{
  system,
  configuration,
}:
let
  sources = import ../../../npins;
  os = import "${sources.nixpkgs}/nixos" {
    # os = import <nixpkgs/nixos> {
    inherit system configuration;
    # system = "${local.system}";
    # configuration =
    #   ${var.config_nix} //
    #   # template parameters passed in from TF thru json
    #   builtins.fromJSON "${replace(jsonencode(var.config_tf), "\"", "\\\"")}" //
    #   {
    #     # nix path for debugging
    #     nix.nixPath = [ "${local.nix_path}" ];
    #   };
  };
in
# info we want to get back out
{
  substituters = builtins.concatStringsSep " " os.config.nix.settings.substituters;
  trusted_public_keys = builtins.concatStringsSep " " os.config.nix.settings.trusted-public-keys;
  drv_path = os.config.system.build.toplevel.drvPath;
  out_path = os.config.system.build.toplevel;
}