Log the resolved commit SHA when installing package via Git URI to make it easier to debug

What’s the problem this feature will solve?

Currently, when we install a package via Git URI, pip doesn’t tell us what the current commit SHA is:

$ pip install git+https://github.com/scikit-learn/scikit-learn.git
Collecting git+https://github.com/scikit-learn/scikit-learn.git
  Cloning https://github.com/scikit-learn/scikit-learn.git to /tmp/pip-req-build-lna_339q
  Running command git clone -q https://github.com/scikit-learn/scikit-learn.git /tmp/pip-req-build-lna_339q

Let’s say we run the command above in CI to run tests against the dev version of scikit-learn. If the current commit hash was shown, it would help us indetify commits/changes that break the tests.

Describe the solution you’d like

Just show the current commit SHA after cloning the repo.

Alternative Solutions

$ pip freeze | grep scikit-learn
scikit-learn @ git+https://github.com/scikit-learn/scikit-learn.git@f2fb07581339f063b501b3e820917d66ee4c1fa3

# However, this doesn't work for the following use case:
$ pip wheel git+https://github.com/scikit-learn/scikit-learn.git
$ pip install path/to/built/wheel
$ pip freeze | grep scikit-learn
scikit-learn @ file:/path/to/built/wheel

Additional context

[uranusjr]

IIRC (didn’t check) it’s already available in debug mode, and moving it to INFO does make sense to me. We also recently introduced a new verbose log level, so changing it to show in -v also makes sense. And if it wasn’t already present, we should add it.

A PR would be very welcomed!

[harupy]

Got it, I’ll file a PR!