Nix dockerTools.buildImage를 사용하여 Docker 이미지 빌드 - 빌드 스크립트에서 인터넷에 액세스할 수 없습니까?

여기에 설명된 대로 간단한 도커 이미지를 만들려고 합니다.http://lethalman.blogspot.com/2016/04/cheap-docker-images-with-nix_15.html, 하지만 빌드 단계에서는 네트워크/인터넷 액세스가 없는 것 같습니다. 이것이 제한 사항입니까? 해결책이 있나요?

{ pkgs ? import <nixpkgs> {} }:

with pkgs;
let
  entrypoint = writeScript "entrypoint.sh" ''
    #!${stdenv.shell}
    set -e
    exec "$@"
  '';
in
dockerTools.buildImage {
  name = "test";
  runAsRoot = ''
    #!${stdenv.shell}
    ${dockerTools.shadowSetup}
    curl google.com
  '';

  contents = [ busybox bash curl ];

  config = {
    Cmd = [ "bash" ];
    Entrypoint = [ entrypoint ];
    #ExposedPorts = {
      #"6379/tcp" = {};
    #};
    WorkingDir = "/data";
    #Volumes = {
      #"/data" = {};
    #};
  };
}

컬은 display 에서 실패합니다 curl: (6) Could not resolve host: google.com. (DNS를 피하기 위해) IP를 대신 사용할 때도 작동하지 않습니다. 전체 출력:

nix build --no-substitute
builder for '/nix/store/6md5l4lhk4kb5i8b3sp7w3q5v1nd83m2-docker-layer-test.drv' failed with exit code 6; last 10 log lines:
  Writing superblocks and filesystem accounting information: done

  Executing pre-mount steps...
  Adding contents...
  Adding /nix/store/xhwhakb1zcf5wl2a8575gcrnmbbqihm2-busybox-1.30.1...
  Adding /nix/store/rm1hz1lybxangc8sdl7xvzs5dcvigvf7-bash-4.4-p23...
  Adding /nix/store/a7i4hha4gh7fsbw7bfz51l2dkhgvb59a-curl-7.65.3-bin...
  Executing post-mount steps...
  curl: (6) Could not resolve host: google.com
  [    3.476402] reboot: Power down
cannot build derivation '/nix/store/k4dz6c5xv1p430wai75yigmmw8yn9kzy-docker-layer-test.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/pk4s3nzdv3kd2gxfqr72bimvvam7h469-docker-image-test.tar.gz.drv': 1 dependencies couldn't be built
[1 built (1 failed)]
error: build of '/nix/store/pk4s3nzdv3kd2gxfqr72bimvvam7h469-docker-image-test.tar.gz.drv' failed