From 5d4fd2fd9aa9a9a51a31c1d1f1cf40490ef29465 Mon Sep 17 00:00:00 2001
From: "Shahar \"Dawn\" Or" <mightyiampresence@gmail.com>
Date: Wed, 25 Jun 2025 21:47:39 +0700
Subject: [PATCH] nixos/cupsd: create lpadmin group and add it SystemGroups

Useful for giving users full admin permissions over printing.
---
 nixos/modules/services/printing/cupsd.nix | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/nixos/modules/services/printing/cupsd.nix b/nixos/modules/services/printing/cupsd.nix
index a0932f131ec4..9e1ab0abef4b 100644
--- a/nixos/modules/services/printing/cupsd.nix
+++ b/nixos/modules/services/printing/cupsd.nix
@@ -71,7 +71,7 @@ let
     };
 
   cupsFilesFile = writeConf "cups-files.conf" ''
-    SystemGroup root wheel
+    SystemGroup root wheel lpadmin
 
     ServerBin ${bindir}/lib/cups
     DataDir ${bindir}/share/cups
@@ -361,10 +361,15 @@ in
 
   config = mkIf config.services.printing.enable {
 
-    users.users.cups = {
-      uid = config.ids.uids.cups;
-      group = "lp";
-      description = "CUPS printing services";
+    users = {
+      users.cups = {
+        uid = config.ids.uids.cups;
+        group = "lp";
+        description = "CUPS printing services";
+      };
+
+      # It seems that groups provided for `SystemGroup` must exist
+      groups.lpadmin = { };
     };
 
     # We need xdg-open (part of xdg-utils) for the desktop-file to proper open the users default-browser when opening "Manage Printing"