{ lib, stdenv, util-linux, coreutils, fetchurl, groff, system-sendmail }:

stdenv.mkDerivation rec {
  name = "mdadm-4.1";

  src = fetchurl {
    url = "mirror://kernel/linux/utils/raid/mdadm/${name}.tar.xz";
    sha256 = "0jjgjgqijpdp7ijh8slzzjjw690kydb1jjadf0x5ilq85628hxmb";
  };

  patches = [ ./no-self-references.patch ];

  makeFlags = [
    "NIXOS=1" "INSTALL=install" "BINDIR=$(out)/sbin"
    "SYSTEMD_DIR=$(out)/lib/systemd/system"
    "MANDIR=$(out)/share/man" "RUN_DIR=/dev/.mdadm"
    "STRIP="
  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
    "CROSS_COMPILE=${stdenv.cc.targetPrefix}"
  ];

  installFlags = [ "install-systemd" ];

  enableParallelBuilding = true;

  nativeBuildInputs = [ groff ];

  postPatch = ''
    sed -e 's@/lib/udev@''${out}/lib/udev@' \
        -e 's@ -Werror @ @' \
        -e 's@/usr/sbin/sendmail@${system-sendmail}/bin/sendmail@' -i Makefile
    sed -i \
        -e 's@/usr/bin/basename@${coreutils}/bin/basename@g' \
        -e 's@BINDIR/blkid@${util-linux}/bin/blkid@g' \
        *.rules
  '';

  # This is to avoid self-references, which causes the initrd to explode
  # in size and in turn prevents mdraid systems from booting.
  postFixup = ''
    grep -r $out $out/bin && false || true
  '';

  meta = with lib; {
    description = "Programs for managing RAID arrays under Linux";
    homepage = "http://neil.brown.name/blog/mdadm";
    license = licenses.gpl2;
    maintainers = with maintainers; [ ekleog ];
    platforms = platforms.linux;
  };
}