On 02/13/2018 01:57 PM, Tom Barron wrote:
Since python 2.7 will not be maintained past 2020 [1] it is a reasonable
conjecture that downstream distributions
will drop support for python 2 between now and then, perhaps as early as
next year.
I'm not sure I agree. I suspect python 2 support will not go quietly
into that good night. Personally I anticipate a lot of kicking and
screaming right up to the end, especially from change averse enterprise
users.
But that's neither here nor there. I think we're all in agreement that
python 3 support is needed. :-)
In Pike, OpenStack projects, including TripleO, added python 3 unit
tests. That effort was a good start, but likely we can agree that it is
*only* a start to gaining confidence that real life TripleO deployments
will "just work" running python 3. As agreed in the TripleO community
meeting, this email is intended to kick off a discussion in advance of
PTG on what else needs to be done.
In this regard it is worth observing that TripleO currently only
supports CentOS deployments and CentOS won't have python 3 support until
RHEL does, which may be too late to test deploying with python3 before
support for python2 is dropped. Fedora does have support for python 3
and for this reason RDO has decided [2] to begin work to run with
*stabilized* Fedora repositories in the Rocky cycle, aiming to be ready
on time to migrate to Python 3 and support its use in downstream and
upstream CI pipelines.
So that means we'll never have Python 3 on CentOS 7 and we need to start
supporting Fedora again in order to do functional testing on py3?
That's potentially messy. My recollection of running TripleO CI on
Fedora is that it was, to put it nicely, a maintenance headache. Even
with the "stabilized" repos from RDO, TripleO has a knack for hitting
edge case bugs in a fast-moving distro like Fedora. I guess it's not
entirely clear to me what the exact plan is since there's some
discussion of frozen snapshots and such, which might address the
fast-moving part.
It also means more CI jobs, unless we're okay with dropping CentOS
support for some scenarios and switching them to Fedora. Given the
amount of changes between CentOS 7 and current Fedora that's a pretty
big gap in our testing.
I guess if RDO has chosen this path then we don't have much choice. As
far as next steps, the first thing that would need to be done is to get
TripleO running on Fedora again. I suggest starting with
https://github.com/openstack/instack-undercloud/blob/3e702f3bdfea21c69dc8184e690f26e142a13bff/instack_undercloud/undercloud.py#L1377
:-)
-Ben
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