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-rw-r--r--mesalib/bin/extract_git_sha130
1 files changed, 20 insertions, 10 deletions
diff --git a/mesalib/bin/extract_git_sha1 b/mesalib/bin/extract_git_sha1
index cf3006f8f..828387016 100644
--- a/mesalib/bin/extract_git_sha1
+++ b/mesalib/bin/extract_git_sha1
@@ -1,10 +1,20 @@
-#!/bin/sh
-touch src/mesa/main/git_sha1.h
-if which git > /dev/null; then
- # Extract the 7-digit "short" SHA1 for the current HEAD, convert
- # it to a string, and wrap it in a #define. This is used in
- # src/mesa/main/version.c to put the GIT SHA1 in the GL_VERSION string.
- git log -n 1 --oneline |\
- sed 's/^\([^ ]*\) .*/#define MESA_GIT_SHA1 "git-\1"/' \
- > src/mesa/main/git_sha1.h
-fi
+#!/bin/sh
+if [ ! -f src/mesa/main/git_sha1.h ]; then
+ touch src/mesa/main/git_sha1.h
+fi
+
+if [ ! -d .git ]; then
+ exit
+fi
+
+if which git > /dev/null; then
+ # Extract the 7-digit "short" SHA1 for the current HEAD, convert
+ # it to a string, and wrap it in a #define. This is used in
+ # src/mesa/main/version.c to put the GIT SHA1 in the GL_VERSION string.
+ git log -n 1 --oneline |\
+ sed 's/^\([^ ]*\) .*/#define MESA_GIT_SHA1 "git-\1"/' \
+ > src/mesa/main/git_sha1.h.tmp
+ if ! cmp -s src/mesa/main/git_sha1.h.tmp src/mesa/main/git_sha1.h; then
+ mv src/mesa/main/git_sha1.h.tmp src/mesa/main/git_sha1.h
+ fi
+fi