bzr cannot work with Subversion on Debian Unstable

[Russel Winder]

A recent upgrade of Debian Unstable has led to a failure of subvertpy which means Bazaar doesn't work with Subversion repositories:

bzr: ERROR: exceptions.ImportError: Unable to load subvertpy extensions: /usr/lib/libneon-gnutls.so.27: undefined symbol: ne_ssl_context_get_flag

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1141, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 1216, in run
    possible_transports=possible_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 185, in open
    possible_transports=possible_transports, _unsupported=_unsupported)
  File "/usr/lib/python2.7/dist-packages/bzrlib/controldir.py", line 687, in open
    t = _mod_transport.get_transport(base, possible_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transport/__init__.py", line 1680, in get_transport
    return get_transport_from_url(location_to_url(base), possible_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transport/__init__.py", line 1655, in get_transport_from_url
    transport, last_err = _try_transport_factories(url, factory_list)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transport/__init__.py", line 1687, in _try_transport_factories
    return factory.get_obj()(base), None
  File "/usr/lib/python2.7/dist-packages/bzrlib/registry.py", line 74, in get_obj
    self._obj = get_named_object(self._module_name, self._member_name)
  File "/usr/lib/python2.7/dist-packages/bzrlib/pyutils.py", line 51, in get_named_object
    obj = __import__(module_name, {}, {}, from_list)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/transport.py", line 20, in <module>
    import subvertpy
  File "/usr/lib/python2.7/dist-packages/subvertpy/__init__.py", line 130, in <module>
    raise ImportError("Unable to load subvertpy extensions: %s" % e)
ImportError: Unable to load subvertpy extensions: /usr/lib/libneon-gnutls.so.27: undefined symbol: ne_ssl_context_get_flag

bzr 2.6.0dev2 on python 2.7.3rc2 (Linux-3.2.0-2-amd64-x86_64-with-debian-
    wheezy-sid)
arguments: ['/usr/bin/bzr', 'pull']
plugins: bash_completion[2.6.0dev2], bookmarks[2.3.0dev], builddeb[2.7.0dev],
    bzrtools[2.5.0], changelog_merge[2.6.0dev2], cvsps_import[unknown],
    dbus[0.1.0dev], email[unknown], explorer[1.2.2], fastimport[0.13.0],
    git[0.6.8], grep[0.5.0dev], gtk[0.104.0dev], launchpad[2.6.0dev2],
    loom[2.2.0], netrc_credential_store[2.6.0dev2], news_merge[2.6.0dev2],
    pipeline[1.4.0], po_merge[2.6.0dev2], pqm[1.4.0dev], qbzr[0.22.1],
    search[1.7.0dev], stats[0.2.0dev], svn[1.2.1], upload[1.1.0],
    weave_fmt[2.6.0dev2], xmloutput[0.8.8]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'en_GB.UTF-8'

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.

[Russel Winder (russel)]

I can confirm that the fix appears to have been released to Debian Unstable a number of days ago -- I can't remember exactly when but now bzr is working fine. As is Mercurial+hgsubversion which was hit by the same problem that underlay this one.