Uploads fail due to setuptools using wrong metadata version for license-file

[franzhaas]

Dear all,

I got this error when building and uploading my wheel with 0.5.5 to pypi.org.:

Upload failed with status code 400 Bad Request. Server says: 400 license-file introduced in metadata version 2.4, not 2.1. See https://packaging.python.org/specifications/core-metadata for more information.

But it does work for me with 0.5.4.

Accoridng to the release notes, with 0.5.5 uv started to use license-file, however I did not see a mention of moving the metadata version...

Any ideas?

Thanks in advance,
Franz

[konstin]

This is probably #9442: It's correct that you can only use license-file with metadata of at least version 2.4, but we were missing that field in the upload payload previously so pypi's validation didn't work. What build backend are you using?

[franzhaas]

Hi Konstin,

I use.:

[build-system]
requires = ["setuptools", "wheel", "setuptools-scm"]
build-backend = "setuptools.build_meta"

If it helps, the full project is located here.: https://github.com/MarketSquare/robotframework-construct

[FHU-yezi]

I got the same error with uv build used in building my project.

Here is the repo: https://github.com/FHU-yezi/sshared

The failed publish GitHub Action flow: https://github.com/FHU-yezi/sshared/actions/runs/12078435589/job/33682841905

It is a pure Python package and I got this error after updated to the latest uv version.

[konstin]

This is a bug in setuptools: pypa/setuptools#4759

uv unfortunately can't do anything about this.

[franzhaas]

Ok thanks. Any ideas how to have dynamic versioning without setuptools? konsti ***@***.***> schrieb am Fr., 29. Nov. 2024, 11:42:

…

This is a bug in setuptools: pypa/setuptools#4759 <pypa/setuptools#4759> uv unfortunately can't do anything about this. — Reply to this email directly, view it on GitHub <#9513 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACXSBILVY5IYIXHUHCKUNST2DBAH5AVCNFSM6AAAAABSVWJU6KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDKMBXGU2DGNRZGQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[my1e5]

@franzhaas versioningit works with setuptools and also hatchling.

[franzhaas]

I did not try to upload, but when building with hatchling, I ended up using metadata 2.3... for both uv 0.5.4 and 0.5.5...

this might be related to this one.:
pypa/hatch#1819

[SermetPekin]

[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

fixed my issue. as @kbrgl suggested

[senges]

If you still want to use setuptools as build backend, a simple workaround is to explicitly provide an empty value for licence-files in your pyproject.toml:

[tool.setuptools]
license-files = []