# Realizes <num>> of derivations with size of <size>MB
{
  size ? 1, # MB
  num ? 10, # count
  currentTime ? builtins.currentTime,
  noChroot ? false,
}:
with import <nixpkgs> {}; let
  drv = i:
    runCommand "${toString currentTime}-${toString i}" {
      __noChroot = noChroot;
    } ''
      dd if=/dev/zero of=$out bs=${toString size}MB count=1
    '';
in
  writeText "empty-${toString num}-${toString size}MB" ''
    ${lib.concatMapStringsSep "" drv (lib.range 1 num)}
  ''