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#!/usr/bin/env sh
# SPDX-License-Identifier: GPL-3.0-or-later
# SPDX-FileCopyrightText: 2022-2023 Alper Nebi Yasak <alpernebiyasak@gmail.com>
# SPDX-FileCopyrightText: 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
# SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>

set -u -e

. "include/err.sh"
. "include/option.sh"
. "include/git.sh"

export LOCALVERSION="-${projectname}-${version%%-*}"

eval "$(setvars "" arch cfgsdir codedir config config_name crossgcc_ada mode \
    elfdir listfile project target target_dir targets tree _f target1)"

main()
{
	while getopts f:b:m:u:c:x:s:l:n: option; do
		_f="${1}"
		case "${1}" in
		-b) : ;;
		-u) mode="oldconfig" ;;
		-m) mode="menuconfig" ;;
		-c) mode="distclean" ;;
		-x) mode="crossgcc-clean" ;;
		-f) mode="fetch" ;;
		-s) mode="savedefconfig" ;;
		-l) mode="olddefconfig" ;;
		-n) mode="nconfig" ;;
		*) err "Invalid option" ;;
		esac
		shift; project="${OPTARG#src/}"; shift
	done
	[ -z "${_f}" ] && err "missing flag (-m/-u/-b/-c/-x/-f/-s/-l/-n)"
	[ -z "${project}" ] && err "project name not specified"

	_cmd="build_projects"
	[ -f "config/${project}/build.list" ] && _cmd="build_targets"
	$_cmd $@
}

build_projects()
{
	[ $# -gt 0 ] && x_ ./update trees ${_f} ${@}

	if [ "${mode}" = "fetch" ]; then
		fetch_project_repo
		return 0
	fi

	codedir="src/${project}"
	[ -d "${codedir}" ] || x_ ./update trees -f "${project}"

	if [ "${project}" = "uefitool" ]; then
	(
		x_ cd src/uefitool
		cmake UEFIExtract/ || [ -f Makefile ] || \
		    err "build_projects: !cmake UEFIExtract/"
	) || err "can't build cmake on uefiextract"
	fi

	[ "${mode}" = "distclean" ] && mode="clean"
	run_make_command || return 0
}

build_targets()
{
	elfdir="elf/${project}"
	[ "${elfdir}" = "elf/coreboot" ] && \
		elfdir="elf/coreboot_nopayload_DO_NOT_FLASH"

	cfgsdir="config/${project}"
	[ -d "${cfgsdir}" ] || err "directory, ${cfgsdir}, does not exist"

	listfile="${cfgsdir}/build.list"
	[ -f "${listfile}" ] || err "list file, ${listfile}, does not exist"

	# Build for all targets if no argument is given
	[ $# -gt 0 ] && target1="${1}"
	[ "${target1}" = "utils" ] && [ "${project}" = "coreboot" ] && \
		shift 1
	targets=$(items "${cfgsdir}") || \
	    err "Cannot get options for ${cfgsdir}"
	[ $# -gt 0 ] && targets=$@

	[ -z "${mode}" ] && x_ mkdir -p "${elfdir}/"

	handle_targets
}

handle_targets()
{
	for x in ${targets}; do
		target="${x}"
		printf "Running 'make %s' for project '%s, target '%s''\n" \
		    "${mode}" "${project}" "${target}"
		[ "${project}" != "coreboot" ] || [ -n "${mode}" ] || \
			x_ ./vendor download ${target}
		x_ handle_defconfig
	done

	[ "$target1" = "utils" ] && [ "$project" = "coreboot" ] && return 0
	[ -z "${mode}" ] || return 0
	printf "Done! The files are stored under %s/\n\n" "${elfdir}"
}

handle_defconfig()
{
	handle_src_tree "${target}" || return 0

	if [ "${target1}" = "utils" ] && [ "${project}" = "coreboot" ]; then
		handle_coreboot_utils "${tree}"
		return 0
	fi

	for y in "${target_dir}/config"/*; do
		[ -f "${y}" ] || continue
		config="${y}"
		config_name="${config#"${target_dir}/config/"}"

		printf "handle/make/config %s %s: handling config %s\n" \
		    "${project}" "${target}" "${config_name}"

		[ -n "${mode}" ] || check_config || continue
		handle_makefile
		[ -n "${mode}" ] || copy_elf
	done
}

handle_src_tree()
{
	target_dir="${cfgsdir}/${target}"

	if [ "${mode}" = "fetch" ]; then
		fetch_project_trees
		return 1
	fi

	x_ mkdir -p "${elfdir}/${target}"
	eval "$(setvars "" arch tree)"

