From fab93a5f2fec32f87c2ed0c759775a2d9205f8cc Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Sun, 9 May 2021 12:14:50 +0200
Subject: [PATCH] modules: users: simplify 'groupsIfExist'

---
 modules/users.nix | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/modules/users.nix b/modules/users.nix
index 3bc1c37..15896e0 100644
--- a/modules/users.nix
+++ b/modules/users.nix
@@ -2,11 +2,8 @@
 { config, lib, pkgs, ... }:
 let
   my = config.my;
-  groupIfExists = grp:
-    lib.lists.optional
-      (builtins.hasAttr grp config.users.groups)
-      grp;
-  groupsIfExist = builtins.concatMap groupIfExists;
+  groupExists = grp: builtins.hasAttr grp config.users.groups;
+  groupsIfExist = builtins.filter groupExists;
 in
 {
   users.mutableUsers = false; # I want it to be declarative.