Skip pip upgrade notice on for OS package distributions

[mcandre]

When Python / pip are installed using operating system facing packages, such as RPM, apt, Homebrew, Chocolatey, and so on, then it might be a good idea to skip the pip upgrade notice. When a user actually follows the upgrade advice, they may enter a broken package state.

[chrahunt]

Thanks for thinking of this and bringing it up here. No joke, I had this same thought when going through issues recently. :)

IMO this is the responsibility of projects/distributions repackaging pip. I think it would be a lot of work to maintain code in pip to recognize whether it is system-managed for all the different systems, but trivial for maintainers of those downstream projects to carry a one-line patch defaulting --disable-pip-version-warning-check to True here.

[pradyunsg]

Thanks for filing this! I agree and this has been previously discussed in #5346.

[pradyunsg]

Given that #6468 provides a more general approach for this, I'm gonna go ahead and close this issue. :)