Add replication controller status subresource

pkg/api/validation/validation_test.go

@@ -2101,6 +2101,89 @@ func TestValidateService(t *testing.T) {
 	}
 }
 
+func TestValidateReplicationControllerStatusUpdate(t *testing.T) {
+	validSelector := map[string]string{"a": "b"}
+	validPodTemplate := api.PodTemplate{
+		Template: api.PodTemplateSpec{
+			ObjectMeta: api.ObjectMeta{
+				Labels: validSelector,
+			},
+			Spec: api.PodSpec{
+				RestartPolicy: api.RestartPolicyAlways,
+				DNSPolicy:     api.DNSClusterFirst,
+				Containers:    []api.Container{{Name: "abc", Image: "image", ImagePullPolicy: "IfNotPresent"}},
+			},
+		},
+	}
+	type rcUpdateTest struct {
+		old    api.ReplicationController
+		update api.ReplicationController
+	}
+	successCases := []rcUpdateTest{
+		{
+			old: api.ReplicationController{
+				ObjectMeta: api.ObjectMeta{Name: "abc", Namespace: api.NamespaceDefault},
+				Spec: api.ReplicationControllerSpec{
+					Selector: validSelector,
+					Template: &validPodTemplate.Template,
+				},
+				Status: api.ReplicationControllerStatus{
+					Replicas: 2,
+				},
+			},
+			update: api.ReplicationController{
+				ObjectMeta: api.ObjectMeta{Name: "abc", Namespace: api.NamespaceDefault},
+				Spec: api.ReplicationControllerSpec{
+					Replicas: 3,
+					Selector: validSelector,
+					Template: &validPodTemplate.Template,
+				},
+				Status: api.ReplicationControllerStatus{
+					Replicas: 4,
+				},
+			},
+		},
+	}
+	for _, successCase := range successCases {
+		successCase.old.ObjectMeta.ResourceVersion = "1"
+		successCase.update.ObjectMeta.ResourceVersion = "1"
+		if errs := ValidateReplicationControllerStatusUpdate(&successCase.old, &successCase.update); len(errs) != 0 {
+			t.Errorf("expected success: %v", errs)
+		}
+	}
+	errorCases := map[string]rcUpdateTest{
+		"negative replicas": {
+			old: api.ReplicationController{
+				ObjectMeta: api.ObjectMeta{Name: "", Namespace: api.NamespaceDefault},
+				Spec: api.ReplicationControllerSpec{
+					Selector: validSelector,
+					Template: &validPodTemplate.Template,
+				},
+				Status: api.ReplicationControllerStatus{
+					Replicas: 3,
+				},
+			},
+			update: api.ReplicationController{
+				ObjectMeta: api.ObjectMeta{Name: "abc", Namespace: api.NamespaceDefault},
+				Spec: api.ReplicationControllerSpec{
+					Replicas: 2,
+					Selector: validSelector,
+					Template: &validPodTemplate.Template,
+				},
+				Status: api.ReplicationControllerStatus{
+					Replicas: -3,
+				},
+			},
+		},
+	}
+	for testName, errorCase := range errorCases {
+		if errs := ValidateReplicationControllerStatusUpdate(&errorCase.old, &errorCase.update); len(errs) == 0 {
+			t.Errorf("expected failure: %s", testName)
+		}
+	}
+
+}
+
 func TestValidateReplicationControllerUpdate(t *testing.T) {
 	validSelector := map[string]string{"a": "b"}
 	validPodTemplate := api.PodTemplate{
@@ -2475,7 +2558,8 @@ func TestValidateReplicationController(t *testing.T) {
 				field != "spec.replicas" &&
 				field != "spec.template.labels" &&
 				field != "metadata.annotations" &&
-				field != "metadata.labels" {
+				field != "metadata.labels" &&
+				field != "status.replicas" {
 				t.Errorf("%s: missing prefix for: %v", k, errs[i])
 			}
 		}