From f49158b93aef7eb312de7da5f45a7606384e1fbe Mon Sep 17 00:00:00 2001
From: Denis Demidov <dennis.demidov@gmail.com>
Date: Sun, 8 Nov 2015 10:46:28 +0300
Subject: [PATCH] Use os.stat instead of os.access

This gives true file permissions irregardless of the current user.
Fixes #84
---
 ev3dev/core.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/ev3dev/core.py b/ev3dev/core.py
index 6092fe9..247f770 100644
--- a/ev3dev/core.py
+++ b/ev3dev/core.py
@@ -36,6 +36,7 @@
 import mmap
 import ctypes
 import re
+import stat
 from os.path import abspath
 from PIL import Image, ImageDraw
 from struct import pack, unpack
@@ -58,8 +59,10 @@ def file_handle(self, path, binary=False):
         """Manages the file handle cache and opening the files in the correct mode"""
 
         if path not in self._cache:
-            r_ok = os.access(path, os.R_OK)
-            w_ok = os.access(path, os.W_OK)
+            mode = stat.S_IMODE(os.stat(path)[stat.ST_MODE])
+
+            r_ok = mode & stat.S_IRGRP
+            w_ok = mode & stat.S_IWGRP
 
             if r_ok and w_ok:
                 mode = 'a+'