Function validate_no_submodules

builtin/worktree.c:1203–1243

}

static void validate_no_submodules(const struct worktree *wt)
{
	struct index_state istate = INDEX_STATE_INIT(the_repository);
	struct strbuf path = STRBUF_INIT;
	int i, found_submodules = 0;
	char *wt_gitdir;

	wt_gitdir = get_worktree_git_dir(wt);

	if (is_directory(worktree_git_path(wt, "modules"))) {
		/*
		 * There could be false positives, e.g. the "modules"
		 * directory exists but is empty. But it's a rare case and
		 * this simpler check is probably good enough for now.
		 */
		found_submodules = 1;
	} else if (read_index_from(&istate, worktree_git_path(wt, "index"),
				   wt_gitdir) > 0) {
		for (i = 0; i < istate.cache_nr; i++) {
			struct cache_entry *ce = istate.cache[i];
			int err;

			if (!S_ISGITLINK(ce->ce_mode))
				continue;

			strbuf_reset(&path);
			strbuf_addf(&path, "%s/%s", wt->path, ce->name);
			if (!is_submodule_populated_gently(path.buf, &err))
				continue;

			found_submodules = 1;
			break;
		}
	}
	discard_index(&istate);
	strbuf_release(&path);
	free(wt_gitdir);

	if (found_submodules)
		die(_("working trees containing submodules cannot be moved or removed"));
}

static int move_worktree(int ac, const char **av, const char *prefix,
			 struct repository *repo UNUSED)