From: Daira Hopwood <daira@jacaranda.org>
Date: Thu, 22 Oct 2015 13:28:26 +0000 (+0100)
Subject: Fix infinite loop in should_ignore_path for absolute paths.
X-Git-Url: https://git.rkrishnan.org/%5B/%5D%20/uri/using.html?a=commitdiff_plain;h=e43bfafdd832a0b700eda0abe0713a4f8b21c714;p=tahoe-lafs%2Ftahoe-lafs.git

Fix infinite loop in should_ignore_path for absolute paths.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
---

diff --git a/src/allmydata/magicpath.py b/src/allmydata/magicpath.py
index ba15ed58..53e669b6 100644
--- a/src/allmydata/magicpath.py
+++ b/src/allmydata/magicpath.py
@@ -2,7 +2,7 @@
 import re
 import os.path
 
-from allmydata.util.assertutil import precondition
+from allmydata.util.assertutil import precondition, _assert
 
 def path2magic(path):
     return re.sub(ur'[/@]',  lambda m: {u'/': u'@_', u'@': u'@@'}[m.group(0)], path)
@@ -20,8 +20,14 @@ def should_ignore_file(path_u):
     for suffix in IGNORE_SUFFIXES:
         if path_u.endswith(suffix):
             return True
+
     while path_u != u"":
+        oldpath_u = path_u
         path_u, tail_u = os.path.split(path_u)
         if tail_u.startswith(u"."):
             return True
+        if path_u == oldpath_u:
+            return True  # the path was absolute
+        _assert(len(path_u) < len(oldpath_u), path_u=path_u, oldpath_u=oldpath_u)
+
     return False