Function submodule_needs_pushing

submodule.c:1036–1080

}

static int submodule_needs_pushing(struct repository *r,
				   const char *path,
				   struct oid_array *commits)
{
	if (!submodule_has_commits(r, path, null_oid(the_hash_algo), commits))
		/*
		 * NOTE: We do consider it safe to return "no" here. The
		 * correct answer would be "We do not know" instead of
		 * "No push needed", but it is quite hard to change
		 * the submodule pointer without having the submodule
		 * around. If a user did however change the submodules
		 * without having the submodule around, this indicates
		 * an expert who knows what they are doing or a
		 * maintainer integrating work from other people. In
		 * both cases it should be safe to skip this check.
		 */
		return 0;

	if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
		struct child_process cp = CHILD_PROCESS_INIT;
		struct strbuf buf = STRBUF_INIT;
		int needs_pushing = 0;

		strvec_push(&cp.args, "rev-list");
		oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
		strvec_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);

		prepare_submodule_repo_env(&cp.env);
		cp.git_cmd = 1;
		cp.no_stdin = 1;
		cp.out = -1;
		cp.dir = path;
		if (start_command(&cp))
			die(_("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s"),
					path);
		if (strbuf_read(&buf, cp.out, the_hash_algo->hexsz + 1))
			needs_pushing = 1;
		finish_command(&cp);
		close(cp.out);
		strbuf_release(&buf);
		return needs_pushing;
	}

	return 0;
}

int find_unpushed_submodules(struct repository *r,
			     struct oid_array *commits,