INITRD="$(find . -name '*.img')"
KERNEL="$(find . -name vmlinuz64 -or -name bzImage)"
CMDLINE="$*"

[ "$KERNEL" = "vmlinuz64" ] || mv "$KERNEL" vmlinuz64
[ "$INITRD" = "initrd.img" ] || mv "$INITRD" initrd.img

# clean up subdirectories
find . -mindepth 1 -maxdepth 1 -type d | xargs rm -rf

mkdir -p isolinux
cp /usr/share/syslinux/isolinux.bin ./isolinux/
cp /usr/share/syslinux/ldlinux.c32 ./isolinux/

CFG="DEFAULT linux
LABEL linux
    KERNEL /vmlinuz64
    INITRD /initrd.img
    APPEND ${CMDLINE}
"

printf "$CFG" > isolinux/isolinux.cfg

genisoimage -o ../mobylinux-bios.iso -l -J -R \
                -c isolinux/boot.cat  \
                -b isolinux/isolinux.bin \
                   -no-emul-boot -boot-load-size 4 -boot-info-table \
                -V MobyLinux .

isohybrid ../mobylinux-bios.iso

cat ../mobylinux-bios.iso