[CalendarServer-dev] twisted.internet.addressalready loaded, cannot load required backport

[Dennison Williams]

Hey all,

Running on the 4.2 branch I am getting the following exception (see
attached backtrace): exceptions.RuntimeError:
twisted.internet.addressalready loaded, cannot load required backport

This is repeated over and over again in the error log.  I see that this
is trigggered when call runtime patching the twisted library.  I do not
have the system python twisted library installed and I do not have a src
install of the twisted lib.  Only the one that gets installed when
running: run.sh -i /

Later on down in the input I also get the following exception (see
second backtrace):   exceptions.AttributeError: 'module' object has no
attribute 'backport'

Further on down in the file I get the following the help dump from
twistd and the following message: /usr/local/bin/twistd: Unknown
command: caldav

Any help is appreciated.
Sincerely,
Dennison Williams
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2013-02-08 15:32:09-0800 [-] LimitingInheritingProtocolFactory starting on 8008
2013-02-08 15:32:09-0800 [-] LimitingInheritingProtocolFactory starting on 8800
2013-02-08 15:32:09-0800 [-] LimitingInheritingProtocolFactory starting on 8443
2013-02-08 15:32:09-0800 [-] LimitingInheritingProtocolFactory starting on 8843
2013-02-08 15:32:09-0800 [-] Factory starting on 7654
2013-02-08 15:32:09-0800 [-] [calendarserver.tap.caldav.CalDAVServiceMaker#info] Adding notification service
2013-02-08 15:32:09-0800 [-] [calendarserver.tap.caldav.CalDAVServiceMaker#info] Adding group caching service
2013-02-08 15:32:10-0800 [-] [notifications] Unhandled Error
2013-02-08 15:32:10-0800 [-] [notifications] Traceback (most recent call last):
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 647, in run
2013-02-08 15:32:10-0800 [-] [notifications]     config.parseOptions()
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 614, in parseOptions
2013-02-08 15:32:10-0800 [-] [notifications]     usage.Options.parseOptions(self, options)
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/usage.py", line 261, in parseOptions
2013-02-08 15:32:10-0800 [-] [notifications]     for (cmd, short, parser, doc) in self.subCommands:
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 631, in subCommands
2013-02-08 15:32:10-0800 [-] [notifications]     for plug in sorted(plugins, key=attrgetter('tapname')):
2013-02-08 15:32:10-0800 [-] [notifications] --- <exception caught here> ---
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/plugin.py", line 213, in getPlugins
2013-02-08 15:32:10-0800 [-] [notifications]     adapted = interface(plugin, None)
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/lib/python2.7/dist-packages/zope/interface/interface.py", line 631, in _call_conform
2013-02-08 15:32:10-0800 [-] [notifications]     return conform(self)
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/plugin.py", line 68, in __conform__
2013-02-08 15:32:10-0800 [-] [notifications]     return self.load()
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/plugin.py", line 63, in load
2013-02-08 15:32:10-0800 [-] [notifications]     return namedAny(self.dropin.moduleName + '.' + self.name)
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/reflect.py", line 464, in namedAny
2013-02-08 15:32:10-0800 [-] [notifications]     topLevelPackage = _importAndCheckStack(trialname)
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/reflect.py", line 400, in _importAndCheckStack
2013-02-08 15:32:10-0800 [-] [notifications]     return __import__(importName)
2013-02-08 15:32:10-0800 [-] [notifications]   File "/usr/local/lib/python2.7/dist-packages/twisted/plugins/caldav.py", line 17, in <module>
2013-02-08 15:32:10-0800 [-] [notifications]     __import__("twext") # install patches before doing anything
2013-02-08 15:32:10-0800 [-] [notifications]   File "/opt/CalendarServer-4.2/twext/__init__.py", line 21, in <module>
2013-02-08 15:32:10-0800 [-] [notifications]     from twext import patches
2013-02-08 15:32:10-0800 [-] [notifications]   File "/opt/CalendarServer-4.2/twext/patches.py", line 78, in <module>
2013-02-08 15:32:10-0800 [-] [notifications]     _addBackports()
2013-02-08 15:32:10-0800 [-] [notifications]   File "/opt/CalendarServer-4.2/twext/patches.py", line 73, in _addBackports
2013-02-08 15:32:10-0800 [-] [notifications]     tiname + "already loaded, cannot load required backport")
2013-02-08 15:32:10-0800 [-] [notifications] exceptions.RuntimeError: twisted.internet.addressalready loaded, cannot load required backport

