dd-agent: override python packages inside expression

pkgs/tools/networking/dd-agent/5.nix

@@ -1,8 +1,9 @@
-{ stdenv, fetchFromGitHub, pythonPackages
+{ stdenv, fetchFromGitHub, python
 , unzip, makeWrapper }:
 let
-  inherit (pythonPackages) python;
-  docker_1_10 = pythonPackages.buildPythonPackage rec {
+  python' = python.override {
+    packageOverrides = self: super: {
+      docker = self.buildPythonPackage rec {
         name = "docker-${version}";
         version = "1.10.6";
 
@@ -13,7 +14,7 @@ let
           sha256 = "1awzpbrkh4fympqzddz5i3ml81b7f0i0nwkvbpmyxjjfqx6l0m4m";
         };
 
-    propagatedBuildInputs = with pythonPackages; [
+        propagatedBuildInputs = with self; [
           six
           requests
           websocket_client
@@ -27,6 +28,16 @@ let
         doCheck = false;
       };
 
+      pymongo = super.pymongo.overridePythonAttrs (oldAttrs: rec {
+        version = "2.9.5";
+        src = oldAttrs.src.override {
+          inherit version;
+          sha256 = "912516ac6a355d7624374a38337b8587afe3eb535c0a5456b3bd12df637a6e70";
+        };
+      });
+    };
+  };
+
 in stdenv.mkDerivation rec {
   version = "5.11.2";
   name = "dd-agent-${version}";
@@ -41,21 +52,21 @@ in stdenv.mkDerivation rec {
   patches = [ ./40103-iostat-fix.patch ];
 
   buildInputs = [
-    python
     unzip
     makeWrapper
-    pythonPackages.requests
-    pythonPackages.psycopg2
-    pythonPackages.psutil
-    pythonPackages.ntplib
-    pythonPackages.simplejson
-    pythonPackages.pyyaml
-    pythonPackages.pymongo_2_9_1
-    pythonPackages.python-etcd
-    pythonPackages.consul
-    docker_1_10
-  ];
-  propagatedBuildInputs = with pythonPackages; [ python tornado ];
+  ] ++ (with python'.pkgs; [
+    requests
+    psycopg2
+    psutil
+    ntplib
+    simplejson
+    pyyaml
+    pymongo
+    python-etcd
+    consul
+    docker
+  ]);
+  propagatedBuildInputs = with python'.pkgs; [ python tornado ];
 
   buildCommand = ''
     mkdir -p $out/bin