Hello,
Marius Bakke <mba...@fastmail.com> writes:
> Tanguy Le Carrour <tan...@bioneland.org> writes:
>
>> Hi Guix!
>>
>> I'm working on updating python-pytest and… not everything is going as
>> smoothly as I was expecting! :-(
>>
>> Pytest 5.2.1 depends on Pluggy >=0.12.0… which depends on
>> importlib-metadata. But when I had the latter as a propagated-input to
>> python-pluggy, then `guix build` gets stuck.
>>
>> diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
>> index a7f83dcd31..ab80cdebf9 100644
>> --- a/gnu/packages/python-xyz.scm
>> +++ b/gnu/packages/python-xyz.scm
>> @@ -8914,17 +8914,19 @@ library as well as on the command line.")
>> (define-public python-pluggy
>> (package
>> (name "python-pluggy")
>> - (version "0.11.0")
>> + (version "0.13.0")
>> (source
>> (origin
>> (method url-fetch)
>> (uri (pypi-uri "pluggy" version))
>> (sha256
>> (base32
>> - "10511a54dvafw1jrk75mrhml53c7b7w4yaw7241696lc2hfvr895"))))
>> + "0d4gsvb4kjqhiqqi4bbsdp7s1xlyl5phibcw1q1mrpd65xia2pzs"))))
>> (build-system python-build-system)
>> (native-inputs
>> `(("python-setuptools-scm" ,python-setuptools-scm)))
>> + (propagated-inputs
>> + `(("python-importlib-metadata" ,python-importlib-metadata)))
>> (synopsis "Plugin and hook calling mechanism for Python")
>> (description "Pluggy is an extraction of the plugin manager as used
>> by
>> Pytest but stripped of Pytest specific details.")
>>
>> The problem seems to be that python-importlib-metadata's dependency graph
>> contains… python-pluggy!
>>
>> How am I supposed to fix this chicken and egg situation?! Is this
>> something that should be notified to upstream?!
>
> It would be great if you can make upstream aware of the issue.
>
> Note that if you just want to be able to use Pytest 5.x on the master
> branch, you can instead add a separate 'python-pluggy-0.13' variable and
> use that for 'python-pytest-5'.
>
> We'll still need to break the cycle in 'core-updates' though...
I too had looked into updating python-pytest, and realized the same
thing. There's a way out, though. Python 3.8.0 will include
'import-metadata' as a core library [0].
Let's package Python 3.8.0 on core-updates!
[0] https://docs.python.org/3/whatsnew/3.8.html#new-modules
Maxim
