import os
import subprocess
import parser

if "VIRTUAL_ENV" not in os.environ:
    sys.stderr.write("$VIRTUAL_ENV not found.\n\n")
    parser.print_usage()
    sys.exit(-1)
virtualenv = os.environ["VIRTUAL_ENV"]
file_path = os.path.dirname(__file__)
subprocess.call(["pip", "install", "-E", virtualenv, "--requirement",
                 os.path.join(file_path, "requirements/apps.txt")])