added greetd greeter for niri

hosts/ti-clt-dsk01/configuration.nix

@@ -9,9 +9,9 @@
 
   settings = {
 		hostname = "ti-clt-dsk01";
-    display-manager = "cosmic-greeter";
+    display-manager = "greetd";
     desktop-environments = {
-      cosmic.enable = true;
+      cosmic.enable = false;
       hyprland.enable = false;
       gnome.enable = false;
       niri.enable = true;

modules/system/desktop-environments/cosmic.nix

@@ -19,7 +19,6 @@ in {
   # ];
 
   config = mkIf cfg.enable {
-    services.displayManager.cosmic-greeter.enable = true;
     services.desktopManager.cosmic.enable = true;
 
     environment.sessionVariables = {

modules/system/display-managers/default.nix

@@ -7,7 +7,7 @@ let
 in {
   options = {
     settings.display-manager = lib.mkOption {
-      type = lib.types.enum ["sddm" "cosmic-greeter" "gdm" "none"];  
+      type = lib.types.enum ["sddm" "cosmic-greeter" "gdm" "none" "greetd"];  
       description = ''
         Specify which display manager to use
       '';
@@ -18,5 +18,6 @@ in {
     ./sddm.nix
     ./cosmic-greeter.nix
     ./gdm.nix
+    ./greetd.nix
   ];
 }

modules/system/display-managers/greetd.nix

@@ -0,0 +1,35 @@
+{ lib, config, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.settings.display-manager;
+in {
+  config = mkIf (cfg == "greetd") {
+    # systemd.services.greetd = {
+    #   serviceConfig.Type = "idle";
+    #   # unitConfig.After = [ "docker.service" ];
+    # };
+
+    systemd.services.greetd.serviceConfig = {
+      Type = "idle";
+      StandardInput = "tty";
+      StandardOutput = "tty";
+      StandardError = "journal"; # Without this errors will spam on screen
+      # Without these bootlogs will spam on screen
+      TTYReset = true;
+      TTYVHangup = true;
+      TTYVTDisallocate = true;
+    };
+
+    services.greetd = {
+      enable = true;
+      settings = {
+        default_session = {
+          command = "${pkgs.greetd.tuigreet}/bin/tuigreet --time --cmd niri-session";
+          user = "greeter";
+        };
+      };
+    };
+  };
+}