Prompt to install CRD when Kind no found

Author: interma

Gopkg.lock

@@ -20,6 +20,7 @@ required = ["sigs.k8s.io/testing_frameworks/integration",
             "github.com/go-openapi/spec",
             "k8s.io/kube-openapi/pkg/common",
             "k8s.io/apiextensions-apiserver",
+            "github.com/pkg/errors",
             ]
 
 [[constraint]]

Gopkg.toml

@@ -20,6 +20,9 @@ import (
 	"fmt"
 	"sync"
 
+	"github.com/pkg/errors"
+
+	"k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/util/workqueue"
 	"sigs.k8s.io/controller-runtime/pkg/event"
@@ -62,6 +65,7 @@ type Kind struct {
 
 var _ Source = &Kind{}
 
+
 // Start is internal and should be called only by the Controller to register an EventHandler with the Informer
 // to enqueue reconcile.Requests.
 func (ks *Kind) Start(handler handler.EventHandler, queue workqueue.RateLimitingInterface,
@@ -80,7 +84,13 @@ 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 errors.Wrapf(err, "if %s is a CRD, should install it before calling Start",
+				err.(*meta.NoKindMatchError).GroupKind)
+		default:
+			return err
+		}
 	}
 	i.AddEventHandler(internal.EventHandler{Queue: queue, EventHandler: handler, Predicates: prct})
 	return nil