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diff --git a/bzrlib/transport/fakevfat.py b/bzrlib/transport/fakevfat.py
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+# Copyright (C) 2006 Canonical Ltd
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+"""Fake transport with some restrictions of Windows VFAT filesystems.
+
+VFAT on Windows has several restrictions that are not present on unix
+filesystems, which are imposed by this transport.
+
+VFAT is strictly 8-bit using codepages to represent non-ascii characters.
+This implementation currently doesn't model the codepage but just insists
+on only ascii characters being written.
+
+Restrictions imposed by this transport:
+
+ * filenames are squashed to lowercase
+ * filenames containing non-ascii characters are not allowed
+ * filenames containing the characters "@<>" are not allowed
+   (there should be more?)
+
+Some other restrictions are not implemented yet, but possibly could be:
+
+ * open files can't be deleted or renamed
+ * directories containing open files can't be renamed
+ * special device names (NUL, LPT, ...) are not allowed
+
+"""
+
+from __future__ import absolute_import
+
+import re
+
+from bzrlib.transport import decorator
+
+
+# TODO: It might be nice if these hooks were available in a more general way
+# on all paths passed in to the Transport, so that we didn't have to hook
+# every single method.
+
+# TODO: Perhaps don't inherit from TransportDecorator so that methods
+# which are not implemented here fail by default?
+
+
+class FakeVFATTransportDecorator(decorator.TransportDecorator):
+    """A decorator that can convert any transport to be readonly.
+
+    This is requested via the 'vfat+' prefix to get_transport().
+
+    This is intended only for use in testing and doesn't implement every
+    method very well yet.
+
+    This transport is typically layered on a local or memory transport
+    which actually stored the files.
+    """
+
+    def _can_roundtrip_unix_modebits(self):
+        """See Transport._can_roundtrip_unix_modebits()."""
+        return False
+
+    @classmethod
+    def _get_url_prefix(self):
+        """Readonly transport decorators are invoked via 'vfat+'"""
+        return 'vfat+'
+
+    def _squash_name(self, name):
+        """Return vfat-squashed filename.
+
+        The name is returned as it will be stored on disk.  This raises an
+        error if there are invalid characters in the name.
+        """
+        if re.search(r'[?*:;<>]', name):
+            raise ValueError("illegal characters for VFAT filename: %r" % name)
+        return name.lower()
+
+    def get(self, relpath):
+        return self._decorated.get(self._squash_name(relpath))
+
+    def mkdir(self, relpath, mode=None):
+        return self._decorated.mkdir(self._squash_name(relpath), 0755)
+
+    def has(self, relpath):
+        return self._decorated.has(self._squash_name(relpath))
+
+    def _readv(self, relpath, offsets):
+        return self._decorated.readv(self._squash_name(relpath), offsets)
+
+    def put_file(self, relpath, f, mode=None):
+        return self._decorated.put_file(self._squash_name(relpath), f, mode)
+
+
+def get_test_permutations():
+    """Return the permutations to be used in testing."""
+    from bzrlib.tests import test_server
+    return [(FakeVFATTransportDecorator, test_server.FakeVFATServer),]