wip: kubeconfig command added to export kubeconfigs of running clusters

README.md

@@ -9,7 +9,6 @@
   <a href="https://github.com/Trendyol/kink/releases/latest"><img src="https://img.shields.io/github/release/Trendyol/kink.svg" alt="GitHub release"></a>
     <a href="https://github.com/Trendyol/kink/"><img src="https://img.shields.io/github/go-mod/go-version/Trendyol/kink" alt="Go Mod"></a>
 </p>
-</p>
 
 ---
 

cmd/delete.go

@@ -19,16 +19,14 @@ package cmd
 import (
 	"context"
 	"fmt"
-	"os"
-	"os/user"
 
 	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	v1 "k8s.io/client-go/kubernetes/typed/core/v1"
 
 	"github.com/AlecAivazis/survey/v2"
 	"github.com/Trendyol/kink/pkg/kubernetes"
 	"github.com/spf13/cobra"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	v1 "k8s.io/client-go/kubernetes/typed/core/v1"
 )
 
 // NewCmdDelete represents the delete command
@@ -62,18 +60,13 @@ func NewCmdDelete() *cobra.Command {
 
 			ctx := context.TODO()
 
-			currentUser, err := user.Current()
-			if err != nil {
-				return err
-			}
-
-			hostname, err := os.Hostname()
+			selector, err := getClusterSelector()
 			if err != nil {
 				return err
 			}
 
 			pods, err := podClient.List(ctx, metav1.ListOptions{
-				LabelSelector: fmt.Sprintf("runned-by=%s", fmt.Sprintf("%s_%s", currentUser.Username, hostname)),
+				LabelSelector: selector,
 			})
 
 			options := metav1.DeleteOptions{}

cmd/kubeconfig.go

@@ -0,0 +1,126 @@
+/*
+Copyright © 2021 pe.container <pe.container@trendyol.com>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/Trendyol/kink/pkg/kubernetes"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func init() {
+	rootCmd.AddCommand(NewCmdKubeConfig())
+}
+
+func NewCmdKubeConfig() *cobra.Command {
+	var (
+		name       string
+		namespace  string
+		outputPath string
+	)
+
+	cmd := &cobra.Command{
+		Use:   "kubeconfig",
+		Short: "Get running cluster's kubeconfig",
+		Long: `Get running cluster's kubeconfig
+		usage: kink kubeconfig --name kink-demo --namespace default`,
+		SilenceUsage: true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			client, err := kubernetes.Client()
+			if err != nil {
+				return err
+			}
+
+			if namespace == "" {
+				n, _, err := kubernetes.DefaultClientConfig().Namespace()
+				if err != nil {
+					return err
+				}
+
+				namespace = n
+			}
+
+			if outputPath != "" {
+				outputPath, err = filepath.Abs(outputPath)
+				if err != nil {
+					return errors.Wrap(err, "failed to get absolute path of output path")
+				}
+
+				pathStat, err := os.Stat(outputPath)
+				if err != nil {
+					return errors.Wrap(err, "failed to get stat output path")
+				}
+
+				if pathStat.IsDir() {
+					outputPath = fmt.Sprintf("%s/kink-%s-kubeconfig", outputPath, name)
+				}
+			}
+
+			ctx := context.TODO()
+			serviceClient := client.CoreV1().Services(namespace)
+
+			svc, err := serviceClient.Get(ctx, name, metav1.GetOptions{})
+			if err != nil {
+				return err
+			}
+
+			kubeconfig, err := doExec(name, namespace, []string{"kubectl", "config", "view", "--minify", "--flatten"})
+			if err != nil {
+				return err
+			}
+
+			hostIP, err := doExec(name, namespace, []string{"sh", "-c", "echo $CERT_SANS"})
+			if err != nil {
+				return err
+			}
+
+			podIP, err := doExec(name, namespace, []string{"sh", "-c", "echo $API_SERVER_ADDRESS"})
+			if err != nil {
+				return err
+			}
+
+			kubeconfig = strings.ReplaceAll(kubeconfig, podIP, hostIP)
+
+			nodePort := svc.Spec.Ports[0].NodePort
+			kubeconfig = strings.ReplaceAll(kubeconfig, "30001", fmt.Sprint(nodePort))
+
+			if outputPath != "" {
+				if err := os.WriteFile(outputPath, []byte(kubeconfig), 0o600); err != nil {
+					return errors.Wrap(err, "failed to write kubeconfig to "+kubeconfig)
+				}
+				fmt.Printf("kubeconfig exported for %s to %s\n", name, outputPath)
+			} else {
+				fmt.Print(kubeconfig) // write kubeconfig to stdout
+			}
+
+			return nil
+		},
+	}
+
+	cmd.Flags().StringVar(&name, "name", "", "Cluster name")
+	cmd.Flags().StringVarP(&namespace, "namespace", "n", "", "Target namespace")
+	cmd.Flags().StringVarP(&outputPath, "output", "o", "", "Output path for kubeconfig")
+
+	return cmd
+}

cmd/list.go

@@ -18,16 +18,14 @@ package cmd
 
 import (
 	"context"
-	"fmt"
 	"os"
-	"os/user"
 
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/cli-runtime/pkg/printers"
 
 	"github.com/Trendyol/kink/pkg/kubernetes"
 	"github.com/spf13/cobra"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
 // NewCmdList represents the list command
@@ -57,18 +55,13 @@ func NewCmdList() *cobra.Command {
 
 			kubeclient := client.CoreV1().Pods(namespace)
 
-			user, err := user.Current()
-			if err != nil {
-				return err
-			}
-
-			hostname, err := os.Hostname()
+			selector, err := getClusterSelector()
 			if err != nil {
 				return err
 			}
 
 			pods, err := kubeclient.List(context.TODO(), metav1.ListOptions{
-				LabelSelector: fmt.Sprintf("runned-by=%s", fmt.Sprintf("%s_%s", user.Username, hostname)),
+				LabelSelector: selector,
 			})
 			if err != nil {
 				return err

cmd/util.go

@@ -0,0 +1,21 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"os/user"
+)
+
+func getClusterSelector() (string, error) {
+	usr, err := user.Current()
+	if err != nil {
+		return "", err
+	}
+
+	hostname, err := os.Hostname()
+	if err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf("runned-by=%s", fmt.Sprintf("%s_%s", usr.Username, hostname)), nil
+}