[openstack-dev] [neutron][neutron-*] Notice! pylint breakage

Paul Michali pc at michali.net
Tue Dec 1 14:50:55 UTC 2015

Some additional info...

astroid upstream folks are going to try to push for pylint 1.4.5 that pins
to astroid 1.3.8. If that happens, we could just pin pylint at 1.4.5. Ref:

It sounds like we don't need to pin versions for Juno. My attempt seems to
be failing tests (badly) https://review.openstack.org/#/c/251865.

The neutron kilo patch seems ready to go, once the infra commit is
upstreamed: https://review.openstack.org/#/c/251827/

Infra commits are: https://review.openstack.org/#/c/251599/ (juno) and
https://review.openstack.org/#/c/251600/ (kilo). Need to (at least) get
kilo upstreamed.

For master, LB and VPN repos are broken. I can see these options

   1. implement pep8 constraints (takes time)
   2. ignore pylint errors/warnings until do #1  (less coverage)
   3. disable pylint until do #1 (no coverage)
   4. Fix the pylint 1.5.0 errors (will be an issue when go to pylint 1.4.4
   as part of #1)

I'm thinking #2 is the least intrusive, and will try that for VPN repo.

BTW: FW repo does not do 'pylint' as part of pep8 (essentially #3 option)
currently, so they don't see this carnage.


Paul Michali (pc_m)

On Tue, Dec 1, 2015 at 6:44 AM Paul Michali <pc at michali.net> wrote:

> I found a problem yesterday running pep8 locally in neutron-lbaas. After
> discussing with LBaaS team, we identified that there is a problem with
> pylint.  The same issues were seen, when hecking in neutron and
> neutron-vpnaas repos (need to check neutron-fwaas). There are two issues
> seen.
> First, the new version of pylint (1.5.0) is finding additional
> warnings/errors. This will require updates to code, to be compliant with
> the new pylint (assuming we move up to that version). I did see one case
> where the changes needed for pylint 1.5.0 are backward incompatible with
> pylint 1.4.4, which raises another concern (how to migrate to newer pylint).
> Second, pylint uses the astroid package, which was recently update from
> 1.3.8 to 1.4.1. When used with pylint 1.4.4 (the currently used version in
> neutron), we get all sorts of false positive errors. For example, use of
> each imported module shows a "undefined variable" error.
> In neutron-vpnaas, this issue is worse, as pylint iand astroid are not
> pinned to any version, so it can update at unexpected times.
> After talking to infra, here are the proposed solutions...
> Neutron - In pretty good shape
> The pep8-constraints job currently works, as global requirements in pylint
> to 1.4.4 and upper constraints pin astroid to 1.3.8 - both work together
> well.  Locally, one needs to use pep8-constraints and not pep8, as the
> latter will pull in the latest astroid (1.4.1) and cause havoc.
> Infra is pushing up two commits to global requirements to pin astroid to
> 1.3.8 for kilo (251600) and juno (251599). We need to pin astroid to 1.3.8
> in test-requirements.txt for those branches. I'll start on that in a few
> minutes.
> LBaaS/VPNaaS/FWaas? - Needs constraints
> For pep8 jobs, these repos need to use the new pep8-constraints style job
> and tox.ini should also use the same target, instead of pep8. Like neutron,
> kilo and juno branches need to pin astroid to 1.3.8.
> neutron-vpnaas should also pin pylint to 1.4.4 in test-requirements.txt,
> to prevent it from floating to 1.5.0.
> All repos will need a plan for updating code to conform to pylint 1.5.0,
> if/when we upgrade to this.
> Note: I have not looked at neutron-fwaas, so we need to confirm the above
> issue is present, but it likely is (even if there is not a current pylint
> failure).
> One concern I have, that infra hasn't figured out how it can be addressed,
> is how we'll update to pylint 1.5.0. If were are using pep8-constraints,
> the constraints file is in a different repo. Updating, to say, pylint 1.5.0
> and astroid 1.4.1, would cause breakage until both the neutron* repos and
> requirements repo are updated.  This is complicated with backward
> incompatible changes needed.
> Thanks to blogan, ZZelle, fungi, anteaya, lifeless, ajmiller and others
> for helping investigate and come up with the approach on this issue!
> Regards,
> Paul Michali (pc_m)
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