Merge pull request #64608 from dixudx/config_view_context

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

apply global flag "context" for kubectl config view

**What this PR does / why we need it**:
`--context` is a global flag, which should be applied to `kubectl config view` as well when minifying.

Currently this command is only available for `current-context`. With this PR, it will be easier for users to view other non current contexts when minifying.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #64583

**Special notes for your reviewer**:
/cc soltysh juanvallejo 
 
**Release note**:

```release-note
apply global flag "context" for kubectl config view --minify
```

pkg/kubectl/cmd/config/config_test.go

@@ -865,12 +865,12 @@ func testConfigCommand(args []string, startingConfig clientcmdapi.Config, t *tes
 
 	streams, _, buf, _ := genericclioptions.NewTestIOStreams()
 	cmd := NewCmdConfig(cmdutil.NewFactory(genericclioptions.NewTestConfigFlags()), clientcmd.NewDefaultPathOptions(), streams)
+	// "context" is a global flag, inherited from base kubectl command in the real world
+	cmd.PersistentFlags().String("context", "", "The name of the kubeconfig context to use")
 	cmd.SetArgs(argsToUse)
 	cmd.Execute()
 
-	// outBytes, _ := ioutil.ReadFile(fakeKubeFile.Name())
 	config := clientcmd.GetConfigFromFileOrDie(fakeKubeFile.Name())
-
 	return buf.String(), *config
 }
 

pkg/kubectl/cmd/config/view.go

@@ -43,6 +43,7 @@ type ViewOptions struct {
 	Minify       bool
 	RawByteData  bool
 
+	Context      string
 	OutputFormat string
 
 	genericclioptions.IOStreams
@@ -110,6 +111,7 @@ func (o *ViewOptions) Complete(cmd *cobra.Command) error {
 		return err
 	}
 	o.PrintObject = printer.PrintObj
+	o.Context = cmdutil.GetFlagString(cmd, "context")
 
 	return nil
 }
@@ -129,6 +131,9 @@ func (o ViewOptions) Run() error {
 	}
 
 	if o.Minify {
+		if len(o.Context) > 0 {
+			config.CurrentContext = o.Context
+		}
 		if err := clientcmdapi.MinifyConfig(config); err != nil {
 			return err
 		}

pkg/kubectl/cmd/config/view_test.go

@@ -43,19 +43,19 @@ func TestViewCluster(t *testing.T) {
 			"my-cluster": {Server: "https://192.168.0.1:3434"},
 		},
 		Contexts: map[string]*clientcmdapi.Context{
-			"minikube":  {AuthInfo: "minikube", Cluster: "minikube"},
-			"my-cluser": {AuthInfo: "mu-cluster", Cluster: "my-cluster"},
+			"minikube":   {AuthInfo: "minikube", Cluster: "minikube"},
+			"my-cluster": {AuthInfo: "mu-cluster", Cluster: "my-cluster"},
 		},
 		CurrentContext: "minikube",
 		AuthInfos: map[string]*clientcmdapi.AuthInfo{
-			"minikube":  {Token: "minikube-token"},
-			"my-cluser": {Token: "minikube-token"},
+			"minikube":   {Token: "minikube-token"},
+			"mu-cluster": {Token: "minikube-token"},
 		},
 	}
+
 	test := viewClusterTest{
 		description: "Testing for kubectl config view",
 		config:      conf,
-		flags:       []string{},
 		expected: `apiVersion: v1
 clusters:
 - cluster:
@@ -72,7 +72,7 @@ contexts:
 - context:
     cluster: my-cluster
     user: mu-cluster
-  name: my-cluser
+  name: my-cluster
 current-context: minikube
 kind: Config
 preferences: {}
@@ -80,10 +80,13 @@ users:
 - name: minikube
   user:
     token: minikube-token
-- name: my-cluser
+- name: mu-cluster
   user:
-    token: minikube-token` + "\n"}
+    token: minikube-token` + "\n",
+	}
+
 	test.run(t)
+
 }
 
 func TestViewClusterMinify(t *testing.T) {
@@ -95,20 +98,27 @@ func TestViewClusterMinify(t *testing.T) {
 			"my-cluster": {Server: "https://192.168.0.1:3434"},
 		},
 		Contexts: map[string]*clientcmdapi.Context{
-			"minikube":  {AuthInfo: "minikube", Cluster: "minikube"},
-			"my-cluser": {AuthInfo: "mu-cluster", Cluster: "my-cluster"},
+			"minikube":   {AuthInfo: "minikube", Cluster: "minikube"},
+			"my-cluster": {AuthInfo: "mu-cluster", Cluster: "my-cluster"},
 		},
 		CurrentContext: "minikube",
 		AuthInfos: map[string]*clientcmdapi.AuthInfo{
-			"minikube":  {Token: "minikube-token"},
-			"my-cluser": {Token: "minikube-token"},
+			"minikube":   {Token: "minikube-token"},
+			"mu-cluster": {Token: "minikube-token"},
 		},
 	}
-	test := viewClusterTest{
-		description: "Testing for kubectl config view --minify=true",
-		config:      conf,
-		flags:       []string{"--minify=true"},
-		expected: `apiVersion: v1
+
+	testCases := []struct {
+		description string
+		config      clientcmdapi.Config
+		flags       []string
+		expected    string
+	}{
+		{
+			description: "Testing for kubectl config view --minify=true",
+			config:      conf,
+			flags:       []string{"--minify=true"},
+			expected: `apiVersion: v1
 clusters:
 - cluster:
     server: https://192.168.99.100:8443
@@ -124,8 +134,41 @@ preferences: {}
 users:
 - name: minikube
   user:
-    token: minikube-token` + "\n"}
-	test.run(t)
+    token: minikube-token` + "\n",
+		},
+		{
+			description: "Testing for kubectl config view --minify=true --context=my-cluster",
+			config:      conf,
+			flags:       []string{"--minify=true", "--context=my-cluster"},
+			expected: `apiVersion: v1
+clusters:
+- cluster:
+    server: https://192.168.0.1:3434
+  name: my-cluster
+contexts:
+- context:
+    cluster: my-cluster
+    user: mu-cluster
+  name: my-cluster
+current-context: my-cluster
+kind: Config
+preferences: {}
+users:
+- name: mu-cluster
+  user:
+    token: minikube-token` + "\n",
+		},
+	}
+
+	for _, test := range testCases {
+		cmdTest := viewClusterTest{
+			description: test.description,
+			config:      test.config,
+			flags:       test.flags,
+			expected:    test.expected,
+		}
+		cmdTest.run(t)
+	}
 }
 
 func (test viewClusterTest) run(t *testing.T) {
@@ -143,7 +186,10 @@ func (test viewClusterTest) run(t *testing.T) {
 	pathOptions.EnvVar = ""
 	streams, _, buf, _ := genericclioptions.NewTestIOStreams()
 	cmd := NewCmdConfigView(cmdutil.NewFactory(genericclioptions.NewTestConfigFlags()), streams, pathOptions)
+	// "context" is a global flag, inherited from base kubectl command in the real world
+	cmd.Flags().String("context", "", "The name of the kubeconfig context to use")
 	cmd.Flags().Parse(test.flags)
+
 	if err := cmd.Execute(); err != nil {
 		t.Fatalf("unexpected error executing command: %v,kubectl config view flags: %v", err, test.flags)
 	}