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path: root/pkgs/os-specific/linux/wireguard/default.nix
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{ stdenv, fetchurl, libmnl, kernel ? null }:

# module requires Linux >= 3.10 https://www.wireguard.io/install/#kernel-requirements
assert kernel != null -> stdenv.lib.versionAtLeast kernel.version "3.10";

let
  name = "wireguard-${version}";

  version = "0.0.20180218";

  src = fetchurl {
    url    = "https://git.zx2c4.com/WireGuard/snapshot/WireGuard-${version}.tar.xz";
    sha256 = "4ac4c4e4ad4dc2cf9dcb831b0cf347567ccea675ca524528cf5a4d9dccb2fe52";
  };

  meta = with stdenv.lib; {
    homepage     = https://www.wireguard.com/;
    downloadPage = https://git.zx2c4.com/WireGuard/refs/;
    description  = "A prerelease of an experimental VPN tunnel which is not to be depended upon for security";
    maintainers  = with maintainers; [ ericsagnes mic92 zx2c4 ];
    license      = licenses.gpl2;
    platforms    = platforms.linux;
  };

  module = stdenv.mkDerivation {
    inherit src meta name;

    preConfigure = ''
      cd src
      sed -i '/depmod/,+1d' Makefile
    '';

    hardeningDisable = [ "pic" ];

    KERNELDIR = "${kernel.dev}/lib/modules/${kernel.modDirVersion}/build";
    INSTALL_MOD_PATH = "\${out}";

    NIX_CFLAGS = ["-Wno-error=cpp"];

    nativeBuildInputs = kernel.moduleBuildDependencies;

    buildPhase = "make module";
  };

  tools = stdenv.mkDerivation {
    inherit src meta name;

    preConfigure = "cd src";

    buildInputs = [ libmnl ];

    enableParallelBuilding = true;

    makeFlags = [
      "WITH_BASHCOMPLETION=yes"
      "WITH_WGQUICK=yes"
      "WITH_SYSTEMDUNITS=yes"
      "DESTDIR=$(out)"
      "PREFIX=/"
      "-C" "tools"
    ];

    buildPhase = "make tools";

    postInstall = ''
      substituteInPlace $out/lib/systemd/system/wg-quick@.service \
        --replace /usr/bin $out/bin
    '';
  };

in if kernel == null
   then tools
   else module