Problems to run nox doctest session behind proxy

[sivogel]

I have problems running the nox doctest session behind a proxy. The command "session.run("pip", "install", "numpy<2")" needs the proxy to be set. If I remove "with _clean_environment(session):"

[tyralla]

Could you please complete your error report?

However, I guess that we simply need to change this code:

    with _clean_environment(session):
        if numpy == "1":
            session.run("pip", "install", "numpy<2")
        elif numpy == "2":
            session.run("pip", "install", "numpy>1,<3")
        else:
            assert_never(numpy)
        session.run("python", "hydpy/tests/run_doctests.py", *session.posargs)

to that one:

    if numpy == "1":
        session.run("pip", "install", "numpy<2")
    elif numpy == "2":
        session.run("pip", "install", "numpy>1,<3")
    else:
        assert_never(numpy)
    with _clean_environment(session):
        session.run("python", "hydpy/tests/run_doctests.py", *session.posargs)

Could you please verify and, if it works, open a pull request?

[sivogel]

Oh pardon. Somehow the second part got lost: The following part did not work due to a SSL connection error (no proxy set for pip install)

with _clean_environment(session):
        if numpy == "1":
            session.run("pip", "install", "numpy<2")
        elif numpy == "2":
            session.run("pip", "install", "numpy>1,<3")

Removing the with _clean_environment(session): (from the whole statement) helped to run the session. Could you please explain why do you need the _clean_environment for the run_doctest session?

[tyralla]

I added the _clean_environment context manager to get the HydPy-Server doctests running, which were hanging in some cases when the environment variable HTTP_PROXY or HTTPS_PROXY was set. However, I don't know if it is still required after the change introduced in commit 7bb80bfd.

[sivogel]

In my case (behind a proxy) it is not needed (I run it without last week). But I think it also was no problem before, because localhost is added to my NO_PROXY environment variable. I think we can completely remove it.

[tyralla]

But removing _clean_environment would mean some nox sessions would not run if HTTP_PROXY is set without NO_PROXY being defined as you explained. We would have to explain this somewhere in the documentation. Hence, I see no advantage in removing _clean_environment compared to fixing the problem as suggested.

[sivogel]

I think setting up a proxy that ignores all local addresses is pretty standard. I would like to discuss this with Holger. He is more familiar this topic.