package main

import "os/user"

func lookupGroupNames(u *user.User) ([]string, error) {
	groups, err := u.GroupIds()
	if err != nil {
		return nil, err
	}

	var names []string

	for _, v := range groups {
		group, err := user.LookupGroupId(v)
		if err != nil {
			return nil, err
		}

		names = append(names, group.Name)
	}

	return names, nil
}