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#!/usr/bin/env sh
# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright (c) 2022-2023 Alper Nebi Yasak <alpernebiyasak@gmail.com>
# Copyright (c) 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
# Copyright (c) 2023-2024 Leah Rowe <leah@libreboot.org>

set -u -e

. "include/lib.sh"
. "include/git.sh"

eval `setvars "" xarch srcdir premake cmakedir xlang mode makeargs elfdir cmd \
    project target target_dir targets xtree _f release bootstrapargs mkhelper \
    autoconfargs listfile autogenargs btype tree rev tree_depend build_depend \
    defconfig postmake mkhelpercfg dry dest_dir mdir`; badhash="n"

main()
{
	while getopts f:b:m:u:c:x:s:l:n:d: option; do
		[ -n "$_f" ] && $err "only one flag is permitted"
		_f="$1" && [ "$_f" = "-d" ] && dry=":"
		case "$1" in
		-d) mode="" ;;
		-b) mode="" ;;
		-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" ;;
		*) $err "invalid option '-$option'" ;;
		esac
		[ -z "${OPTARG+x}" ] && shift 1 && break
		project="${OPTARG#src/}"; shift 2
	done
	[ -z "$_f" ] && $err "missing flag (-m/-u/-b/-c/-x/-f/-s/-l/-n)"
	[ -z "$project" ] && for p in $(ls -1 config/git); do
		./mk $_f "$p" || $err "!./mk $_f $p"; :
	done && return 1

	[ -f "config/git/$project/pkg.cfg" ] || $err "'$project' not defined"

	for d in "elf" "config/data" "config" "src"; do
		eval "${d#*/}dir=\"$d/$project\""
	done; dest_dir="$elfdir"
	listfile="$datadir/build.list"
	[ -f "$listfile" ] || listfile="" # optional on all projects

	mkhelpercfg="$datadir/mkhelper.cfg"
	e "$mkhelpercfg" f missing && mkhelpercfg="$TMPDIR/mkhelper.cfg" && \
	    x_ touch "$mkhelpercfg"

	targets="$@"; cmd="build_targets $targets"
	singletree "$project" && cmd="build_project"

	remkdir "${tmpgit%/*}"
}

build_project()
{
	configure_project "$configdir" || return 0
	[ ! -f "$listfile" ] || $dry elfcheck || return 0

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

	[ -n "$mode" ] || $dry copy_elf; return 0
}

build_targets()
{
	[ -d "$configdir" ] || $err "directory, $configdir, does not exist"
	[ $# -gt 0 ] || targets="$(ls -1 "$configdir")" || $err "!o $configdir"

	for x in $targets; do
		[ "$x" = "list" ] && x_ ls -1 "config/$project" && \
		    listfile="" && break
		target="$x"
		printf "'make %s', '%s', '%s'\n" "$mode" "$project" "$target"
		x_ handle_defconfig
		[ -n "$mode" ] || [ -z "$postmake" ] || $postmake || \
		    $err "$project/$target: !postmake: $postmake"; continue
	done; return 0
}

handle_defconfig()
{
	target_dir="$configdir/$target"

	[ -f "CHANGELOG" ] || fetch_project "$project"
	configure_project "$target_dir" || return 0
	x_ mkdir -p "$elfdir/$target"

	chkvars tree; srcdir="src/$project/$tree"

	if [ "$mode" = "distclean" ] || [ "$mode" = "crossgcc-clean" ]; then
		[ -d "$srcdir" ] || return 0
	fi
	[ -z "$mode" ] && $dry check_cross_compiler

	for y in "$target_dir/config"/*; do
		[ "$_f" = "-d" ] || [ -f "$y" ] || continue
		[ "$_f" = "-d" ] || defconfig="$y"

		[ -n "$mode" ] || check_defconfig || continue
		handle_makefile
		[ -n "$mode" ] || $dry copy_elf
	done; return 0
}

configure_project()
{
	eval `setvars "" xarch xlang build_depend autoconfargs xtree postmake \
	    tree_depend makeargs btype mkhelper bootstrapargs premake release`
	_tcfg="$1/target.cfg"; badhash="n"; [ -f "$_tcfg" ] || btype="auto"
	[ -f "$datadir/mkhelper.cfg" ] && eval `setcfg "$datadir/mkhelper.cfg"`

	while [ -f "$_tcfg" ] || [ "$cmd" != "build_project" ]; do
		eval `setvars "" rev tree`; eval `setcfg "$_tcfg"`
		printf "Loading %s config: %s\n" "$project" "$_tcfg"

