lines = append(lines, fmt.Sprintf("%s{%d,%d};", k, e.id, e.gid))
	}
	sort.Strings(lines)
	return strings.Join(lines, "")
}

// AddUsersAndGroups is a public wrapper around addUsersAndGroupsImpl with default system file paths.
func AddUsersAndGroups() (*UsersAndGroups, error) {
	return addUsersAndGroupsImpl(fileEtcLoginDefs, fileEtcPasswd, fileEtcGroup)
}

// in a thread safe way once.
func GetUsersAndGroups() (*users.UsersAndGroups, error) {
	var err error
	usersAndGroupsOnce.Do(func() {
		usersAndGroups, err = users.AddUsersAndGroups()
	})
	return usersAndGroups, err
}

// DeepHashObject writes specified object to hash using the spew library
// which follows pointers and prints actual values of the nested objects