nixpkgs/nixos/tests/sway.nix

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

    # testScriptWithTypes:49: error: Cannot call function of unknown type
    #           (machine.succeed if succeed else machine.execute)(
    #           ^
    # Found 1 error in 1 file (checked 1 source file)
    skipTypeCheck = true;

    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;
            };
          };

          etc."gpg-agent.conf".text = ''
            pinentry-timeout 86400
          '';
        };

        fonts.packages = [ 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" ];
      };

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

        q = shlex.quote
        NODE_GROUPS = ["nodes", "floating_nodes"]


        def swaymsg(command: str = "", succeed=True, type="command"):
            assert command != "" or type != "command", "Must specify command or type"
            shell = q(f"swaymsg -t {q(type)} -- {q(command)}")
            with machine.nested(
                f"sending swaymsg {shell!r}" + " (allowed to fail)" * (not succeed)
            ):
                ret = (machine.succeed if succeed else machine.execute)(
                    f"su - alice -c {shell}"
                )

            # execute also returns a status code, but disregard.
            if not succeed:
                _, ret = ret

            if not succeed and not ret:
                return None

            parsed = json.loads(ret)
            return parsed


        def walk(tree):
            yield tree
            for group in NODE_GROUPS:
                for node in tree.get(group, []):
                    yield from walk(node)


        def wait_for_window(pattern):
            def func(last_chance):
                nodes = (node["name"] for node in walk(swaymsg(type="get_tree")))

                if last_chance:
                    nodes = list(nodes)
                    machine.log(f"Last call! Current list of windows: {nodes}")

                return any(pattern in name for name in nodes)

            retry(func)

        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= alacritty")
        wait_for_window("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")
        wait_for_window("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 mkdir -p ~/.gnupg")
        swaymsg("exec cp /etc/gpg-agent.conf ~/.gnupg")

        swaymsg("exec DISPLAY=INVALID gpg --no-tty --yes --quick-generate-key test", succeed=False)
        machine.wait_until_succeeds("pgrep --exact gpg")
        wait_for_window("gpg")
        machine.succeed("pgrep --exact gpg")
        machine.screenshot("gpg_pinentry")
        machine.send_key("alt-shift-q")
        machine.wait_until_fails("pgrep --exact gpg")

        # Test swaynag:
        def get_height():
            return [node['rect']['height'] for node in walk(swaymsg(type="get_tree")) if node['focused']][0]

        before = get_height()
        machine.send_key("alt-shift-e")
        retry(lambda _: get_height() < before)
        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")
      '';
  }
)