fix: don't use pypi.org when pypi.url is set

[XYenon]

Pull Request Checklist

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Describe what you have changed in this PR.

Set index_urls and find_links when init finder. Fix #2560

[frostming]

Thanks for the patch. However, this fix doesn't seem right.

The approach intentionally is to keep the order of the source order defined in pyproject.toml. But this patch changes that.

You can clear the finder.sources before the for source in sources line.

[XYenon]

The approach intentionally is to keep the order of the source order defined in pyproject.toml.

If the order between index_urls and find_links is important, maybe unearth.PackageFinder should receive a sources parameter, rather than separate index_urls and find_links?

[frostming]

maybe unearth.PackageFinder should receive a sources parameter, rather than separate index_urls and find_links?

It already offers add_index_url and add_find_links for that purpose, directly specifying sources is a more difficult interface to users because the source has its own structure. We could, however, change it to initialize with an empty sources, but that requires changes on the unearth side. Please fix as the previous comment.

[audricsun]

I ran into this earlier today, and it's like it's caused by a upgrade from unearth, so I pinned down those to make it work on my side

pip install pdm unearth==0.12.1 urllib3==1.26.16