feat: use cfg.headless parameter to conditionally enable stylix, DM,

DE/WM

users/default.nix

@@ -82,7 +82,7 @@ lib.foldl' (acc: obj: lib.recursiveUpdate acc obj) { } (
 
           inputs.stylix.homeModules.stylix
         ];
-        stylix = {
+        stylix = lib.mkIf (!cfg.headless) {
           enable = true;
           image =
             if builtins.pathExists ./${user}/wallpaper.png then
@@ -95,10 +95,13 @@ lib.foldl' (acc: obj: lib.recursiveUpdate acc obj) { } (
     }) cfg.usersList)
 
     # Configure DM and users' default sessions
-    {
+    (lib.optionalAttrs (!cfg.headless) {
       services.displayManager.gdm.enable = true;
-    }
-    (map (user: {
+    })
+
+    (map (
+      user:
+      lib.optionalAttrs (!cfg.headless) {
         systemd.tmpfiles.settings."20-gdm-default-session" = {
           "/run/tmpfiles/var/lib/AccountsService/users/${user}".f = {
             argument = "${lib.generators.toINI { } {
@@ -122,9 +125,12 @@ lib.foldl' (acc: obj: lib.recursiveUpdate acc obj) { } (
             argument = "/run/tmpfiles/var/lib/AccountsService/users/${user}";
           };
         };
-    }) cfg.usersList)
+      }
+    ) cfg.usersList)
+
     (map (
       user:
+      lib.optionalAttrs (!cfg.headless) (
         let
           __session = lib.splitString ":" (builtins.fromJSON (builtins.readFile ./${user}/about.json))
           .session;
@@ -140,6 +146,7 @@ lib.foldl' (acc: obj: lib.recursiveUpdate acc obj) { } (
           { services.desktopManager.${session}.enable = true; }
         else
           { }
+      )
     ) cfg.usersList)
   ]
 )