Kde/sddm: change background

roles/kde/sddm.nix

@@ -1,10 +1,8 @@
 {
-  config,
+  lib,
   pkgs,
   ...
 }: let
-  currentTheme = config.services.displayManager.sddm.theme;
-
   sddm-sugar-candy = pkgs.stdenv.mkDerivation {
     pname = "sddm-sugar-candy";
     version = "master";
@@ -30,13 +28,18 @@
   customcfg = pkgs.stdenv.mkDerivation {
     name = "sddm-theme-customizer";
     dontUnpack = true;
-    # TODO: generate theme.conf.user outside of installPhase
-    installPhase = ''
+    installPhase = let
+      config = lib.generators.toINI {} {
+        # Add the custom config here
+        General = {
+          background = "${pkgs.kdePackages.breeze}/share/wallpapers/Next/contents/images_dark/5120x2880.png";
+        };
+      };
+    in ''
       runHook preInstall
 
-      mkdir -p $out/share/sddm/themes/${currentTheme}/
-      echo "[General]
-      background = ${pkgs.plasma-workspace-wallpapers}/share/wallpapers/MilkyWay/contents/images/5120x2880.png" >> $out/share/sddm/themes/${currentTheme}/theme.conf.user
+      mkdir -p $out/share/sddm/themes/breeze/
+      echo "${config}" >> $out/share/sddm/themes/breeze/theme.conf.user
 
       runHook postInstall
     '';
@@ -55,4 +58,5 @@ in {
 
   # Sugar candy doesn't seem to work on qt6 :(
   # environment.systemPackages = [sddm-sugar-candy customcfg];
+  environment.systemPackages = [customcfg];
 }