config.nix

{
  lib,
  config,
  pkgs,
  ...
}:
lib.recurseIntoAttrs {

  # https://github.com/NixOS/nixpkgs/issues/175196
  # This test has since been simplified to test the recursion without
  # the fluff to make it look like a real-world example.
  # The requirement we test here is:
  # - `permittedInsecurePackages` must be allowed to
  #   use `pkgs` to retrieve at least *some* information.
  #
  # Instead of `builtins.seq`, the list may be constructed based on actual package info.
  allowPkgsInPermittedInsecurePackages =
    let
      pkgs' = import ../.. {
        system = pkgs.stdenv.hostPlatform.system;
        config = config // {
          permittedInsecurePackages = builtins.seq pkgs'.glibc.version [ ];
        };
      };

    in
    pkgs'.hello;

}