gitconfig: upate commit-msg if newer one is available

Change-Id: Iea010bf6f456a5ce5d8906821c95a7de4b577085
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: zbao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/1429
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/Makefile.inc b/Makefile.inc
index 083d423..4c2bb4c 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -291,7 +291,13 @@
 	rm -f $$LINTLOG
 
 gitconfig:
-	for hook in commit-msg pre-commit; do if ! [ -x .git/hooks/$$hook ]; then cp util/gitconfig/$$hook .git/hooks/$$hook; chmod +x .git/hooks/$$hook; fi; done
+	for hook in commit-msg pre-commit ; do                       \
+		if [ util/gitconfig/$$hook -nt .git/hooks/$$hook -o  \
+		! -x .git/hooks/$$hook ]; then			     \
+			cp util/gitconfig/$$hook .git/hooks/$$hook;  \
+			chmod +x .git/hooks/$$hook;		     \
+		fi;						     \
+	done
 	(git config --global user.name >/dev/null && git config --global user.email >/dev/null) || (printf 'Please configure your name and email in git:\n\n git config --global user.name "Your Name Comes Here"\n git config --global user.email your.email@example.com\n'; exit 1)
 
 crossgcc: clean-for-update