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I would very much like to add python3-tomli to RHEL 8.

The currently shipped TOML-parsing module in python3-pytoml is deprecated in Fedora [1] and unwanted in RHEL 9+ [2]. Projects that wish to support RHEL 8 as well as Fedora and RHEL 9+ need to maintain a complex spaghetti of ifs or try-excepts to choose their TOML-parsing module.

Some Red Hat upstream projects even justify reverting community contributions to migrate to a modern and upstream-maintained TOML parser by the absence of tomli in RHEL 8 [3]. We don't want that. We want all upstreams to be able to switch to tomllib on Python 3.11+ with a fallback to tomli. In order to make that easier for them, we should make tomli available in RHEL 8.

The package is already available in EPEL 8 [4] where I helped with the initial review and the EPEL maintainer is on board with us introducing this package to RHEL proper [5].


[1] https://fedoraproject.org/wiki/Changes/DeprecatePytoml
[2] https://tiny.distro.builders/config-unwanted--sst_cs_apps-unwanted-python3.html
[3] https://github.com/containers/podman-py/pull/240
[4] https://src.fedoraproject.org/rpms/python-tomli/tree/epel8
[5] https://github.com/containers/podman-py/pull/240#issuecomment-1440308239

For context, `tomli` was added to the Python 3.11+ standard library as `tomllib`.
I reviewed it for inclusion there. It's written with decades of maintenance in mind.

Diff against EPEL 8: https://src.fedoraproject.org/rpms/python-tomli/pull-request/22

(In reply to Miro Hrončok from comment #6)
> Diff against EPEL 8:
> https://src.fedoraproject.org/rpms/python-tomli/pull-request/22

I went ahead and added a smoke test TMT plan to the PR as I anticipated it will be required.

With mock-core-configs at least 38.3-1.fc37 (currently a pending update):

$ mock -r centos-stream-8-x86_64 init
...
$ mock -r centos-stream-8-x86_64 --enablerepo=local install python3-tomli
...
Installed:
  python3-tomli-1.2.3-4.el8.noarch

$ repoquery -q --repo=c8s-appstream python3-tomli
python3-tomli-0:1.2.3-4.el8.noarch

$ repoquery -q --repo=RHEL8.9-AppStream python3-tomli
python3-tomli-0:1.2.3-4.el8.noarch

Yay \o/

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (python-tomli bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6911