cjdns: installing contrib scripts

I made the nodejs and python scripts have the proper shebang. A lot more
of them could be updated to reference store paths (calls to "python",
etc.)

(cherry picked from commit 2fb382afb6319065f20af22d86774df190beb0d5)

pkgs/tools/networking/cjdns/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, nodejs, which, python27 }:
+{ stdenv, fetchFromGitHub, nodejs, which, python27, utillinux }:
 
 let
   date = "20141023";
@@ -14,10 +14,20 @@ stdenv.mkDerivation {
     sha256 = "11z8dk7byxh9pfv7mhfvnk465qln1g7z8c8f822623d59lwjpbs1";
   };
 
-  buildInputs = [ which python27 nodejs];
+  buildInputs = [ which python27 nodejs ] ++
+    # for flock
+    stdenv.lib.optional stdenv.isLinux [ utillinux ];
 
   buildPhase = "bash do";
-  installPhase = "installBin cjdroute makekeys privatetopublic publictoip6";
+  installPhase = ''
+    installBin cjdroute makekeys privatetopublic publictoip6
+    sed -i 's,/usr/bin/env node,'$(type -P node), \
+      $(find contrib -name "*.js")
+    sed -i 's,/usr/bin/env python,'$(type -P python), \
+      $(find contrib -type f)
+    mkdir -p $out/share/cjdns
+    cp -R contrib node_build node_modules $out/share/cjdns/
+  '';
 
   meta = with stdenv.lib; {
     homepage = https://github.com/cjdelisle/cjdns;