code: func cfgOpt(cfg *conf.ConfigFile, section, option string) string {
  	if !cfg.HasOption(section, option) {
  		return ""
  	}
  	s, err := cfg.GetString(section, option)
  	if err != nil {
  		log.Exitf("Failed to get %s for %s: %v", option, section, err)
  	}
  	return s
  }
docs: // cfgOpt returns the configuration option from the specified section. If the
  // option does not exist an empty string is returned.