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diff --git a/bzrlib/transport/readonly.py b/bzrlib/transport/readonly.py
new file mode 100644
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+++ b/bzrlib/transport/readonly.py
@@ -0,0 +1,86 @@
+# Copyright (C) 2006, 2009 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
+
+"""Implementation of Transport that adapts another transport to be readonly."""
+
+from __future__ import absolute_import
+
+from bzrlib.errors import TransportNotPossible, NoSmartMedium
+from bzrlib.transport import decorator
+
+
+class ReadonlyTransportDecorator(decorator.TransportDecorator):
+    """A decorator that can convert any transport to be readonly.
+
+    This is requested via the 'readonly+' prefix to get_transport().
+    """
+
+    def append_file(self, relpath, f, mode=None):
+        """See Transport.append_file()."""
+        raise TransportNotPossible('readonly transport')
+
+    def append_bytes(self, relpath, bytes, mode=None):
+        """See Transport.append_bytes()."""
+        raise TransportNotPossible('readonly transport')
+
+    @classmethod
+    def _get_url_prefix(self):
+        """Readonly transport decorators are invoked via 'readonly+'"""
+        return 'readonly+'
+
+    def delete(self, relpath):
+        """See Transport.delete()."""
+        raise TransportNotPossible('readonly transport')
+
+    def delete_tree(self, relpath):
+        """See Transport.delete_tree()."""
+        raise TransportNotPossible('readonly transport')
+
+    def put_file(self, relpath, f, mode=None):
+        """See Transport.put_file()."""
+        raise TransportNotPossible('readonly transport')
+
+    def put_bytes(self, relpath, bytes, mode=None):
+        """See Transport.put_bytes()."""
+        raise TransportNotPossible('readonly transport')
+
+    def mkdir(self, relpath, mode=None):
+        """See Transport.mkdir()."""
+        raise TransportNotPossible('readonly transport')
+
+    def is_readonly(self):
+        """See Transport.is_readonly."""
+        return True
+
+    def rmdir(self, relpath):
+        """See Transport.rmdir."""
+        raise TransportNotPossible('readonly transport')
+
+    def lock_write(self, relpath):
+        """See Transport.lock_write."""
+        raise TransportNotPossible('readonly transport')
+
+    def get_smart_client(self):
+        raise NoSmartServer(self.base)
+
+    def get_smart_medium(self):
+        raise NoSmartMedium(self)
+
+
+def get_test_permutations():
+    """Return the permutations to be used in testing."""
+    from bzrlib.tests import test_server
+    return [(ReadonlyTransportDecorator, test_server.ReadonlyServer),]