sunshine: hack steam big picture mode

nixosModules/services/sunshine.nix

@@ -1,18 +1,81 @@
-{pkgs, ...}: {
+{pkgs, ...}: let
+  steam-run-url = pkgs.writeShellApplication {
+    name = "steam-run-url";
+
+    runtimeInputs = [
+      pkgs.coreutils # For `id` commands
+    ];
+
+    text = ''
+      echo "$1" > "/run/user/$(id --user)/steam-run-url.fifo"
+    '';
+  };
+in {
   environment.systemPackages = with pkgs; [
     moonlight-qt
+    steam-run-url
   ];
 
   services = {
     sunshine = {
       enable = true;
+
+      applications = {
+        apps = [
+          {
+            auto-detach = "true";
+
+            detached = [
+              "${steam-run-url}/bin/steam-run-url steam://open/bigpicture"
+            ];
+
+            image-path = "steam.png";
+            name = "Steam - Big Picture Mode";
+            output = "steam.txt";
+          }
+        ];
+      };
+
+      autoStart = true;
       capSysAdmin = true;
       openFirewall = true;
-      autoStart = true;
     };
 
     udev.extraRules = ''
       KERNEL=="uinput", GROUP="input", MODE="0660" OPTIONS+="static_node=uinput"
     '';
   };
+
+  systemd.user.services = {
+    steam-run-url-service = {
+      enable = true;
+      after = ["graphical-session.target"];
+      description = "Listen and starts steam games by id.";
+      partOf = ["graphical-session.target"];
+      path = [pkgs.steam];
+
+      script = toString (pkgs.writers.writePython3 "steam-run-url-service" {} ''
+        import os
+        from pathlib import Path
+        import subprocess
+
+        pipe_path = Path(f'/run/user/{os.getuid()}/steam-run-url.fifo')
+        try:
+            pipe_path.parent.mkdir(parents=True, exist_ok=True)
+            pipe_path.unlink(missing_ok=True)
+            os.mkfifo(pipe_path, 0o600)
+            while True:
+                with pipe_path.open(encoding='utf-8') as pipe:
+                    subprocess.Popen(['steam', pipe.read().strip()])
+        finally:
+            pipe_path.unlink(missing_ok=True)
+      '');
+
+      serviceConfig.Restart = "on-failure";
+      wantedBy = ["graphical-session.target"];
+      wants = ["graphical-session.target"];
+    };
+
+    sunshine.path = [steam-run-url];
+  };
 }