#!/usr/bin/env bash

#   generate GRUB ELF files (coreboot payload) and configuration files
#
#	Copyright (C) 2014,2015,2020,2021,2023 Leah Rowe <info@minifree.org>
#
#	This program is free software: you can redistribute it and/or modify
#	it under the terms of the GNU General Public License as published by
#	the Free Software Foundation, either version 3 of the License, or
#	(at your option) any later version.
#
#	This program is distributed in the hope that it will be useful,
#	but WITHOUT ANY WARRANTY; without even the implied warranty of
#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#	GNU General Public License for more details.
#
#	You should have received a copy of the GNU General Public License
#	along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e

grubcfgsdir="resources/grub"
keymap=""

source "${grubcfgsdir}/modules.list"

main()
{
	printf "Creating GRUB payloads and configuration files\n"

	[ ! -d "grub/" ] && \
		./download grub
	[ ! -f "grub/grub-mkstandalone" ] && \
		./build module grub
	[ ! -d "payload/" ] && \
		mkdir -p payload/
	[ ! -d "payload/grub" ] && \
		mkdir -p payload/grub/

	rm -f payload/grub/*

	# Separate GRUB payload per keymap to save space in ROM.

	for keylayoutfile in ${grubcfgsdir}/keymap/*.gkb; do
		build_grub_payloads "${keylayoutfile}"
	done

	printf "Done! Check payload/grub/ to see the files.\n\n"
}

build_grub_payloads()
{
	keylayoutfile=${1}

	if [ ! -f "${keylayoutfile}" ]; then
		continue
	fi
	keymap="${keylayoutfile##${grubcfgsdir}/keymap/}"
	keymap="${keymap%.gkb}"

	build_grub_elf "${keylayoutfile}"
	create_grub_config

	printf "Created 'payload/grub/grub_%s.elf' and configs.'\n" \
			"${keymap}"
}

build_grub_elf()
{
	keylayoutfile=${1}

	gcfg="/boot/grub/grub.cfg=${grubcfgsdir}"
	gcfg="${gcfg}/config/grub_memdisk.cfg"
	grubk="/boot/grub/layouts/${keymap}.gkb=${keylayoutfile}"
	grub/grub-mkstandalone \
			--grub-mkimage="grub/grub-mkimage" \
			-O i386-coreboot \
			-o payload/grub/grub_${keymap}.elf \
			-d grub/grub-core/ \
			--fonts= --themes= --locales=  \
			--modules="${grub_modules}" \
			--install-modules="${grub_install_modules}" \
			${gcfg} ${grubk}
}

create_grub_config()
{
	sed "s/usqwerty/${keymap}/" \
			< ${grubcfgsdir}/config/grub.cfg \
			> payload/grub/grub_${keymap}.cfg
	sed "s/grubtest.cfg/grub.cfg/" \
			< payload/grub/grub_${keymap}.cfg \
			> payload/grub/grub_${keymap}_test.cfg
}

main $@