Merge branch 'status-no-lock-index'

This branch allows third-party tools to call `git status
--no-lock-index` to avoid lock contention with the interactive Git usage
of the actual human user.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

Documentation/git-status.txt

@@ -134,6 +134,13 @@ ignored, then the directory is not shown, but all contents are shown.
 	without options are equivalent to 'always' and 'never'
 	respectively.
 
+--no-lock-index::
+--lock-index::
+	(DEPRECATED: use --no-optional-locks instead)
+	Specifies whether `git status` should try to lock the index and
+	update it afterwards if any changes were detected. Defaults to
+	`--lock-index`.
+
 <pathspec>...::
 	See the 'pathspec' entry in linkgit:gitglossary[7].
 

builtin/commit.c

@@ -1364,6 +1364,7 @@ static int git_status_config(const char *k, const char *v, void *cb)
 
 int cmd_status(int argc, const char **argv, const char *prefix)
 {
+	static int no_lock_index = 0;
 	static struct wt_status s;
 	int fd;
 	struct object_id oid;
@@ -1397,12 +1398,20 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 		  N_("ignore changes to submodules, optional when: all, dirty, untracked. (Default: all)"),
 		  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
 		OPT_COLUMN(0, "column", &s.colopts, N_("list untracked files in columns")),
+		OPT_BOOL(0, "no-lock-index", &no_lock_index,
+			 N_("do not lock the index")),
 		OPT_END(),
 	};
 
 	if (argc == 2 && !strcmp(argv[1], "-h"))
 		usage_with_options(builtin_status_usage, builtin_status_options);
 
+	if (no_lock_index) {
+		warning("--no-lock-index is deprecated, use --no-optional-locks"
+			" instead");
+		setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "false", 1);
+	}
+
 	status_init_config(&s, git_status_config);
 	argc = parse_options(argc, argv, prefix,
 			     builtin_status_options,