nixos/plasma5: add very basic plasma-bigscreen module

nixos/modules/services/x11/desktop-managers/plasma5.nix

@@ -228,6 +228,14 @@ in
         is not strictly required for Plasma Mobile to run.
       '';
     };
+
+    bigscreen.enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = lib.mdDoc ''
+        Enable support for running the Plasma Bigscreen session.
+      '';
+    };
   };
 
   imports = [
@@ -237,7 +245,7 @@ in
 
   config = mkMerge [
     # Common Plasma dependencies
-    (mkIf (cfg.enable || cfg.mobile.enable) {
+    (mkIf (cfg.enable || cfg.mobile.enable || cfg.bigscreen.enable) {
 
       security.wrappers = {
         kscreenlocker_greet = {
@@ -595,5 +603,27 @@ in
 
       services.xserver.displayManager.sessionPackages = [ pkgs.libsForQt5.plasma5.plasma-mobile ];
     })
+
+    # Plasma Bigscreen
+    (mkIf cfg.bigscreen.enable {
+      environment.systemPackages =
+        with pkgs.plasma5Packages;
+        [
+          plasma-nano
+          plasma-settings
+          plasma-bigscreen
+          plasma-remotecontrollers
+
+          aura-browser
+          plank-player
+
+          plasma-pa
+          plasma-nm
+          kdeconnect-kde
+        ];
+
+      services.xserver.displayManager.sessionPackages = [ pkgs.plasma5Packages.plasma-bigscreen ];
+      services.udev.packages = [ pkgs.plasma5Packages.plasma-remotecontrollers ];
+    })
   ];
 }

nixos/tests/all-tests.nix

@@ -486,6 +486,7 @@ in {
   phylactery = handleTest ./web-apps/phylactery.nix {};
   pict-rs = handleTest ./pict-rs.nix {};
   pinnwand = handleTest ./pinnwand.nix {};
+  plasma-bigscreen = handleTest ./plasma-bigscreen.nix {};
   plasma5 = handleTest ./plasma5.nix {};
   plasma5-systemd-start = handleTest ./plasma5-systemd-start.nix {};
   plausible = handleTest ./plausible.nix {};

nixos/tests/plasma-bigscreen.nix

@@ -0,0 +1,36 @@
+import ./make-test-python.nix ({ pkgs, ...} :
+
+{
+  name = "plasma-bigscreen";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ ttuegel k900 ];
+  };
+
+  nodes.machine = { ... }:
+
+  {
+    imports = [ ./common/user-account.nix ];
+    services.xserver.enable = true;
+    services.xserver.displayManager.sddm.enable = true;
+    services.xserver.displayManager.defaultSession = "plasma-bigscreen-x11";
+    services.xserver.desktopManager.plasma5.bigscreen.enable = true;
+    services.xserver.displayManager.autoLogin = {
+      enable = true;
+      user = "alice";
+    };
+  };
+
+  testScript = { nodes, ... }: let
+    user = nodes.machine.users.users.alice;
+    xdo = "${pkgs.xdotool}/bin/xdotool";
+  in ''
+    with subtest("Wait for login"):
+        start_all()
+        machine.wait_for_file("${user.home}/.Xauthority")
+        machine.succeed("xauth merge ${user.home}/.Xauthority")
+
+    with subtest("Check plasmashell started"):
+        machine.wait_until_succeeds("pgrep plasmashell")
+        machine.wait_for_window("Plasma Big Screen")
+  '';
+})