util/lint: Add check to make sure 'coreboot' is lowercase

- Excludes certain phrases which can't be changed.
- Checks last commit message if code is in a repo.

Change-Id: I6b52342488dacc56ef6083db5503507af35d41ac
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20032
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/lint/lint-stable-021-coreboot-lowercase

@@ -0,0 +1,33 @@
+#!/bin/sh
+# This file is part of the coreboot project.
+#
+# Copyright (C) 2017 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# DESCR: Verify that the word 'coreboot' is lowercase
+
+LC_ALL=C export LC_ALL
+
+EXCLUDE='^3rdparty/\|util/crossgcc/xgcc\|Binary file\|coreboot\|COREBOOT\|CorebootPayload\|CorebootModule\|minnowboard.org/Coreboot'
+
+# Use git grep if the code is in a git repo, otherwise use grep.
+if [ -n "$(command -v git)" ] && [ -d .git ]; then
+	GREP_FILES="git grep -in"
+
+	# Check last commit message
+	if [ -n "$(git log -n 1 | grep -i 'coreboot' | grep -v "$EXCLUDE" )" ]; then
+		echo "'coreboot' should be lowercase in commit message"
+	fi
+else
+	GREP_FILES="grep -rin"
+fi
+
+${GREP_FILES} "coreboot" | grep -v "$EXCLUDE";