Virtualenv name gets botched when PIPENV_PYTHON is a full path and WORKON_HOME is set

[aiguofer]

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Issue description

When trying to pipenv install using PIPENV_PYTHON=$HOME/.pyenv/shims/python and WORKON_HOME=$HOME/.pyenv/versions, the Project.virtualenv_name property includes slashes. This causes the virtualenv to get botched since it installs within nested directories.

Expected result

Generated virtualenv name is something that can be a reasonable folder name.

Actual result

❯ WORKON_HOME=$HOME/.pyenv/versions PIPENV_PYTHON=$HOME/.pyenv/shims/python PYENV_VERSION=3.7.7 pipenv install --dev
Creating a virtualenv for this project…
Pipfile: /Users/Diego/work/lucerna/test/Pipfile
Using /Users/Diego/.pyenv/shims/python (3.7.7) to create virtualenv…
⠦ Creating virtual environment...created virtual environment CPython3.7.7.final.0-64 in 691ms
  creator CPython3Posix(dest=/Users/Diego/.pyenv/versions/test-VgJQqnWV-/Users/Diego/.pyenv/shims/python, clear=False, global=False)
  seeder FromAppData(download=False, pip=latest, setuptools=latest, wheel=latest, via=copy, app_data_dir=/Users/Diego/Library/Application Support/virtualenv/seed-app-data/v1.0.1)
  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator

✔ Successfully created virtual environment!
Virtualenv location: /Users/Diego/.pyenv/versions/test-VgJQqnWV-/Users/Diego/.pyenv/shims/python

[techalchemy]

yikes, thanks for the report. I'm not sure what to consider this, it's an input sanitization issue I suppose. I'm not sure how often anyone is trying this.

Was this something you encountered organically? Was the range of possible values confusing?