You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: init.go
    path of file: ./repos/easegress/cmd/builder/command
    
    the code of the file until where you have to start completion: /*
 * Copyright (c) 2017, The Easegress Authors
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apac
    
func initArgs(cmd *cobra.Command, args []string) error {
	if len(args) != 0 {
		return errors.New("init takes no arguments")
	}
	if len(initConfig.Repo) == 0 {
		return errors.New("repo is required")
	}
	if (len(initConfig.Filters) == 0) && (len(initConfig.Controllers) == 0) {
		return errors.New("filters or controllers is required")
	}

	err := module.CheckPath(initConfig.Repo)
	if err != nil {
		return fmt.Errorf("repo %s is not a valid path, %s", initConfig.Repo, err.Error())
	}
	for _, filter := range initConfig.Filters {
		if !(utils.ExportableVariableName(filter)) {
			return fmt.Errorf("filter %s is not a valid golang variable name with first letter upper case", filter)
		}
	}
	for _, controller := range initConfig.Controllers {
		if !(utils.ExportableVariableName(controller)) {
			return fmt.Errorf("controller %s is not a valid golang variable name with first letter upper case", controller)
		}
	}
	return nil
}