nomicon/nixos/tests/sway.nix

import ./make-test-python.nix ({ pkgs, lib, ... }: {
  name = "sway";
  meta = {
    maintainers = with lib.maintainers; [ primeos synthetica ];
  };

  nodes.machine = { config, ... }: {
    # Automatically login on tty1 as a normal user:
    imports = [ ./common/user-account.nix ];
    services.getty.autologinUser = "alice";

    environment = {
      # For glinfo and wayland-info:
      systemPackages = with pkgs; [ mesa-demos wayland-utils alacritty ];
      # Use a fixed SWAYSOCK path (for swaymsg):
      variables = {
        "SWAYSOCK" = "/tmp/sway-ipc.sock";
        # TODO: Investigate if we can get hardware acceleration to work (via
        # virtio-gpu and Virgil). We currently have to use the Pixman software
        # renderer since the GLES2 renderer doesn't work inside the VM (even
        # with WLR_RENDERER_ALLOW_SOFTWARE):
        # "WLR_RENDERER_ALLOW_SOFTWARE" = "1";
        "WLR_RENDERER" = "pixman";
      };
      # For convenience:
      shellAliases = {
        test-x11 = "glinfo | tee /tmp/test-x11.out && touch /tmp/test-x11-exit-ok";
        test-wayland = "wayland-info | tee /tmp/test-wayland.out && touch /tmp/test-wayland-exit-ok";
      };

      # To help with OCR:
      etc."xdg/foot/foot.ini".text = lib.generators.toINI { } {
        main = {
          font = "inconsolata:size=14";
        };
        colors = rec {
          foreground = "000000";
          background = "ffffff";
          regular2 = foreground;
        };
      };
    };

    fonts.fonts = [ pkgs.inconsolata ];

    # Automatically configure and start Sway when logging in on tty1:
    programs.bash.loginShellInit = ''
      if [ "$(tty)" = "/dev/tty1" ]; then
        set -e

        mkdir -p ~/.config/sway
        sed s/Mod4/Mod1/ /etc/sway/config > ~/.config/sway/config

        sway --validate
        sway && touch /tmp/sway-exit-ok
      fi
    '';

    programs.sway.enable = true;

    # To test pinentry via gpg-agent:
    programs.gnupg.agent.enable = true;

    # Need to switch to a different GPU driver than the default one (-vga std) so that Sway can launch:
    virtualisation.qemu.options = [ "-vga none -device virtio-gpu-pci" ];
  };

  enableOCR = true;

  testScript = { nodes, ... }: ''
    import shlex

    def swaymsg(command: str, succeed=True):
        with machine.nested(f"sending swaymsg {command!r}" + " (allowed to fail)" * (not succeed)):
          (machine.succeed if succeed else machine.execute)(
            f"su - alice -c {shlex.quote('swaymsg -- ' + command)}"
          )

    start_all()
    machine.wait_for_unit("multi-user.target")

    # To check the version:
    print(machine.succeed("sway --version"))

    # Wait for Sway to complete startup:
    machine.wait_for_file("/run/user/1000/wayland-1")
    machine.wait_for_file("/tmp/sway-ipc.sock")

    # Test XWayland (foot does not support X):
    swaymsg("exec WINIT_UNIX_BACKEND=x11 WAYLAND_DISPLAY=invalid alacritty")
    machine.wait_for_text("alice@machine")
    machine.send_chars("test-x11\n")
    machine.wait_for_file("/tmp/test-x11-exit-ok")
    print(machine.succeed("cat /tmp/test-x11.out"))
    machine.copy_from_vm("/tmp/test-x11.out")
    machine.screenshot("alacritty_glinfo")
    machine.succeed("pkill alacritty")

    # Start a terminal (foot) on workspace 3:
    machine.send_key("alt-3")
    machine.sleep(3)
    machine.send_key("alt-ret")
    machine.wait_for_text("alice@machine")
    machine.send_chars("test-wayland\n")
    machine.wait_for_file("/tmp/test-wayland-exit-ok")
    print(machine.succeed("cat /tmp/test-wayland.out"))
    machine.copy_from_vm("/tmp/test-wayland.out")
    machine.screenshot("foot_wayland_info")
    machine.send_key("alt-shift-q")
    machine.wait_until_fails("pgrep foot")

    # Test gpg-agent starting pinentry-gnome3 via D-Bus (tests if
    # $WAYLAND_DISPLAY is correctly imported into the D-Bus user env):
    swaymsg("exec gpg --no-tty --yes --quick-generate-key test")
    machine.wait_until_succeeds("pgrep --exact gpg")
    machine.wait_for_text("Passphrase")
    machine.screenshot("gpg_pinentry")
    machine.send_key("alt-shift-q")
    machine.wait_until_fails("pgrep --exact gpg")

    # Test swaynag:
    machine.send_key("alt-shift-e")
    machine.wait_for_text("You pressed the exit shortcut.")
    machine.screenshot("sway_exit")

    swaymsg("exec swaylock")
    machine.wait_until_succeeds("pgrep -x swaylock")
    machine.sleep(3)
    machine.send_chars("${nodes.machine.config.users.users.alice.password}")
    machine.send_key("ret")
    machine.wait_until_fails("pgrep -x swaylock")

    # Exit Sway and verify process exit status 0:
    swaymsg("exit", succeed=False)
    machine.wait_until_fails("pgrep -x sway")
    machine.wait_for_file("/tmp/sway-exit-ok")
  '';
})