+
+def write_git_sha1_h_file(filename):
+ """Mesa looks for a git_sha1.h file at compile time in order to display
+ the current git hash id in the GL_VERSION string. This function tries
+ to retrieve the git hashid and write the header file. An empty file
+ will be created if anything goes wrong."""
+
+ args = [ 'git', 'log', '-n', '1', '--oneline' ]
+ try:
+ (commit, foo) = subprocess.Popen(args, stdout=subprocess.PIPE).communicate()
+ except:
+ # git log command didn't work
+ if not os.path.exists(filename):
+ # create an empty file if none already exists
+ f = open(filename, "w")
+ f.close()
+ return
+
+ commit = '#define MESA_GIT_SHA1 "git-%s"\n' % commit[0:7]
+ tempfile = "git_sha1.h.tmp"
+ f = open(tempfile, "w")
+ f.write(commit)
+ f.close()
+ if not os.path.exists(filename) or not filecmp.cmp(tempfile, filename):
+ # The filename does not exist or it's different from the new file,
+ # so replace old file with new.
+ if os.path.exists(filename):
+ os.remove(filename)
+ os.rename(tempfile, filename)
+ return
+
+
+# Create the git_sha1.h header file
+write_git_sha1_h_file("main/git_sha1.h")
+# and update CPPPATH so the git_sha1.h header can be found
+env.Append(CPPPATH = ["#" + env['build_dir'] + "/mesa/main"])
+
+