{ drv ? import ./shell.nix }:
let
  nixConfig = import <nix/config.nix>;
in
derivation (drv.drvAttrs // {
  name = "keep-env-hack-${drv.name}";

  origBuilder = drv.builder;
  builder = builtins.storePath nixConfig.shell;

  origSystem = drv.system;
  system = builtins.currentSystem;

  origPATH = drv.PATH or "";
  PATH = builtins.storePath nixConfig.coreutils;

  origArgs = drv.args;
  args = [ (builtins.toFile "keep-env-hack" ''
    env > $out
  '') ];
})