[Mesa-dev] [PATCH] automake: increase the MESA_GIT_SHA1 hash id length from 7 to 10 digits

[Brian Paul]

The SCons build has been using 10 digits of the git hash id for the
MESA_GIT_SHA1 string in git_sha1.h for about a year now.  I bumped it
up after running into a case where a 7-digit hash ID was ambiguous.

This patch makes the same change for the autotools build.

The command "git log | grep "^commit" | cut -b 8-14 | sort | uniq -d"
shows there are currently 17 cases where 7 digits of hash id are
ambiguous on master (probably quite a few more if we'd consider other
branches).

Instead of using "git log -n 1 --oneline" use
"git rev-parse --short=10 HEAD" to get the HEAD hash id.

v2: use printf instead of sed, per Eric's suggestion.
---
 src/Makefile.am | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index aa5f8aa..df912c4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -28,8 +28,8 @@ git_sha1.h.tmp:
 	@touch git_sha1.h.tmp
 	@if test -e $(top_srcdir)/.git; then \
 		if which git > /dev/null; then \
-		    git --git-dir=$(top_srcdir)/.git log -n 1 --oneline | \
-			sed 's/^\([^ ]*\) .*/#define MESA_GIT_SHA1 "git-\1"/' \
+			printf '#define MESA_GIT_SHA1 "git-%s"\n' \
+			`git --git-dir=$(top_srcdir)/.git rev-parse --short=10 HEAD` \
 			> git_sha1.h.tmp ; \
 		fi \
 	fi
-- 
1.9.1