[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2740: Twisted 16.0.0 causes test failure when importing cryptography.exceptions

[Tahoe-LAFS]

#2740: Twisted 16.0.0 causes test failure when importing cryptography.exceptions
----------------------------------+---------------------------
 Reporter:  daira                 |          Owner:  daira
     Type:  defect                |         Status:  new
 Priority:  normal                |      Milestone:  undecided
Component:  packaging             |        Version:  1.10.2
 Keywords:  twisted cryptography  |  Launchpad Bug:
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 E.g. https://travis-ci.org/tahoe-lafs/tahoe-lafs/jobs/116153170#L1350 :

 {{{
 allmydata.test.test_client ... Traceback (most recent call last):
   File "/home/travis/build/tahoe-lafs/tahoe-lafs/support/lib/python2.7
 /site-packages/Twisted-16.0.0-py2.7-linux-
 x86_64.egg/twisted/trial/runner.py", line 511, in loadPackage
     module = modinfo.load()
   File "/home/travis/build/tahoe-lafs/tahoe-lafs/support/lib/python2.7
 /site-packages/Twisted-16.0.0-py2.7-linux-
 x86_64.egg/twisted/python/modules.py", line 389, in load
     return self.pathEntry.pythonPath.moduleLoader(self.name)
   File "/home/travis/build/tahoe-lafs/tahoe-lafs/support/lib/python2.7
 /site-packages/Twisted-16.0.0-py2.7-linux-
 x86_64.egg/twisted/python/reflect.py", line 303, in namedAny
     topLevelPackage = _importAndCheckStack(trialname)
   File "/home/travis/build/tahoe-lafs/tahoe-lafs/support/lib/python2.7
 /site-packages/Twisted-16.0.0-py2.7-linux-
 x86_64.egg/twisted/python/reflect.py", line 250, in _importAndCheckStack
     reraise(excValue, excTraceback)
   File "/home/travis/build/tahoe-lafs/tahoe-
 lafs/src/allmydata/test/test_client.py", line 11, in <module>
     from allmydata.frontends.auth import NeedRootcapLookupScheme
   File "/home/travis/build/tahoe-lafs/tahoe-
 lafs/src/allmydata/frontends/auth.py", line 8, in <module>
     from twisted.conch.ssh import keys
   File "/home/travis/build/tahoe-lafs/tahoe-lafs/support/lib/python2.7
 /site-packages/Twisted-16.0.0-py2.7-linux-
 x86_64.egg/twisted/conch/ssh/keys.py", line 16, in <module>
     from cryptography.exceptions import InvalidSignature
 exceptions.ImportError: No module named cryptography.exceptions
 }}}

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2740>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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