"""
Use libraries from a virtualenv (by modifying sys.path) in production.
"""

import os
import sys

if os.path.basename(sys.prefix) != "zulip-py3-venv":
    BASE_DIR = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
    venv = os.path.join(BASE_DIR, "zulip-py3-venv")
    activate_this = os.path.join(venv, "bin", "activate_this.py")
    activate_locals = dict(__file__=activate_this)
    exec(open(activate_this).read(), activate_locals)
    if not os.path.exists(activate_locals["site_packages"]):
        raise RuntimeError(venv + " was not set up for this Python version")