Function ref_transaction_update

refs.c:1390–1454

}

enum ref_transaction_error ref_transaction_update(struct ref_transaction *transaction,
						  const char *refname,
						  const struct object_id *new_oid,
						  const struct object_id *old_oid,
						  const char *new_target,
						  const char *old_target,
						  unsigned int flags, const char *msg,
						  struct strbuf *err)
{
	struct object_id peeled;

	assert(err);

	if ((flags & REF_FORCE_CREATE_REFLOG) &&
	    (flags & REF_SKIP_CREATE_REFLOG)) {
		strbuf_addstr(err, _("refusing to force and skip creation of reflog"));
		return REF_TRANSACTION_ERROR_GENERIC;
	}

	if (!transaction_refname_valid(refname, new_oid, flags, err))
		return REF_TRANSACTION_ERROR_GENERIC;

	if (flags & ~REF_TRANSACTION_UPDATE_ALLOWED_FLAGS)
		BUG("illegal flags 0x%x passed to ref_transaction_update()", flags);

	/*
	 * Clear flags outside the allowed set; this should be a noop because
	 * of the BUG() check above, but it works around a -Wnonnull warning
	 * with some versions of "gcc -O3".
	 */
	flags &= REF_TRANSACTION_UPDATE_ALLOWED_FLAGS;

	flags |= (new_oid ? REF_HAVE_NEW : 0) | (old_oid ? REF_HAVE_OLD : 0);
	flags |= (new_target ? REF_HAVE_NEW : 0) | (old_target ? REF_HAVE_OLD : 0);

	if ((flags & REF_HAVE_NEW) && !new_target && !is_null_oid(new_oid) &&
	    !(flags & REF_SKIP_OID_VERIFICATION) && !(flags & REF_LOG_ONLY)) {
		struct object *o = parse_object(transaction->ref_store->repo, new_oid);

		if (!o) {
			strbuf_addf(err,
				    _("trying to write ref '%s' with nonexistent object %s"),
				    refname, oid_to_hex(new_oid));
			return REF_TRANSACTION_ERROR_INVALID_NEW_VALUE;
		}

		if (o->type != OBJ_COMMIT && is_branch(refname)) {
			strbuf_addf(err, _("trying to write non-commit object %s to branch '%s'"),
				    oid_to_hex(new_oid), refname);
			return REF_TRANSACTION_ERROR_INVALID_NEW_VALUE;
		}

		if (o->type == OBJ_TAG) {
			if (!peel_object(transaction->ref_store->repo, new_oid, &peeled,
					 PEEL_OBJECT_VERIFY_TAGGED_OBJECT_TYPE))
				flags |= REF_HAVE_PEELED;
		}
	}