nixos/hardware/hackrf: new module

This is a very this module to enable the
hackrf udev rules and ensure the "plugdev"
group they use exists.

nixos/modules/hardware/hackrf.nix

@@ -0,0 +1,23 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.hardware.hackrf;
+
+in
+{
+  options.hardware.hackrf = {
+    enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = ''
+        Enables hackrf udev rules and ensures 'plugdev' group exists.
+        This is a prerequisite to using HackRF devices without being root, since HackRF USB descriptors will be owned by plugdev through udev.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.udev.packages = [ pkgs.hackrf ];
+    users.groups.plugdev = { };
+  };
+}

nixos/modules/module-list.nix

@@ -53,6 +53,7 @@
   ./hardware/flirc.nix
   ./hardware/gpgsmartcards.nix
   ./hardware/i2c.nix
+  ./hardware/hackrf.nix
   ./hardware/sensor/hddtemp.nix
   ./hardware/sensor/iio.nix
   ./hardware/keyboard/teck.nix