Add uninstall cmd

cmd/tk/uninstall.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"time"
+
+	"github.com/manifoldco/promptui"
+	"github.com/spf13/cobra"
+)
+
+var uninstallCmd = &cobra.Command{
+	Use:   "uninstall",
+	Short: "Uninstall the toolkit components",
+	Long: `
+The uninstall command removes the namespace, cluster roles,
+cluster role bindings and CRDs`,
+	Example: `  uninstall --namespace=gitops-system --crds --dry-run`,
+	RunE:    uninstallCmdRun,
+}
+
+var (
+	uninstallCRDs   bool
+	uninstallDryRun bool
+)
+
+func init() {
+	uninstallCmd.Flags().BoolVarP(&uninstallCRDs, "crds", "", false,
+		"removes all CRDs previously installed")
+	uninstallCmd.Flags().BoolVarP(&uninstallDryRun, "dry-run", "", false,
+		"only print the object that would be deleted")
+
+	rootCmd.AddCommand(uninstallCmd)
+}
+
+func uninstallCmdRun(cmd *cobra.Command, args []string) error {
+	timeout := time.Minute * 5
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+
+	dryRun := ""
+	if uninstallDryRun {
+		dryRun = "--dry-run=client"
+	} else {
+		prompt := promptui.Prompt{
+			Label:     fmt.Sprintf("Are you sure you want to delete the %s namespace", namespace),
+			IsConfirm: true,
+		}
+		if _, err := prompt.Run(); err != nil {
+			fmt.Println(`✗`, "aborting")
+			os.Exit(1)
+		}
+	}
+
+	kinds := "namespace,clusterroles,clusterrolebindings"
+	if uninstallCRDs {
+		kinds += ",crds"
+	}
+
+	command := fmt.Sprintf("kubectl delete %s -l app.kubernetes.io/instance=%s %s",
+		kinds, namespace, dryRun)
+	c := exec.CommandContext(ctx, "/bin/sh", "-c", command)
+
+	var stdoutBuf, stderrBuf bytes.Buffer
+	c.Stdout = io.MultiWriter(os.Stdout, &stdoutBuf)
+	c.Stderr = io.MultiWriter(os.Stderr, &stderrBuf)
+
+	fmt.Println(`✚`, "uninstalling...")
+	err := c.Run()
+	if err != nil {
+		fmt.Println(`✗`, "uninstall failed")
+		os.Exit(1)
+	}
+
+	fmt.Println(`✔`, "uninstall finished")
+	return nil
+}