universedesktop: cleanup desktop definition

machines/universedesktop/desktop/emptty.nix

@@ -0,0 +1,33 @@
+{ config, pkgs, lib, ... }: let
+  empttyConf = pkgs.writeText "emptty-config" ''
+    TTY_NUMBER=7
+
+    WAYLAND_SESSIONS_PATH="${config.services.displayManager.sessionData.desktops}/share/wayland-sessions"
+  '';
+in {
+  services.displayManager = {
+    enable = true;
+    execCmd = "${pkgs.emptty}/bin/emptty -d";
+  };
+  systemd.services.display-manager = {
+    enable = true;
+    path = [pkgs.dwl];
+    serviceConfig = {
+      EnvironmentFile = empttyConf;
+      Type="idle";
+      TTYPath="/dev/tty7";
+      TTYReset="yes";
+      SendSIGHUP="yes";
+      KillMode="process";
+    };
+  };
+
+  security.pam.services = {
+    emptty.text = ''
+      auth	substack	sshd
+      account	include	sshd
+      password	substack	sshd
+      session	include sshd
+    '';
+  };
+}