Merge pull request #1305 from giuseppe/kill-max-2-args

kill: requires max 2 arguments

Author: Mrunal Patel

kill.go

@@ -72,6 +72,9 @@ signal to the init process of the "ubuntu01" container:
 		if err := checkArgs(context, 1, minArgs); err != nil {
 			return err
 		}
+		if err := checkArgs(context, 2, maxArgs); err != nil {
+			return err
+		}
 		container, err := getContainer(context)
 		if err != nil {
 			return err

utils.go

@@ -13,6 +13,7 @@ import (
 const (
 	exactArgs = iota
 	minArgs
+	maxArgs
 )
 
 func checkArgs(context *cli.Context, expected, checkType int) error {
@@ -27,6 +28,10 @@ func checkArgs(context *cli.Context, expected, checkType int) error {
 		if context.NArg() < expected {
 			err = fmt.Errorf("%s: %q requires a minimum of %d argument(s)", os.Args[0], cmdName, expected)
 		}
+	case maxArgs:
+		if context.NArg() > expected {
+			err = fmt.Errorf("%s: %q requires a maximum of %d argument(s)", os.Args[0], cmdName, expected)
+		}
 	}
 
 	if err != nil {