exec support init container

Author: adohe

docs/user-guide/kubectl/kubectl_exec.md

@@ -100,7 +100,7 @@ kubectl exec 123456-7890 -c ruby-container -i -t -- bash -il
 
 * [kubectl](kubectl.md)	 - kubectl controls the Kubernetes cluster manager
 
-###### Auto generated by spf13/cobra on 5-Apr-2016
+###### Auto generated by spf13/cobra on 3-Jun-2016
 
 <!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
 [![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/docs/user-guide/kubectl/kubectl_exec.md?pixel)]()

pkg/kubectl/cmd/exec.go

@@ -174,10 +174,6 @@ func (p *ExecOptions) Run() error {
 		return err
 	}
 
-	if pod.Status.Phase != api.PodRunning {
-		return fmt.Errorf("pod %s is not running and cannot execute commands; current phase is %s", p.PodName, pod.Status.Phase)
-	}
-
 	containerName := p.ContainerName
 	if len(containerName) == 0 {
 		glog.V(4).Infof("defaulting container name to %s", pod.Spec.Containers[0].Name)

pkg/registry/pod/strategy.go

@@ -332,6 +332,11 @@ func podHasContainerWithName(pod *api.Pod, containerName string) bool {
 			return true
 		}
 	}
+	for _, c := range pod.Spec.InitContainers {
+		if c.Name == containerName {
+			return true
+		}
+	}
 	return false
 }