Description

I have three requirements files, as follows:

# requirements.txt
...

# test-requirements.txt
-r requirements.txt
...

# lint-requirements.txt
-r requirements.txt
-r test-requirements.txt
...

When attempting to pip install -r lint-requirements.txt, pip complains:

ERROR: .../requirements.txt recursively references itself in .../test-requirements.txt and again in .../lint-requirements.txt

even though there is no recursive reference here. This used to work fine prior to pip 24.3.

Expected behavior

pip should not report an error and instead should proceed with installation as usual.

pip version

24.3

Python version

3.9

OS

Linux

How to Reproduce

1. Place three example requirements files in a directory as above.
2. Run pip install -r lint-requirements.txt
3. Observe error.

Output

$ python3.9 -m pip install -r lint-requirements.txt -c constraints.txt
Defaulting to user installation because normal site-packages is not writeable
ERROR: <omitted>/requirements.txt recursively references itself in <omitted>/test-requirements.txt and again in <omitted>/lint-requirements.txt

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