diff -Nru PackageKit-1.1.12.orig/backends/dnf/Makefile.am PackageKit-1.1.12/backends/dnf/Makefile.am
--- PackageKit-1.1.12.orig/backends/dnf/Makefile.am	2018-10-02 10:48:01.000000000 +0200
+++ PackageKit-1.1.12/backends/dnf/Makefile.am	2019-06-02 14:29:17.819392100 +0200
@@ -3,7 +3,8 @@
 EXTRA_DIST =								\
 	dnf-backend-vendor-fedora.c					\
 	dnf-backend-vendor-mageia.c					\
-	dnf-backend-vendor-openmandriva.c
+	dnf-backend-vendor-openmandriva.c				\
+	dnf-backend-vendor-openmamba.c
 libpk_backend_dnf_la_SOURCES =						\
 	dnf-backend-vendor.h						\
 	dnf-backend.c							\
diff -Nru PackageKit-1.1.12.orig/backends/dnf/Makefile.in PackageKit-1.1.12/backends/dnf/Makefile.in
--- PackageKit-1.1.12.orig/backends/dnf/Makefile.in	2018-11-28 09:00:22.000000000 +0100
+++ PackageKit-1.1.12/backends/dnf/Makefile.in	2019-06-02 14:29:39.412510430 +0200
@@ -482,7 +482,8 @@
 EXTRA_DIST = \
 	dnf-backend-vendor-fedora.c					\
 	dnf-backend-vendor-mageia.c					\
-	dnf-backend-vendor-openmandriva.c
+	dnf-backend-vendor-openmandriva.c				\
+	dnf-backend-vendor-openmamba.c
 
 libpk_backend_dnf_la_SOURCES = \
 	dnf-backend-vendor.h						\
diff -Nru PackageKit-1.1.12.orig/configure PackageKit-1.1.12/configure
--- PackageKit-1.1.12.orig/configure	2018-11-28 09:00:21.000000000 +0100
+++ PackageKit-1.1.12/configure	2019-06-02 14:31:03.464965583 +0200
@@ -1783,7 +1783,7 @@
                           where D-BUS system-services directory is
   --with-dnf-vendor=<vendor>
                           select a vendor configuration (fedora, mageia,
-                          openmandriva; default is fedora)
+                          openmandriva, openmamba; default is fedora)
 
 Some influential environment variables:
   PKG_CONFIG  path to pkg-config utility
@@ -22243,7 +22243,7 @@
   withval=$with_dnf_vendor;
 fi
 
-	if test "$with_dnf_vendor" = "fedora" -o "$with_dnf_vendor" = "mageia" -o "$with_dnf_vendor" = "openmandriva"; then
+	if test "$with_dnf_vendor" = "fedora" -o "$with_dnf_vendor" = "mageia" -o "$with_dnf_vendor" = "openmandriva" -o "$with_dnf_vendor" = "openmamba"; then
 		with_dnf_vendor="$with_dnf_vendor"
 	else
 		with_dnf_vendor="fedora"
diff -Nru PackageKit-1.1.12.orig/configure.ac PackageKit-1.1.12/configure.ac
--- PackageKit-1.1.12.orig/configure.ac	2018-11-24 09:40:55.000000000 +0100
+++ PackageKit-1.1.12/configure.ac	2019-06-02 14:30:31.679794436 +0200
@@ -394,8 +394,8 @@
 if test x$enable_dnf = xyes; then
 	PKG_CHECK_MODULES(DNF, appstream-glib libdnf >= 0.22.0 rpm)
 	AC_ARG_WITH(dnf-vendor,
-			[AS_HELP_STRING([--with-dnf-vendor=<vendor>],[select a vendor configuration (fedora, mageia, openmandriva; default is fedora)])])
-	if test "$with_dnf_vendor" = "fedora" -o "$with_dnf_vendor" = "mageia" -o "$with_dnf_vendor" = "openmandriva"; then
+			[AS_HELP_STRING([--with-dnf-vendor=<vendor>],[select a vendor configuration (fedora, mageia, openmandriva, openmamba; default is fedora)])])
+	if test "$with_dnf_vendor" = "fedora" -o "$with_dnf_vendor" = "mageia" -o "$with_dnf_vendor" = "openmandriva" -o "$with_dnf_vendor" = "openmamba"; then
 		with_dnf_vendor="$with_dnf_vendor"
 	else
 		with_dnf_vendor="fedora"
--- /dev/null	2019-03-18 22:35:13.859000000 +0100
+++ PackageKit-1.1.12/backends/dnf/dnf-backend-vendor-openmamba.c	2019-06-04 18:34:35.213036497 +0200
@@ -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;
+}