[MacPorts] #62501: py27-sqlalchemy @1.4.1_0 broke buildbot-0.8

[MacPorts]

#62501: py27-sqlalchemy @1.4.1_0 broke buildbot-0.8
------------------------+-----------------------------------------
 Reporter:  ryandesign  |      Owner:  stromnov
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.4
 Keywords:  elcapitan   |       Port:  py-sqlalchemy, buildbot-0.8
------------------------+-----------------------------------------
 py27-sqlalchemy @1.4.1_0 broke our buildbot-0.8 setup. I had to go back to
 py27-sqlalchemy @1.3.23_0 to prevent this from happening on buildmaster
 startup:

 {{{
 $ sudo -u buildbot env HOME=/opt/local/var/buildmaster TZ=UTC
 /opt/local/bin/twistd-2.7 --nodaemon --no_save --python=buildbot.tac
 :0: UserWarning: You do not have a working installation of the
 service_identity module: 'No module named service_identity'.  Please
 install it from <https://pypi.python.org/pypi/service_identity> and make
 sure all of its dependencies are satisfied.  Without the service_identity
 module, Twisted can perform only rudimentary TLS client hostname
 verification.  Many valid certificate/hostname mappings may be rejected.
 Unhandled Error
 Traceback (most recent call last):
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/twisted/application/app.py", line 674, in run
     runApp(config)
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/twisted/scripts/twistd.py", line 25, in runApp
     runner.run()
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/twisted/application/app.py", line 381, in run
     self.application = self.createOrGetApplication()
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/twisted/application/app.py", line 453, in
 createOrGetApplication
     application = getApplication(self.config, passphrase)
 --- <exception caught here> ---
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/twisted/application/app.py", line 464, in getApplication
     application = service.loadApplication(filename, style, passphrase)
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/twisted/application/service.py", line 416, in
 loadApplication
     application = sob.loadValueFromFile(filename, 'application')
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/twisted/persisted/sob.py", line 177, in loadValueFromFile
     eval(codeObj, d, d)
   File "buildbot.tac", line 4, in <module>
     from buildbot.master import BuildMaster
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/buildbot/master.py", line 38, in <module>
     from buildbot.db import connector
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/buildbot/db/connector.py", line 24, in <module>
     from buildbot.db import enginestrategy
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7
 /site-packages/buildbot/db/enginestrategy.py", line 62, in <module>
     class BuildbotEngineStrategy(strategies.ThreadLocalEngineStrategy):
 exceptions.AttributeError: 'module' object has no attribute
 'ThreadLocalEngineStrategy'


 Failed to load application: 'module' object has no attribute
 'ThreadLocalEngineStrategy'

 }}}

 Don't know if this is a bug in py-sqlalchemy or if buildbot-0.8 needs to
 be changed in some way to accommodate a py-sqlalchemy change.

 I'm not very familiar with python but a quick search suggested that
 unexpected `object has no attribute` messages might indicate a circular
 dependency between python files that include each other.

-- 
Ticket URL: <https://trac.macports.org/ticket/62501>
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