X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=bin%2Fextract_git_sha1;h=828387016b2c7e4954cf24564805964afd654f39;hb=9edd0b5ddf406ef089edebd12999ff2a26774ca3;hp=e6e6731a36cca5965d76c1e27c091331092032f9;hpb=fa31b1095eeea97695125ad5770239805bed37da;p=mesa.git

diff --git a/bin/extract_git_sha1 b/bin/extract_git_sha1
index e6e6731a36c..828387016b2 100755
--- a/bin/extract_git_sha1
+++ b/bin/extract_git_sha1
@@ -1,10 +1,20 @@
 #!/bin/sh
-touch src/mesa/main/git_sha1.h
+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
+	> 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