nixos/kmonad: make sure new config is used after nixos-rebuild switch

          config.users.groups.uinput.name

        ] ++ keyboard.extraGroups;

      };

      # make sure the new config is used after nixos-rebuild switch

      # stopIfChanged controls[0] how a service is "restarted" during

      # nixos-rebuild switch.  By default, stopIfChanged is true, which stops

      # the old service and then starts the new service after config updates.

      # Since we use path-based activation[1] here, the service unit will

      # immediately[2] be started by the path unit.  Probably that start is

      # before config updates, whcih causes the service unit to use the old

      # config after nixos-rebuild switch.  Setting stopIfChanged to false works

      # around this issue by restarting the service after config updates.

      # [0]: https://nixos.org/manual/nixos/unstable/#sec-switching-systems

      # [1]: man 7 daemon

      # [2]: man 5 systemd.path

      stopIfChanged = false;

    };

in

{