On 27. 07. 21 23:03, Neal Gompa wrote:
On Tue, Jul 27, 2021 at 5:09 AM Tomas Orsava <[email protected]> wrote:
If I understand what you're describing correctly, this is not a bug.
In the default state, /usr/bin/python should *not* exist, that's correct
behaviour. If you want it to exist, you need to configure it using alternatives
[0].
We considered making /usr/bin/python exist but be a noop, but that breaks a lot
of automated (build) tools that search for Python executables (they often start
with python, if not found search for python3, or python2, etc.).
And there was no reasonable default for Python in RHEL 8 because it sits
between the past (Python 2 default in RHEL 7) and the future (Python3 default
in RHEL 9). Either default would cause problems, often hidden and hard to debug
problems, for some subset of our customers.
[0]
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_basic_system_settings/assembly_configuring-the-unversioned-python_configuring-basic-system-settings
But this won't be a problem in RHEL 9, will it? I don't want to suffer
through this when we're not even going to have Python 2 in RHEL 9 at
all...
Not at all. We have reviewed all the RHEL 8 differences from Fedora and how
much painful they were/are and decided to play the "if we would not do this in
Fedora, we should not do it in RHEL 9 either" card. That includes
/usr/bin/python (optionally (un)installable but only one), platform-python
(don't), modularity (don't), and other things.
Some differences are still planned though, albeit hopefully minor:
1) We plan non-modular parallel-installable Python stacks in RHEL 9, but we
don't want to take care of such stacks in Fedora. However, we intent to fully
support this case for Fedora's downstreams (not only RHEL: any downstream, e.g.
even Copr repos):
https://bugzilla.redhat.com/show_bug.cgi?id=1821489
2) We need some upgrade-path compatibility shims from RHEL 8's platform-python
that are not needed in Fedora and we plan to include them in RHEL 9 only:
https://bugzilla.redhat.com/show_bug.cgi?id=1891487
3) In Fedora, various Python interpreters use pip/setuptools/wheel wheels from
/usr/share/python-wheels or bundle their own wheel when the "general" ones are
too new to work with old Pythons. Given the differences of life cycle of RHEL
and Fedora, we plan to use wheels from /usr/share/python3.X-wheels instead (and
have the possibility to build newer versions of pip/setuptools/wheel wheels for
each newer Python version we introduce to RHEL 9). RHEL 8 already partially
does that for Python 3.8+, but in RHEL 9, we want to do this from the
beginning. I intent to do the rpm-macros-groundwork for this in Fedora, but we
might need to explicitly not make this change in ELN to preserve Rawhide/ELN
builds compatibility.
https://bugzilla.redhat.com/show_bug.cgi?id=1982668
Usual disclaimer applies: Those are our plans as engineers, not promises by Red
Hat as a company.
--
Miro Hrončok
--
Phone: +420777974800
IRC: mhroncok
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