#!/bin/sh
# Build one or more .subx files into an ELF binary, and package it up into a
# bootable ISO image with a Soso (https://github.com/ozkl/soso) kernel.
#
# Must be run on Linux, and from the top-level mu/ directory. Will ask for
# `sudo` privileges at a couple of points.
#
# Soso is published under the 2-clause BSD license.

set -e

if [ $# -ne 1 ]
then
  echo "Usage: `basename $0` <elf file>"
  exit 1
fi

echo "=== constructing initramfs out of SubX binary"
dd if=/dev/zero of=initrd.fat bs=8M count=1
LOOP=`losetup -f`
sudo losetup $LOOP initrd.fat
sudo mkfs.vfat $LOOP
sudo mount $LOOP /mnt
sudo cp $1 /mnt/init
sudo umount /mnt
sudo losetup -d $LOOP
sync
chown $SUDO_USER:$SUDO_USER initrd.fat

echo "=== building soso kernel"
( cd tools/iso/kernel.soso
  make
)

echo "=== generating mu_soso.iso"
mkdir -p outfs/boot/grub
cp tools/iso/kernel.soso/grub.cfg outfs/boot/grub
cp tools/iso/kernel.soso/kernel.bin outfs/boot/
cp initrd.fat outfs/boot/
grub-mkrescue -o mu_soso.iso outfs