Re: Questions regarding Python packaging

[Tanguy LE CARROUR]

Hi Guix, hi Lars,


Excerpts from Tanguy LE CARROUR's message of January 6, 2021 4:32 pm:
> Excerpts from Lars-Dominik Braun's message of January 5, 2021 11:25 am:
>>> So, I've tried packaging `python-keyring` with those two…
>>> 
>>> `pep517` keeps on trying to download dependencies, which won't work.
>>> 
>>> `build` crashes with "ZIP does not support timestamps before 1980",
>>> which, I guess is related to the fact that everything in the store is
>>> timestamped to January 1st 1970.
>> have you been looking into a python-build-system using `build`[1]? I’ve
>> had the same issue with egg versions set to 0.0.0 and think in the long
>> run moving to a PEP 517-style build is the way forward.
> 
> I agree! Unfortunately, I haven't had much time (so far) to work on it! :-(
> 
> I'll revive the thread as soon as I've made progress…

Done! :-)
I've eventually succeeded in ("properly") packaging a software managed
with Poetry. And I've learned quite a lot on the way!

Following Efraim's presentation on Guix Day, I've added a `guix.scm`
file to one of my pet projects. Any Guix user should be able to build it.

```bash
$ git clone https://gitlab.com/TanguyEE/nowty.git
Cloning into 'nowty'...
[…]

$ cd nowty/
$ guix build --file=guix.scm
[…]
successfully built /gnu/store/[…]-nowty-0.1.0a0+2d656ef.drv
/gnu/store/[…]-nowty-0.1.0a0+2d656ef

$ /gnu/store/[…]-nowty-0.1.0a0+2d656ef/bin/nowty
'High Hopes' from album 'Pray for the Wicked' by 'Panic! at the Disco'.
```

Regarding the package definition:
- the `build` phase updates the package version in `pyproject.toml` ;
- the `install` phase uses `pip` which in turn uses the build system
  from `poetry-core`.

I know that the phase names don't make much sense! … but it's a
work in progress ! :-)

Any comment welcome.

Regards,

-- 
Tanguy