{ stdenv
, lib
, fetchFromGitHub
, fetchurl
, squashfsTools
, xz
}:

let freetz = fetchFromGitHub {
  owner = "Freetz";
  repo = "freetz";
  rev = "e1358ac97af47d2b8faa7237a89b353724f573b7";
  sha256 = "1k3l5n5hpzysj0n3fn1jazvrj89cxdf3bbz9jfzqccfi01vnhlsc";
};

in

stdenv.mkDerivation rec {
  pname = "squashfs-avm-be";
  version = "4.3";

  src = fetchurl {
    url = "mirror://sourceforge/squashfs/squashfs${version}.tar.gz";
    sha256 = "1xpklm0y43nd9i6jw43y2xh5zvlmj9ar2rvknh0bh7kv8c95aq0d";
  };

  prePatch = ''
    cd squashfs-tools
  '';

  patches = [
    "${freetz}/make/squashfs4-be/patches/001-de03266983ceb62e5365aac84fcd3b2fd4d16e6f.upstream.patch"
    "${freetz}/make/squashfs4-be/patches/002-4f24381e7edc0a46cf10278e4597051ac697ec7c.upstream.patch"
    "${freetz}/make/squashfs4-be/patches/010-fix_segfault_in_tracing_code.patch"
    "${freetz}/make/squashfs4-be/patches/050-freetz_specific_xz_paths.patch"
    "${freetz}/make/squashfs4-be/patches/060-link_compression_libs_statically.patch"
    "${freetz}/make/squashfs4-be/patches/100-TARGET_FORMAT.patch"
    "${freetz}/make/squashfs4-be/patches/101-TARGET_FORMAT__AVM_BE_AVM_LE_symbols_only.patch"
    "${freetz}/make/squashfs4-be/patches/200-help_comment_typos.patch"
    "${freetz}/make/squashfs4-be/patches/210-mksquashfs__uclibc_get_physical_memory.patch"
    "${freetz}/make/squashfs4-be/patches/220-mksquashfs__default_block_size.patch"
    "${freetz}/make/squashfs4-be/patches/230-mksquashfs__disable_xattrs_support.patch"
    "${freetz}/make/squashfs4-be/patches/240-mksquashfs__remove_append_mode_support.patch"
    "${freetz}/make/squashfs4-be/patches/250-mksquashfs__AVM_BE.patch"
    "${freetz}/make/squashfs4-be/patches/350-unsquashfs__AVM_BE.patch"
    "${freetz}/make/squashfs4-be/patches/400-unsquashfs123_lzma1_header_less.patch"
    "${freetz}/make/squashfs4-be/patches/410-unsquashfs123_optional.patch"
    "${freetz}/make/squashfs4-be/patches/450-unsquashfs__exit_on_error.patch"
    "${freetz}/make/squashfs4-be/patches/550-mkfs_time__AVM_BE_AVM_LE.patch"
    "${freetz}/make/squashfs4-be/patches/610-unsquashfs_superblock_offset.patch"
    "${freetz}/make/squashfs4-be/patches/611-unsquashfs_nmi_vector_gap.patch"
    "${freetz}/make/squashfs4-be/patches/612-ti_checksum.patch"
    "${freetz}/make/squashfs4-be/patches/900-sys_types__no__sys_sysmacros__include.patch"
    "${freetz}/make/squashfs4-be/patches/910-gcc10_fix_multiple_definitions_error.patch"
  ];

  buildInputs = [ xz ];

  NIX_LDFLAGS = "-lgcc_s";
  
  preBuild = ''
    makeFlagsArray+=(
      EXTRA_CFLAGS="-DTARGET_FORMAT=AVM_BE -ffunction-sections -fdata-sections"
      GZIP_SUPPORT="0"
      LZMA_XZ_SUPPORT="0"
      XZ_SUPPORT="1"
      COMP_DEFAULT="xz"
      XATTR_SUPPORT="0"
      XATTR_DEFAULT="0"
    )
  '';

  installFlags = "INSTALL_DIR=\${out}/bin";

  installPhase = ''
    runHook preInstall

    mkdir -p $out/bin
    cp mksquashfs $out/bin/mksquashfs-avm-be
    cp unsquashfs $out/bin/unsquashfs-avm-be

    runHook postInstall
  '';

  meta = {
    homepage = "http://squashfs.sourceforge.net/";
    description = "Tool for creating and unpacking squashfs filesystems";
    platforms = lib.platforms.unix;
    license = lib.licenses.gpl2Plus;
    maintainers = with lib.maintainers; [ royneary ];
  };
}