Hook for pyenv activate

[danfrankj]

I would like to be able to add a hook script when pyenv activate runs. In particular it would be helpful for me to be able to modify some environment vars.

It appears that some commands have such hooks: https://github.com/pyenv/pyenv-virtualenv/blob/master/bin/pyenv-virtualenv#L515

Let me know if you'd be open to adding such functionality to activate. Happy to create a PR if so

See also: https://github.com/pyenv/pyenv/issues/2337

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Prerequisite

• [X] Make sure your problem is not listed in the common build problems.
• [X] Make sure no duplicated issue has already been reported in the pyenv-virtualenv issues. You should look in closed issues, too.
• [X] Make sure you are not asking us to help solving your specific issue.
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Description

• [ ] Platform information (e.g. Ubuntu Linux 20.04):
• [ ] OS architecture (e.g. amd64):
• [ ] pyenv version:
• [ ] pyenv-virtualenv version:
• [ ] Python version:
• [ ] virtualenv version (if installed):
• [ ] Please attach the debug log of a faulty Pyenv invocation as a gist
  • If the problem happens in a Pyenv invocation, you can turn on debug logging by setting PYENV_DEBUG=1, e.g. env PYENV_DEBUG=1 pyenv install -v 3.6.4
  • If the problem happens outside of a Pyenv invocation, get the debug log like this:

    export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
    set -x
    <reproduce the problem>
    set +x
    

[native-api]

@yyuu has approved it in https://github.com/pyenv/pyenv/issues/2337#issuecomment-1107797056. I trust his judgement here so no objections from me, either.

Go ahead but do heed his warnings about possible side effects -- in particular, think carefully where exactly to insert the call point so that it's potentially useful for more use cases than just yours and how to name and/or where to locate the hook executables to avoid confusion.

[williamtwomey]

+1 This would be really helpful - currently I just source the 'activate' script to work around this, would be nice to just use the pyenv tooling.