# SPDX-License-Identifier: GPL-3.0-or-later

# Copyright (c) 2025 Leah Rowe <leah@libreboot.org>

# Assimilate MrChromebox coreboot distro, adapting its ports
# for use in the Libreboot build system. This will create a
# *patch* file for Libreboot, from the current lbmk commit.

# These functions are used with the "./mk mrchromebox" command.
# MrChromebox has a habit of using branches per project, each
# branch being a given release. He does his changes on top of
# upstream and goes from there.

# The coreboot build system (upstream one) already integrates
# MrChromebox edk2 quite heavily, so Mrchromebox's own project
# doesn't need a complicated external build system like lbmk.
# He relies on pre-baked configs, that he provides, and uses
# these to build the machines.

spdx="# SPDX-License-Identifier: GPL-3.0-or-later"

mr_tmprepos="" # dir to clone tmp repos in

# we will use the upstream edk2 repo, but create trees
# for mrchromebox's patches. this is because i will be
# using edk2 for other projects in the future
# NOTE: these mirror https://github.com/tianocore/edk2.git 
mx_edk2gitconf="config/git/edk2/pkg.git"
mx_edk2repo="https://codeberg.org/libreboot/edk2"
mx_edk2repo_bkup="https://git.disroot.org/libreboot/edk2"

# Now the repos to import. Please note:
# These won't be used directly in xbmk. They're being used
# to pull patches and configs from, that mrchromebox uses.
# "rev" is the rev from mrchromebox. "revbase" is the upstream
# rev that his patches derive from.
# so we format-patch from there to HEAD(=e.g. mr_cbrev)

# NOTE: upstream for our purposes: https://review.coreboot.org/coreboot
mr_cbrepo="https://github.com/mrchromebox/coreboot"
mr_cbbranch="MrChromebox-2503" # branch in mrchromebox
mr_cbrev="ecd9fa6a177e00132ec214252a2b9cebbb01e25f" # relative to base
mr_cbrevbase="38f5f7c48024d9fca4b6bbd88914423c34da709c" # 25.03 upstream base
mr_cbtree="chromebook" # tree name in xbmk

# NOTE: upstream for our purposes: https://github.com/tianocore/edk2.git
mr_edk2repo="https:/github.com/mrchromebox/edk2"
mr_edk2branch="uefipayload_2502" # branch in mrchromebox
mr_edk2rev="feaf6b976b7cc72a18ed364f273751c943a9e7d0" # relative to base
mr_edk2revbase="fbe0805b2091393406952e84724188f8c1941837" # 2025.02 upstream
mr_edk2tree="chromebook" # tree name in xbmk

# mxlibreboot was here
prep_mr_import()
{
	prep_mx_edk2conf

	prep_mr_target
}

# create config/git/edk2/pkg.cfg
prep_mx_edk2conf()
{
	x_ remkdir "${mx_edk2gitconf%/*}"

	printf "%s\n\n" "$spdx" > "$mx_edk2gitconf" \
	    err "Can't write SPDX to '$mx_edk2gitconf'" prep_mr_edk2conf "$@"

	printf "rev=\"HEAD\"\n\n" >> "$mx_edk2gitconf" \
	    err "Can't write HEAD to '$mx_edk2gitconf'" prep_mr_edk2conf "$@"

	printf "url=\"%s\"\n\n" "$mx_edk2repo" >> "$mx_edk2gitconf" \
	    err "Can't write repo to '$mx_edk2gitconf'" prep_mr_edk2conf "$@"

	printf "url=\"%s\"\n\n" "$mx_edk2repo_bkup" >> "$mx_edk2gitconf" \
	    err "Can't write bkup to '$mx_edk2gitconf'" prep_mr_edk2conf "$@"
}

# prep config/PROJECT/TREE/ for various projects
prep_mr_target()
{
	mr_tmprepos="`mktemp -d || err "can't make mrtmpdir"`" || \
	    err "can't make mrtmpdir" "prep_mr_coreboot" "$@"
	x_ remkdir "$mr_tmprepos"

	prep_mr "coreboot" "$mr_cbrepo" "$mr_cbbranch" "$mr_cbrev" \
	    "$mr_cbrevbase" "$mr_cbtree"
	prep_mr "edk2" "$mr_edk2repo" "$mr_edk2branch" "$mr_edk2rev" \
	    "$mr_edk2revbase" "$mr_edk2tree"
}

# create config/PROJECT/TREE/target.cfg
# and config/PROJECT/TREE/patches/
prep_mr()
{
	mr_projectname="$1"
	mr_repo="$2"
	mr_branch="$3"
	mr_rev="$4"
	mr_revbase="$5"
	mr_tree="$6"

	mr_tmpclone="$mr_tmprepos/$mr_projectname"
	mr_patchdir="config/$mr_projectname/$mr_tree/patches"

	x_ git clone "$mr_repo" "$mr_tmpclone"
	x_ git -C "$mr_tmpclone" checkout "$mr_branch"
	x_ git -C "$mr_tmpclone" reset --hard "$mr_rev"
	x_ git -C "$mr_tmpclone" format-patch $mr_revbase..HEAD

	x_ remkdir "$mr_patchdir"
	x_ mv "$mr_tmpclone"/*.patch "$mr_patchdir"

	# if no patches were created, rmdir will succeed
	rmdir "$mr_patchdir" 1>/dev/null 2>/dev/null || :

	x_ prep_mr_targetconf "$@"

	x_ rm -Rf "$mr_tmpclone"
}

prep_mr_targetconf()
{
	# prep the actual tree, after the patches were done
	mr_targetconf="config/$1/$6/target.cfg"

	printf "%s\n\n" "$spdx" > \
	    err "Can't write SPDX to '$mr_targetconf'" prep_mr_targetconf "$@"

	printf "tree=\"%s\"\n" "$6" >> "$mr_targetconf" || \
	    err "Can't write tree $6 '$mr_targetconf'" prep_mr_targetconf "$@"
	printf "rev=\"%s\"\n" "$5" >> "$mr_targetconf" || \
	    err "Can't write rev $5 '$mr_targetconf'" prep_mr_targetconf "$@"

	printf "Created '%s'\n" "$mr_targetconf"
}