Re: [PATCH v4 1/3] fetch/pull: Add the --recurse-submodules option

Until now you had to call "git submodule update" (without -N|--no-fetch
option) or something like "git submodule foreach git fetch" to fetch
new commits in populated submodules from their remote.
...

diff --git a/builtin/fetch.c b/builtin/fetch.c
index d35f000..db3fba3 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c

...

@@ -784,28 +790,36 @@ static int add_remote_or_group(const char *name, struct string_list *list)
 	return 1;
 }

-static int fetch_multiple(struct string_list *list)
+static void add_options_to_argv(int *argc, const char **argv)
 {
-	int i, result = 0;
-	const char *argv[11] = { "fetch", "--append" };
-...
+static int fetch_multiple(struct string_list *list)
+{
+	int i, result = 0;
+	const char *argv[12] = { "fetch", "--append" };

diff --git a/submodule.c b/submodule.c
index 91a4758..4d9b774 100644
--- a/submodule.c
+++ b/submodule.c

@@ -63,7 +63,7 @@ void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 	}
 }

-static int submodule_config(const char *var, const char *value, void *cb)
+int submodule_config(const char *var, const char *value, void *cb)
 {
 	if (!prefixcmp(var, "submodule."))
 		return parse_submodule_config_option(var, value);

@@ -229,6 +229,70 @@ void show_submodule_summary(FILE *f, const char *path,
 	strbuf_release(&sb);
 }

+int fetch_populated_submodules(int num_options, const char **options,
+			       const char *prefix, int quiet)
+{
+	int i, result = 0, argc = 0;
+	struct child_process cp;
+	const char **argv;
+	struct string_list_item *name_for_path;
+	const char *work_tree = get_git_work_tree();
+	if (!work_tree)
+		return 0;
+
+	if (!the_index.initialized)
+		if (read_cache() < 0)
+			die("index file corrupt");
+
+	argv = xcalloc(num_options + 5, sizeof(const char *));