After Rick's failed verification comment I had been wondering if we'd
run into trouble with stale seed-app-data, and yes we have 2 different
regressions:
1. The new python-pip-whl breaks new virtualenv creation if you have existing
seed-app-data.
This was James's issue. Traceback ends with:
File "lib/python3.8/site-packages/pip/_internal/pyproject.py", line 8, in
<module>
from pip._vendor import pytoml, six
ImportError: cannot import name 'pytoml' from 'pip._vendor'
(lib/python3.8/site-packages/pip/_vendor/__init__.py)
2. The new virtualenv breaks new virtualenv creation if you have existing
seed-app-data.
File "lib/python3.8/site-packages/pip/_internal/exceptions.py", line 10, in
<module>
from pip._vendor.six import iteritems
ModuleNotFoundError: No module named 'pip._vendor.six'
Attached is my script to reproduce.
This is all pretty horrible. I'm tempted to patch out seed-app-data entirely
for our use-case. But
I see the whole seed-app-data mechanism was re-done in 20.0.24, hopefully it
will be more friendly to patching...
My solution is:
1. Bump the seed-app-data version in python3-virtualenv, to cache-bust.
2. Add a Breaks: python3-virtualenv (<< 20.0.17-1ubuntu0.3) (the version in 1)
to the new python-pip-whl.
** Attachment added: "Reproducer script"
https://bugs.launchpad.net/ubuntu/+source/python-pip/+bug/1880749/+attachment/5467765/+files/upgrade.sh
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https://bugs.launchpad.net/bugs/1880749
Title:
Ubuntu 20.04: virtualenv: pep517 requires toml, but it isn't bundled
in venvs
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