anchor.diff:        '';
       };
   
  -    # Copied from cage:
  -    # this needs a fairly recent kernel, otherwise:
  -    #   [backend/drm/util.c:215] Unable to add DRM framebuffer: No such file or directory
  -    #   [backend/drm/legacy.c:15] Virtual-1: Failed to set CRTC: No such file or directory
  -    #   [backend/drm/util.c:215] Unable to add DRM framebuffer: No such file or directory
  -    #   [backend/drm/legacy.c:15] Virtual-1: Failed to set CRTC: No such file or directory
  -    #   [backend/drm/drm.c:618] Failed to initialize renderer on connector 'Virtual-1': initial page-flip failed
  -    #   [backend/drm/drm.c:701] Failed to initialize renderer for plane
  -    boot.kernelPackages = pkgs.linuxPackages_latest;
  -
       virtualisation.memorySize = 1024;
  +    # Need to switch to a different VGA card / GPU driver than the default one (std) so that Cagebreak can launch:
  +    virtualisation.qemu.options = [ "-vga virtio" ];
     };
   
     enableOCR = true;
  
positive.code:   let
      alice = config.users.users.alice;
    in {
      imports = [ ./common/user-account.nix ];
  
      environment.systemPackages = [ pkgs.cagebreak pkgs.wallutils ];
      services.xserver = {
        enable = true;
        displayManager.autoLogin = {
          enable = true;
          user = alice.name;
        };
      };
      services.xserver.windowManager.session = lib.singleton {
        manage = "desktop";
        name = "cagebreak";
        start = ''
          export XDG_RUNTIME_DIR="/run/user/${toString alice.uid}"
          ${pkgs.cagebreak}/bin/cagebreak &
          waitPID=$!
        '';
      };
  
      systemd.services.setupCagebreakConfig = {
        wantedBy = [ "multi-user.target" ];
  
negative.code:   in ''
      start_all()
      machine.wait_for_unit("multi-user.target")
      machine.wait_until_tty_matches(1, "alice\@machine")
      machine.send_chars("cagebreak\n")
      machine.wait_for_file("${XDG_RUNTIME_DIR}/wayland-0")
  
      with subtest("ensure wayland works with wayinfo from wallutils"):
          print(machine.succeed("env XDG_RUNTIME_DIR=${XDG_RUNTIME_DIR} wayinfo"))
  
      # TODO: Fix the XWayland test (log the cagebreak output to debug):
      # with subtest("ensure xwayland works with xterm"):
      #     machine.send_key("ctrl-t")
      #     machine.send_key("t")
      #     machine.wait_until_succeeds("pgrep xterm")
      #     machine.wait_for_text("${user.name}@machine")
      #     machine.screenshot("screen")
      #     machine.send_key("ctrl-d")
    '';
  })
  