	. "${target_dir}/target.cfg" || \
	    err "handle_src_tree ${target_dir}: cannot load target.cfg"

	[ -z "${arch}" ] && err "handle_src_tree $project/$tree: arch unset"
	[ -z "${tree}" ] && err "handle_src_tree $project/$tree: tree unset"

	codedir="src/${project}/${tree}"

	if [ ! -d "${codedir}" ]; then
		if [ "${mode}" = "distclean" ] || \
		    [ "${mode}" = "crossgcc-clean" ]; then
			printf "Directory %s doesn't exist; skipping clean\n" \
			    "${codedir}" 1>&2
			return 1
		fi
		x_ ./update trees -f "${project}" "${target}"
	fi

	[ "$target1" = "utils" ] && [ "$project" = "coreboot" ] && return 0
	[ -z "${mode}" ] || return 0
	check_cross_compiler
}

# set up cross-compiler (coreboot crossgcc) for u-boot and coreboot
# (seabios and grub currently use hostcc, not crossgcc)
check_cross_compiler()
{
	[ "$project" = "u-boot" ] || [ "$project" = "coreboot" ] || return 0
	[ -z "${arch}" ] && err "${project}/${tree}: arch isn't set"

	_arch="${arch}"
	[ "${arch}" = "aarch64-elf" ] && _arch="aarch64-elf arm-eabi"

	[ "${crossgcc_ada}" = "y" ] || [ "${crossgcc_ada}" = "n" ] || \
		crossgcc_ada="y"
	[ "${crossgcc_ada}" = "y" ] || export BUILD_LANGUAGES=c

	cbdir="src/coreboot/${tree}"
	[ "${project}" != "coreboot" ] && cbdir="src/coreboot/default"
	x_ ./update trees -f coreboot ${cbdir#src/coreboot/}

	for xarch in ${_arch}; do
		[ -d "${cbdir}/util/crossgcc/xgcc/${xarch}/" ] && continue
		x_ make -C "${cbdir}" crossgcc-${xarch%-*} CPUS=$(nproc)
	done

	# we *must* ensure that u-boot's build system uses crossgcc first
	export PATH="${PWD}/${cbdir}/util/crossgcc/xgcc/bin:$PATH"
	export CROSS_COMPILE="${_arch% *}-"
}

check_config()
{
	[ -f "${config}" ] || \
		err "check_config: ${project}/${target}: configs missing"

	dest_dir="${elfdir}/${target}/${config_name}"
	# TODO: very hacky check. do it properly (based on build.list)
	for elftest in "${dest_dir}"/*; do
		[ -f "${elftest}" ] || continue
		printf "Build already exists, so skipping build\n" 1>&2
		return 1
	done
	x_ mkdir -p "${dest_dir}"
}

handle_makefile()
{
	x_ make clean -C "${codedir}"
	x_ cp "${config}" "${codedir}/.config"
	[ -n "${mode}" ] || make -C "${codedir}" silentoldconfig || \
	    make -C "${codedir}" oldconfig || :

	run_make_command || err "handle_makefile ${codedir}: no makefile!"

	if [ -e "${codedir}/.git" ] && [ "${project}" = "u-boot" ] && \
	    [ "${mode}" = "distclean" ]; then
		x_ git -C "${codedir}" clean -fdx
	elif [ "$mode" = "oldconfig" ] || [ "$mode" = "olddefconfig" ] || \
	    [ "$mode" = "menuconfig" ] || [ "$mode" = "nconfig" ]; then
		x_ cp "${codedir}/.config" "${config}"
	elif [ "${mode}" = "savedefconfig" ]; then
		x_ cp "${codedir}/defconfig" "${config}"
	fi
}

run_make_command()
{
	[ -f "${codedir}/Makefile" ] || [ -f "${codedir}/makefile" ] || \
	    [ -f "${codedir}/GNUmakefile" ] || return 1
	[ "${project}" = "coreboot" ] && [ -z "${mode}" ] && \
		x_ printf "%s\n" "${version%%-*}" >"$codedir/.coreboot-version"

	x_ make ${mode} -j$(nproc) -C "${codedir}"

	[ "${mode}" != "clean" ] && return 0
	make -C "${codedir}" distclean 2>/dev/null || :
}

copy_elf()
{
	while read -r f; do
		[ ! -f "${codedir}/$f" ] || \
			x_ cp "${codedir}/${f}" "${dest_dir}/"
	done < "${listfile}"

	x_ make clean -C "${codedir}"
}

main $@