A way to display the current configuration would be useful

[jerith]

At the moment, there's no easy way to determine what config options pip will use. It would be useful to have a showconfig command (or something similar) that outputs all available configuration options and the value they have at runtime, after applying config files, environment variables, command line parameters, and whatever else might influence them.

(For context, I wanted to write a script that removed certain cached wheels and was unable to determine programmatically where the cache dir is.)

[dstufft]

Closing this as a duplicate of #1736.