ugly exception on self-signed https certificate

[Martin Pool]

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 affects bzr

bzr: ERROR: pycurl.error: (60, 'server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt')

Traceback (most recent call last):
  File "/home/mbp/lib/python/bzrlib/commands.py", line 718, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/home/mbp/lib/python/bzrlib/commands.py", line 679, in run_bzr
    ret = run(*run_argv)
  File "/home/mbp/lib/python/bzrlib/commands.py", line 375, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/mbp/lib/python/bzrlib/commands.py", line 689, in ignore_pipe
    result = func(*args, **kwargs)
  File "/home/mbp/lib/python/bzrlib/builtins.py", line 1619, in run
    location)
  File "/home/mbp/lib/python/bzrlib/bzrdir.py", line 634, in open_containing_tree_or_branch
    bzrdir, relpath = klass.open_containing(location)
  File "/home/mbp/lib/python/bzrlib/bzrdir.py", line 589, in open_containing
    return BzrDir.open_containing_from_transport(get_transport(url))
  File "/home/mbp/lib/python/bzrlib/bzrdir.py", line 610, in open_containing_from_transport
    result = BzrDir.open_from_transport(a_transport)
  File "/home/mbp/lib/python/bzrlib/bzrdir.py", line 565, in open_from_transport
    redirected)
  File "/home/mbp/lib/python/bzrlib/lazy_import.py", line 116, in __call__
    return obj(*args, **kwargs)
  File "/home/mbp/lib/python/bzrlib/transport/__init__.py", line 1092, in do_catching_redirections
    return action(transport)
  File "/home/mbp/lib/python/bzrlib/bzrdir.py", line 542, in find_format
    transport, _server_formats=_server_formats)
  File "/home/mbp/lib/python/bzrlib/bzrdir.py", line 1242, in find_format
    return format.probe_transport(transport)
  File "/home/mbp/lib/python/bzrlib/bzrdir.py", line 1252, in probe_transport
    format_string = transport.get(".bzr/branch-format").read()
  File "/home/mbp/lib/python/bzrlib/transport/http/__init__.py", line 227, in get
    code, response_file = self._get(relpath, None)
  File "/home/mbp/lib/python/bzrlib/transport/http/_pycurl.py", line 144, in _get
    return self._get_full(relpath)
  File "/home/mbp/lib/python/bzrlib/transport/http/_pycurl.py", line 179, in _get_full
    self._curl_perform(curl, header)
  File "/home/mbp/lib/python/bzrlib/transport/http/_pycurl.py", line 267, in _curl_perform
    curl.perform()
error: (60, 'server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt')

bzr 0.16.0 on python 2.5.1.final.0 (linux2)
arguments: ['/home/mbp/bin/bzr', 'log', 'https://REMOVED']

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