openvpn: add openvpn_learnaddress script

pkgs/tools/networking/openvpn/openvpn_learnaddress.nix

@@ -0,0 +1,27 @@
+{ stdenv, fetchgit, makeWrapper,  coreutils, gawk, utillinux }:
+
+stdenv.mkDerivation rec {
+  name = "openvpn-learnaddress-19b03c3";
+
+  src = fetchgit {
+    url = https://gist.github.com/4058733.git;
+    rev = "19b03c3beb0190df46ea07bf4b68244acb8eae80";
+    sha256 = "16pcyvyhwsx34i0cjkkx906lmrwdd9gvznvqdwlad4ha8l8f8z42";
+  };
+
+  buildInputs = [ makeWrapper coreutils gawk utillinux ];
+
+  installPhase = ''
+    install -Dm555 ovpn-learnaddress $out/libexec/openvpn/openvpn-learnaddress
+
+    wrapProgram $out/libexec/openvpn/openvpn-learnaddress \
+        --prefix PATH : ${coreutils}/bin:${gawk}/bin:${utillinux}/bin
+  '';
+
+  meta = {
+    description = "Openvpn learn-address script to manage a hosts-like file";
+    homepage = https://gist.github.com/offlinehacker/4058733/;
+    maintainers = [ stdenv.lib.maintainers.offline ];
+    platforms = stdenv.lib.platforms.unix;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -1491,6 +1491,8 @@ let
 
   openvpn = callPackage ../tools/networking/openvpn { };
 
+  openvpn_learnaddress = callPackage ../tools/networking/openvpn/openvpn_learnaddress.nix { };
+
   optipng = callPackage ../tools/graphics/optipng { };
 
   oslrd = callPackage ../tools/networking/oslrd { };