nixpkgs/pkgs/development/python-modules/distutils-cfg/default.nix

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# global distutils configuration, see http://docs.python.org/2/install/index.html#distutils-configuration-files
{ stdenv, python, writeText, extraCfg ? "" }:
let
distutilsCfg = writeText "distutils.cfg" ''
[easy_install]
# don't allow network connections during build to ensure purity
allow-hosts = None
# make sure we always unzip installed packages otherwise setup hooks won't work
zip_ok = 0
${extraCfg}
'';
in stdenv.mkDerivation {
name = "${python.libPrefix}-distutils.cfg";
buildInputs = [ python ];
unpackPhase = "true";
installPhase = ''
dest="$out/lib/${python.libPrefix}/site-packages/distutils"
mkdir -p $dest
ln -s ${python}/lib/${python.libPrefix}/distutils/* $dest
ln -s ${distutilsCfg} $dest/distutils.cfg
'';
}