Fix help for Cobra commands

* The help function was shadowing the root command via 'cmd'
* Cobra-defined commands probably have no legacy CLI help so we print their
  usage string

commands/root.go

@@ -76,7 +76,7 @@ func newRootCommand(cnf *config.Config, assets *vendorization.VendorAssets) *cob
 				}()
 			}
 		},
-		Run: func(cmd *cobra.Command, _ []string) {
+		Run: func(cmd *cobra.Command, args []string) {
 			c := &legacy.CLIWrapper{
 				Config:             cnf,
 				Version:            config.Version,
@@ -93,7 +93,7 @@ func newRootCommand(cnf *config.Config, assets *vendorization.VendorAssets) *cob
 				return
 			}
 
-			if err := c.Exec(cmd.Context(), os.Args[1:]...); err != nil {
+			if err := c.Exec(cmd.Context(), args...); err != nil {
 				debugLog("%s\n", color.RedString(err.Error()))
 				exitCode := 1
 				var execErr *exec.ExitError
@@ -113,16 +113,22 @@ func newRootCommand(cnf *config.Config, assets *vendorization.VendorAssets) *cob
 		},
 	}
 
-	cmd.SetHelpFunc(func(cmd *cobra.Command, args []string) {
-		if cmd.Context() == nil {
-			cmd.SetContext(context.Background())
+	cmd.SetHelpFunc(func(innerCmd *cobra.Command, args []string) {
+		if innerCmd.Use != cmd.Use {
+			// For real (Cobra) commands, print the usage string.
+			innerCmd.Println(innerCmd.UsageString())
+			return
 		}
 
+		// Others will be passed to the legacy CLI's help command.
 		if !slices.Contains(args, "--help") && !slices.Contains(args, "-h") {
 			args = append([]string{"help"}, args...)
 		}
+		if len(args) == 1 && (args[0] == "-h" || args[0] == "--help") {
+			args = []string{"help"}
+		}
 
-		cmd.Run(cmd, args)
+		cmd.Run(innerCmd, args)
 	})
 
 	cmd.PersistentFlags().BoolP("version", "V", false, fmt.Sprintf("Displays the %s version", cnf.Application.Name))