[requirements][oslo] Explicit requirement to setuptools.

Doug Hellmann doug at doughellmann.com
Fri Oct 16 03:06:58 UTC 2020



> On Oct 15, 2020, at 10:19 AM, Jeremy Stanley <fungi at yuggoth.org> wrote:
> 
> On 2020-10-15 08:39:15 -0500 (-0500), Matthew Thode wrote:
>>> On 20-10-15 12:56:34, Jeremy Stanley wrote:
>>>> On 2020-10-15 13:22:36 +0200 (+0200), Thomas Goirand wrote:
>>> [...]
>>>> IMO, this is a problem in downstream distributions, not in
>>>> OpenStack (unless this influences pip3).
>>>> 
>>>> In Debian, I did hard-wire an explicit build-dependency on
>>>> python3-setuptools on each and every package. I don't understand
>>>> why you haven't done the same thing.
>>> [...]
>>> 
>>> And even this isn't completely necessary... it's entirely possible
>>> for projects to only use PBR and setuptools for creating packages,
>>> but use other Python stdlib methods (e.g., importlib in Python 3.8)
>>> to access version information and related package metadata during
>>> runtime.
>> 
>> For a large majority of packages, setuptools is required because they
>> have entry-points.  This mostly includes all the clients, but also hits
>> some oslo packages as well.
> 
> https://docs.python.org/3/library/importlib.metadata.html#entry-points
> 
> Maybe time to start thinking about a cycle goal around that?

The latest version of stevedore already uses importlib.metadata instead of setuptools and quite a few of the libraries and services no longer need it either. 

https://review.opendev.org/#/q/topic:osc-performance+(status:open+OR+status:merged)

Doug
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