change --user behaviour in a virtualenv

What’s the problem this feature will solve? subprocess call to pip with with --user in virtualenv currently throw an error

Describe the solution you’d like Replace the InstallationError triggered by virtualenv_no_global() with a debug message like in other cases

Alternative Solutions workaround is by construct pip3 install call dynamically

from pip._internal.utils.virtualenv import virtualenv_no_global
arg = '' if virtualenv_no_global() else '--user'

Additional context https://github.com/pypa/pip/blob/520e76ddb950e05c1b6e50b1108196c79c5e856f/src/pip/_internal/commands/install.py#L577

[RonnyPfannschmidt]

doing that would create a situation where a script error would silently install packages in a virtualenv instead of a user-site, as far as i can tell that would be absolutely unacceptable

[pradyunsg]

I’m gonna go ahead and close this out – this error is intentional, explicitly mentioned in the PEP/by the PEP author and designed to avoid modifying the global/user environment when running within a virtual environment.

Any discussion about changes to how the user site-packages are handled should take place on python-dev or discuss.python.org, not this issue tracker.

Any configuration handling related changes can use #7902 for discussion.