diff --git a/hgext/convert/transport.py b/hgext/convert/transport.py
new file mode 100644
--- /dev/null
+++ b/hgext/convert/transport.py
@@ -0,0 +1,134 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (C) 2007 Daniel Holth <dholth@fastmail.fm>
+# This is a stripped-down version of the original bzr-svn transport.py,
+# Copyright (C) 2006 Jelmer Vernooij <jelmer@samba.org>
+
+# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+from cStringIO import StringIO
+import os
+from tempfile import mktemp
+
+from svn.core import SubversionException, Pool
+import svn.ra
+import svn.core
+
+# Some older versions of the Python bindings need to be 
+# explicitly initialized. But what we want to do probably
+# won't work worth a darn against those libraries anyway!
+svn.ra.initialize()
+
+svn_config = svn.core.svn_config_get_config(None)
+
+
+def _create_auth_baton(pool):
+    """Create a Subversion authentication baton. """
+    import svn.client
+    # Give the client context baton a suite of authentication
+    # providers.h
+    providers = [
+        svn.client.get_simple_provider(pool),
+        svn.client.get_username_provider(pool),
+        svn.client.get_ssl_client_cert_file_provider(pool),
+        svn.client.get_ssl_client_cert_pw_file_provider(pool),
+        svn.client.get_ssl_server_trust_file_provider(pool),
+        ]
+    return svn.core.svn_auth_open(providers, pool)
+
+
+#    # The SVN libraries don't like trailing slashes...
+#    return url.rstrip('/')
+
+
+class SvnRaCallbacks(svn.ra.callbacks2_t):
+    """Remote access callbacks implementation for bzr-svn."""
+    def __init__(self, pool):
+        svn.ra.callbacks2_t.__init__(self)
+        self.auth_baton = _create_auth_baton(pool)
+        self.pool = pool
+    
+    def open_tmp_file(self, pool):
+        return mktemp(prefix='tailor-svn')
+
+class NotBranchError(SubversionException):
+    pass
+
+class SvnRaTransport(object):
+    """
+    Open an ra connection to a Subversion repository.
+    """
+    def __init__(self, url="", ra=None):
+        self.pool = Pool()
+        self.svn_url = url
+
+        # Only Subversion 1.4 has reparent()
+        if ra is None or not hasattr(svn.ra, 'reparent'):
+            self.callbacks = SvnRaCallbacks(self.pool)
+            try:
+                ver = svn.ra.version()
+                try: # Older SVN bindings
+                    self.ra = svn.ra.open2(self.svn_url.encode('utf8'), self.callbacks, None, svn_config, None)
+                except TypeError, e:
+                    self.ra = svn.ra.open2(self.svn_url.encode('utf8'), self.callbacks, svn_config, None)
+            except SubversionException, (_, num):
+                if num == svn.core.SVN_ERR_RA_ILLEGAL_URL:
+                    raise NotBranchError(url)
+                if num == svn.core.SVN_ERR_RA_LOCAL_REPOS_OPEN_FAILED:
+                    raise NotBranchError(url)
+                if num == svn.core.SVN_ERR_BAD_URL:
+                    raise NotBranchError(url)
+                raise
+
+        else:
+            self.ra = ra
+            svn.ra.reparent(self.ra, self.svn_url.encode('utf8'))
+
+    class Reporter:
+        def __init__(self, (reporter, report_baton)):
+            self._reporter = reporter
+            self._baton = report_baton
+
+        def set_path(self, path, revnum, start_empty, lock_token, pool=None):
+            svn.ra.reporter2_invoke_set_path(self._reporter, self._baton,
+                        path, revnum, start_empty, lock_token, pool)
+
+        def delete_path(self, path, pool=None):
+            svn.ra.reporter2_invoke_delete_path(self._reporter, self._baton,
+                    path, pool)
+
+        def link_path(self, path, url, revision, start_empty, lock_token,
+                      pool=None):
+            svn.ra.reporter2_invoke_link_path(self._reporter, self._baton,
+                    path, url, revision, start_empty, lock_token,
+                    pool)
+
+        def finish_report(self, pool=None):
+            svn.ra.reporter2_invoke_finish_report(self._reporter,
+                    self._baton, pool)
+
+        def abort_report(self, pool=None):
+            svn.ra.reporter2_invoke_abort_report(self._reporter,
+                    self._baton, pool)
+
+    def do_update(self, revnum, path, *args, **kwargs):
+        return self.Reporter(svn.ra.do_update(self.ra, revnum, path, *args, **kwargs))
+
+    def clone(self, offset=None):
+        """See Transport.clone()."""
+        if offset is None:
+            return self.__class__(self.base)
+
+        return SvnRaTransport(urlutils.join(self.base, offset), ra=self.ra)