gistfile1.txt

    // Access callback is being called as part of og_context_determine_context()
    // calling menu_get_item(). However at this point there is no determined
    // context, since it's the first time it is being called.
    // In fact. this access callback is being called twice: First time from within
    // og context attempts to get the current group ID. In that case, we return
    // early, and let OG context finish its job.
    // The second time this function will be called, the og_context_is_init()
    // will return TRUE, thus we will perform the real access check.