Set current namespace from kubeconfig by default (knative#172)

* Set current namespace from kubeconfig by default

Currently kn command does not pick up namespace from kubeconfig but
hardcorded default namespace.

This patch fixes to get namespace from kubeconfig.

Fixes knative#7

* Use NamespaceFactory to get current namespace

* Update unit tests

* Add nil check for ClientConfig

cmd/kn/main.go

@@ -21,10 +21,6 @@ import (
 	"github.com/knative/client/pkg/kn/core"
 )
 
-func init() {
-	core.InitializeConfig()
-}
-
 func main() {
 	err := core.NewKnCommand().Execute()
 	if err != nil {

pkg/kn/commands/namespaced.go

@@ -19,9 +19,6 @@ import (
 	"github.com/spf13/pflag"
 )
 
-// TODO: default namespace should be same scope for the request
-const defaultNamespace = "default"
-
 // AddNamespaceFlags adds the namespace-related flags:
 // * --namespace
 // * --all-namespaces
@@ -43,7 +40,7 @@ func AddNamespaceFlags(flags *pflag.FlagSet, allowAll bool) {
 }
 
 // GetNamespace returns namespace from command specified by flag
-func GetNamespace(cmd *cobra.Command) (string, error) {
+func (kn *KnParams) GetNamespace(cmd *cobra.Command) (string, error) {
 	namespace := cmd.Flag("namespace").Value.String()
 	// check value of all-namepace only if its defined
 	if cmd.Flags().Lookup("all-namespaces") != nil {
@@ -57,7 +54,11 @@ func GetNamespace(cmd *cobra.Command) (string, error) {
 	}
 	// if all-namepaces=False or namespace not given, use default namespace
 	if namespace == "" {
-		namespace = defaultNamespace
+		var err error
+		namespace, err = kn.NamespaceFactory()
+		if err != nil {
+			return "", err
+		}
 	}
 	return namespace, nil
 }

pkg/kn/commands/namespaced_test.go

@@ -36,7 +36,8 @@ func TestGetNamespaceSample(t *testing.T) {
 	expectedNamespace := "test1"
 	testCmd.SetArgs([]string{"--namespace", expectedNamespace})
 	testCmd.Execute()
-	actualNamespace, err := GetNamespace(testCmd)
+	kp := &KnParams{NamespaceFactory: func() (string, error) { return FakeNamespace, nil }}
+	actualNamespace, err := kp.GetNamespace(testCmd)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -45,12 +46,13 @@ func TestGetNamespaceSample(t *testing.T) {
 	}
 }
 
-// test without setting any namespace
+// test current namespace without setting any namespace
 func TestGetNamespaceDefault(t *testing.T) {
 	testCmd := testCommandGenerator(true)
-	expectedNamespace := "default"
+	expectedNamespace := "current"
 	testCmd.Execute()
-	actualNamespace, err := GetNamespace(testCmd)
+	kp := &KnParams{NamespaceFactory: func() (string, error) { return FakeNamespace, nil }}
+	actualNamespace, err := kp.GetNamespace(testCmd)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -67,7 +69,8 @@ func TestGetNamespaceAllNamespacesSet(t *testing.T) {
 	sampleNamespace := "test1"
 	testCmd.SetArgs([]string{"--namespace", sampleNamespace, "--all-namespaces"})
 	testCmd.Execute()
-	actualNamespace, err := GetNamespace(testCmd)
+	kp := &KnParams{NamespaceFactory: func() (string, error) { return FakeNamespace, nil }}
+	actualNamespace, err := kp.GetNamespace(testCmd)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -83,7 +86,8 @@ func TestGetNamespaceDefaultAllNamespacesUnset(t *testing.T) {
 	expectedNamespace := ""
 	testCmd.SetArgs([]string{"--all-namespaces"})
 	testCmd.Execute()
-	actualNamespace, err := GetNamespace(testCmd)
+	kp := &KnParams{NamespaceFactory: func() (string, error) { return FakeNamespace, nil }}
+	actualNamespace, err := kp.GetNamespace(testCmd)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -98,21 +102,8 @@ func TestGetNamespaceAllNamespacesNotDefined(t *testing.T) {
 	expectedNamespace := "test1"
 	testCmd.SetArgs([]string{"--namespace", expectedNamespace})
 	testCmd.Execute()
-	actualNamespace, err := GetNamespace(testCmd)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if actualNamespace != expectedNamespace {
-		t.Fatalf("Incorrect namespace retrieved: %v, expected: %v", actualNamespace, expectedNamespace)
-	}
-}
-
-// test with all-namespace flag not defined and no namespace given
-func TestGetNamespaceDefaultAllNamespacesNotDefined(t *testing.T) {
-	testCmd := testCommandGenerator(false)
-	expectedNamespace := "default"
-	testCmd.Execute()
-	actualNamespace, err := GetNamespace(testCmd)
+	kp := &KnParams{NamespaceFactory: func() (string, error) { return FakeNamespace, nil }}
+	actualNamespace, err := kp.GetNamespace(testCmd)
 	if err != nil {
 		t.Fatal(err)
 	}

pkg/kn/commands/revision/revision_describe.go

@@ -39,7 +39,7 @@ func NewRevisionDescribeCommand(p *commands.KnParams) *cobra.Command {
 				return err
 			}
 
