uv sync: Distribution markupsafe==3.0.2 @ registry+https://download.pytorch.org/whl/cpu can't be installed because it doesn't have a source distribution or wheel for the current platform

[jfaust]

Similar to #8922, but with uv sync. With the following pyproject.toml:

[project]
name = "uv-repro"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.11"
dependencies = ["jinja2==3.1.4"]

[tool.uv]
index-strategy = 'unsafe-best-match'
find-links = ['https://download.pytorch.org/whl/torch_stable.html']
extra-index-url = [
    'https://download.pytorch.org/whl/cpu',
]

I get:

Resolved 3 packages in 311ms
error: Distribution `markupsafe==3.0.2 @ registry+https://download.pytorch.org/whl/cpu` can't be installed because it doesn't have a source distribution or wheel for the current platform

If I add https://pypi.org/simple to the beginning of the extra-index-url list, the problem goes away.

[zanieb]

To confirm, I can reproduce this

❯ uv lock
Resolved 3 packages in 952ms
Removed anyio v4.6.2.post1
Removed certifi v2024.8.30
Removed example v0.1.0
Removed h11 v0.14.0
Removed httpcore v1.0.7
Removed httpx v0.28.0
Removed idna v3.10
Added jinja2 v3.1.4
Added markupsafe v3.0.2
Removed sniffio v1.3.1
Added uv-repro v0.1.0
❯ uv sync
Resolved 3 packages in 407ms
error: Distribution `markupsafe==3.0.2 @ registry+https://download.pytorch.org/whl/cpu` can't be installed because it doesn't have a source distribution or wheel for the current platform

The lock entry is

[[package]]
name = "markupsafe"
version = "3.0.2"
source = { registry = "https://download.pytorch.org/whl/cpu" }
wheels = [
    { url = "https://download.pytorch.org/whl/MarkupSafe-3.0.2-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:15ab75ef81add55874e7ab7055e9c397312385bd9ced94920f2802310c930396" },
]

[zanieb]

@charliermarsh looks like the universal resolver to account for wheels on additional indexes?

[zanieb]

@jfaust I think the recommendation here would be to use the new index APIs and be explicit about where you want your packages to come from.

https://docs.astral.sh/uv/guides/integration/pytorch/
https://docs.astral.sh/uv/configuration/indexes/

[jfaust]

@zanieb Got it, that's much nicer. I'm brand new to uv so was just naively trying to convert a requirements.txt. In the repro it works great, I'll need to check a more involved example.

Should I close this, or would you still expect the original to have worked?

[zanieb]

We should at least have a better error message for the original.

[charliermarsh]

I'm starting to think about this problem.

[joellidin]

Hello, I am also having a similar problem. When following the guide on how to use uv with pytorch, I get the following error when trying to upgrade my dependencies with uv sync -U:

error: Distribution `torch==2.5.1 @ registry+https://download.pytorch.org/whl/cpu` can't be installed because it doesn't have a source distribution or wheel for the current platform

I am pretty sure this worked before so I don't really know what have changed. I have also tried to set a marker specifically for linux but still get the issue.

[tool.uv.sources]
torch = [
  { index = "pytorch-cpu", marker = "platform_system == 'Linux'" },
]
torchvision = [
  { index = "pytorch-cpu", marker = "platform_system == 'Linux'" },
]

[[tool.uv.index]]
name = "pytorch-cpu"
url = "https://download.pytorch.org/whl/cpu"
explicit = true