Global Installation Warning

[sujaldev]

What's the problem this feature will solve?

Often times I (and I presume many other people) forget to activate a virtual environment and accidentally install globally, flooding the bin folder with a lot of unnecessary files, which becomes annoying for tab to autocomplete. And there exist many other reasons to not install globally, depending on what you're doing.

Describe the solution you'd like

This could be a opt-in/opt-out feature, depending on what the consensus is, through the configuration file maybe?

$ pip install -r requirements.txt
WARNING: Installing globally! Proceed (y/N)? 

$ pip config set install.global-install-warning false
$ pip install -r requirements.txt
...

$ pip config set install.global-install-warning true
$ pip install -r requirements.txt
WARNING: Installing globally! Proceed (y/N)? 

Alternative Solutions

pip config set install.require-virtualenv true does more or less what I want but I think if there existed another option that does not just raise an error rather gives a warning and asks whether or not to proceed, that would be much more convenient.

Additional context

This might be helpful.

Code of Conduct

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