mesa: don't touch git_sha1.h if sha1 didn't change

Reviewed-by: Dan Nicholson <dbn.lists@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/bin/extract_git_sha1 b/bin/extract_git_sha1
index e6e6731a36cca5965d76c1e27c091331092032f9..5e635d4b74d40e0e3390195864634a247857540a 100755 (executable)
--- a/bin/extract_git_sha1
+++ b/bin/extract_git_sha1
@@ -1,10 +1,16 @@
 #!/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 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

diff --git a/src/mesa/main/.gitignore b/src/mesa/main/.gitignore
index e48030ecf7a8c00b4c5eb257f3a6b74c353a5d87..2575f44df4aae585371fe094c3353841293140a0 100644 (file)
--- a/src/mesa/main/.gitignore
+++ b/src/mesa/main/.gitignore
@@ -3,3 +3,4 @@ api_exec_es2.c
 get_es1.c
 get_es2.c
 git_sha1.h
+git_sha1.h.tmp