# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Date 1325831879 -3600
# Node ID e43c140eb08fed717ff26cd45c2dc92db7778e39
# Parent  e6c44dbe902ff17b8e966b1a2e668b91c914337b
dirstate: propagate IOError other than ENOENT when reading branch

diff -r e6c44dbe902f -r e43c140eb08f mercurial/dirstate.py
--- a/mercurial/dirstate.py	Fri Jan 06 15:05:51 2012 +0100
+++ b/mercurial/dirstate.py	Fri Jan 06 07:37:59 2012 +0100
@@ -4,6 +4,7 @@
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
+import errno
 
 from node import nullid
 from i18n import _
@@ -80,7 +81,9 @@
     def _branch(self):
         try:
             return self._opener.read("branch").strip() or "default"
-        except IOError:
+        except IOError, inst:
+            if inst.errno != errno.ENOENT:
+                raise
             return "default"
 
     @propertycache