chore(feat/log): using cobra utils for args

Adding this just to illustrate another way of validating the number of
arguments.

Anyway we should choose one way to do it and spread it across all of the
commands with arguments.

pkg/cmd/log.go

@@ -57,6 +57,7 @@ func NewLogCommand(factory factory.Factory, streams genericclioptions.IOStreams)
 		Short:                 logShort,
 		Long:                  logLong,                             // Wrap with templates.LongDesc()
 		Example:               fmt.Sprintf(logExamples, "kubectl"), // Wrap with templates.Examples()
+		Args:                  cobra.ExactArgs(1),
 		PreRunE: func(c *cobra.Command, args []string) error {
 			return o.Validate(c, args)
 		},
@@ -76,17 +77,11 @@ func NewLogCommand(factory factory.Factory, streams genericclioptions.IOStreams)
 }
 
 func (o *LogOptions) Validate(cmd *cobra.Command, args []string) error {
-	switch len(args) {
-	case 1:
-		if meta.IsObjectName(args[0]) {
-			o.traceName = &args[0]
-		} else {
-			tid := types.UID(args[0])
-			o.traceID = &tid
-		}
-		break
-	default:
-		return fmt.Errorf("(TRACE_ID | TRACE_NAME) is a required argument for the log command")
+	if meta.IsObjectName(args[0]) {
+		o.traceName = &args[0]
+	} else {
+		tid := types.UID(args[0])
+		o.traceID = &tid
 	}
 
 	return nil