Merged revisions 76034,76054 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r76034 | antoine.pitrou | 2009-11-01 22:29:33 +0100 (dim., 01 nov. 2009) | 3 lines

  This should finally fix #6896. Let's watch the buildbots.
........
  r76054 | antoine.pitrou | 2009-11-02 12:34:27 +0100 (lun., 02 nov. 2009) | 3 lines

  Since r76034 was successful, add a NEWS entry for it.
........

Lib/mailbox.py

@@ -234,6 +234,9 @@ class Maildir(Mailbox):
                 raise NoSuchMailboxError(self._path)
         self._toc = {}
         self._last_read = None          # Records last time we read cur/new
+        # NOTE: we manually invalidate _last_read each time we do any
+        # modifications ourselves, otherwise we might get tripped up by
+        # bogus mtime behaviour on some systems (see issue #6896).
 
     def add(self, message):
         """Add message and return assigned key."""
@@ -267,11 +270,15 @@ class Maildir(Mailbox):
                 raise
         if isinstance(message, MaildirMessage):
             os.utime(dest, (os.path.getatime(dest), message.get_date()))
+        # Invalidate cached toc
+        self._last_read = None
         return uniq
 
     def remove(self, key):
         """Remove the keyed message; raise KeyError if it doesn't exist."""
         os.remove(os.path.join(self._path, self._lookup(key)))
+        # Invalidate cached toc (only on success)
+        self._last_read = None
 
     def discard(self, key):
         """If the keyed message exists, remove it."""
@@ -306,6 +313,8 @@ class Maildir(Mailbox):
         if isinstance(message, MaildirMessage):
             os.utime(new_path, (os.path.getatime(new_path),
                                 message.get_date()))
+        # Invalidate cached toc
+        self._last_read = None
 
     def get_message(self, key):
         """Return a Message representation or raise a KeyError."""
@@ -360,7 +369,9 @@ class Maildir(Mailbox):
 
     def flush(self):
         """Write any pending changes to disk."""
-        return  # Maildir changes are always written immediately.
+        # Maildir changes are always written immediately, so there's nothing
+        # to do except invalidate our cached toc.
+        self._last_read = None
 
     def lock(self):
         """Lock the mailbox."""

Lib/test/test_mailbox.py

@@ -673,6 +673,9 @@ class TestMaildir(TestMailbox):
         self.assertEqual(self._box._lookup(key0), os.path.join('new', key0))
         os.remove(os.path.join(self._path, 'new', key0))
         self.assertEqual(self._box._toc, {key0: os.path.join('new', key0)})
+        # Be sure that the TOC is read back from disk (see issue #6896
+        # about bad mtime behaviour on some systems).
+        self._box.flush()
         self.assertRaises(KeyError, lambda: self._box._lookup(key0))
         self.assertEqual(self._box._toc, {})
 

Misc/NEWS

@@ -123,6 +123,10 @@ C-API
 Library
 -------
 
+- Issue #6896: mailbox.Maildir now invalidates its internal cache each time
+  a modification is done through it.  This fixes inconsistencies and test
+  failures on systems with slightly bogus mtime behaviour.
+
 - Issue #7246 & Issue #7208: getpass now properly flushes input before
   reading from stdin so that existing input does not confuse it and
   lead to incorrect entry or an IOError.  It also properly flushes it