{ lib, stdenv, fetchgit, fetchurl, fetchpatch, nasm, perl, python3, libuuid, mtools, makeWrapper }:

stdenv.mkDerivation {
  pname = "syslinux";
  version = "unstable-20190207";

  # This is syslinux-6.04-pre3^1; syslinux-6.04-pre3 fails to run.
  # Same issue here https://www.syslinux.org/archives/2019-February/026330.html
  src = fetchgit {
    url = "https://repo.or.cz/syslinux";
    rev = "b40487005223a78c3bb4c300ef6c436b3f6ec1f7";
    sha256 = "1acf6byx7i6vz8hq6mra526g8mf7fmfhid211y8nq0v6px7d3aqs";
    fetchSubmodules = true;
  };

  patches = let
    mkURL = commit: patchName:
      "https://salsa.debian.org/images-team/syslinux/raw/${commit}/debian/patches/"
      + patchName;
  in [
    (fetchurl {
      url = mkURL "fa1349f1" "0002-gfxboot-menu-label.patch";
      sha256 = "06ifgzbpjj4picpj17zgprsfi501zf4pp85qjjgn29i5rs291zni";
    })
    (fetchurl {
      url = "https://raw.githubusercontent.com/archlinux/svntogit-packages/821c3da473d1399d930d5b4a086e46a4179eaa45/trunk/0005-gnu-efi-version-compatibility.patch";
      name = "0005-gnu-efi-version-compatibility.patch";
      sha256 = "1mz2idg8cwn0mvd3jixxynhkn7rhmi5fp8cc8zznh5f0ysfra446";
    })
    (fetchurl {
      url = "https://raw.githubusercontent.com/archlinux/svntogit-packages/821c3da473d1399d930d5b4a086e46a4179eaa45/trunk/0025-reproducible-build.patch";
      name = "0025-reproducible-build.patch";
      sha256 = "0qk6wc6z3648828y3961pn4pi7xhd20a6fqn6z1mnj22bbvzcxls";
    })
    (fetchurl {
      # mbr.bin: too big (452 > 440)
      # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=906414
      url = mkURL "7468ef0e38c43" "0016-strip-gnu-property.patch";
      sha256 = "17n63b8wz6szv8npla1234g1ip7lqgzx2whrpv358ppf67lq8vwm";
    })
    (fetchurl {
      # mbr.bin: too big (452 > 440)
      url = mkURL "012e1dd312eb" "0017-single-load-segment.patch";
      sha256 = "0azqzicsjw47b9ppyikhzaqmjl4lrvkxris1356bkmgcaiv6d98b";
    })
    (fetchurl {
      url = mkURL "26f0e7b2" "0018-prevent-pow-optimization.patch";
      sha256 = "1c8g0jz5yj9a0rsmryx9vdjsw4hw8mjfcg05c9pmyjg85w3dfp3m";
    })
    ./gcc10.patch
  ];

  postPatch = ''
    substituteInPlace Makefile --replace /bin/pwd $(type -P pwd)
    substituteInPlace utils/ppmtolss16 --replace /usr/bin/perl $(type -P perl)

    # fix tests
    substituteInPlace tests/unittest/include/unittest/unittest.h \
      --replace /usr/include/ ""

    # Hack to get `gcc -m32' to work without having 32-bit Glibc headers.
    mkdir gnu-efi/inc/ia32/gnu
    touch gnu-efi/inc/ia32/gnu/stubs-32.h
  '';

  nativeBuildInputs = [ nasm perl python3 makeWrapper ];
  buildInputs = [ libuuid ];

  enableParallelBuilding = false; # Fails very rarely with 'No rule to make target: ...'
  hardeningDisable = [ "pic" "stackprotector" "fortify" ];

  stripDebugList = [ "bin" "sbin" "share/syslinux/com32" ];

  makeFlags = [
    "BINDIR=$(out)/bin"
    "SBINDIR=$(out)/sbin"
    "DATADIR=$(out)/share"
    "MANDIR=$(out)/share/man"
    "PERL=perl"
    "HEXDATE=0x00000000"
  ]
    ++ lib.optionals stdenv.hostPlatform.isi686 [ "bios" "efi32" ];

  doCheck = false; # fails. some fail in a sandbox, others require qemu

  postInstall = ''
    wrapProgram $out/bin/syslinux \
      --prefix PATH : "${mtools}/bin"

    # Delete com32 headers to save space, nobody seems to be using them
    rm -rf $out/share/syslinux/com32
  '';

  meta = with lib; {
    homepage = "http://www.syslinux.org/";
    description = "A lightweight bootloader";
    license = licenses.gpl2;
    maintainers = [ maintainers.samueldr ];
    platforms = [ "i686-linux" "x86_64-linux" ];
  };
}