SAGE_ROOT/tox.ini: Make tox -p auto and tox --listenvs useful again

[mkoeppe]

(from #29146)

tox does not actually understand the nested braces used in envlist.

https://groups.google.com/g/sage-devel/c/NU-xlUTIIdE/m/Q14HiKvNAgAJ

CC: @jhpalmieri @kliem

Component: porting

Author: Matthias Koeppe

Branch/Commit: 47a2b42

Reviewer: John Palmieri

Issue created by migration from https://trac.sagemath.org/ticket/32764

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Branch: u/mkoeppe/sage_root_tox_ini__make_tox__p_auto_and_tox___listenvs_useful_again

[sagetrac-git]

Commit: 5392cd7

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

5392cd7

tox.ini: Do not include the environments delegated to src/tox.ini in 'tox -p auto'

[mkoeppe]

comment:5

Here's an attempt at improving the tox -p auto situation and documentation.
Please feel free to push further changes to this ticket

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

47a2b42

tox.ini: Add more examples

[sagetrac-git]

Changed commit from 5392cd7 to 47a2b42

[jhpalmieri]

comment:9

Was the hope that the nested braces would allow testing all of the various combinations via tox -p auto?

[mkoeppe]

comment:10

Yes, and some early version of it did something like that. https://tox.wiki/en/latest/config.html#generative-section-names
Not sure if nesting ever worked.

[jhpalmieri]

comment:11

I could imagine expanding that environment list (since it's much shorter now than the original intention), but that can wait.

[jhpalmieri]

Reviewer: John Palmieri

[mkoeppe]

comment:12

Thanks!

[vbraun]

Changed branch from u/mkoeppe/sage_root_tox_ini__make_tox__p_auto_and_tox___listenvs_useful_again to 47a2b42