[BUG] venv provisioning seems to enter an infinite loop under Python 3.8 with virtualenv==20.0.1 when pip is in requires #1518
Description
CI log: https://github.com/ansible/ansible-lint/pull/637/checks?check_run_id=438702207#step:6:30
[tox]
...
requires =
pip >= 19.3.0
$ TOXENV=docs python -m tox --parallel auto --notest
.tox create: /home/runner/work/ansible-lint/ansible-lint/.tox/.tox
.tox installdeps: setuptools >= 41.4.0, pip >= 19.3.0, tox >= 3.5.3
Traceback (most recent call last):
File "/opt/hostedtoolcache/Python/3.8.1/x64/lib/python3.8/runpy.py", line 193, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/opt/hostedtoolcache/Python/3.8.1/x64/lib/python3.8/runpy.py", line 86, in _run_code
exec(code, run_globals)
File "/home/runner/work/ansible-lint/ansible-lint/.tox/.tox/lib/python3.8/site-packages/tox/__main__.py", line 4, in <module>
tox.cmdline()
File "/home/runner/work/ansible-lint/ansible-lint/.tox/.tox/lib/python3.8/site-packages/tox/session/__init__.py", line 44, in cmdline
main(args)
File "/home/runner/work/ansible-lint/ansible-lint/.tox/.tox/lib/python3.8/site-packages/tox/session/__init__.py", line 64, in main
config = load_config(args)
File "/home/runner/work/ansible-lint/ansible-lint/.tox/.tox/lib/python3.8/site-packages/tox/session/__init__.py", line 80, in load_config
config = parseconfig(args)
File "/home/runner/work/ansible-lint/ansible-lint/.tox/.tox/lib/python3.8/site-packages/tox/config/__init__.py", line 266, in parseconfig
ParseIni(config, config_file, content)
File "/home/runner/work/ansible-lint/ansible-lint/.tox/.tox/lib/python3.8/site-packages/tox/config/__init__.py", line 1073, in __init__
self.handle_provision(config, reader)
File "/home/runner/work/ansible-lint/ansible-lint/.tox/.tox/lib/python3.8/site-packages/tox/config/__init__.py", line 1147, in handle_provision
deps = self.ensure_requires_satisfied(config, requires_list, min_version)
File "/home/runner/work/ansible-lint/ansible-lint/.tox/.tox/lib/python3.8/site-packages/tox/config/__init__.py", line 1193, in ensure_requires_satisfied
raise tox.exception.Error(msg.format(sys.executable, missing_requirements))
tox.exception.Error: Error: break infinite loop provisioning within /home/runner/work/ansible-lint/ansible-lint/.tox/.tox/bin/python missing ['pip>=19.3.0']
$ python -m pip freeze --all
appdirs==1.4.3
filelock==3.0.12
packaging==20.1
pip==20.0.2
pluggy==0.13.1
py==1.8.1
pyparsing==2.4.6
setuptools==41.2.0
six==1.14.0
toml==0.10.0
tox==3.14.3
virtualenv==20.0.1