-			namespace, err := commands.GetNamespace(cmd)
+			namespace, err := p.GetNamespace(cmd)
 			if err != nil {
 				return err
 			}

pkg/kn/commands/revision/revision_list.go

@@ -44,7 +44,7 @@ func NewRevisionListCommand(p *commands.KnParams) *cobra.Command {
 			if err != nil {
 				return err
 			}
-			namespace, err := commands.GetNamespace(cmd)
+			namespace, err := p.GetNamespace(cmd)
 			if err != nil {
 				return err
 			}

pkg/kn/commands/service/service_create.go

@@ -59,7 +59,7 @@ func NewServiceCreateCommand(p *commands.KnParams) *cobra.Command {
 				return errors.New("requires the image name to run.")
 			}
 
-			namespace, err := commands.GetNamespace(cmd)
+			namespace, err := p.GetNamespace(cmd)
 			if err != nil {
 				return err
 			}

pkg/kn/commands/service/service_create_test.go

@@ -73,7 +73,7 @@ func TestServiceCreateImage(t *testing.T) {
 	} else if template.Spec.DeprecatedContainer.Image != "gcr.io/foo/bar:baz" {
 		t.Fatalf("wrong image set: %v", template.Spec.DeprecatedContainer.Image)
 	} else if !strings.Contains(output, "foo") || !strings.Contains(output, "created") ||
-		!strings.Contains(output, "default") {
+		!strings.Contains(output, commands.FakeNamespace) {
 		t.Fatalf("wrong stdout message: %v", output)
 	}
 }
@@ -338,7 +338,7 @@ func TestServiceCreateImageForce(t *testing.T) {
 		t.Fatal(err)
 	} else if template.Spec.DeprecatedContainer.Image != "gcr.io/foo/bar:v2" {
 		t.Fatalf("wrong image set: %v", template.Spec.DeprecatedContainer.Image)
-	} else if !strings.Contains(output, "foo") || !strings.Contains(output, "default") {
+	} else if !strings.Contains(output, "foo") || !strings.Contains(output, commands.FakeNamespace) {
 		t.Fatalf("wrong output: %s", output)
 	}
 }
@@ -375,7 +375,7 @@ func TestServiceCreateEnvForce(t *testing.T) {
 		actualEnvVars,
 		expectedEnvVars) {
 		t.Fatalf("wrong env vars:%v", template.Spec.DeprecatedContainer.Env)
-	} else if !strings.Contains(output, "foo") || !strings.Contains(output, "default") {
+	} else if !strings.Contains(output, "foo") || !strings.Contains(output, commands.FakeNamespace) {
 		t.Fatalf("wrong output: %s", output)
 	}
 }

pkg/kn/commands/service/service_delete.go

@@ -43,7 +43,7 @@ func NewServiceDeleteCommand(p *commands.KnParams) *cobra.Command {
 			if err != nil {
 				return err
 			}
-			namespace, err := commands.GetNamespace(cmd)
+			namespace, err := p.GetNamespace(cmd)
 			if err != nil {
 				return err
 			}

pkg/kn/commands/service/service_describe.go

@@ -38,7 +38,7 @@ func NewServiceDescribeCommand(p *commands.KnParams) *cobra.Command {
 				return err
 			}
 
-			namespace, err := commands.GetNamespace(cmd)
+			namespace, err := p.GetNamespace(cmd)
 			if err != nil {
 				return err
 			}

pkg/kn/commands/service/service_list.go

@@ -35,7 +35,7 @@ func NewServiceListCommand(p *commands.KnParams) *cobra.Command {
 			if err != nil {
 				return err
 			}
-			namespace, err := commands.GetNamespace(cmd)
+			namespace, err := p.GetNamespace(cmd)
 			if err != nil {
 				return err
 			}

pkg/kn/commands/service/service_update.go

@@ -40,7 +40,7 @@ func NewServiceUpdateCommand(p *commands.KnParams) *cobra.Command {
 				return errors.New("requires the service name.")
 			}
 
-			namespace, err := commands.GetNamespace(cmd)
+			namespace, err := p.GetNamespace(cmd)
 			if err != nil {
 				return err
 			}

pkg/kn/commands/test_helper.go

@@ -24,11 +24,14 @@ import (
 	client_testing "k8s.io/client-go/testing"
 )
 
