nixos/greetd: avoid systemd boot messages interrupt greetd (#433962)

nixos/modules/services/display-managers/greetd.nix

@@ -59,6 +59,16 @@ in
         because every greetd restart will trigger the autologin again.
       '';
     };
+
+    useTextGreeter = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = ''
+        Whether the greeter uses text-based user interfaces (For example, tuigreet).
+
+        When set to true, some systemd service configuration will be adjusted to avoid systemd boot messages interrupt TUI.
+      '';
+    };
   };
   config = lib.mkIf cfg.enable {
 
@@ -108,7 +118,19 @@ in
         KeyringMode = "shared";
 
         Type = "idle";
-      };
+      }
+      // (lib.optionalAttrs cfg.useTextGreeter {
+        StandardInput = "tty";
+        StandardOutput = "tty";
+        # Without this errors will spam on screen
+        StandardError = "journal";
+
+        # Without these bootlogs will spam on screen
+        TTYPath = "/dev/tty1";
+        TTYReset = true;
+        TTYVHangup = true;
+        TTYVTDisallocate = true;
+      });
 
       # Don't kill a user session when using nixos-rebuild
       restartIfChanged = false;