Add Label Selector to available parameters (#71)

* Add label-selector flag

* Add labelSelector to job and pod filter

* Update README.md

Author: RocketRaccoon

README.md

@@ -136,6 +136,8 @@ Usage of ./bin/kube-cleanup-operator:
         Limit scope to a single namespace
   -run-outside-cluster
         Set this flag when running outside of the cluster.
+  -label-selector
+        Delete only jobs and pods that meet label selector requirements. #See https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
 ```
 
 ### Optional parameters 

cmd/main.go

@@ -58,6 +58,9 @@ func main() {
 	legacyMode := flag.Bool("legacy-mode", true, "Legacy mode: `true` - use old `keep-*` flags, `false` - enable new `delete-*-after` flags")
 
 	dryRun := flag.Bool("dry-run", false, "Print only, do not delete anything.")
+	
+	labelSelector := flag.String("label-selector", "", "Delete only jobs and pods that meet label selector requirements")
+	
 	flag.Parse()
 	setupLogging()
 
@@ -77,6 +80,8 @@ func main() {
 	optsInfo.WriteString(fmt.Sprintf("\tkeep-successful: %d\n", *legacyKeepSuccessHours))
 	optsInfo.WriteString(fmt.Sprintf("\tkeep-failures: %d\n", *legacyKeepFailedHours))
 	optsInfo.WriteString(fmt.Sprintf("\tkeep-pending: %d\n", *legacyKeepPendingHours))
+	
+	optsInfo.WriteString(fmt.Sprintf("\tlabel-selector: %s\n", *labelSelector))
 	log.Println(optsInfo.String())
 
 	if *legacyMode {
@@ -129,6 +134,7 @@ func main() {
 				*deleteOrphanedAfter,
 				*deleteEvictedAfter,
 				*ignoreOwnedByCronjob,
+				*labelSelector,
 				stopCh,
 			).Run()
 		}

pkg/controller/controller.go

@@ -51,6 +51,8 @@ type Kleaner struct {
 	deleteEvictedAfter    time.Duration
 
 	ignoreOwnedByCronjob bool
+	
+	labelSelector        string
 
 	dryRun bool
 	ctx    context.Context
@@ -60,13 +62,16 @@ type Kleaner struct {
 // NewKleaner creates a new NewKleaner
 func NewKleaner(ctx context.Context, kclient *kubernetes.Clientset, namespace string, dryRun bool, deleteSuccessfulAfter,
 	deleteFailedAfter, deletePendingAfter, deleteOrphanedAfter, deleteEvictedAfter time.Duration, ignoreOwnedByCronjob bool,
+	labelSelector string,
 	stopCh <-chan struct{}) *Kleaner {
 	jobInformer := cache.NewSharedIndexInformer(
 		&cache.ListWatch{
 			ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
+				options.LabelSelector = labelSelector
 				return kclient.BatchV1().Jobs(namespace).List(ctx, options)
 			},
 			WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
+				options.LabelSelector = labelSelector
 				return kclient.BatchV1().Jobs(namespace).Watch(ctx, options)
 			},
 		},
@@ -78,9 +83,11 @@ func NewKleaner(ctx context.Context, kclient *kubernetes.Clientset, namespace st
 	podInformer := cache.NewSharedIndexInformer(
 		&cache.ListWatch{
 			ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
+				options.LabelSelector = labelSelector
 				return kclient.CoreV1().Pods(namespace).List(ctx, options)
 			},
 			WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
+				options.LabelSelector = labelSelector
 				return kclient.CoreV1().Pods(namespace).Watch(ctx, options)
 			},
 		},
@@ -99,6 +106,7 @@ func NewKleaner(ctx context.Context, kclient *kubernetes.Clientset, namespace st
 		deleteOrphanedAfter:   deleteOrphanedAfter,
 		deleteEvictedAfter:    deleteEvictedAfter,
 		ignoreOwnedByCronjob:  ignoreOwnedByCronjob,
+		labelSelector:         labelSelector,
 	}
 	jobInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
 		UpdateFunc: func(old, new interface{}) {