core/pkgs/build-support/fetchgx/default.nix

{
  stdenvNoCC,
  gx,
  gx-go,
  go,
  cacert,
}:

{
  name,
  src,
  sha256,
}:

stdenvNoCC.mkDerivation {
  name = "${name}-gxdeps";
  inherit src;

  nativeBuildInputs = [
    cacert
    go
    gx
    gx-go
  ];

  outputHashAlgo = "sha256";
  outputHashMode = "recursive";
  outputHash = sha256;

  dontConfigure = true;
  doCheck = false;
  doInstallCheck = false;

  buildPhase = ''
    export GOPATH=$(pwd)/vendor
    mkdir -p vendor
    gx install
  '';

  installPhase = ''
    mv vendor $out
  '';

  preferLocalBuild = true;
}