Add kubectl rollout status

pkg/kubectl/rollout_status.go

@@ -0,0 +1,57 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kubectl
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api/unversioned"
+	"k8s.io/kubernetes/pkg/apis/extensions"
+	client "k8s.io/kubernetes/pkg/client/unversioned"
+)
+
+// StatusViewer provides an interface for resources that provides rollout status.
+type StatusViewer interface {
+	Status(namespace, name string) (string, bool, error)
+}
+
+func StatusViewerFor(kind unversioned.GroupKind, c client.Interface) (StatusViewer, error) {
+	switch kind {
+	case extensions.Kind("Deployment"):
+		return &DeploymentStatusViewer{c.Extensions()}, nil
+	}
+	return nil, fmt.Errorf("no status viewer has been implemented for %v", kind)
+}
+
+type DeploymentStatusViewer struct {
+	c client.ExtensionsInterface
+}
+
+// Status returns a message describing deployment status, and a bool value indicating if the status is considered done
+func (s *DeploymentStatusViewer) Status(namespace, name string) (string, bool, error) {
+	deployment, err := s.c.Deployments(namespace).Get(name)
+	if err != nil {
+		return "", false, err
+	}
+	if deployment.Generation <= deployment.Status.ObservedGeneration {
+		if deployment.Status.UpdatedReplicas == deployment.Spec.Replicas {
+			return fmt.Sprintf("deployment %s successfully rolled out\n", name), true, nil
+		}
+		return fmt.Sprintf("Waiting for rollout to finish: %d out of %d new replicas have been updated...\n", deployment.Status.UpdatedReplicas, deployment.Spec.Replicas), false, nil
+	}
+	return fmt.Sprintf("Waiting for deployment spec update to be observed...\n"), false, nil
+}