diff --git a/nixops/light.nix b/nixops/light.nix
index 55a9f54..73f5563 100644
--- a/nixops/light.nix
+++ b/nixops/light.nix
@@ -1,6 +1,9 @@
 { host }:
 
 { config, pkgs, ... }:
+let
+  m-labs = import (fetchTarball https://nixbld.m-labs.hk/channel/custom/artiq/full/artiq-full/nixexprs.tar.xz) { inherit pkgs; };
+in
 {
   deployment.targetHost = host;
   nix.nixPath = [ "nixpkgs=${pkgs.path}" ];
@@ -112,6 +115,8 @@
   users.extraUsers = import ./common-users.nix { inherit pkgs; };
   
   security.sudo.wheelNeedsPassword = false;
+  services.udev.packages = [ m-labs.openocd ];
+  services.udev.extraRules = (import ./extra-udev.nix);
 
   nix.binaryCachePublicKeys = ["nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc="];
   nix.binaryCaches = ["https://nixbld.m-labs.hk" "https://cache.nixos.org"];