git-remote-bzr cannot clone the emacs repository

Package: bzr-git
Version: 0.6.8-1
Severity: normal

Dear Maintainer,

git-remote-bzr cannot be used to clone the Emacs bzr repository. Here's
a traceback, where ~/src/emacs/trunk is a branch of
<bzr://bzr.savannah.gnu.org/emacs/trunk>:

--8<---------------cut here---------------start------------->8---
olor:~/src/emacs% git clone bzr::$PWD/trunk git1
Cloning into 'git1'...
Traceback (most recent call last):
  File "/usr/bin/git-remote-bzr", line 49, in <module>
    helper.process(sys.stdin, sys.stdout)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/git_remote_helper.py", line 170, in process
    self.process_line(l, outf)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/git_remote_helper.py", line 186, in process_line
    self.commands[argv[0]](self, outf, argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/git_remote_helper.py", line 120, in cmd_list
    for ref, git_sha1 in refs.as_dict().iteritems():
  File "/usr/lib/python2.7/dist-packages/dulwich/repo.py", line 202, in as_dict
    ret[key] = self[("%s/%s" % (base, key)).strip("/")]
  File "/usr/lib/python2.7/dist-packages/dulwich/repo.py", line 273, in __getitem__
    _, sha = self._follow(name)
  File "/usr/lib/python2.7/dist-packages/dulwich/repo.py", line 255, in _follow
    contents = self.read_ref(refname)
  File "/usr/lib/python2.7/dist-packages/dulwich/repo.py", line 231, in read_ref
    contents = self.read_loose_ref(refname)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/refs.py", line 136, in read_loose_ref
    return self.object_store._lookup_revision_sha1(revid)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 580, in _lookup_revision_sha1
    self._update_sha_map(revid)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 384, in _update_sha_map
    self._update_sha_map_revision(revid)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 487, in _update_sha_map_revision
    ie = { "testament3-sha1": testament3.as_sha1() }
  File "/usr/lib/python2.7/dist-packages/bzrlib/testament.py", line 214, in as_sha1
    return sha_strings(self.as_text_lines())
  File "/usr/lib/python2.7/dist-packages/bzrlib/testament.py", line 154, in as_text_lines
    a(self._entry_to_line(path, ie))
  File "/usr/lib/python2.7/dist-packages/bzrlib/testament.py", line 224, in _entry_to_line
    l = Testament._entry_to_line(self, path, ie)[:-1]
  File "/usr/lib/python2.7/dist-packages/bzrlib/testament.py", line 185, in _entry_to_line
    l = u' %s %s %s%s%s\n' % (ie.kind, self._escape_path(path),
  File "/usr/lib/python2.7/dist-packages/bzrlib/testament.py", line 242, in _escape_path
    raise ValueError(path)
ValueError: admin/ab
zsh: exit 128 git clone bzr::$PWD/trunk git1
--8<---------------cut here---------------end--------------->8---

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages bzr-git depends on:
ii bzr 2.6.0~bzr6522-1
ii python 2.7.2-10
ii python-dulwich 0.8.5-2
ii python2.6 2.6.7-4
ii python2.7 2.7.3~rc2-2.1

Versions of packages bzr-git recommends:
ii python-tdb 1.2.10-1

Versions of packages bzr-git suggests:
ii bzr-fastimport 0.13.0-1

-- no debconf information