Function add_submodule

builtin/submodule--helper.c:3404–3501

}

static int add_submodule(const struct add_data *add_data)
{
	struct module_clone_data clone_data = MODULE_CLONE_DATA_INIT;
	struct string_list reference = STRING_LIST_INIT_NODUP;
	int ret = -1;

	/* perhaps the path already exists and is already a git repo, else clone it */
	if (is_directory(add_data->sm_path)) {
		char *submod_gitdir_path;
		struct strbuf sm_path = STRBUF_INIT;
		strbuf_addstr(&sm_path, add_data->sm_path);
		submod_gitdir_path = xstrfmt("%s/.git", add_data->sm_path);
		if (is_nonbare_repository_dir(&sm_path))
			printf(_("Adding existing repo at '%s' to the index\n"),
			       add_data->sm_path);
		else
			die(_("'%s' already exists and is not a valid git repo"),
			    add_data->sm_path);
		strbuf_release(&sm_path);
		free(submod_gitdir_path);
	} else {
		struct child_process cp = CHILD_PROCESS_INIT;
		struct strbuf submod_gitdir = STRBUF_INIT;

		submodule_name_to_gitdir(&submod_gitdir, the_repository, add_data->sm_name);

		if (is_directory(submod_gitdir.buf)) {
			if (!add_data->force) {
				struct strbuf msg = STRBUF_INIT;
				char *die_msg;

				strbuf_addf(&msg, _("A git directory for '%s' is found "
						    "locally with remote(s):\n"),
					    add_data->sm_name);

				append_fetch_remotes(&msg, submod_gitdir.buf);
				strbuf_release(&submod_gitdir);

				strbuf_addf(&msg, _("If you want to reuse this local git "
						    "directory instead of cloning again from\n"
						    "  %s\n"
						    "use the '--force' option. If the local git "
						    "directory is not the correct repo\n"
						    "or you are unsure what this means choose "
						    "another name with the '--name' option."),
					    add_data->realrepo);

				die_msg = strbuf_detach(&msg, NULL);
				die("%s", die_msg);
			} else {
				printf(_("Reactivating local git directory for "
					 "submodule '%s'\n"), add_data->sm_name);
			}
		}
		strbuf_release(&submod_gitdir);

		clone_data.prefix = add_data->prefix;
		clone_data.path = add_data->sm_path;