(feat) requeue the csv when subscription changes

When a subscription changes, if it has an installed CSV then requeue
it so that any changes in pod configuration can take effect
immediately.

Author: tkashem

pkg/controller/operators/olm/operator.go

@@ -453,12 +453,21 @@ func (a *Operator) now() metav1.Time {
 }
 
 func (a *Operator) syncSubscription(obj interface{}) error {
-	_, ok := obj.(*v1alpha1.Subscription)
+	sub, ok := obj.(*v1alpha1.Subscription)
 	if !ok {
 		a.logger.Debugf("wrong type: %#v\n", obj)
 		return fmt.Errorf("casting Subscription failed")
 	}
 
+	installedCSV := sub.Status.InstalledCSV
+	if installedCSV != "" {
+		a.logger.WithField("csv", installedCSV).Debug("subscription has changed, requeuing installed csv")
+		if err := a.csvQueueSet.Requeue(sub.GetNamespace(), installedCSV); err != nil {
+			a.logger.WithField("csv", installedCSV).Debug("failed to requeue installed csv")
+			return err
+		}
+	}
+
 	return nil
 }