Allow symlinks with --find-links

[zackelia]

Summary

In my setup, I have a directory of wheels symlinked from different directories. I can point --find-links at it with pip and it works but not uv.

Currently, uv checks if a candidate file is_file which is for regular files. By also checking is_symlink I was able to install a symlinked wheel. I'm not exactly sure where, but some other place is eventually resolving the absolute path of the wheel. (uv? The OS?)

Test Plan

Manually tested - I didn't see any tests for FlatIndexClient in the uv-client crate.

mkdir /tmp/a /tmp/b                               # Create a directory of wheels (/tmp/a) and a directory of symlinked wheels (/tmp/b)
cp test-0.0.1-py3-none-any.whl /tmp/a             # Add a wheel to the directory of wheels
ln -s /tmp/a/test-0.0.1-py3-none-any.whl /tmp/b/  # Create a symlink to that wheel
uv pip install test --find-links /tmp/b           # Install pointing at the symlinked wheels directory

[charliermarsh]

Thanks!

[charliermarsh]

I tweaked this such that we still skip symlinked directories.