gistfile1.txt

drv: 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
    '') ];
  });