		[ "$_f" = "-d" ] && build_depend="" # dry run
		[ "$cmd" = "build_project" ] && break
		[ "$mode" = "fetch" ] || break

		[ "${_tcfg%/*/target.cfg}" = "${_tcfg%"/$tree/target.cfg"}" ] \
		    && break; _tcfg="${_tcfg%/*/target.cfg}/$tree/target.cfg"
	done
	[ "$XBMK_RELEASE" = "y" ] && [ "$release" = "n" ] && return 1
	[ -z "$btype" ] || [ "${mode%config}" = "$mode" ] || return 1
	[ -z "$mode" ] && build_dependencies

	mdir="$PWD/config/submodule/$project"
	[ -n "$tree" ] && mdir="$mdir/$tree"
	[ -f "CHANGELOG" ] || check_project_hashes

	[ "$mode" = "fetch" ] || x_ ./mk -f "$project" $target
	[ "$mode" = "fetch" ] || return 0
	[ -f "CHANGELOG" ] && return 1; fetch_${cmd#build_}; return 1
}

build_dependencies()
{
	for bd in $build_depend; do
		bd_p="${bd%%/*}"; bd_t="${bd##*/}"
		[ -z "$bd_p" ] && $dry $err "$project/$tree: !bd '$bd'"
		[ "${bd##*/}" = "$bd" ] && bd_t=""
		[ -z "$bd_p" ] || $dry ./mk -b $bd_p $bd_t \
		    || $err "!mk $project/$tree $bd_p/$bd_t"; continue
	done; return 0
}

check_project_hashes()
{
	mkdir -p "$XBMK_CACHE/hash" || $err "!mkdir '$XBMK_CACHE/hash'"
	old_pjhash=""; [ ! -f "$XBMK_CACHE/hash/$project$tree" ] || \
	    read -r old_pjhash < "$XBMK_CACHE/hash/$project$tree"

	x_ rm -f "$TMPDIR/project.list" "$TMPDIR/project.hash" \
	    "$TMPDIR/project.tmp"; x_ touch "$TMPDIR/project.tmp"
	x_ touch "$TMPDIR/project.hash"

	for rmchk in "$datadir" "$configdir/$tree" "$mdir"; do
		[ -d "$rmchk" ] || continue
		find "$rmchk" -type f -not -path "*/.git*/*" >> \
		    "$TMPDIR/project.tmp" || $err "!find $rmchk > project.tmp"
	done; sort "$TMPDIR/project.tmp" > "$TMPDIR/project.list" || \
	    $err "!sort project tmp/list"

	while read -r rmchk; do
		[ ! -f "$rmchk" ] || sha512sum "$rmchk" | awk \
		    '{print $1}' >> "$TMPDIR/project.hash" || $err "!h $rmchk"
	done < "$TMPDIR/project.list"

	pjhash="$(sha512sum "$TMPDIR/project.hash" | awk '{print $1}')" || :
	badhash="y" && [ "$pjhash" = "$old_pjhash" ] && badhash="n"
	[ -f "$XBMK_CACHE/hash/$project$tree" ] || badhash="y"

	printf "%s\n" "$pjhash" > "$XBMK_CACHE/hash/$project$tree" || \
	    $err "!mk $XBMK_CACHE/hash/$project$tree"

	[ "$badhash" = "n" ] || rm -Rf "src/$project/$tree" \
	    "elf/$project/$tree" "elf/$project/$target" || \
	    $err "!rm $project $tree"; :
}

check_cross_compiler()
{
	xgccargs="UPDATED_SUBMODULES=1 CPUS=$XBMK_THREADS"
	for _xarch in $xarch; do
		cbdir="src/coreboot/$tree"
		[ "$project" != "coreboot" ] && cbdir="src/coreboot/default"
		[ -n "$xtree" ] && cbdir="src/coreboot/$xtree"

		x_ ./mk -f coreboot ${cbdir#src/coreboot/}

		export PATH="$PWD/$cbdir/util/crossgcc/xgcc/bin:$PATH"
		export CROSS_COMPILE="${xarch% *}-"
		[ -n "$xlang" ] && export BUILD_LANGUAGES="$xlang"

