tox py3 virtualenv jobs failing ImportError cannot import name 'ContextManager'

[Marios Andreou]

Many cases blocking the gate at [1][2][3][4] (and many more) all tox jobs seems affected pep8 py27 py35 lower-constraints with not much of a trace like:

        action: py35, msg: getenv
        cwd: /home/zuul/src/opendev.org/openstack/tripleo-common/.tox
        cmd: /usr/bin/python3 -m virtualenv --no-download --python /usr/bin/python3 py35
        ImportError: cannot import name 'ContextManager'

in each case is it a difference command but failing with the same ImportError... eg cmd: /usr/bin/python3 -m virtualenv --no-download --python /usr/bin/python3 pep8

[1] https://d71803c35054f6f7d0b6-b1d67c9914c74169e0b954ab718a0da5.ssl.cf5.rackcdn.com/704655/1/gate/openstack-tox-pep8/6640440/tox/pep8-0.log
[2] https://2319feb14e831f87c231-4854ed941a7816d1225c43ae9b456d0e.ssl.cf1.rackcdn.com/704655/1/gate/openstack-tox-py27/9136e68/tox/py27-0.log
[3] https://3c89d7bbb96270f0f116-51b18fcc89837fbadd0245724df9c686.ssl.cf5.rackcdn.com/710314/1/gate/tox-py35/5410239/tox/py35-0.log
[4] https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_513/710314/1/gate/openstack-tox-lower-constraints/513c920/tox/lower-constraints-0.log

[Marios Andreou (marios-b)]

just saw a mailing list thread at http://lists.openstack.org/pipermail/openstack-discuss/2020-March/012942.html about that

[Marios Andreou (marios-b)]

seems like the current workaround is to pin importlib-resources to 1.0.2 https://review.opendev.org/#/c/710851/3/playbooks/base/pre.yaml

[Marios Andreou (marios-b)]

i think this is fixed with https://review.opendev.org/#/c/710851/3/playbooks/base/pre.yaml don't see it any more in zuul jobs/grafana

[Marios Andreou (marios-b)]

removing alert

[wes hayutin (weshayutin)]

Master should move jobs from py35 to py36

[Marios Andreou (marios-b)]

hmmm still seeing this a bit on stable/rocky e.g. there https://review.opendev.org/#/c/710314/
but looks to be back green now in zuul builds
https://zuul.opendev.org/t/openstack/builds?job_name=tox-py35&project=openstack%2Ftripleo-heat-templates&branch=stable%2Frocky&job_name=openstack-tox-lower-constraints

not sure yet if we still need to move off py35 as per http://lists.openstack.org/pipermail/openstack-discuss/2020-March/012942.html

[Marios Andreou (marios-b)]

per comment #6 it looks ok the recheck at https://review.opendev.org/#/c/710314/ was green