prevent distutils during module install from downloading and load pth files

based on a patch by Cillian de Róiste

svn path=/nixpkgs/branches/stdenv-updates/; revision=32583

pkgs/development/python-modules/offline-distutils/default.nix

@@ -0,0 +1,21 @@
+# Used during module installation to prevent easy_install and python
+# setup.py install/test from downloading
+
+{ stdenv, python }:
+
+stdenv.mkDerivation {
+  name = "python-offline-distutils-${python.version}";
+
+  buildInputs = [ python ];
+
+  unpackPhase = "true";
+  installPhase = ''
+    dst="$out/lib/${python.libPrefix}"
+    ensureDir $dst/distutils
+    ln -s ${python}/lib/${python.libPrefix}/distutils/* $dst/distutils/
+    cat <<EOF > $dst/distutils/distutils.cfg
+[easy_install]
+allow-hosts = None
+EOF
+  '';
+}