Warn that direct URL will not be recorded when running setup.py install

[llamafilm]

Environment

• pip version: 20.2.4
• Python version: 3.7.9
• OS: Windows 10
• Running with Powershell in clean venv

Description
I forked a Github repo and made some minor changes. Then I installed from my own repo with pip, but pip freeze is not showing the full URL.

Expected behavior
It should show the full URL to the source repo, thanks to #7612. Some other repos are working correctly like this:

pip install git+https://github.com/pypa/packaging
...
pip freeze
GPUtil==1.4.0
packaging @ git+https://github.com/pypa/packaging@69855f324f58d7a421fc1791b7794dfa80cf519d
pyparsing==2.4.7

How to Reproduce

pip install git+https://github.com/llamafilm/gputil
Collecting git+https://github.com/llamafilm/gputil
  Cloning https://github.com/llamafilm/gputil to c:\users\elliott\appdata\local\temp\pip-req-build-gq70gug6
Using legacy 'setup.py install' for GPUtil, since package 'wheel' is not installed.
Installing collected packages: GPUtil
    Running setup.py install for GPUtil ... done
Successfully installed GPUtil-1.4.0

pip freeze
GPUtil==1.4.0

[uranusjr]

Marking as duplicate to #8176.

[llamafilm]

This is not the same as #8176. In this case pip list --format=freeze shows the same problem.

[uranusjr]

Oh your issue has one more twist. setup.py install does not know how to record URLs. Can you try

1. Uninstalling the package
2. pip install wheel
3. Install the package again

and check if freeze shows the URL?

[llamafilm]

Aha! That does work.

[uranusjr]

Maybe we can add a warning in this situation.

[uranusjr]

Tangentally related: setup.py install will be deprecated at some point (#8560).

[Mr-Pepe]

Quick update and summary:

The PR for this issue (#9208) has been closed after being stale for a year and this issue will be obsolete when setup.py install gets deprecated, which is scheduled for April 2023 according to #8559.