Merge branch 'jk/no-optional-locks'

Some commands (most notably "git status") makes an opportunistic
update when performing a read-only operation to help optimize later
operations in the same repository.  The new "--no-optional-locks"
option can be passed to Git to disable them.

* jk/no-optional-locks:
  git: add --no-optional-locks option

git.c

@@ -182,6 +182,10 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 			setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
 			if (envchanged)
 				*envchanged = 1;
+		} else if (!strcmp(cmd, "--no-optional-locks")) {
+			setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1);
+			if (envchanged)
+				*envchanged = 1;
 		} else if (!strcmp(cmd, "--shallow-file")) {
 			(*argv)++;
 			(*argc)--;