look for files locally that do not have READ permission.

gistfile1.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
    recursively crawls directory
    if any file does not have READ permission
    squawks to stdout
"""
import os

directory = '/path/to/directory/'

found = False
for (path, dirs, files) in os.walk(directory, followlinks=False):  
    for f in files:
        if not os.access(f, os.R_OK):
            print('Please report to Sick Bay: ' + path + '/' + f)
            found = True

if not found:
    print("All files are READ ok")
    print("You are in command of the Bridge.")