it's qbit now

modules/qbittorrent.nix

@@ -0,0 +1,114 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.services.qbittorrent;
+  configDir = "${cfg.dataDir}/.config";
+  openFilesLimit = 4096;
+in
+{
+  options.services.qbittorrent = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Run qBittorrent headlessly as systemwide daemon
+      '';
+    };
+
+    dataDir = mkOption {
+      type = types.path;
+      default = "/var/lib/qbittorrent";
+      description = ''
+        The directory where qBittorrent will create files.
+      '';
+    };
+
+    user = mkOption {
+      type = types.str;
+      default = "qbittorrent";
+      description = ''
+        User account under which qBittorrent runs.
+      '';
+    };
+
+    group = mkOption {
+      type = types.str;
+      default = "qbittorrent";
+      description = ''
+        Group under which qBittorrent runs.
+      '';
+    };
+
+    port = mkOption {
+      type = types.port;
+      default = 8080;
+      description = ''
+        qBittorrent web UI port.
+      '';
+    };
+
+    openFirewall = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Open services.qBittorrent.port to the outside network.
+      '';
+    };
+
+    openFilesLimit = mkOption {
+      default = openFilesLimit;
+      description = ''
+        Number of files to allow qBittorrent to open.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = [ pkgs.qbittorrent ];
+
+    nixpkgs.overlays = [
+      (final: prev: {
+        qbittorrent = prev.qbittorrent.override { guiSupport = false; };
+      })
+    ];
+
+    networking.firewall = mkIf cfg.openFirewall {
+      allowedTCPPorts = [ cfg.port ];
+      allowedUDPPorts = [ cfg.port ];
+    };
+
+    systemd.services.qbittorrent = {
+      after = [ "network.target" ];
+      description = "qBittorrent Daemon";
+      wantedBy = [ "multi-user.target" ];
+      path = [ pkgs.qbittorrent ];
+      serviceConfig = {
+        ExecStart = ''
+          ${pkgs.qbittorrent}/bin/qbittorrent-nox \
+            --profile=${configDir} \
+            --webui-port=${toString cfg.port}
+        '';
+        # To prevent "Quit & shutdown daemon" from working; we want systemd to
+        # manage it!
+        Restart = "on-success";
+        User = cfg.user;
+        Group = cfg.group;
+        UMask = "0002";
+        LimitNOFILE = cfg.openFilesLimit;
+      };
+    };
+
+    users.users = mkIf (cfg.user == "qbittorrent") {
+      qbittorrent = {
+        group = cfg.group;
+        home = cfg.dataDir;
+        createHome = true;
+        description = "qBittorrent Daemon user";
+      };
+    };
+
+    users.groups =
+      mkIf (cfg.group == "qbittorrent") { qbittorrent = { gid = null; }; };
+  };
+}