+const FakeNamespace = "current"
+
 func CreateTestKnCommand(cmd *cobra.Command, knParams *KnParams) (*cobra.Command, *fake.FakeServingV1alpha1, *bytes.Buffer) {
 	buf := new(bytes.Buffer)
 	fakeServing := &fake.FakeServingV1alpha1{&client_testing.Fake{}}
 	knParams.Output = buf
 	knParams.ServingFactory = func() (serving.ServingV1alpha1Interface, error) { return fakeServing, nil }
+	knParams.NamespaceFactory = func() (string, error) { return FakeNamespace, nil }
 	knCommand := newKnCommand(cmd, knParams)
 	return knCommand, fakeServing, buf
 }
@@ -56,7 +59,7 @@ Eventing: Manage event subscriptions and channels. Connect up event sources.`,
 		rootCmd.SetOutput(params.Output)
 	}
 	rootCmd.PersistentFlags().StringVar(&CfgFile, "config", "", "config file (default is $HOME/.kn.yaml)")
-	rootCmd.PersistentFlags().StringVar(&KubeCfgFile, "kubeconfig", "", "kubectl config file (default is $HOME/.kube/config)")
+	rootCmd.PersistentFlags().StringVar(&params.KubeCfgPath, "kubeconfig", "", "kubectl config file (default is $HOME/.kube/config)")
 
 	rootCmd.AddCommand(subCommand)
 

pkg/kn/commands/types.go

@@ -24,23 +24,39 @@ import (
 // CfgFile is Kn's config file is the path for the Kubernetes config
 var CfgFile string
 
-// KubeCfgFile is the path for the Kubernetes config
-var KubeCfgFile string
-
 // Parameters for creating commands. Useful for inserting mocks for testing.
 type KnParams struct {
-	Output         io.Writer
-	ServingFactory func() (serving.ServingV1alpha1Interface, error)
+	Output           io.Writer
+	ServingFactory   func() (serving.ServingV1alpha1Interface, error)
+	NamespaceFactory func() (string, error)
+
+	KubeCfgPath  string
+	ClientConfig clientcmd.ClientConfig
 }
 
 func (c *KnParams) Initialize() {
 	if c.ServingFactory == nil {
-		c.ServingFactory = GetConfig
+		c.ServingFactory = c.GetConfig
+	}
+	if c.NamespaceFactory == nil {
+		c.NamespaceFactory = c.CurrentNamespace
+	}
+}
+
+func (c *KnParams) CurrentNamespace() (string, error) {
+	if c.ClientConfig == nil {
+		c.ClientConfig = c.GetClientConfig()
 	}
+	name, _, err := c.ClientConfig.Namespace()
+	return name, err
 }
 
-func GetConfig() (serving.ServingV1alpha1Interface, error) {
-	config, err := clientcmd.BuildConfigFromFlags("", KubeCfgFile)
+func (c *KnParams) GetConfig() (serving.ServingV1alpha1Interface, error) {
+	if c.ClientConfig == nil {
+		c.ClientConfig = c.GetClientConfig()
+	}
+	var err error
+	config, err := c.ClientConfig.ClientConfig()
 	if err != nil {
 		return nil, err
 	}
@@ -50,3 +66,11 @@ func GetConfig() (serving.ServingV1alpha1Interface, error) {
 	}
 	return client, nil
 }
+
+func (c *KnParams) GetClientConfig() clientcmd.ClientConfig {
+	loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
+	if len(c.KubeCfgPath) > 0 {
+		loadingRules.ExplicitPath = c.KubeCfgPath
+	}
+	return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
+}

pkg/kn/core/root.go

@@ -19,7 +19,6 @@ import (
 	"fmt"
 	"os"
 	"path"
-	"path/filepath"
 
 	"github.com/knative/client/pkg/kn/commands"
 	"github.com/knative/client/pkg/kn/commands/revision"
@@ -65,7 +64,7 @@ Eventing: Manage event subscriptions and channels. Connect up event sources.`,
 		rootCmd.SetOutput(p.Output)
 	}
 	rootCmd.PersistentFlags().StringVar(&commands.CfgFile, "config", "", "config file (default is $HOME/.kn/config.yaml)")
-	rootCmd.PersistentFlags().StringVar(&commands.KubeCfgFile, "kubeconfig", "", "kubectl config file (default is $HOME/.kube/config)")
+	rootCmd.PersistentFlags().StringVar(&p.KubeCfgPath, "kubeconfig", "", "kubectl config file (default is $HOME/.kube/config)")
 
 	rootCmd.AddCommand(service.NewServiceCommand(p))
 	rootCmd.AddCommand(revision.NewRevisionCommand(p))
@@ -77,28 +76,6 @@ Eventing: Manage event subscriptions and channels. Connect up event sources.`,
 	return rootCmd
 }
 
-func InitializeConfig() {
-	cobra.OnInitialize(initConfig)
-	cobra.OnInitialize(initKubeConfig)
-
-}
-
-func initKubeConfig() {
-	if commands.KubeCfgFile != "" {
-		return
-	}
-	if kubeEnvConf, ok := os.LookupEnv("KUBECONFIG"); ok {
-		commands.KubeCfgFile = kubeEnvConf
-	} else {
-		home, err := homedir.Dir()
-		if err != nil {
-			fmt.Fprintln(os.Stderr, err)
-			os.Exit(1)
-		}
-		commands.KubeCfgFile = filepath.Join(home, ".kube", "config")
-	}
-}
-
 // initConfig reads in config file and ENV variables if set.
 func initConfig() {
 	if commands.CfgFile != "" {