code: func getFileContent(fileArg string) (targetName string, b []byte, err error) {
  	var localFile string
  	files := strings.Split(fileArg, ":")
  	switch {
  	case len(files) < 1:
  		return "", nil, errors.New("empty `-files` parameter")
  	case len(files) == 1:
  		localFile = files[0]
  		targetName = files[0]
  	default:
  		localFile = files[0]
  		targetName = files[1]
  	}
  
  	b, err = ioutil.ReadFile(localFile)
  	return targetName, b, err
  }
docs: // getFileContent loads the local content of a file and return the target name
  // of the file in the target repository and its contents.