feat(kube): create namespace if it does not exist

cmd/helm/init.go

@@ -18,7 +18,6 @@ Kubernetes Cluster and sets up local configuration in $HELM_HOME (default: ~/.he
 var (
 	tillerImg            string
 	clientOnly           bool
-	initSkipNamespace    bool
 	defaultRepository    = "kubernetes-charts"
 	defaultRepositoryURL = "http://storage.googleapis.com/kubernetes-charts"
 )
@@ -27,7 +26,6 @@ func init() {
 	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.")
 	RootCommand.AddCommand(initCmd)
 }
 
@@ -61,12 +59,7 @@ func runInit(cmd *cobra.Command, args []string) error {
 }
 
 func installTiller() error {
-	i := client.NewInstaller()
-	i.Tiller["Image"] = tillerImg
-	i.Tiller["Namespace"] = tillerNamespace
-	err := i.Install(flagDebug, !initSkipNamespace)
-
-	if err != nil {
+	if err := client.Install(tillerNamespace, tillerImg, flagDebug); err != nil {
 		return fmt.Errorf("error installing: %s", err)
 	}
 	fmt.Println("\nTiller (the helm server side component) has been installed into your Kubernetes Cluster.")

pkg/client/install.go

@@ -10,49 +10,33 @@ import (
 	"k8s.io/helm/pkg/kube"
 )
 
-// Installer installs tiller into Kubernetes
-//
-// See InstallYAML.
-type Installer struct {
-
-	// Metadata holds any global metadata attributes for the resources
-	Metadata map[string]interface{}
-
-	// Tiller specific metadata
-	Tiller map[string]interface{}
-}
-
-// NewInstaller creates a new Installer
-func NewInstaller() *Installer {
-	return &Installer{
-		Metadata: map[string]interface{}{},
-		Tiller:   map[string]interface{}{},
-	}
-}
-
 // Install uses kubernetes client to install tiller
 //
 // Returns the string output received from the operation, and an error if the
 // command failed.
 //
 // 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
+func Install(namespace, image string, verbose bool) error {
+	kc := kube.New(nil)
 
-	// Add namespace
-	if createNS {
-		nstpl := template.New("namespace").Funcs(sprig.TxtFuncMap())
-		if err := template.Must(nstpl.Parse(NamespaceYAML)).Execute(&b, i); err != nil {
+	if namespace == "" {
+		ns, _, err := kc.DefaultNamespace()
+		if err != nil {
 			return err
 		}
+		namespace = ns
 	}
 
+	var b bytes.Buffer
+
 	// Add main install YAML
 	istpl := template.New("install").Funcs(sprig.TxtFuncMap())
-	if err := template.Must(istpl.Parse(InstallYAML)).Execute(&b, i); err != nil {
+
+	cfg := struct {
+		Namespace, Image string
+	}{namespace, image}
+
+	if err := template.Must(istpl.Parse(InstallYAML)).Execute(&b, cfg); err != nil {
 		return err
 	}
 
@@ -60,24 +44,12 @@ func (i *Installer) Install(verbose, createNS bool) error {
 		fmt.Println(b.String())
 	}
 
-	return kube.New(nil).Create(i.Tiller["Namespace"].(string), &b)
+	return kc.Create(namespace, &b)
 }
 
-// NamespaceYAML is the installation for a namespace.
-const NamespaceYAML = `
----{{$namespace := default "helm" .Tiller.Namespace}}
-apiVersion: v1
-kind: Namespace
-metadata:
-  labels:
-    app: helm
-    name: helm-namespace
-  name: {{$namespace}}
-`
-
 // InstallYAML is the installation YAML for DM.
 const InstallYAML = `
----{{$namespace := default "helm" .Tiller.Namespace}}
+---
 apiVersion: v1
 kind: ReplicationController
 metadata:
@@ -85,7 +57,7 @@ metadata:
     app: helm
     name: tiller
   name: tiller-rc
-  namespace: {{$namespace}}
+  namespace: {{ .Namespace }}
 spec:
   replicas: 1
   selector:
@@ -103,7 +75,7 @@ spec:
             valueFrom:
               fieldRef:
                 fieldPath: metadata.namespace
-        image: {{default "gcr.io/kubernetes-helm/tiller:canary" .Tiller.Image}}
+        image: {{default "gcr.io/kubernetes-helm/tiller:canary" .Image}}
         name: tiller
         ports:
         - containerPort: 44134

pkg/kube/client.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"io"
 
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/errors"
 	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
 	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
 	"k8s.io/kubernetes/pkg/kubectl/resource"
@@ -28,6 +30,9 @@ type ResourceActorFunc func(*resource.Info) error
 //
 // Namespace will set the namespace
 func (c *Client) Create(namespace string, reader io.Reader) error {
+	if err := c.ensureNamespace(namespace); err != nil {
+		return err
+	}
 	return perform(c, namespace, reader, createResource)
 }
 
@@ -44,7 +49,7 @@ func perform(c *Client, namespace string, reader io.Reader, fn ResourceActorFunc
 	r := c.NewBuilder(includeThirdPartyAPIs).
 		ContinueOnError().
 		NamespaceParam(namespace).
-		RequireNamespace().
+		DefaultNamespace().
 		Stream(reader, "").
 		Flatten().
 		Do()
@@ -83,3 +88,18 @@ func createResource(info *resource.Info) error {
 func deleteResource(info *resource.Info) error {
 	return resource.NewHelper(info.Client, info.Mapping).Delete(info.Namespace, info.Name)
 }
+
+func (c *Client) ensureNamespace(namespace string) error {
+	client, err := c.Client()
+	if err != nil {
+		return err
+	}
+
+	ns := &api.Namespace{}
+	ns.Name = namespace
+	_, err = client.Namespaces().Create(ns)
+	if err != nil && !errors.IsAlreadyExists(err) {
+		return err
+	}
+	return nil
+}