[git-remote-helper] doesn't follow http redirects

Grabbing the latest bzr using 'git clone bzr::lp:bzr' takes a long time. After that long time (it varies from one attempt to the next), the clone fails claiming an odd redirect. Reproducible.

Cloning with 'bzr branch lp:bzr bazaar' is much faster and works fine. I'm not sure yet if conversion to git with 'git clone bzr::$(pwd)/bazaar bzr' works after that, since the command is still running.

$ git clone bzr::lp:bzr
Cloning into 'bzr'...
You have not informed bzr of your Launchpad ID, and you must do this to
write to Launchpad or access private data. See "bzr help launchpad-login".
Traceback (most recent call last):t map 8378/24733
  File "/usr/lib/git-core/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 168, in process
    self.process_line(l, outf)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/git_remote_helper.py", line 184, 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 134, 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 560, in _lookup_revision_sha1
    self._update_sha_map(revid)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 368, in _update_sha_map
    self._update_sha_map_revision(revid)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 468, in _update_sha_map_revision
    for path, obj, ie in self._revision_to_objects(rev, tree, lossy=(not self.mapping.roundtripping)):
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 422, in _revision_to_objects
    self._cache.idmap, unusual_modes, self.mapping.BZR_DUMMY_FILE):
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 283, in _tree_to_objects
    dummy_file_name)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/mapping.py", line 566, in directory_to_tree
    hexsha = lookup_ie_sha1(ie)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 272, in ie_to_hexsha
    dummy_file_name)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/mapping.py", line 566, in directory_to_tree
    hexsha = lookup_ie_sha1(ie)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/git/object_store.py", line 266, in ie_to_hexsha
    blob.data = tree.get_file_text(ie.file_id)
  File "/usr/lib/python2.7/dist-packages/bzrlib/revisiontree.py", line 70, in get_file_text
    for (identifier, content) in self.iter_files_bytes([(file_id, None)]):
  File "/usr/lib/python2.7/dist-packages/bzrlib/revisiontree.py", line 225, in iter_files_bytes
    for result in self._repository.iter_files_bytes(repo_desired_files):
  File "/usr/lib/python2.7/dist-packages/bzrlib/vf_repository.py", line 1563, in iter_files_bytes
    for record in self.texts.get_record_stream(text_keys, 'unordered', True):
  File "/usr/lib/python2.7/dist-packages/bzrlib/groupcompress.py", line 1456, in get_record_stream
    orig_keys, ordering, include_delta_closure):
  File "/usr/lib/python2.7/dist-packages/bzrlib/groupcompress.py", line 1609, in _get_remaining_record_stream
    for factory in batcher.yield_factories():
  File "/usr/lib/python2.7/dist-packages/bzrlib/groupcompress.py", line 1170, in yield_factories
    block_read_memo, block = blocks.next()
  File "/usr/lib/python2.7/dist-packages/bzrlib/groupcompress.py", line 1412, in _get_blocks
    zdata = raw_records.next()
  File "/usr/lib/python2.7/dist-packages/bzrlib/repofmt/pack_repo.py", line 2043, in get_raw_records
    for names, read_func in reader.iter_records():
  File "/usr/lib/python2.7/dist-packages/bzrlib/pack.py", line 279, in iter_records
    self._read_format()
  File "/usr/lib/python2.7/dist-packages/bzrlib/pack.py", line 320, in _read_format
    format = self._read_line()

  File "/usr/lib/python2.7/dist-packages/bzrlib/pack.py", line 247, in _read_line
    line = self._source.readline()
  File "/usr/lib/python2.7/dist-packages/bzrlib/pack.py", line 210, in readline
    self._next()
  File "/usr/lib/python2.7/dist-packages/bzrlib/pack.py", line 195, in _next
    offset, data = self.readv_result.next()
  File "/usr/lib/python2.7/dist-packages/bzrlib/transport/http/__init__.py", line 241, in _readv
    for cur_coal, rfile in self._coalesce_readv(relpath, coalesced):
  File "/usr/lib/python2.7/dist-packages/bzrlib/transport/http/__init__.py", line 333, in _coalesce_readv
    for c, rfile in get_and_yield(relpath, ranges):
  File "/usr/lib/python2.7/dist-packages/bzrlib/transport/http/__init__.py", line 296, in get_and_yield
    code, rfile = self._get(relpath, coalesced)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transport/http/_urllib.py", line 120, in _get
    response = self._perform(request)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transport/http/_urllib.py", line 91, in _perform
    is_permanent=(code == 301))
bzrlib.errors.RedirectRequested: http://bazaar.launchpad.net/~bzr-pqm/bzr/bzr.dev/.bzr/repository/packs/a1bd96ce1421fe7d0b8d357b708a73c7.pack is redirected to https://launchpad.net

 $ dpkg-query -W bzr-git python-dulwich bzr python-bzrlib
 bzr 2.5.0~beta5-2
 bzr-git 0.6.6+bzr1561-1~jrn
 python-bzrlib 2.5.0~beta5-2
 python-dulwich 0.8.3-1~jrn