nixpkgs/pkgs/development/tools/puppet/puppet-lint/gemset.nix

{
  puppet-lint = {
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "1wyk2l440d96ps3x127r52n51kqpqi2nzb3xlg92qn6aksqhnkis";
      type = "gem";
    };
    version = "2.3.6";
  };
}