[CalendarServer-dev] calendarserver 9.0 incompatible with twisted 17.1.0 ?

[Glyph Lefkowitz]

> On Feb 19, 2017, at 9:04 AM, Axel Rau <Axel.Rau at Chaos1.DE> wrote:
> 
> After upgrading twisted from 16.6.0 to 17.1.0 I’m getting:
> 
> Starting caldavd.
> Traceback (most recent call last):
>  File "/usr/local/bin/twistd", line 6, in <module>
>    from pkg_resources import load_entry_point
>  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3019, in <module>
>    @_call_aside
>  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3003, in _call_aside
>    f(*args, **kwargs)
>  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3032, in _initialize_master_working_set
>    working_set = WorkingSet._build_master()
>  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 655, in _build_master
>    ws.require(__requires__)
>  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 963, in require
>    needed = self.resolve(parse_requirements(requirements))
>  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 849, in resolve
>    raise DistributionNotFound(req, requirers)
> pkg_resources.DistributionNotFound: The 'Automat>=0.3.0' distribution was not found and is required by Twisted
> /usr/local/etc/rc.d/caldavd: WARNING: failed to start caldavd
> 
> The FreeBSD twisted port, which my port depends on has following run-dependencies for 17.1.0:
> 	zope.interface>=3.6.0
> 	constantly>=15.1
> 	incremental>=16.10.1
> which  are satisfied. 
> 
> Is this another variant of the import race problem on FreeBSD?
> 
> Not all twisted applications require Automat, hence it seems to be unconditionally required here:
> 	https://github.com/twisted/twisted/blob/a2200c3bf53beaa2763fe13bc6a670d7cf941dea/src/twisted/python/_setup.py <https://github.com/twisted/twisted/blob/a2200c3bf53beaa2763fe13bc6a670d7cf941dea/src/twisted/python/_setup.py>


This is happening well before import; Twisted added Automat as a dependency.  If the FreeBSD port of Twisted is installing Twisted 17.1.0 without Automat, then it is broken and needs to be fixed.

-glyph