transitionToTarget for an Ubuntu package yields HTTP 500 error

[Martin Pitt]

I cannot figure out how to use bug_task.transitionToTarget() with an Ubuntu package. The API doc just says it expects a bug_target object, but not how to get one. I tried (on staging):

>>> b = c.launchpad.bugs[341518]
>>> list(b.bug_tasks)
[<bug_task at https://api.staging.launchpad.net/beta/ubuntu/+bug/341518>]
>>> b.bug_tasks[0].target
<distribution at https://api.staging.launchpad.net/beta/ubuntu>

>>> b.bug_tasks[0].transitionToTarget(target=c.launchpad.distributions['ubuntu'].getSourcePackage(name='coreutils'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/dist-packages/launchpadlib/resource.py", line 349, in __call__
    url, in_representation, http_method, extra_headers=extra_headers)
  File "/usr/lib/python2.6/dist-packages/launchpadlib/_browser.py", line 212, in _request
    raise HTTPError(response, content)
launchpadlib.errors.HTTPError: HTTP Error 500: Internal Server Error

I also tried a link, but doesn't work either:

>>> b.bug_tasks[0].transitionToTarget(target='https://api.staging.launchpad.net/beta/ubuntu/+source/coreutils')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/dist-packages/launchpadlib/resource.py", line 349, in __call__
    url, in_representation, http_method, extra_headers=extra_headers)
  File "/usr/lib/python2.6/dist-packages/launchpadlib/_browser.py", line 212, in _request
    raise HTTPError(response, content)
launchpadlib.errors.HTTPError: HTTP Error 500: Internal Server Error

Am I doing something wrong here?

[Eleanor Berger (intellectronica)]

This is not a duplicate of bug #329917

[Kees Cook (kees)]

Comments from bug #329917:

Kees:
This appears to only fail when there is no package already assigned. I.e. if the task is "vlc (Ubuntu)" and I switch it to "linux", the API works. If the task is "Ubuntu" and I switch it to "linux", it fails.

Graham Binns:
This bug is happening because the NullBugTask code is being triggered. *Why* it's being triggered, I don't know. It's possible that this is a race condition, but that seems unlikely.

This needs to be dealt with quickly, as it's now causing quite a lot of problems.

[Eleanor Berger (intellectronica)]

This bug happens when you try to switch from a task on a distribution to a task on a distro package.

[Diogo Matsubara (matsubara)]

Fixed in devel r9622 <http://bazaar.launchpad.net/~launchpad-pqm/launchpad/devel/revision/9622>

[Brian Murray (brian-murray)]

Martin - I went ahead and cleaned up most of all the old apport-crash reports without a package using transitionToTarget and it is working fine. However, the retracer doesn't seem to be doing this now - do you know why?

[Martin Pitt (pitti)]

As I said, apport currently tries

                bug.bug_tasks[0].transitionToTarget(target=self.lp_distro.getSourcePackage(name="mysourcepackage"))

Perhaps it's the wrong datatype for the "target" argument? What did you use?

[Eleanor Berger (intellectronica)]

@pitti, yes that should be the correct argument type. Do you still get this problem now? The fix has been on edge for a couple of weeks already.

[Martin Pitt (pitti)]

Right, seems it's working now; I removed the try/except workaround from apport's trunk.

Thanks!