Function parse_cmd_update

builtin/update-ref.c:304–340

 */

static void parse_cmd_update(struct ref_transaction *transaction,
			     const char *next, const char *end,
			     struct command_options *opts)
{
	struct strbuf err = STRBUF_INIT;
	char *refname;
	struct object_id new_oid, old_oid;
	enum ref_transaction_error tx_err;
	int have_old;

	refname = parse_refname(&next);
	if (!refname)
		die("update: missing <ref>");

	if (parse_next_oid(&next, end, &new_oid, "update", refname,
			   PARSE_SHA1_ALLOW_EMPTY))
		die("update %s: missing <new-oid>", refname);

	have_old = !parse_next_oid(&next, end, &old_oid, "update", refname,
				   PARSE_SHA1_OLD);

	if (*next != line_termination)
		die("update %s: extra input: %s", refname, next);

	tx_err = ref_transaction_update(transaction, refname,
					&new_oid, have_old ? &old_oid : NULL,
					NULL, NULL,
					update_flags | create_reflog_flag,
					msg, &err);
	handle_ref_transaction_error(refname, &new_oid, have_old ? &old_oid : NULL,
				     NULL, NULL, tx_err, &err, opts);


	update_flags = default_flags;
	free(refname);
	strbuf_release(&err);
}

static void parse_cmd_symref_update(struct ref_transaction *transaction,
				    const char *next, const char *end UNUSED,