Fix node-disruption-types containing empty strings

Split was containing empty string. Now we filter them out
to avoid rejecting maintenances.

cmd/main.go

@@ -57,7 +57,7 @@ func main() {
 	var rejectEmptyNodeDisruption bool
 	var retryInterval time.Duration
 	var rejectOverlappingDisruption bool
-	var nodeDisruptionTypes string
+	var nodeDisruptionTypesRaw string
 	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
 	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
@@ -66,7 +66,7 @@ func main() {
 	flag.BoolVar(&rejectEmptyNodeDisruption, "reject-empty-node-disruption", false, "Reject NodeDisruption matching no actual node.")
 	flag.DurationVar(&retryInterval, "retry-interval", controller.DefaultRetryInterval, "How long to wait between each retry (Default 60s)")
 	flag.BoolVar(&rejectOverlappingDisruption, "reject-overlapping-disruption", false, "Automatically reject any overlapping NodeDisruption (based on node selector), preserving the oldest one")
-	flag.StringVar(&nodeDisruptionTypes, "node-disruption-types", "", "The list of types allowed for a node disruption separated by a comma.")
+	flag.StringVar(&nodeDisruptionTypesRaw, "node-disruption-types", "", "The list of types allowed for a node disruption separated by a comma.")
 
 	opts := zap.Options{
 		Development: true,
@@ -100,14 +100,16 @@ func main() {
 		os.Exit(1)
 	}
 
+	nodeDisruptionTypes := strings.FieldsFunc(nodeDisruptionTypesRaw, func(c rune) bool { return c == ',' })
+
 	if err = (&controller.NodeDisruptionReconciler{
 		Client: mgr.GetClient(),
 		Scheme: mgr.GetScheme(),
 		Config: controller.NodeDisruptionReconcilerConfig{
 			RejectEmptyNodeDisruption:   rejectEmptyNodeDisruption,
 			RetryInterval:               retryInterval,
 			RejectOverlappingDisruption: rejectOverlappingDisruption,
-			NodeDisruptionTypes:         strings.Split(nodeDisruptionTypes, ","),
+			NodeDisruptionTypes:         nodeDisruptionTypes,
 		},
 	}).SetupWithManager(mgr); err != nil {
 		setupLog.Error(err, "unable to create controller", "controller", "NodeDisruption")