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#!/bin/sh
# Build one or more .subx files into an ELF binary, and package it up into a
# bootable ISO image with a Linux kernel.
#
# Must be run on Linux, and from the top-level mu/ directory.
#
# Dependencies:
# apt install build-essential flex bison wget libelf-dev libssl-dev xorriso
#
# Based on http://minimal.linux-bg.org (GPLv3)
set -e
if [ $# -eq 0 ]
then
echo "Usage: `basename $0` file.subx ..."
exit 1
fi
echo "=== building SubX binary"
./translate_subx $*
mv a.elf init
echo "=== constructing initramfs out of SubX binary"
rm -rf tmp_linux/isoimage
mkdir -p tmp_linux/isoimage/boot
echo init | cpio -R root:root -H newc -o | xz -9 --check=none > tmp_linux/isoimage/boot/rootfs.xz
if [ ! -d kernel.linux ]
then
echo "=== cloning linux kernel"
git clone https://github.com/akkartik/kernel kernel.linux
fi
echo "=== building linux kernel"
( cd kernel.linux
make bzImage -j $(grep ^processor /proc/cpuinfo | wc -l)
)
cp *.linux/arch/x86/boot/bzImage tmp_linux/isoimage/boot/kernel.xz
echo "=== downloading syslinux"
test -f tmp_linux/syslinux-6.03.tar.xz || wget https://kernel.org/pub/linux/utils/boot/syslinux/syslinux-6.03.tar.xz -P tmp_linux
echo "=== unpacking syslinux"
tar xf tmp_linux/syslinux-*.tar.xz -C tmp_linux
mkdir -p tmp_linux/isoimage/boot/syslinux
cp tools/iso/syslinux.cfg \
tmp_linux/syslinux-*/bios/core/isolinux.bin \
tmp_linux/syslinux-*/bios/com32/elflink/ldlinux/ldlinux.c32 \
tmp_linux/isoimage/boot/syslinux
echo "=== generating mu_linux.iso"
# 'hybrid' ISO can also be used on non-optical media such as a disk or USB stick
xorriso -as mkisofs \
-isohybrid-mbr tmp_linux/syslinux-*/bios/mbr/isohdpfx.bin \
-c boot/syslinux/boot.cat \
-b boot/syslinux/isolinux.bin \
-no-emul-boot \
-boot-load-size 4 \
-boot-info-table \
tmp_linux/isoimage -o mu_linux.iso
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