[Bug]: uv installation seems broken for nightly wheels (dependency problem with `outlines` and filename<>metadata mismatch)

[vadimkantorov]

Your current environment

# pyproject.toml - a single file in curdir

[build-system]
requires = ["setuptools>=65", "wheel"]
build-backend = "setuptools.build_meta"

[project]
name =  "test_vllm"
version = "0.0.0.1"
requires-python = ">=3.12"
dependencies = [
    "vllm",
    "torch>=2.8",
    "flash-attn==2.8.2",
]

[tool.uv.sources]
vllm = { url = "https://vllm-wheels.s3.amazonaws.com/038e9be4eb7a63189c8980845d80cb96957b9919/vllm-1.0.0.dev-cp38-abi3-manylinux1_x86_64.whl" }

🐛 Describe the bug

Following:

• Update PyTorch to 2.8.0 #20358 (comment)

Installing pyproject.toml (uv sync --active) leads to a nasty error:

  × No solution found when resolving dependencies:
  ╰─▶ Because outlines==0.1.11 depends on outlines-core==0.1.26 and vllm==0.10.1rc2.dev397+g038e9be4e depends on
      outlines{platform_machine == 's390x'}==0.1.11, we can conclude that vllm==0.10.1rc2.dev397+g038e9be4e and
      outlines-core{platform_machine != 's390x'}==0.2.10 are incompatible.
      And because vllm==0.10.1rc2.dev397+g038e9be4e depends on outlines-core{platform_machine != 's390x'}==0.2.10, we can
      conclude that vllm==0.10.1rc2.dev397+g038e9be4e cannot be used.
      And because only vllm==0.10.1rc2.dev397+g038e9be4e is available and your project depends on vllm, we can conclude
      that your project's requirements are unsatisfiable.

Appending to pyproject.toml the following:

[tool.uv]
override-dependencies = ["outlines-core==0.2.10"]

and rerunning uv sync --active gives a new nasty error (might be related to astral-sh/uv#8082):

error: Failed to install: vllm-1.0.0.dev0-cp38-abi3-manylinux1_x86_64.whl (vllm==1.0.0.dev0 (from https://vllm-wheels.s3.amazonaws.com/038e9be4eb7a63189c8980845d80cb96957b9919/vllm-1.0.0.dev-cp38-abi3-manylinux1_x86_64.whl))
  Caused by: Wheel version does not match filename: 0.10.1rc2.dev397+g038e9be4e != 1.0.0.dev0

and rerunning uv sync --active is becoming broken due to a fresh-new nasty error (might be a uv bug?):

error: Failed to parse `uv.lock`
  Caused by: The entry for package `vllm` v0.10.1rc2.dev397+g038e9be4e has wheel `vllm-1.0.0.dev0-cp38-abi3-manylinux1_x86_64.whl` with inconsistent version: v1.0.0.dev0

Before submitting a new issue...

• Make sure you already searched for relevant issues, and asked the chatbot living at the bottom right corner of the documentation page, which can answer lots of frequently asked questions.

[vadimkantorov]

It appears that vllm (at least) nightly wheels are breaking filename <> metadata consistency which makes it fail with uv :(

And outlines transitive hell seems to be a separate issue

[vadimkantorov]

This seems to have been discussed in:

• [Bug]: 1.0.0.dev placeholder doesn't work with uv pip install #9244

But what's missing is a complete pyproject.toml example for pinning a given nightly commit. What's also important is to be able to specify index only for vllm, so that it doesn't affect other packages.