realms-wiki/realms/modules/wiki/__init__.py

import os
import sys
from realms import app
from realms.modules.wiki.models import Wiki

# Init Wiki
Wiki(app.config['WIKI_PATH'])

# Check paths
for mode in [os.W_OK, os.R_OK]:
    for dir_ in [app.config['WIKI_PATH'], os.path.join(app.config['WIKI_PATH'], '.git')]:
        if not os.access(dir_, mode):
            sys.exit('Read and write access to WIKI_PATH is required (%s)' % dir_)