do not attempt restore resource with no available GVK in cluster

Signed-off-by: Tiger Kaovilai <tkaovila@redhat.com>

pkg/restore/restore.go

@@ -1063,6 +1063,16 @@ func (ctx *restoreContext) getResourceClient(groupResource schema.GroupResource,
 
 // if new informer is created, non-nil factory is returned
 func (ctx *restoreContext) getGenericInformerInternal(groupResource schema.GroupResource, version, namespace string) (informers.GenericInformer, *informerFactoryWithContext) {
+	_, _, err := ctx.discoveryHelper.KindFor(schema.GroupVersionKind{
+		Group:   groupResource.Group,
+		Version: version,
+		Kind:    groupResource.Resource,
+	})
+	clusterHasKind := err == nil
+	if !clusterHasKind  {
+		ctx.log.Errorf("Cannot get informer factory %s because GVK doesn't exist in the cluster", groupResource)
+		return nil, nil
+	}
 	var returnFactory *informerFactoryWithContext
 
 	key := getResourceClientKey(groupResource, version, namespace)
@@ -1097,6 +1107,9 @@ func (ctx *restoreContext) getGenericInformer(groupResource schema.GroupResource
 }
 func (ctx *restoreContext) getResourceLister(groupResource schema.GroupResource, obj *unstructured.Unstructured, namespace string) cache.GenericNamespaceLister {
 	informer := ctx.getGenericInformer(groupResource, obj.GroupVersionKind().Version, namespace)
+	if informer == nil {
+		return nil
+	}
 	if namespace == "" {
 		return informer.Lister()
 	} else {
@@ -1114,6 +1127,9 @@ func getResourceID(groupResource schema.GroupResource, namespace, name string) s
 
 func (ctx *restoreContext) getResource(groupResource schema.GroupResource, obj *unstructured.Unstructured, namespace, name string) (*unstructured.Unstructured, error) {
 	lister := ctx.getResourceLister(groupResource, obj, namespace)
+	if lister == nil {
+		return nil, errors.Errorf("Error getting lister for %s because no informer for GVK found", getResourceID(groupResource, namespace, name))
+	}
 	clusterObj, err := lister.Get(name)
 	if err != nil {
 		return nil, errors.Wrapf(err, "error getting resource from lister for %s, %s/%s", groupResource, namespace, name)