Do not set TMPDIR when exporting to requirements.txt

[cjolowicz]

Do not set or modify TMPDIR in Nox sessions. nox-poetry should not modify the environment of users. Fiddling with TMPDIR can also lead to issues with other tools, especially since it happened at unpredictable points in the build process.

Previously, nox-poetry set TMPDIR indirectly by invoking session.create_tmp from export_requirements. We continue to use <venv>/tmp but create it ourselves instead of using session.create_tmp.

Closes #249

[brechtm]

Previously, nox-poetry set TMPDIR indirectly by invoking session.create_tmp from export_requirements. We continue to use /tmp but create it ourselves instead of using session.create_tmp.

Just a small note. TMPDIR used to be .nox/tmp. Now it's .nox/<session>/tmp.

[cjolowicz]

Previously, nox-poetry set TMPDIR indirectly by invoking session.create_tmp from export_requirements. We continue to use /tmp but create it ourselves instead of using session.create_tmp.

Just a small note. TMPDIR used to be .nox/tmp. Now it's .nox/<session>/tmp.

@brechtm I don't think so. Try this with the previous version:

from nox_poetry import session

@session
def test(session):
    session.poetry.export_requirements()
    session.run("python", "-c", """import os; print(f"{os.environ['TMPDIR'] = }")""")

Here's the output I get:

os.environ['TMPDIR'] = '.nox/test/tmp'

We just used nox.Session.create_tmp which uses .nox/<session>/tmp.

[brechtm]

Ah, yes. During my testing I adjusted the nox-poetry code to create and use the .nox/tmp directory, which I why I remember seeing it :-)