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2013-02-08 15:32:10-0800 [-] [caldav-1] Unhandled Error
2013-02-08 15:32:10-0800 [-] [caldav-1] Traceback (most recent call last):
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 647, in run
2013-02-08 15:32:10-0800 [-] [caldav-1]     config.parseOptions()
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 614, in parseOptions
2013-02-08 15:32:10-0800 [-] [caldav-1]     usage.Options.parseOptions(self, options)
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/usage.py", line 261, in parseOptions
2013-02-08 15:32:10-0800 [-] [caldav-1]     for (cmd, short, parser, doc) in self.subCommands:
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 631, in subCommands
2013-02-08 15:32:10-0800 [-] [caldav-1]     for plug in sorted(plugins, key=attrgetter('tapname')):
2013-02-08 15:32:10-0800 [-] [caldav-1] --- <exception caught here> ---
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/plugin.py", line 213, in getPlugins
2013-02-08 15:32:10-0800 [-] [caldav-1]     adapted = interface(plugin, None)
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/lib/python2.7/dist-packages/zope/interface/interface.py", line 631, in _call_conform
2013-02-08 15:32:10-0800 [-] [caldav-1]     return conform(self)
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/plugin.py", line 68, in __conform__
2013-02-08 15:32:10-0800 [-] [caldav-1]     return self.load()
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/plugin.py", line 63, in load
2013-02-08 15:32:10-0800 [-] [caldav-1]     return namedAny(self.dropin.moduleName + '.' + self.name)
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/reflect.py", line 464, in namedAny
2013-02-08 15:32:10-0800 [-] [caldav-1]     topLevelPackage = _importAndCheckStack(trialname)
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/reflect.py", line 400, in _importAndCheckStack
2013-02-08 15:32:10-0800 [-] [caldav-1]     return __import__(importName)
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/plugins/caldav.py", line 17, in <module>
2013-02-08 15:32:10-0800 [-] [caldav-1]     __import__("twext") # install patches before doing anything
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/opt/CalendarServer-4.2/twext/__init__.py", line 21, in <module>
2013-02-08 15:32:10-0800 [-] [caldav-1]     from twext import patches
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/opt/CalendarServer-4.2/twext/patches.py", line 78, in <module>
2013-02-08 15:32:10-0800 [-] [caldav-1]     _addBackports()
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/opt/CalendarServer-4.2/twext/patches.py", line 68, in _addBackports
2013-02-08 15:32:10-0800 [-] [caldav-1]     for submod in backports.iterModules():
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/modules.py", line 128, in iterModules
2013-02-08 15:32:10-0800 [-] [caldav-1]     for placeToLook in self._packagePaths():
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/modules.py", line 423, in _packagePaths
2013-02-08 15:32:10-0800 [-] [caldav-1]     load = self.load()
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/modules.py", line 383, in load
2013-02-08 15:32:10-0800 [-] [caldav-1]     return self.pathEntry.pythonPath.moduleLoader(self.name)
2013-02-08 15:32:10-0800 [-] [caldav-1]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/reflect.py", line 475, in namedAny
2013-02-08 15:32:10-0800 [-] [caldav-1]     obj = getattr(obj, n)
2013-02-08 15:32:10-0800 [-] [caldav-1] exceptions.AttributeError: 'module' object has no attribute 'backport'