New submission from Marc Schlaich <marc.schla...@googlemail.com>:
Controlling a venv from the python.exe from another venv does not work since
3.7.2 on Windows. This is probably related to the change
bpo-34977: venv on Windows will now use a python.exe redirector rather than
copying the actual binaries from the base environment.
This is obviously related to bpo-35872, but this could be a different bug.
When a Python script in a venv wants to control another venv by running
commands like `another-venv\python.exe -m pip` with subprocess, python.exe is
not referencing the other venv. It is referencing to the venv the script
currently running from. This is probably because os.environ contains a
'__PYVENV_LAUNCHER__' which is pointing to the venv from the script.
This can be reproduced with pipx (https://github.com/pipxproject/pipx-app) by
running
pipx install --python "C:\Program Files (x86)\Python37-32\python.exe"
--verbose tox
This results in pip installing to venvs\pipx-app and not in venvs\tox.
I assume a simpler reproduction might be (but I cannot check this anymore as
I'm back on 3.7.1 right now):
C:\Program Files (x86)\Python37-32\python.exe -m venv
C:\Users\$USER\.local\pipx\venvs\tox
c:\users\$USER\.local\pipx\venvs\pipx-app\scripts\python.exe -c "import
subprocess;
subprocess.run(['C:\Users\$USER\.local\pipx\venvs\tox\Scripts\python.exe',
'-m', 'pip', 'install', 'tox'])"
Downstream bugreport in pipx is
https://github.com/pipxproject/pipx-app/issues/81.
----------
components: Library (Lib), Windows
messages: 334659
nosy: paul.moore, schlamar, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Controlling venv from venv no longer works in 3.7.2
type: behavior
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35873>
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