registry/reconciler: allow current pods to be not ready

A good chunk of this logic is fatally flawed - it would be much more
simple to manage a Deployment and use server-side apply to ensure that
the current server state always matched the desired state, but that
would be a large refactor and who knows how many other things are
loosely coupled here. This is the smallest change that allows for the
current serving pod to not yet have a running catalog server.

Signed-off-by: Steve Kuznetsov <[email protected]>

Author: stevekuznetsov

pkg/controller/registry/reconciler/grpc.go

@@ -437,11 +437,15 @@ func (c *GrpcRegistryReconciler) createUpdatePod(source grpcCatalogSourceDecorat
 func imageChanged(updatePod *corev1.Pod, servingPods []*corev1.Pod) bool {
 	updatedCatalogSourcePodImageID := imageID(updatePod)
 	if updatedCatalogSourcePodImageID == "" {
-		logrus.WithField("CatalogSource", updatePod.GetName()).Warn("pod status unknown, cannot get the pod's imageID")
+		logrus.WithField("CatalogSource", updatePod.GetName()).Warn("pod status unknown, cannot get the updated pod's imageID")
 		return false
 	}
 	for _, servingPod := range servingPods {
 		servingCatalogSourcePodImageID := imageID(servingPod)
+		if servingCatalogSourcePodImageID == "" {
+			logrus.WithField("CatalogSource", servingPod.GetName()).Warn("pod status unknown, cannot get the current pod's imageID")
+			return false
+		}
 		if updatedCatalogSourcePodImageID != servingCatalogSourcePodImageID {
 			logrus.WithField("CatalogSource", servingPod.GetName()).Infof("catalog image changed: serving pod %s update pod %s", servingCatalogSourcePodImageID, updatedCatalogSourcePodImageID)
 			return true