Disable virtualenv's download-by-default in tox
Project description
tox-virtualenv-no-download
Disable virtualenv (>=14)'s downloading behaviour when running through tox.
Wait, why?
A few goals for test suites are repeatability and speed. In modern
versions of virtualenv (>=14), virtualenv
will reach out to pypi to download
the latest version of pip
, setuptools
, and wheel
even when it has a
perfectly good copy of the wheeled packages on disk.
A few reasons why downloading is problematic:
- Reaching out to the network is slow.
- pypi goes down quite often
- You may work in a situation where installation should not come from public pypi.
- If you don't have a network connection,
virtualenv
will outright fail. - Hurts repeatability as you may suddenly get a new version of
setuptools
/pip
setuptools
has been unstable in the past, breaking their latest version and compatibility.
How it works
The downloading behaviour of virtualenv
can be disabled either by calling
virtualenv --no-download
or by setting the environment variable
VIRTUALENV_NO_DOWNLOAD
. This tox plugin sets that environment variable
during the virtualenv creation.
Usage
$ pip install tox-virtualenv-no-download
# just use tox as you usually would
$ tox ...
Project details
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