Tweak CLI interface

logs/watcher.go

@@ -47,27 +47,27 @@ type PodWatcherFunc func(KubernetesClient, string, *metav1.LabelSelector, io.Wri
 // Watcher watches a deployment and tails the logs for its currently active
 // pods.
 type Watcher struct {
-	deployName                 string
-	container                  string
-	allowNonExistentDeployment bool
-	clientset                  KubernetesClient
-	deployment                 *appsv1.Deployment
-	podWatcher                 PodWatcherInterface
-	podWatcherFunc             PodWatcherFunc
-	errChan                    chan error
-	dst                        *concurrentWriter
+	deployName     string
+	container      string
+	strictExist    bool
+	clientset      KubernetesClient
+	deployment     *appsv1.Deployment
+	podWatcher     PodWatcherInterface
+	podWatcherFunc PodWatcherFunc
+	errChan        chan error
+	dst            *concurrentWriter
 }
 
 // NewWatcher creates a new Watcher.
-func NewWatcher(deployName string, container string, allowNonExistentDeployment bool, clientset KubernetesClient, podWatcherFunc PodWatcherFunc, dst io.Writer) *Watcher {
+func NewWatcher(deployName string, container string, strictExist bool, clientset KubernetesClient, podWatcherFunc PodWatcherFunc, dst io.Writer) *Watcher {
 	return &Watcher{
-		deployName:                 deployName,
-		container:                  container,
-		allowNonExistentDeployment: allowNonExistentDeployment,
-		clientset:                  clientset,
-		podWatcherFunc:             podWatcherFunc,
-		errChan:                    make(chan error),
-		dst:                        &concurrentWriter{w: dst},
+		deployName:     deployName,
+		container:      container,
+		strictExist:    strictExist,
+		clientset:      clientset,
+		podWatcherFunc: podWatcherFunc,
+		errChan:        make(chan error),
+		dst:            &concurrentWriter{w: dst},
 	}
 }
 

logs/watcher_test.go

@@ -36,7 +36,7 @@ func TestWatcherAllowNonExistent(t *testing.T) {
 
 	var buf bytes.Buffer
 	client := logs.KubernetesClient{Interface: clientset}
-	watcher := logs.NewWatcher("mydeployment", "mycontainer", false, client, mockPodwatcherFunc(nil), &buf)
+	watcher := logs.NewWatcher("mydeployment", "mycontainer", true, client, mockPodwatcherFunc(nil), &buf)
 
 	err := watcher.Watch(context.Background())
 	assert.EqualError(t, err, `deployments.apps "mydeployment" not found`)
@@ -52,7 +52,7 @@ func TestWatcherPodWatcherError(t *testing.T) {
 	var buf bytes.Buffer
 	client := logs.KubernetesClient{Interface: clientset}
 	wantErr := errors.New("foo")
-	watcher := logs.NewWatcher("mydeployment", "mycontainer", false, client, mockPodwatcherFunc(wantErr), &buf)
+	watcher := logs.NewWatcher("mydeployment", "mycontainer", true, client, mockPodwatcherFunc(wantErr), &buf)
 
 	go func() {
 		defer deploymentsWatcher.Stop()
@@ -105,7 +105,7 @@ func TestWatcherWithPodWatcher(t *testing.T) {
 
 	var buf bytes.Buffer
 	client := logs.KubernetesClient{Interface: clientset}
-	watcher := logs.NewWatcher("mydeployment", "mycontainer", true, client, logs.NewPodWatcher, &buf)
+	watcher := logs.NewWatcher("mydeployment", "mycontainer", false, client, logs.NewPodWatcher, &buf)
 
 	err := watcher.Watch(ctx)
 	require.EqualError(t, err, context.Canceled.Error())

main.go

@@ -15,10 +15,10 @@ import (
 
 func main() {
 	var (
-		kubeconfig                 *string
-		deployName                 *string
-		container                  *string
-		allowNonExistentDeployment *bool
+		kubeconfig  *string
+		deployName  *string
+		container   *string
+		strictExist *bool
 	)
 	if home := homedir.HomeDir(); home != "" {
 		kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
@@ -27,7 +27,7 @@ func main() {
 	}
 	deployName = flag.String("deployment", "", "name of a deployment to monitor")
 	container = flag.String("container", "", "name of a specific container")
-	allowNonExistentDeployment = flag.Bool("allow-nonexistent", true, "allow deployment to be non-existent on launch")
+	strictExist = flag.Bool("strict-exist", false, "require deployment to exist on launch")
 	flag.Parse()
 
 	config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
@@ -44,7 +44,7 @@ func main() {
 	watcher := logs.NewWatcher(
 		*deployName,
 		*container,
-		*allowNonExistentDeployment,
+		*strictExist,
 		logs.KubernetesClient{Interface: clientset},
 		logs.NewPodWatcher,
 		os.Stdout,