default.nix

with import <nixpkgs> {};
with pkgs.python27Packages;

stdenv.mkDerivation  {
  name = "impurePythonEnv";
  buildInputs = [
    taglib
    openssl
    git
    libxml2
    libxslt
    libzip
    python27Full
    python27Packages.virtualenv
    stdenv
    unzip
    zlib ];
  src = null;
  # When used as `nix-shell --pure`
  shellHook = ''
  PID=$$
  unset http_proxy
  export GIT_SSL_CAINFO=/etc/ssl/certs/ca-bundle.crt
  # set SOURCE_DATE_EPOCH so that we can use python wheels
  SOURCE_DATE_EPOCH=$(date +%s)
  virtualenv --no-setuptools --clear --quiet /tmp/$PID/venv
  rm -f get-pip.py
  wget -q -c https://bootstrap.pypa.io/get-pip.py
  /tmp/$PID/venv/bin/python get-pip.py
  /tmp/$PID/venv/bin/pip install --quiet --upgrade -r requirements.txt
  /tmp/$PID/venv/bin/pip install --quiet --upgrade -r dev-requirements.txt
  export PATH=/tmp/$PID/venv/bin:$PATH
  ln -s /tmp/$PID/venv venv
  '';
}