update/project/*: unified git reset handling

With this change, lbmk now also updates submodules on
simple git clones, not just multi-tree clones.

This is OK, because git does not return non-zero status
when git submodule update is ran, where git submodules
are not actually defined.

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

include/git.sh

@@ -1,6 +1,20 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 # SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>
 
+git_reset_rev()
+{
+	sdir="${1}"
+	_rev="${2}"
+	_fail="${3}"
+	(
+	cd "${sdir}" || "${_fail}" "cannot cd to ${sdir}"
+	git reset --hard ${_rev} || \
+	    "${_fail}" "cannot git reset ${sdir} <- ${rev}"
+	git submodule update --init --checkout || \
+	    "${_fail}" "cannot update git modules <- ${sdir}"
+	)
+}
+
 git_am_patches()
 {
 	sdir="${1}" # assumed to be absolute path

script/update/project/repo

@@ -79,11 +79,8 @@ clone_project()
 
 	git clone ${url} "${tmp_dir}" || git clone ${bkup_url} "${tmp_dir}" || \
 	    fail "clone_project: could not download ${name}"
-	(
-	cd "${tmp_dir}" || fail "clone_project: tmpdir not created"
-	git reset --hard ${revision} || \
-	    fail "clone_project: Cannot reset revision"
-	)
+	git_reset_rev "${tmp_dir}" "${revision}" "fail" || \
+	    fail "clone_project ${location}/: cannot reset <- ${revision}"
 	git_am_patches "${tmp_dir}" "${PWD}/config/${name}/patches" "fail" || \
 	    fail "clone_project ${location}/: cannot apply patches"
 

script/update/project/trees

@@ -143,13 +143,9 @@ prepare_new_tree()
 
 	cp -R "${project}/${project}" "${project}/${tree}" || \
 	    err "${project}/${tree}: cannot copy source tree"
-	(
-	cd "${project}/${tree}" || err "cannot cd to ${project}/${tree}"
-	git reset --hard ${rev} || \
-	    err "cannot reset ${project} revision for tree, ${tree}"
-	git submodule update --init --checkout || \
-	    err "cannot update ${project} submodules for tree, ${tree}"
-	)
+	git_reset_rev "${project}/${tree}" "${rev}" "err" || \
+	    err "prepare_new_trees ${project}/${tree}: cannot reset <- ${rev}"
+
 	git_am_patches "${PWD}/${project}/${tree}" \
 	    "${PWD}/${cfgsdir}/${tree}/patches" "err" || \
 	    err "prepare_new_trees ${project}/${tree}: cannot apply patches"