`git config --user unset` errors b/c of ambiguous reference to/inconsistent precedence of user configs (`~/.pip/pip.conf` & `~/.config/pip/pip.conf`)

[Kache]

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Description

Pip is supposed to work with multiple "uesr configs", notably ~/.pip/pip.conf & ~/.config/pip/pip.conf. However, pip is inconsistent when determining which one to use when running pip config --user unset.

See "How to Reproduce" for setup details.

Reference snippet: https://github.com/pypa/pip/blob/5efa3e83d90b1d64fbf0104d2ba84bef8d7e9648/src/pip/_internal/configuration.py#L181-L194

1. The config key check at L181 will pass b/c the key exists in ~/.pip/pip.conf
2. But parser retrieved on L184 is the one for ~/.config/pip/pip.conf, which doesn't exist
3. So parser.remove_option() will fail with KeyError/NoSectionError

I'm not familiar with pip internals, but this issue suggests other similar precedence issues may exist elsewhere.

Expected behavior

Pip should have found the setting in ~/.pip/pip.conf and removed it, especially since it's the value pip config get global.index-url reads.

Perhaps there should be a way to specify either/all/any of the user configs, but I imagine this could get messy and would probably take some design considerations.

pip version

pip 23.3.1

Python version

Python 3.11.4

OS

Darwin Kernel Version 22.6.0: Wed Jul 5 22:22:05 PDT 2023; root:xnu-8796.141.3~6/RELEASE_ARM64_T6000

How to Reproduce

~/.pip/pip.conf

[global]
index-url = https://foo.com/bar

~/.config exists, but not ~/.config/pip/

Output

$ pip config --user unset global.index-url
ERROR: Fatal Internal error [id=1]. Please report as a bug.

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