[regression][20.0.11] RuntimeError: failed to find interpreter for Builtin discover of python_spec='.tox/bin/python'

[webknjaz]

Issue

It looks like the regression manifests itself when combined with tox.
Here's a GitHub Actions log: https://github.com/ansible/ansible-lint/runs/518006247?check_suite_focus=true#step:7:13.

Environment

Provide at least:

• OS: Ubuntu and macOS @ GitHub Actions

• pip list of the host python where virtualenv is installed:

  appdirs==1.4.3
  distlib==0.3.0
  filelock==3.0.12
  importlib-metadata==1.5.0
  importlib-resources==1.3.1
  packaging==20.3
  pip==20.0.2
  pluggy==0.13.1
  py==1.8.1
  pyparsing==2.4.6
  setuptools==28.8.0
  six==1.14.0
  toml==0.10.0
  tox==3.14.5
  virtualenv==20.0.11
  zipp==1.2.0

Output of the virtual environment creation

Make sure to run the creation with -vvv --with-traceback: Not sure how to do this with tox.

[gaborbernat]

Fixed with #1734, released under https://pypi.org/project/virtualenv/20.0.12/