nixos/moonlight-qt: add module (#537882)

nixos/doc/manual/release-notes/rl-2611.section.md

@@ -24,6 +24,8 @@
 
 - [tranquil](https://tangled.org/tranquil.farm/tranquil-pds) is an ATProto PDS (personal data server) implementation in Rust. A featureful, spec conscious and community driven alternative to the Bluesky reference implementation PDS. Available as [services.tranquil-pds](#opt-services.tranquil-pds.enable).
 
+- [Moonlight Qt](https://moonlight-stream.org/), a client for playing your PC games on almost any device. Available as [programs.moonlight-qt](#opt-programs.moonlight-qt.enable).
+
 - [scx_loader](https://github.com/sched-ext/scx-loader), a system daemon and DBus-based loader for sched_ext schedulers. `scxctl` is the command-line client for interacting with the loader, allowing users to switch schedulers, modes, and arguments dynamically. Available as [services.scx-loader](#opt-services.scx-loader.enable)
 
 - [tap](https://github.com/bluesky-social/indigo/tree/main/cmd/tap), an ATProtocol firehose synchronisation utility. Available as [services.tap](#opt-services.tap.enable).

nixos/modules/module-list.nix

@@ -268,6 +268,7 @@
   ./programs/mininet.nix
   ./programs/minipro.nix
   ./programs/miriway.nix
+  ./programs/moonlight-qt.nix
   ./programs/mosh.nix
   ./programs/mouse-actions.nix
   ./programs/msmtp.nix

nixos/modules/programs/moonlight-qt.nix

@@ -0,0 +1,39 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.programs.moonlight-qt;
+in
+{
+  options.programs.moonlight-qt = {
+    enable = lib.mkEnableOption "Moonlight Qt, a client for playing your PC games on almost any device";
+
+    package = lib.mkPackageOption pkgs "moonlight-qt" { };
+
+    capSysNice = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = ''
+        Add the CAP_SYS_NICE capability to Moonlight Qt so that it may raise
+        its scheduling priority.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+
+    security.wrappers.moonlight = lib.mkIf cfg.capSysNice {
+      owner = "root";
+      group = "root";
+      source = lib.getExe cfg.package;
+      capabilities = "cap_sys_nice+ep";
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ aaravrav ];
+}

nixos/tests/sunshine.nix

@@ -40,9 +40,10 @@
         ./common/x11.nix
       ];
 
-      environment.systemPackages = with pkgs; [
-        moonlight-qt
-      ];
+      programs.moonlight-qt = {
+        enable = true;
+        capSysNice = true;
+      };
 
     };
 
@@ -52,6 +53,7 @@
     # start the tests, wait for sunshine to be up
     start_all()
     sunshine.wait_for_open_port(48010,"localhost")
+    moonlight.succeed("${pkgs.libcap}/bin/getcap \"$(command -v moonlight)\" | grep -q 'cap_sys_nice'")
 
     # set the admin username/password, restart sunshine
     sunshine.execute("sunshine --creds sunshine sunshine")