Python2 becomes end-of-live upstream, and Debian aims to remove
Python2 from the distribution, as discussed in
https://lists.debian.org/debian-python/2019/07/msg00080.html

We will keep some Python2 package as discussed in
https://lists.debian.org/debian-python/2020/07/msg00039.html
but removing the unversioned python packages python-minimal, python,
python-dev, python-dbg, python-doc.

Your package either build-depends, depends on one of those packages.
Please either convert these packages to Python3, or if that is not
possible, replaces the dependencies on the unversioned Python
packages with one of the python2 dependencies (python2, python2-dev,
python2-dbg, python2-doc).

Please check for dependencies, build dependencies AND autopkg tests.

If there are questions, please refer to the wiki page for the removal:
https://wiki.debian.org/Python/2Removal, or ask for help on IRC
#debian-python, or the debian-python@lists.debian.org mailing list.

This is obsolete version of obs-build which is no longer used or
maintained upstream. It has long moved on to python3 version, which
are still not packaged yet in Debian.

Ditto other things in the same stack i.e. dnf / zypper / yum / rpm.

Please RM obs-build, and somebody who still cares about OBS tooling in
Debian might want to repackage this.

Note that OBS upstream do provide Debian & Ubuntu repositories with up
to date tooling, which is readily available and at this point in time,
recommended to be used.

I've stopped using OBS years ago.

Please don't RM it, I'll update it shortly.

The most recent version in Debian Sid is 20190710-1
https://packages.debian.org/sid/obs-build

Upstream has had quite a few releases since then. It would be good to get a
2020 release of obs-build into Debian Bullseye.

https://github.com/openSUSE/obs-build/releases