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On 7/14/17, 5:18 PM, "Jeremy Stanley" <fungi at yuggoth.org> wrote:

>    Is there a mechanism to leverage this in tox or when invoking
>    virtualenv? We don't run get-pip.py in most jobs because our images
>    have pip/setuptools preinstalled to get around bootstrapping issues,
>    though I suppose that could with some effort be moved into job
>    runtime as a (very early) builder macro. Using constraints to
>    control these during image generation doesn't make a whole lot of
>    sense though as images are only rebuilt once a day and so tracking
>    these in the constraints list won't be self-testing in that regard
>    anyway.

Fair enough, although that’s what we have today so I don’t see it as worse. In fact, I think it’s an improvement because our constraints can be updated when we choose to (through the normal requirements management process) rather than whenever the new package releases.

I think it may make sense to do a pre-tox macro which preps pip/setuptools/wheel using get-pip.py, then places the relevant wheels into the virtualenv_support directory [1] so that tox uses them when building virtualenvs. Another option could be to use a configuration file [2] to specify a directory to find the right wheels in.

[1] https://virtualenv.pypa.io/en/stable/userguide/#the-extra-search-dir-option
[2] https://virtualenv.pypa.io/en/stable/reference/#configuration-file


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