bettercap: 1.6.2 -> 2.4.0

bettercap 2 is a complete reimplementation using go instead of ruby
See: https://www.evilsocket.net/2018/02/27/All-hail-bettercap-2-0-one-tool-to-rule-them-all/

pkgs/tools/security/bettercap/default.nix

@@ -1,16 +1,23 @@
-{ lib, bundlerEnv, ruby, libpcap}:
+{ stdenv, buildGoPackage, fetchFromGitHub, pkgconfig, libpcap, libnfnetlink, libnetfilter_queue }:
 
-bundlerEnv rec {
+buildGoPackage rec {
   name = "bettercap-${version}";
+  version = "2.4";
 
-  version = (import gemset).bettercap.version;
-  inherit ruby;
-  gemdir = ./.;
-  gemset = ./gemset.nix;
+  goPackagePath = "github.com/bettercap/bettercap";
 
-  buildInputs = [ libpcap ruby ];
+  src = fetchFromGitHub {
+    owner = "bettercap";
+    repo = "bettercap";
+    rev = "v${version}";
+    sha256 = "1k1ank8z9sr3vxm86dfcrn1y3qa3gfwyb2z0fvkvi38gc88pfljb";
+  };
 
-  meta = with lib; {
+  buildInputs = [libpcap libnfnetlink libnetfilter_queue pkgconfig];
+
+  goDeps = ./deps.nix;
+
+  meta = with stdenv.lib; {
     description = "A man in the middle tool";
     longDescription = ''
       BetterCAP is a powerful, flexible and portable tool created to perform various types of MITM attacks against a network, manipulate HTTP, HTTPS and TCP traffic in realtime, sniff for credentials and much more.