Hello,

Because python-cryptography dont't work, calendarserver don't work.

arserver[2089]: Traceback (most recent call last):
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 579, in 
parseOptio
arserver[2089]:     usage.Options.parseOptions(self, options)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/usage.py", line 262, in 
parseOptions
arserver[2089]:     for (cmd, short, parser, doc) in self.subCommands:
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 596, in 
subCommand
arserver[2089]:     for plug in sorted(plugins, key=attrgetter('tapname')):
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/twisted/plugin.py", 
line 213, in getPlugins
arserver[2089]:     allDropins = getCache(package)
arserver[2089]: --- <exception caught here> ---
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/twisted/plugin.py", 
line 171, in getCache
arserver[2089]:     provider = pluginModule.load()
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/modules.py", line 389, in load
arserver[2089]:     return self.pathEntry.pythonPath.moduleLoader(self.name)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 303, in 
namedAny
arserver[2089]:     topLevelPackage = _importAndCheckStack(trialname)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 242, in 
_importAndC
arserver[2089]:     return __import__(importName)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/plugins/twisted_core.py", line 5, in 
<module
arserver[2089]:     from twisted.internet.endpoints import (
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/internet/endpoints.py", line 48, in 
<module>
arserver[2089]:     from twisted.protocols.tls import TLSMemoryBIOFactory
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/protocols/tls.py", line 41, in 
<module>
arserver[2089]:     from OpenSSL.SSL import Error, ZeroReturnError, 
WantReadError
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/OpenSSL/__init__.py", 
line 8, in <module>
arserver[2089]:     from OpenSSL import rand, crypto, SSL
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/OpenSSL/rand.py", line 
11, in <module>
 sam. 2016-05-14 21:09:01 CEST. --
d[1]: Starting LSB: Calendar and Contacts Server...
arserver[2089]: Unhandled Error
arserver[2089]: Traceback (most recent call last):
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 579, in 
parseOptio
arserver[2089]:     usage.Options.parseOptions(self, options)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/usage.py", line 262, in 
parseOptions
arserver[2089]:     for (cmd, short, parser, doc) in self.subCommands:
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 596, in 
subCommand
arserver[2089]:     for plug in sorted(plugins, key=attrgetter('tapname')):
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/twisted/plugin.py", 
line 213, in getPlugins
arserver[2089]:     allDropins = getCache(package)
arserver[2089]: --- <exception caught here> ---
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/twisted/plugin.py", 
line 171, in getCache
arserver[2089]:     provider = pluginModule.load()
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/modules.py", line 389, in load
arserver[2089]:     return self.pathEntry.pythonPath.moduleLoader(self.name)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 303, in 
namedAny
arserver[2089]:     topLevelPackage = _importAndCheckStack(trialname)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 242, in 
_importAndC
arserver[2089]:     return __import__(importName)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/plugins/twisted_core.py", line 5, in 
<module
arserver[2089]:     from twisted.internet.endpoints import (
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/internet/endpoints.py", line 48, in 
<module>
arserver[2089]:     from twisted.protocols.tls import TLSMemoryBIOFactory
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/protocols/tls.py", line 41, in 
<module>
arserver[2089]:     from OpenSSL.SSL import Error, ZeroReturnError, 
WantReadError
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/OpenSSL/__init__.py", 
line 8, in <module>
arserver[2089]:     from OpenSSL import rand, crypto, SSL
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/OpenSSL/rand.py", line 
11, in <module>
arserver[2089]:     from OpenSSL._util import (
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/OpenSSL/_util.py", 
line 6, in <module>
arserver[2089]:     from cryptography.hazmat.bindings.openssl.binding import 
Binding
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/cryptography/hazmat/bindings/openssl/binding.py",
 li
arserver[2089]:     error=-1)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/cryptography/hazmat/bindings/openssl/binding.py",
 li
arserver[2089]:     ffi.def_extern(name=name, **kwargs)(func)
arserver[2089]: exceptions.AttributeError: 'CompiledFFI' object has no 
attribute 'def_extern'
arserver[2089]: Traceback (most recent call last):
arserver[2089]:   File "/usr/bin/twistd", line 18, in <module>
arserver[2089]:     run()
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/scripts/twistd.py", line 29, in run
arserver[2089]:     app.run(runApp, ServerOptions)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 612, in run
arserver[2089]:     config.parseOptions()
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 579, in 
parseOptio
arserver[2089]:     usage.Options.parseOptions(self, options)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/usage.py", line 262, in 
parseOptions
arserver[2089]:     for (cmd, short, parser, doc) in self.subCommands:
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 596, in 
subCommand
arserver[2089]:     for plug in sorted(plugins, key=attrgetter('tapname')):
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/plugins/caldav.py", line 29, in 
getProperty
arserver[2089]:     return getattr(reflect.namedClass(self.serviceMakerClass), 
propname)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 168, in 
namedObject
arserver[2089]:     module = namedModule('.'.join(classSplit[:-1]))
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 154, in 
namedModule
arserver[2089]:     topLevel = __import__(name)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/calendarserver/tap/caldav.py", line 36, in 
<module>
arserver[2089]:     import OpenSSL
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/OpenSSL/__init__.py", 
line 8, in <module>
arserver[2089]:     from OpenSSL import rand, crypto, SSL
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/OpenSSL/rand.py", line 
11, in <module>
arserver[2089]:     from OpenSSL._util import (
arserver[2089]:   File "/usr/lib/python2.7/dist-packages/OpenSSL/_util.py", 
line 6, in <module>
arserver[2089]:     from cryptography.hazmat.bindings.openssl.binding import 
Binding
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/cryptography/hazmat/bindings/openssl/binding.py",
 li
arserver[2089]:     error=-1)
arserver[2089]:   File 
"/usr/lib/python2.7/dist-packages/cryptography/hazmat/bindings/openssl/binding.py",
 li
arserver[2089]:     ffi.def_extern(name=name, **kwargs)(func)
arserver[2089]: AttributeError: 'CompiledFFI' object has no attribute 
'def_extern'
d[1]: Started LSB: Calendar and Contacts Server.


Could you help me to fix this bug ?

Tanks for your support.

Best regards

Battant

** Also affects: python-cryptography (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1512792

Title:
  Pip crashes with cryptography/cffi/openssl error

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