lkar: improve commands help structure

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

cmd/lkar/auth.go

@@ -28,6 +28,8 @@ import (
 	"oras.land/oras-go/v2/registry/remote/auth"
 )
 
+var authGroup = &cobra.Group{ID: "0_auth", Title: "Authentication Commands:"}
+
 var (
 	passStdin bool
 
@@ -45,6 +47,7 @@ Log in with username and password in an interactive terminal and no TLS check:
   lkar login --insecure localhost:5000
 `,
 		Args:    cobra.ExactArgs(1),
+		GroupID: authGroup.ID,
 		PreRunE: setup,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if user == "" {
@@ -110,9 +113,10 @@ Log in with username and password in an interactive terminal and no TLS check:
 		},
 	}
 	logoutCmd = &cobra.Command{
-		Use:   "logout [repository]",
-		Short: "Logout from an Artifact Registry repository",
-		Args:  cobra.ExactArgs(1),
+		Use:     "logout [repository]",
+		Short:   "Logout from an Artifact Registry repository",
+		GroupID: authGroup.ID,
+		Args:    cobra.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			creds, err := credsStore.Get(cmd.Context(), repoURL())
 			if err != nil {
@@ -129,4 +133,5 @@ Log in with username and password in an interactive terminal and no TLS check:
 func init() {
 	loginCmd.Flags().BoolVar(&passStdin, "password-stdin", false, "Take the password from stdin")
 	rootCmd.AddCommand(loginCmd, logoutCmd)
+	rootCmd.AddGroup(authGroup)
 }

cmd/lkar/packages.go

@@ -20,10 +20,13 @@ import (
 	"github.com/spf13/cobra"
 )
 
+var PkgGroup = &cobra.Group{ID: "2_packages", Title: "Package Commands:"}
+
 func newPkgCmd(typ string) *cobra.Command {
 	pkgCmd := &cobra.Command{
 		Use:               typ,
-		Short:             fmt.Sprintf("Root command for %s management", typ),
+		Short:             fmt.Sprintf("Manage %s packages", typ),
+		GroupID:           PkgGroup.ID,
 		PersistentPreRunE: setup,
 	}
 	pkgCmd.AddCommand(
@@ -37,6 +40,7 @@ func newPkgCmd(typ string) *cobra.Command {
 }
 
 func init() {
+	rootCmd.AddGroup(PkgGroup)
 	for _, v := range []string{"apk", "deb", "rpm", "helm"} {
 		rootCmd.AddCommand(newPkgCmd(v))
 	}

cmd/lkar/repo.go

@@ -30,11 +30,14 @@ import (
 )
 
 var (
+	repoGroup = &cobra.Group{ID: "1_repositories", Title: "Repository Commands:"}
+
 	repoCmd = &cobra.Command{
 		Use:     "repositories [registry]",
 		Short:   "List repositories in the registry",
 		Aliases: []string{"repo", "repos"},
 		Args:    cobra.ExactArgs(1),
+		GroupID: repoGroup.ID,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			u := urlWithType() + "/_repositories/" + repository
 			if repository == "" {
@@ -102,4 +105,5 @@ func init() {
 	repoCmd.PersistentFlags().StringVarP(&output, "output", "o", "table", "Output format (table, json, yaml)")
 	repoCmd.RegisterFlagCompletionFunc("output", completeOutput)
 	rootCmd.AddCommand(repoCmd)
+	rootCmd.AddGroup(repoGroup)
 }

cmd/lkar/version.go

@@ -24,9 +24,10 @@ import (
 
 var (
 	cmdVersion = &cobra.Command{
-		Use: "version",
+		Use:   "version",
+		Short: "Print the version and build date of lk-artifact-registry",
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("%s (%s)\n", artifact_registry.Version, artifact_registry.BuildDate)
+			fmt.Printf("%s\n%s\n", artifact_registry.Version, artifact_registry.BuildDate)
 		},
 	}
 )

cmd/lkard/main.go

@@ -147,6 +147,10 @@ var (
 			if tagPerArtifact {
 				opts = append(opts, storage.WithArtifactTags())
 			}
+			if strings.HasSuffix(backend, "docker.io") && proxyAddr == "" {
+				logger.C(cmd.Context()).Warnf("using docker.io as backend without proxy is not recommended")
+				logger.C(cmd.Context()).Warnf("the rate limit of 100 requests per 6 hours is very easy to reach using this tool")
+			}
 			if err := run(cmd.Context(), repo, opts...); err != nil {
 				logger.C(cmd.Context()).Fatal(err)
 			}