WIP: chromebook integration script

I intend to merge every Chromebook that Mrchromebox supports,
into Libreboot, ready for the Libreboot 25.12 release. Work
is still ongoing, and several changes need to happen in lbmk.

I started working on it a few weeks ago (today is
14 November 2025 as I push this).

Still TODO:

* Automatically create lbmk coreboot targets, based
  on the configs present in MrChromebox git
* Re-work git repository management in lbmk, such that
  a list of upstreams is used, instead of a hardcoded
  list per configuration; this will allow us to use
  different remotes across the same project, even where
  they diverge. This would then allow us to use the
  MrChromebook repository directly, instead of cherry-picking
  patches into upstream coreboot
* The note above about remotes would also mean that we can
  use MrChromebox's own edk2 repository directly. All of this
  would reduce the burden on lbmk.git
* Support building edk2 payloads, exactly mirroring the
  setups used on MrChromebox builds

There are some things that need to be checked first, for
boards that use MMC-based or eMMC-based storage, for the
GRUB and SeaBIOS payloads, also U-Boot, because I will
also be using these.

As such, this current script shall sit in lbmk master, but
it is not yet finished.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/chromebook.sh

@@ -0,0 +1,130 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Copyright (c) 2025 Leah Rowe <leah@libreboot.org>
+
+# Import MrChromebox project into xbmk
+
+# NOTE: variable naming scheme:
+#  mr_ for variables/functions dealing with MrChromebox
+#  mx_ for variables/functions pertaining to Libreboot setup
+#	because i am a non-binary blob
+
+spdx="# SPDX-License-Identifier: GPL-3.0-or-later"
+
+# temporary work variables
+mr_tmpdir="" # dir to clone tmp repos in
+
+# 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()
+{
+	if [ -f "$xbmkpwd/CHANGELOG" ]; then
+		err "Project import disabled on releases" "prep_mr_import" "$@"
+	fi
+
+	mr_tmpdir="`mktemp -d || err "can't make mrtmpdir"`" || \
+	    err "can't make mrtmpdir" "prep_mr_coreboot" "$@"
+	x_ remkdir "$mr_tmpdir"
+
+	x_ prep_mx_edk2conf
+
+	x_ prep_mr_projects
+
+	x_ rm -Rf "$mr_tmpdir"
+}
+
+# create config/git/edk2/pkg.cfg
+prep_mx_edk2conf()
+{
+	x_ remkdir "config/git/edk2"
+
+	x_ prep_mr_file "config/git/edk2/pkg.cfg" \
+	    "$spdx" \
+	    "" \
+	    "rev=\"HEAD\"" \
+	    "url=\"https://codeberg.org/libreboot/edk2\"" \
+	    "bkup_url=\"https://git.disroot.org/libreboot/edk2\""
+}
+
+# prep config/PROJECT/TREE/ for various projects
+prep_mr_projects()
+{
+	x_ prep_mr "coreboot" "$mr_cbrepo" "$mr_cbbranch" "$mr_cbrev" \
+	    "$mr_cbrevbase" "$mr_cbtree"
+	x_ prep_mr "edk2" "$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="$6"
+
+	x_ prep_mr_clone "$@"
+	x_ prep_mr_patch "$@"
+	x_ prep_mr_file "config/$1/$6/target.cfg" \
+	    "$spdx" \
+	    "" \
+	    "tree=\"$6\"" \
+	    "rev=\"$5\""
+}
+
+prep_mr_clone()
+{
+	mr_tmpclone="$mr_tmpdir/$1"
+
+	x_ git clone "$2" "$mr_tmpclone"
+
+	x_ git -C "$mr_tmpclone" checkout "$3"
+	# we don't reset, because we format-patch between revbase..rev
+}
+
+prep_mr_patch()
+{
+	mr_tmpclone="$mr_tmpdir/$1"
+	mx_patchdir="config/$1/$6/patches"
+
+	x_ remkdir "$mx_patchdir"
+	if [ "$4" != "$5" ]; then
+		x_ git -C "$mr_tmpclone" format-patch $5..$4
+		x_ mv "$mr_tmpclone"/*.patch "$mx_patchdir"
+	fi
+	# if no patches were created, rmdir will succeed
+	rmdir "$mx_patchdir" 1>/dev/null 2>/dev/null || :
+}
+
+prep_mr_file()
+{
+	mr_filename="$1"
+	shift 1
+
+	x_ rm -f "$mr_filename"
+
+	while [ $# -gt 0 ]
+	do
+		printf "%s\n" "$1" >> "$mr_filename" || \
+		    err "Can't write '$1' to '$mr_filename'" prep_mr_file "$@"
+		shift 1
+	done
+
+	printf "Created '%s'\n" "$mr_filename"
+}