		# sometimes buildgcc fails for like no reason. try twice.
		make -C "$cbdir" crossgcc-${_xarch%-*} $xgccargs || \
		    make -C "$cbdir" crossgcc-${_xarch%-*} $xgccargs || \
		    $err "!mkxgcc $project/$xtree '${_xarch%-*}' '$xgccargs'"
	done; return 0
}

check_defconfig()
{
	[ -f "$defconfig" ] || $dry $err "$project/$target: missing defconfig"
	dest_dir="$elfdir/$target/${defconfig#"$target_dir/config/"}"

	$dry elfcheck || return 1 # skip build if a previous one exists
	$dry x_ mkdir -p "$dest_dir"
}

elfcheck()
{
	# TODO: very hacky check. do it properly (based on build.list)
	for elftest in "$dest_dir"/*; do
		[ -e "$elftest" ] && e "$elftest" f && return 1
	done; return 0
}

handle_makefile()
{
	$dry check_makefile "$srcdir" && x_ make clean -C "$srcdir"
	[ -f "$defconfig" ] && x_ cp "$defconfig" "$srcdir/.config"
	[ -n "$mode" ] || [ -n "$btype" ] || $dry make -C \
	    "$srcdir" silentoldconfig || make -C "$srcdir" oldconfig || :

	run_make_command || $err "handle_makefile $srcdir: no makefile!"

	_copy=".config" && [ "$mode" = "savedefconfig" ] && _copy="defconfig"
	[ "${mode%config}" = "$mode" ] || \
	    $dry x_ cp "$srcdir/$_copy" "$defconfig"

	[ -e "$srcdir/.git" ] && [ "$project" = "u-boot" ] && \
	    [ "$mode" = "distclean" ] && $dry x_ git -C "$srcdir" clean -fdx; :
}

run_make_command()
{
	[ -z "$premake" ] || [ -n "$mode" ] || $premake || $err "!$premake"
	$dry check_cmake "$srcdir" && [ -z "$mode" ] && $dry check_autoconf \
	    "$srcdir"; $dry check_makefile "$srcdir" || return 1

	$dry make -C "$srcdir" $mode -j$XBMK_THREADS $makeargs || $err "!$mode"
	[ -z "$mkhelper" ] || [ -n "$mode" ] || $mkhelper || $err "!$mkhelper"

	[ "$mode" = "clean" ] && $dry make -C "$srcdir" distclean || :; :
}

check_cmake()
{
	[ -z "$cmakedir" ] || $dry check_makefile "$1" || cmake -B "$1" \
	    "$1/$cmakedir" || $dry check_makefile "$1" || $err \
	    "$1: !cmk $cmakedir"
	[ -z "$cmakedir" ] || $dry check_makefile "$1" || \
	    $err "check_cmake $1: can't generate Makefile"; return 0
}

check_autoconf()
{
	(
	cd "$1" || $err "!cd $1"
	[ -f "bootstrap" ] && x_ ./bootstrap $bootstrapargs
	[ -f "autogen.sh" ] && x_ ./autogen.sh $autogenargs
	[ -f "configure" ] && x_ ./configure $autoconfargs; return 0
	) || $err "can't bootstrap project: $1"
}

check_makefile()
{
	[ -f "$1/Makefile" ] || [ -f "$1/makefile" ] || \
	    [ -f "$1/GNUmakefile" ] || return 1; return 0
}

copy_elf()
{
	[ -f "$listfile" ] && x_ mkdir -p "$dest_dir" && while read -r f; do
		[ -f "$srcdir/$f" ] && x_ cp "$srcdir/$f" "$dest_dir"
	done < "$listfile"; x_ make clean -C "$srcdir"
}

main $@ || exit 0
. "$mkhelpercfg"
$cmd