InvalidURL "no supported schemes" resolving missing branch without launchpad login

[John A Meinel]

I'm trying to build the bzr-2.5 installers. One piece of that is the bzr-rewrite plugin. However, the build machine does not have a 'launchpad_username" because I didn't want to add ssh keys to that machine. As such, it normally resolves the "lp:*" URLs to HTTP URLs, which it can download just fine.

$ bzr info lp:bzr-rewrite -Derror
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".
bzr: ERROR: bzrlib.errors.InvalidURL: Invalid url supplied to transport: "bzr+ssh://bazaar.launchpad.net/+branch/bzr-rew
rite": no supported schemes

Traceback (most recent call last):
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 918, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 1118, in run_bzr
    ret = run(*run_argv)
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 676, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 698, in run
    return self._operation.run_simple(*args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 1133, in ignore_pipe
    result = func(*args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\builtins.py", line 1595, in run
    show_bzrdir_info(bzrdir.BzrDir.open_containing(location)[0],
  File "C:\dev\bzr\bzr.dev\bzrlib\bzrdir.py", line 873, in open_containing
    transport = _mod_transport.get_transport(url, possible_transports)
  File "C:\dev\bzr\bzr.dev\bzrlib\transport\__init__.py", line 1644, in get_transport
    return get_transport_from_url(location_to_url(base), possible_transports)
  File "C:\dev\bzr\bzr.dev\bzrlib\transport\__init__.py", line 1566, in location_to_url
    location = directories.dereference(location)
  File "C:\dev\bzr\bzr.dev\bzrlib\directory_service.py", line 63, in dereference
    return service().look_up(name, url)
  File "C:\dev\bzr\bzr.dev\bzrlib\plugins\launchpad\lp_directory.py", line 66, in look_up
    return self._resolve(url)
  File "C:\dev\bzr\bzr.dev\bzrlib\plugins\launchpad\lp_directory.py", line 199, in _resolve
    raise errors.InvalidURL(path=url, extra='no supported schemes')
InvalidURL: Invalid url supplied to transport: "bzr+ssh://bazaar.launchpad.net/+branch/bzr-rewrite": no supported scheme
s

Note that I can reproduce this failure on my local machine, if I comment out my "launchpad_username". And it fails with both bzr-2.2.2 on the Build machine, and with bzr-2.5.0dev2 rev 6143 on my local machine (and on the build machine).

Going further, it actually fails if I set my launchpad username:
$ bzr info lp:bzr-rewrite -Derror
Connected (version 2.0, client Twisted)
Authentication (publickey) successful!
Secsh channel 1 opened.
Transferred: 1kB (0.2kB/s r:0kB w:0kB)
bzr: ERROR: bzrlib.errors.NotBranchError: Not a branch: "bzr+ssh://bazaar.launchpad.net/+branch/bzr-rewrite/".

Traceback (most recent call last):
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 918, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 1118, in run_bzr
    ret = run(*run_argv)
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 676, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 698, in run
    return self._operation.run_simple(*args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\commands.py", line 1133, in ignore_pipe
    result = func(*args, **kwargs)
  File "C:\dev\bzr\bzr.dev\bzrlib\builtins.py", line 1595, in run
    show_bzrdir_info(bzrdir.BzrDir.open_containing(location)[0],
  File "C:\dev\bzr\bzr.dev\bzrlib\bzrdir.py", line 874, in open_containing
    return BzrDir.open_containing_from_transport(transport)
  File "C:\dev\bzr\bzr.dev\bzrlib\bzrdir.py", line 906, in open_containing_from_transport
    raise errors.NotBranchError(path=url)
NotBranchError: Not a branch: "bzr+ssh://bazaar.launchpad.net/+branch/bzr-rewrite/".
HPSS calls: 3 (0 vfs) SmartSSHClientMedium(bzr+ssh://<email address hidden>/)

Looking at:
  https://launchpad.net/bzr-rewrite/trunk

It looks like the trunk development series no longer has an associated branch. I'll try to follow up with Jelmer to sort this out.

(This may not be a bzr bug, but I'm marking it Critical because I can't build the bzr-2.5 installers without fixing it.)

[John A Meinel (jameinel)]

Note that there probably is a bzr bug in here somewhere. Specifically the original failure case is quite confusing:
bzr: ERROR: Invalid url supplied to transport: "bzr+ssh://bazaar.launchpad.net/+branch/bzr-rewrite":
 no supported schemes

bzr+ssh certainly looks like it would be a supported scheme.

At least one bug is that the _resolve code is re-using the 'url' parameter, rather than raising the original url.

[John A Meinel (jameinel)]

The 'critical' part was that I couldn't access bzr-rewrite, which was just an issue that Jelmer hadn't linked the trunk branch after moving it.
The 'still a bug' part is that we give a confusing error when this sort of thing happens.