selkies: browser game streaming for GW (pointer-lock relative mouse), retire neko

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/selkies.nix

@@ -0,0 +1,85 @@
+# services/selkies.nix — Guild Wars in a browser via Selkies
+#
+# Replaces the Neko attempt (services/neko.nix, now unimported): Neko's
+# absolute-pointer input model can't handle Guild Wars' exclusive mouse grab.
+# Selkies captures the mouse client-side with the browser Pointer Lock API and
+# sends *relative* movement, so the grab is a non-issue — and it uses the GPU
+# (NVENC + EGL) instead of software rendering.
+#
+# Reach it at selkies.nordhammer.it (Authelia-gated). The Wine prefix with
+# Guild Wars already installed is reused from the old Neko home, seeded into
+# /var/lib/selkies/home/.wine (see the deploy note in the repo).
+{ config, pkgs, lib, ... }:
+let
+  # Selkies' NVIDIA EGL desktop (Ubuntu 24.04) plus Wine for the 32-bit GW
+  # client. Built from stdin (no build context); see neko.nix for the why.
+  dockerfile = pkgs.writeText "selkies-gw.Dockerfile" ''
+    FROM ghcr.io/selkies-project/nvidia-egl-desktop:24.04
+    USER root
+    RUN add-apt-repository -y multiverse \
+     && dpkg --add-architecture i386 \
+     && apt-get update \
+     && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+          wine wine32 wine64 winbind cabextract ca-certificates wget \
+     && rm -rf /var/lib/apt/lists/*
+    USER 1000
+  '';
+in
+{
+  config = lib.mkIf (config.networking.hostName == "FredOS-Mediaserver") {
+
+    virtualisation.docker.enable = true;
+    # GPU into the container (CDI: nvidia.com/gpu=all) + 32-bit host GL libs so
+    # the toolkit can expose them to the 32-bit Wine/GW OpenGL stack.
+    hardware.nvidia-container-toolkit.enable = true;
+    hardware.graphics.enable32Bit = true;
+
+    systemd.tmpfiles.rules = [
+      "d /var/lib/selkies      0755 root root -"
+      # Container user is uid/gid 1000 and must own its home.
+      "d /var/lib/selkies/home 0755 1000 1000 -"
+    ];
+
+    systemd.services.selkies = {
+      description = "Selkies — Guild Wars in a browser (EGL desktop + Wine + NVENC)";
+      after = [ "docker.service" "network-online.target" ];
+      requires = [ "docker.service" ];
+      wants = [ "network-online.target" ];
+      wantedBy = [ "multi-user.target" ];
+
+      startLimitIntervalSec = 600;
+      startLimitBurst = 3;
+
+      serviceConfig = {
+        Restart = "on-failure";
+        RestartSec = "30s";
+        TimeoutStartSec = "3600";
+        ExecStartPre = [
+          "-${pkgs.docker}/bin/docker rm -f selkies"
+          "${pkgs.writeShellScript "selkies-build" ''
+            exec ${pkgs.docker}/bin/docker build -t selkies-gw:local - < ${dockerfile}
+          ''}"
+        ];
+        ExecStart = pkgs.writeShellScript "selkies-run" ''
+          exec ${pkgs.docker}/bin/docker run --rm --name selkies \
+            --device=nvidia.com/gpu=all \
+            -e NVIDIA_VISIBLE_DEVICES=all \
+            -e NVIDIA_DRIVER_CAPABILITIES=all \
+            --shm-size=2g \
+            -p 127.0.0.1:8093:8080 \
+            -e TZ=Europe/Stockholm \
+            -e DISPLAY_SIZEW=1280 -e DISPLAY_SIZEH=720 \
+            -e DISPLAY_REFRESH=30 -e DISPLAY_DPI=96 -e DISPLAY_CDEPTH=24 \
+            -e PASSWD=selkies \
+            -e SELKIES_ENCODER=nvh264enc \
+            -e SELKIES_VIDEO_BITRATE=8000 \
+            -e SELKIES_FRAMERATE=30 \
+            -e SELKIES_ENABLE_BASIC_AUTH=false \
+            -v /var/lib/selkies/home:/home/ubuntu \
+            selkies-gw:local
+        '';
+        ExecStop = "${pkgs.docker}/bin/docker stop selkies";
+      };
+    };
+  };
+}