diff -Nru PackageKit-1.1.13.orig/backends/dnf/dnf-backend-vendor-openmamba.c PackageKit-1.1.13/backends/dnf/dnf-backend-vendor-openmamba.c
--- PackageKit-1.1.13.orig/backends/dnf/dnf-backend-vendor-openmamba.c	1970-01-01 01:00:00.000000000 +0100
+++ PackageKit-1.1.13/backends/dnf/dnf-backend-vendor-openmamba.c	2020-01-08 16:42:42.017000000 +0100
@@ -0,0 +1,43 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2016 Neal Gompa <ngompa13@gmail.com>
+ * Copyright (C) 2018 Kalev Lember <klember@redhat.com>
+ *
+ * Licensed under the GNU Lesser General Public License Version 2.1
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include "dnf-backend-vendor.h"
+
+gboolean
+dnf_validate_supported_repo (const gchar *id)
+{
+	const gchar *default_repos[] = { "rolling",
+	                                 "rolling-games",
+	                                 "rolling-i586",
+	                                 "rolling-games-i586",
+	                                 "unstable-makedist",
+	                                 "unstable-makedist-i586",
+	                                 NULL };
+
+	/* core repos that users shouldn't play with */
+	for (guint i = 0; default_repos[i] != NULL; i++) {
+		if (g_strcmp0 (id, default_repos[i]) == 0)
+			return TRUE;
+	}
+
+	return FALSE;
+}