darwin.file_cmds: migrate to use darwin.sourceRelease

{

  lib,

  apple-sdk,

  bzip2,

  copyfile,

  less,

  pkg-config,

  removefile,

  shell_cmds,

  pkgs,

  stdenvNoCC,

  xz,

  zlib,

}:

let

  Libc = apple-sdk.sourceRelease "Libc";

  Libinfo = apple-sdk.sourceRelease "Libinfo";

  CommonCrypto = apple-sdk.sourceRelease "CommonCrypto";

  libplatform = apple-sdk.sourceRelease "libplatform";

  xnu = apple-sdk.sourceRelease "xnu";

  f =

    pkgs: prev:

    if !pkgs.stdenv.hostPlatform.isDarwin || pkgs.stdenv.name == "bootstrap-stage0-stdenv-darwin" then

      prev.darwin.sourceRelease

    else

      f pkgs.stdenv.__bootPackages pkgs;

  bootstrapSourceRelease = f pkgs pkgs;

  # TODO(reckenrode): Use `sourceRelease` after migration has been merged and all releases updated to the same version.

  Libc = bootstrapSourceRelease "Libc";

  Libinfo = bootstrapSourceRelease "Libinfo";

  CommonCrypto = bootstrapSourceRelease "CommonCrypto";

  libplatform = bootstrapSourceRelease "libplatform";

  xnu = bootstrapSourceRelease "xnu";

  privateHeaders = stdenvNoCC.mkDerivation {

    name = "file_cmds-deps-private-headers";