uv.lock source registry when using --extra-index-url and HTTP redirects

[gusutabopb]

Summary

I used uv add with an extra-index-url to add a package that is not present in the extra-index-url registry.

I expected uv to list the URL of the registry where the package actually lives as the "source".
However, in case the registry returns HTTP 303 responses, uv lists the extra-index-url (and not the default index = PyPI) as the "source".

Is there some reasoning to listing the extra-index-url as "source" when it actually isn't?

Details

I have an internal index/registry (e.g. registry.loc/simple) at work (running pypiserver), which contains just a few internal packages. It does not contain any packages that are available from PyPI.
In order for those internal packages to be uv add-able, I have extra-index-url on my uv.toml config.

However, to my surprise uv.lock lists all the dependencies on my projects as coming from this internal registry. That is, the source registry has the following for packages that were actually fetched from PyPI:

source = { registry = "http://registry.loc/simple" }

Doing some digging, I found out that the registry returns an HTTP 303 response (which is the default behavior of pypiserver),
But uv doesn't list the redirected URL registry as the "source". My expectation is that for dependencies/sub-depdendencies fetched from PyPI after a redirect would list PyPI as the "source":

source = { registry = "https://pypi.org/simple" }

Workarounds

• Remove extra-index-url from uv.toml and use it only when adding an internal package (e.g. my-lib)
  • This is not ideal as any PyPI-only dependencies of my-lib would still have the "wrong" source.
• Add the --disable-fallback flag to pypiserver so an HTTP 404 response is returned instead.
  • Results in my expected behavior, but requires control over the registry (which may not be realistic for many uv users)

Environment

> uv --version
uv 0.4.6 (84f25e8cf 2024-09-05)

[gusutabopb]

For full disclosure, here's a MRE.
Note that pydantic is not available from http://registry.loc/simple

uv init
uv add pydantic --extra-index-url http://registry.loc/simple

pyproject.toml

[project]
name = "uv-test"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.12"
dependencies = [
    "pydantic>=2.9.0",
]

uv.lock

When `registry.loc/simple` redirects (303)

version = 1
requires-python = ">=3.12"
resolution-markers = [
    "python_full_version < '3.13'",
    "python_full_version >= '3.13'",
]

[[package]]
name = "annotated-types"
version = "0.7.0"
source = { registry = "http://registry.loc/simple" }
sdist = { url = "https://files.pythonhosted.org/packages/ee/67/531ea369ba64dcff5ec9c3402f9f51bf748cec26dde048a2f973a4eea7f5/annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89", size = 16081 }
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version = "2.9.0"
source = { registry = "http://registry.loc/simple" }
dependencies = [
    { name = "annotated-types" },
    { name = "pydantic-core" },
    { name = "typing-extensions" },
    { name = "tzdata" },
]
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version = "2.23.2"
source = { registry = "http://registry.loc/simple" }
dependencies = [
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]
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[package.metadata]
requires-dist = [{ name = "pydantic", specifier = ">=2.9.0" }]

When `registry.loc/simple` does not redirect (404)

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[charliermarsh]

I would suggest inverting the order, such that your registry is the index-url and PyPI is the extra-index-url. In that case, we'll look at PyPI first, and only look at your registry for packages that don't exist on PyPI.

[gusutabopb]

Unfortunately, swapping out index-url and extra-index-url is not a feasible workaround in my case as the internal registry must have higher priority (checked first) as it contains a few packages that have name clashes with PyPI packages (completely different packages which happen to have a name that is already used in PyPI). Currently, the better workaround in my case is adding --disable-fallback to the instance of pypiserver running the internal registry.

However, my main points here are that the lock contents should:

1. Show the URL of the registry the package was actually fetched from.
2. Not change based on whether a registry returns 303 or 404 when a package is not found.
3. Not change based on whether extra-index-url was used or not when adding packages that do not depend on the extra-index-url at all (see the Pydantic example above).

All points boil down to how HTTP redirects are handled when writing the lock file.

[charliermarsh]

Honestly I'm not sure that it'd be correct for us to write the redirected URL to the lockfile. We write the correct paths for the actual distribution files of course, but it's true that we found the package by querying the pypiserver URL. It would be strange if users saw registries in the lockfile that weren't included as index URLs at all in their configuration.

[gusutabopb]

Fair enough. I can see how that could be strange in case the redirected registry wasn't the same as index-url (which happens to be my case).

I guess it could be argued what I considered an uv issue was just a pypiserver misconfiguration.

Also, this should become less of an issue once #171 is implemented.

Please feel free to close if the current behavior with regards to the different 303/404 handling is considered correct/expected.