Function refs_verify_refnames_available

refs.c:2775–2937

}

enum ref_transaction_error refs_verify_refnames_available(struct ref_store *refs,
					  const struct string_list *refnames,
					  const struct string_list *extras,
					  const struct string_list *skip,
					  struct ref_transaction *transaction,
					  unsigned int initial_transaction,
					  struct strbuf *err)
{
	struct strbuf dirname = STRBUF_INIT;
	struct strbuf referent = STRBUF_INIT;
	struct string_list_item *item;
	struct ref_iterator *iter = NULL;
	struct strset conflicting_dirnames;
	struct strset dirnames;
	int ret = REF_TRANSACTION_ERROR_NAME_CONFLICT;

	/*
	 * For the sake of comments in this function, suppose that
	 * refname is "refs/foo/bar".
	 */

	assert(err);

	strset_init(&conflicting_dirnames);
	strset_init(&dirnames);

	for_each_string_list_item(item, refnames) {
		const size_t *update_idx = (size_t *)item->util;
		const char *refname = item->string;
		const char *extra_refname;
		struct object_id oid;
		unsigned int type;
		const char *slash;

		strbuf_reset(&dirname);

		for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
			/*
			 * Just saying "Is a directory" when we e.g. can't
			 * lock some multi-level ref isn't very informative,
			 * the user won't be told *what* is a directory, so
			 * let's not use strerror() below.
			 */
			int ignore_errno;

			/* Expand dirname to the new prefix, not including the trailing slash: */
			strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len);

			/*
			 * We are still at a leading dir of the refname (e.g.,
			 * "refs/foo"; if there is a reference with that name,
			 * it is a conflict, *unless* it is in skip.
			 */
			if (skip && string_list_has_string(skip, dirname.buf))
				continue;

			/*
			 * If we've already seen the directory we don't need to