from os import path as osp

import sys

import os

def in_egg(path):

    head, tail = osp.split(path)

    while tail:

        if tail.endswith('.egg'):

            return True

        head, tail = osp.split(head)

    return False

if in_egg(__file__):

    from cubicweb.cwconfig import _find_prefix

    INSTALL_PREFIX = _find_prefix()

    if not osp.exists(osp.join(INSTALL_PREFIX, 'share', 'cubicweb', 'migration')):

        print >> sys.stderr, 'copying cubicweb content to the expected location'

        from shutil import copytree

        import tarfile

        import tempfile

        from pkg_resources import Requirement, resource_filename

        from functools import partial

        file_path = partial(resource_filename, Requirement.parse("cubicweb"))

        for df in ('share', 'lib'):

            # Tar are used to merge with destination directory

            tmp_file = tempfile.NamedTemporaryFile(suffix='.tar')

            tmp_tar  = tarfile.TarFile(tmp_file.name, mode='w')

            tmp_tar.add(file_path(df), arcname=df)

            tmp_tar  = tarfile.TarFile(tmp_file.name, mode='r')

            tmp_tar.extractall(path=INSTALL_PREFIX)