Added wildcard label vaule option

README.md

@@ -199,6 +199,8 @@ metadata:
     test: true
   ...
 ```
+If you want to select namespace only by the key of the label use ```*``` as the value.
+For example, for ```--namespace-selector=select-this:*``` all namespaces with label-key "select-this" will be selected regardless of the labels value
 
 ### Vanilla kustomize
 

internal/pkg/controller/controller.go

@@ -104,30 +104,30 @@ func (c *Controller) resourceInNamespaceSelector(raw interface{}) bool {
 
 	switch object := raw.(type) {
 	case *v1.ConfigMap:
-		namespace, err := c.client.CoreV1().Namespaces().Get(context.Background(), object.ObjectMeta.Namespace, metav1.GetOptions{})
-		if err != nil {
-			logrus.Warn(err)
-			return false
-		}
-
-		for selectorKey, selectorVal := range c.namespaceSelector {
-			namespaceLabelVal, namespaceLabelKeyExists := namespace.ObjectMeta.Labels[selectorKey]
-			if !namespaceLabelKeyExists || selectorVal != namespaceLabelVal {
-				return false
-			}
-		}
+		return c.matchLabels(object.ObjectMeta.Namespace)
 	case *v1.Secret:
-		namespace, err := c.client.CoreV1().Namespaces().Get(context.Background(), object.ObjectMeta.Namespace, metav1.GetOptions{})
-		if err != nil {
-			logrus.Warn(err)
-			return false
+		return c.matchLabels(object.ObjectMeta.Namespace)
+	}
+	return true
+}
+
+func (c *Controller) matchLabels(resourceNamespace string) bool {
+	namespace, err := c.client.CoreV1().Namespaces().Get(context.Background(), resourceNamespace, metav1.GetOptions{})
+	if err != nil {
+		logrus.Warn(err)
+		return false
+	}
+
+	for selectorKey, selectorVal := range c.namespaceSelector {
+
+		namespaceLabelVal, namespaceLabelKeyExists := namespace.ObjectMeta.Labels[selectorKey]
+
+		if namespaceLabelKeyExists && selectorVal == "*" {
+			continue
 		}
 
-		for selectorKey, selectorVal := range c.namespaceSelector {
-			namespaceLabelVal, namespaceLabelKeyExists := namespace.ObjectMeta.Labels[selectorKey]
-			if !namespaceLabelKeyExists || selectorVal != namespaceLabelVal {
-				return false
-			}
+		if !namespaceLabelKeyExists || selectorVal != namespaceLabelVal {
+			return false
 		}
 	}
 	return true

internal/pkg/controller/controller_test.go

@@ -2381,6 +2381,25 @@ func TestController_resourceInNamespaceSelector(t *testing.T) {
 				raw: testutil.GetSecret("not-selected-namespace", "secret", "test"),
 			},
 			want: false,
+		}, {
+			name: "TestSecretResourceInNamespaceSelectorWiledcardValue",
+			fields: fields{
+				namespaceSelector: util.Map{
+					"select": "*",
+				},
+				namespace: v1.Namespace{
+					ObjectMeta: metav1.ObjectMeta{
+						Name: "selected-namespace",
+						Labels: map[string]string{
+							"select": "this",
+						},
+					},
+				},
+			},
+			args: args{
+				raw: testutil.GetSecret("selected-namespace", "secret", "test"),
+			},
+			want: true,
 		},
 	}