// ID is a NO-OP on non-Linux.
func (*EntryMap) ID(string) *int64 {
	return nil
}

// String is NO-OP on non-Linux.
func (*EntryMap) String() string {
	return ""
}

// AddUsersAndGroups is a NO-OP on non-Linux.
func AddUsersAndGroups() (*UsersAndGroups, error) {
	return nil, nil
}

// RemoveUsersAndGroups is a NO-OP on non-Linux.
func RemoveUsersAndGroups() error {
	return nil
}

		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)
}

	defer close()
	fileGroup, close := writeTempFile(t, group)
	defer close()
	got, err := addUsersAndGroupsImpl(fileLoginDef, filePasswd, fileGroup)
	if err != nil {
		t.Fatalf("AddUsersAndGroups failed: %v", err)
	}
	if expectedUsers != got.Users.String() {
		t.Fatalf("expected users: %q, got: %q", expectedUsers, got.Users.String())
	}
	if expectedGroups != got.Groups.String() {

// 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