usbmuxd service: init

nixos/modules/module-list.nix

···
   ./services/hardware/udev.nix
   ./services/hardware/udisks2.nix
   ./services/hardware/upower.nix
+  ./services/hardware/usbmuxd.nix
   ./services/hardware/thermald.nix
   ./services/logging/SystemdJournal2Gelf.nix
   ./services/logging/awstats.nix

nixos/modules/services/hardware/usbmuxd.nix

···
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  options.services.usbmuxd.enable = mkOption {
+    type = types.bool;
+    default = false;
+    description = ''
+      Enable the usbmuxd ("USB multiplexing daemon") service. This daemon is in
+      charge of multiplexing connections over USB to an iOS device. This is
+      needed for transferring data from and to iOS devices (see ifuse). Also
+      this may enable plug-n-play tethering for iPhones.
+    '';
+  };
+
+  config = mkIf config.services.usbmuxd.enable {
+    systemd.services.usbmuxd = {
+      description = "usbmuxd";
+      wantedBy = [ "multi-user.target" ];
+      unitConfig.Documentation = "man:usbmuxd(8)";
+      serviceConfig.ExecStart = "${pkgs.usbmuxd}/bin/usbmuxd -f";
+    };
+  };
+}