utils: update-mojo.sh: Add script for updating mojo

Add a script to ease updating mojo from a chromium source tree.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

utils/update-mojo.sh

@@ -0,0 +1,66 @@
+#!/bin/sh
+
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Update mojo copy from a chromium source tree
+
+if [ $# != 1 ] ; then
+	echo "Usage: $0 <chromium dir>"
+	exit 1
+fi
+
+ipc_dir="$(dirname "$(realpath "$0")")/ipc"
+chromium_dir="$1"
+
+if [ ! -d "${chromium_dir}/mojo" ] ; then
+	echo "Directory ${chromium_dir} doesn't contain mojo"
+	exit 1
+fi
+
+if [ ! -d "${chromium_dir}/.git" ] ; then
+	echo "Directory ${chromium_dir} doesn't contain a git tree"
+	exit 1
+fi
+
+# Get the chromium commit id
+version=$(git -C "${chromium_dir}" rev-parse --short HEAD)
+
+# Reject dirty trees
+if [ -n "$(git -C "${chromium_dir}" status --porcelain)" ] ; then
+	echo "Chromium tree in ${chromium_dir} is dirty"
+	exit 1
+fi
+
+# Copy the diagnosis file
+cp "${chromium_dir}/tools/diagnosis/crbug_1001171.py" "${ipc_dir}/tools/diagnosis"
+
+# Copy the rest of mojo
+cp "${chromium_dir}/mojo/public/LICENSE" "${ipc_dir}/mojo/public"
+
+rm -rf "${ipc_dir}/mojo/public/tools/*"
+
+(
+	cd "${chromium_dir}" || exit
+	find ./mojo/public/tools -type f \
+	     -not -path "*/generators/*" \
+	     -not -path "*/fuzzers/*" \
+	     -exec cp --parents "{}" "${ipc_dir}" ";"
+)
+
+# Update the README files
+readme=$(cat <<EOF
+# SPDX-License-Identifier: CC0-1.0
+
+Files in this directory are imported from ${version} of Chromium. Do not
+modify them manually.
+EOF
+)
+
+echo "$readme" > "${ipc_dir}/mojo/README"
+echo "$readme" > "${ipc_dir}/tools/README"
+
+cat <<EOF
+------------------------------------------------------------
+mojo updated. Please review and up-port local changes before
+committing.
+------------------------------------------------------------
+EOF