added uninstall

Signed-off-by: Patrick Zheng <patrickzheng@microsoft.com>

cmd/notation/plugin/cmd.go

@@ -24,6 +24,7 @@ func Cmd() *cobra.Command {
 	command.AddCommand(
 		pluginListCommand(),
 		pluginInstallCommand(nil),
+		pluginUninstallCommand(nil),
 	)
 
 	return command

cmd/notation/plugin/install.go

@@ -59,7 +59,7 @@ func pluginInstallCommand(opts *pluginInstallOpts) *cobra.Command {
 		Long: `Install a Notation plugin
 
 Example - Install plugin from file system:
-  notation plugin install --file myPlugin.tar.gz --checksum 123abcd
+  notation plugin install --file myPlugin.tar.gz --checksum abcdef
 `,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return installPlugin(cmd, opts)
@@ -139,7 +139,7 @@ func installPluginFromZip(ctx context.Context, zipPath string, force bool) error
 	defer archive.Close()
 	for _, f := range archive.File {
 		fmode := f.Mode()
-		// only consider regular executable files in the zip
+		// only consider regular executable files
 		if fmode.IsRegular() && osutil.IsOwnerExecutalbeFile(fmode) {
 			fileInArchive, err := f.Open()
 			if err != nil {

cmd/notation/plugin/uninstall.go

@@ -0,0 +1,72 @@
+package plugin
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/notaryproject/notation-go/dir"
+	"github.com/notaryproject/notation/cmd/notation/internal/cmdutil"
+	"github.com/spf13/cobra"
+)
+
+type pluginUninstallOpts struct {
+	pluginName string
+	confirmed  bool
+}
+
+func pluginUninstallCommand(opts *pluginUninstallOpts) *cobra.Command {
+	if opts == nil {
+		opts = &pluginUninstallOpts{}
+	}
+	command := &cobra.Command{
+		Use:   "uninstall [flags] <plugin_name>",
+		Short: "Uninstall plugin",
+		Long: `Uninstall a Notation plugin
+
+Example - Uninstall plugin:
+  notation plugin uninstall my-plugin
+`,
+		Args: func(cmd *cobra.Command, args []string) error {
+			if len(args) == 0 {
+				return errors.New("plugin name is required")
+			}
+			opts.pluginName = args[0]
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return unInstallPlugin(cmd, opts)
+		},
+	}
+
+	command.Flags().BoolVarP(&opts.confirmed, "yes", "y", false, "do not prompt for confirmation")
+	return command
+}
+
+func unInstallPlugin(command *cobra.Command, opts *pluginUninstallOpts) error {
+	pluginName := opts.pluginName
+	existed, err := checkPluginExistence(command.Context(), pluginName)
+	if err != nil {
+		return fmt.Errorf("failed to check plugin existence, %w", err)
+	}
+	if !existed {
+		return fmt.Errorf("plugin %s does not exist", pluginName)
+	}
+	pluginPath, err := dir.PluginFS().SysPath(pluginName)
+	if err != nil {
+		return err
+	}
+	prompt := fmt.Sprintf("Are you sure you want to uninstall plugin %q?", pluginName)
+	confirmed, err := cmdutil.AskForConfirmation(os.Stdin, prompt, opts.confirmed)
+	if err != nil {
+		return err
+	}
+	if !confirmed {
+		return nil
+	}
+	err = os.RemoveAll(pluginPath)
+	if err == nil {
+		fmt.Printf("Successfully uninstalled plugin %s\n", pluginName)
+	}
+	return err
+}