fix(helm): allow user to skip namespace creation

This addresses two issues: #699 and #713. It is now possible to skip
creating namespaces. In additional, a trivial bug was fixed that allows
you to create a custom namespace.

cmd/helm/init.go

@@ -15,15 +15,18 @@ Kubernetes Cluster and sets up local configuration in $HELM_HOME (default: ~/.he
 `
 
 var (
-	tillerImg       string
-	clientOnly      bool
-	tillerNamespace string
+	tillerImg         string
+	tillerNamespace   string
+	clientOnly        bool
+	initSkipNamespace bool
 )
 
 func init() {
-	initCmd.Flags().StringVarP(&tillerImg, "tiller-image", "i", "", "override tiller image")
-	initCmd.Flags().BoolVarP(&clientOnly, "client-only", "c", false, "If set does not install tiller")
-	initCmd.Flags().StringVarP(&tillerNamespace, "namespace", "n", "helm", "set the tiller namespace")
+	f := initCmd.Flags()
+	f.StringVarP(&tillerImg, "tiller-image", "i", "", "override tiller image")
+	f.BoolVarP(&clientOnly, "client-only", "c", false, "If set does not install tiller")
+	f.BoolVarP(&initSkipNamespace, "skip-namespace", "s", false, "Do not attempt to create a namespace. Assume the namespace is already there.")
+	f.StringVarP(&tillerNamespace, "namespace", "n", "helm", "set the tiller namespace")
 	RootCommand.AddCommand(initCmd)
 }
 
@@ -60,7 +63,7 @@ func installTiller() error {
 	i := client.NewInstaller()
 	i.Tiller["Image"] = tillerImg
 	i.Tiller["Namespace"] = tillerNamespace
-	err := i.Install(flagVerbose)
+	err := i.Install(flagVerbose, !initSkipNamespace)
 
 	if err != nil {
 		return fmt.Errorf("error installing: %s", err)

pkg/client/install.go

@@ -33,14 +33,24 @@ func NewInstaller() *Installer {
 //
 // Returns the string output received from the operation, and an error if the
 // command failed.
-func (i *Installer) Install(verbose bool) error {
+//
+// If verbose is true, this will print the manifest to stdout.
+//
+// If createNS is true, this will also create the namespace.
+func (i *Installer) Install(verbose, createNS bool) error {
 
 	var b bytes.Buffer
-	err := template.Must(template.New("manifest").Funcs(sprig.TxtFuncMap()).
-		Parse(InstallYAML)).
-		Execute(&b, i)
+	t := template.New("manifest").Funcs(sprig.TxtFuncMap())
+
+	// Add namespace
+	if createNS {
+		if err := template.Must(t.Parse(NamespaceYAML)).Execute(&b, i); err != nil {
+			return err
+		}
+	}
 
-	if err != nil {
+	// Add main install YAML
+	if err := template.Must(t.Parse(InstallYAML)).Execute(&b, i); err != nil {
 		return err
 	}
 
@@ -48,11 +58,10 @@ func (i *Installer) Install(verbose bool) error {
 		fmt.Println(b.String())
 	}
 
-	return kube.New(nil).Create("helm", &b)
+	return kube.New(nil).Create(i.Tiller["Namespace"].(string), &b)
 }
 
-// InstallYAML is the installation YAML for DM.
-const InstallYAML = `
+const NamespaceYAML = `
 ---{{$namespace := default "helm" .Tiller.Namespace}}
 apiVersion: v1
 kind: Namespace
@@ -61,7 +70,11 @@ metadata:
     app: helm
     name: helm-namespace
   name: {{$namespace}}
----
+`
+
+// InstallYAML is the installation YAML for DM.
+const InstallYAML = `
+---{{$namespace := default "helm" .Tiller.Namespace}}
 apiVersion: v1
 kind: ReplicationController
 metadata:
@@ -93,5 +106,4 @@ spec:
         - containerPort: 44134
           name: tiller
         imagePullPolicy: Always
----
 `