Gemfile.lock

default.nix

with (import <nixpkgs> {});
let
  gems = bundlerEnv {
    name = "slingshot";
    inherit ruby;
    gemdir = ./.;
  };
in stdenv.mkDerivation {
  name = "slingshot";
  buildInputs = [gems ruby curl];
}

Gemfile

source 'https://rubygems.org'

gem 'curb'

gistfile1.txt

GEM
  remote: https://rubygems.org/
  specs:
    curb (0.9.3)

PLATFORMS
  ruby

DEPENDENCIES
  curb

BUNDLED WITH
   1.15.3

gistfile2.txt

{
  curb = {
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "02g00fj14fvk2dmlabcm2sysz2fkhnr10fbkrjwkza8jyw2isra2";
      type = "gem";
    };
    version = "0.9.3";
  };
}