[PATCH] tags: don't allow environment errors to be raised from _writetagscache

[Steve Borho]

# HG changeset patch
# User Steve Borho <steve at borho.org>
# Date 1308255977 18000
# Node ID 4196f029b6b4a1f05dd0eac9a9df9d19424af4cc
# Parent  ba3c36cea66e7a9cc0bb274b7f7b73ad65212df7
tags: don't allow environment errors to be raised from _writetagscache

See https://bitbucket.org/tortoisehg/thg/issue/719

diff -r ba3c36cea66e -r 4196f029b6b4 mercurial/tags.py
--- a/mercurial/tags.py	Thu Jun 16 14:33:06 2011 -0500
+++ b/mercurial/tags.py	Thu Jun 16 15:26:17 2011 -0500
@@ -286,4 +286,7 @@
     for (name, (node, hist)) in cachetags.iteritems():
         cachefile.write("%s %s\n" % (hex(node), name))
 
-    cachefile.rename()
+    try:
+        cachefile.rename()
+    except (OSError, IOError):
+        pass