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#!/bin/bash

set -e -u

iso_name=parabola
iso_label="PARABOLA_$(date +%Y%m)"
iso_version=$(date +%Y.%m.%d)
install_dir=parabola
arch=$(uname -m)
work_dir=work
out_dir=out

script_path=$(readlink -f ${0%/*})

# Helper function to run make_*() only one time per architecture.
run_once() {
    if [[ ! -e ${work_dir}/build.${1}_${arch} ]]; then
        $1
        touch ${work_dir}/build.${1}_${arch}
    fi
}

# Base installation (root-image)
make_basefs() {
    mkparabolaiso -v -w "${work_dir}" -D "${install_dir}" init
}

# Copy mkinitcpio parabolaiso hooks and build initramfs (root-image)
make_setup_mkinitcpio() {
    cp /usr/lib/initcpio/hooks/parabolaiso ${work_dir}/root-image/usr/lib/initcpio/hooks
    cp /usr/lib/initcpio/install/parabolaiso ${work_dir}/root-image/usr/lib/initcpio/install
    cp ${script_path}/mkinitcpio.conf ${work_dir}/root-image/etc/mkinitcpio-parabolaiso.conf
    mkparabolaiso -v -w "${work_dir}" -D "${install_dir}" -r 'mkinitcpio -c /etc/mkinitcpio-parabolaiso.conf -k /boot/vmlinuz-linux-libre -g /boot/parabolaiso.img' run
}

# Prepare ${install_dir}/boot/
make_boot() {
    mkdir -p ${work_dir}/iso/${install_dir}/boot/${arch}
    cp ${work_dir}/root-image/boot/parabolaiso.img ${work_dir}/iso/${install_dir}/boot/${arch}/parabolaiso.img
    cp ${work_dir}/root-image/boot/vmlinuz-linux-libre ${work_dir}/iso/${install_dir}/boot/${arch}/vmlinuz
}

# Prepare /${install_dir}/boot/syslinux
make_syslinux() {
    mkdir -p ${work_dir}/iso/${install_dir}/boot/syslinux
    sed "s|%PARABOLAISO_LABEL%|${iso_label}|g;
         s|%INSTALL_DIR%|${install_dir}|g;
         s|%ARCH%|${arch}|g" ${script_path}/syslinux/syslinux.cfg > ${work_dir}/iso/${install_dir}/boot/syslinux/syslinux.cfg
    cp ${work_dir}/root-image/usr/lib/syslinux/menu.c32 ${work_dir}/iso/${install_dir}/boot/syslinux/
}

# Prepare /isolinux
make_isolinux() {
    mkdir -p ${work_dir}/iso/isolinux
    sed "s|%INSTALL_DIR%|${install_dir}|g" ${script_path}/isolinux/isolinux.cfg > ${work_dir}/iso/isolinux/isolinux.cfg
    cp ${work_dir}/root-image/usr/lib/syslinux/isolinux.bin ${work_dir}/iso/isolinux/
    cp ${work_dir}/root-image/usr/lib/syslinux/isohdpfx.bin ${work_dir}/iso/isolinux/
}

# Process aitab
make_aitab() {
    sed "s|%ARCH%|${arch}|g" ${script_path}/aitab > ${work_dir}/iso/${install_dir}/aitab
}

# Build all filesystem images specified in aitab (.fs.sfs .sfs)
make_prepare() {
    mkparabolaiso -v -w "${work_dir}" -D "${install_dir}" prepare
}

# Build ISO
make_iso() {
    mkparabolaiso -v -w "${work_dir}" -D "${install_dir}" checksum
    mkparabolaiso -v -w "${work_dir}" -D "${install_dir}" -L "${iso_label}" -o "${out_dir}" iso "${iso_name}-${iso_version}-${arch}.iso"
}

run_once make_basefs
run_once make_setup_mkinitcpio
run_once make_boot
run_once make_syslinux
run_once make_isolinux
run_once make_aitab
run_once make_prepare
run_once make_iso