bake: make error clearer

bake/tree.go

@@ -63,7 +63,7 @@ func (ot *OptTree) AddCommand(name, descName, description string) (*getoptions.G
 		if len(keys) == i+1 {
 			desc = description
 		}
-		err := validateCmdName(key)
+		err := validateCmdName(key, descName)
 		if err != nil {
 			return nil, err
 		}
@@ -118,10 +118,10 @@ var golangKeywords = map[string]struct{}{
 	"var":         struct{}{},
 }
 
-func validateCmdName(name string) error {
+func validateCmdName(name, descName string) error {
 	// if command name matches a golang keyword, return an error
 	if _, ok := golangKeywords[name]; ok {
-		return fmt.Errorf("command name '%s' is a golang keyword", name)
+		return fmt.Errorf("command name '%s' in '%s' is a golang keyword", name, descName)
 	}
 	return nil
 }