anchor.diff:  
         systemd.services.docker = {
           wantedBy = optional cfg.enableOnBoot "multi-user.target";
  +        environment = proxy_env;
           serviceConfig = {
             ExecStart = [
               ""
  
positive.code: let
  
    cfg = config.virtualisation.docker;
    pro = config.networking.proxy.default;
    proxy_env = optionalAttrs (pro != null) { Environment = "\"http_proxy=${pro}\""; };
  
  in
  
  
negative.code:             ""
              "${pkgs.procps}/bin/kill -s HUP $MAINPID"
            ];
          };
  
          path = [ pkgs.kmod ] ++ (optional (cfg.storageDriver == "zfs") pkgs.zfs);
        };
  