Merge pull request #310880 from presto8/warn-xss-lock

nixos/xss-lock: add warning for startx

nixos/modules/programs/xss-lock.nix

···
         ]);
       serviceConfig.Restart = "always";
     };
+
+    warnings = lib.mkIf (config.services.xserver.displayManager.startx.enable) [
+      "xss-lock service only works if a displayManager is set; it doesn't work when services.xserver.displayManager.startx.enable = true"
+    ];
+
   };
 }