Prompt to install CRD when Kind no found

Author: interma

pkg/source/source.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"sync"
 
+	"k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/util/workqueue"
 	"sigs.k8s.io/controller-runtime/pkg/event"
@@ -80,7 +81,12 @@ func (ks *Kind) Start(handler handler.EventHandler, queue workqueue.RateLimiting
 	// Lookup the Informer from the Cache and add an EventHandler which populates the Queue
 	i, err := ks.cache.GetInformer(ks.Type)
 	if err != nil {
-		return err
+		switch err.(type) {
+		case *meta.NoKindMatchError:
+			return fmt.Errorf("must install CRD %s before calling Start", err.(*meta.NoKindMatchError).GroupKind)
+		default:
+			return err
+		}
 	}
 	i.AddEventHandler(internal.EventHandler{Queue: queue, EventHandler: handler, Predicates: prct})
 	return nil