extra-build-dependencies don't respect [tool.uv.sources] index pinning #18059
Description
Question
The documentation only mentions extra-build-dependencies and extra-build-variables. However, when I attempted to use them with uv pip, the installation failed with the following error:
uv pip install ".[cu128]"
uv pip install ".[flash-attn]"Because there is no version of torch==2.10.0+cu128 and you require torch==2.10.0+cu128, we can conclude that your requirements are unsatisfiable.
When I uncomment the no-build-isolation-package, it works well
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"
[project]
name = "Package"
version = "0.0"
requires-python = ">=3.10,<3.14"
dependencies = [
"pre-commit",
"pip",
"ninja",
"cmake",
"cython",
"setuptools",
"wheel",
"build",
]
[project.optional-dependencies]
flash-attn = [
"flash-attn; sys_platform != 'darwin'",
"psutil",
"packaging",
]
cu126 = [
"torch>2.6",
"torchcodec",
]
cu128 = [
"torch>2.6",
"torchcodec",
]
[tool.hatch.build.targets.wheel]
bypass-selection = true
[tool.uv]
upgrade = true
# no-build-isolation-package = ["flash-attn"]
conflicts = [
[
{ extra = "cu126" },
{ extra = "cu128" },
],
]
[tool.uv.extra-build-dependencies]
flash-attn = [{ requirement = "torch", match-runtime = true }]
[tool.uv.extra-build-variables]
flash-attn = { FLASH_ATTENTION_SKIP_CUDA_BUILD = "TRUE" }
[tool.uv.sources]
torch = [
{ index = "pytorch-cu126", extra = "cu126" },
{ index = "pytorch-cu128", extra = "cu128" },
]
flash-attn = [
{ index = "XXXXRT" },
]
torchao = [
{ index = "pytorch-cpu" },
]
torchcodec = [
{ index = "pytorch-cu126", extra = "cu126" },
{ index = "pytorch-cu128", extra = "cu128" },
]
[[tool.uv.index]]
name = "pytorch-cu126"
url = "https://download.pytorch.org/whl/cu126"
explicit = true
[[tool.uv.index]]
name = "pytorch-cu128"
url = "https://download.pytorch.org/whl/cu128"
explicit = true
[[tool.uv.index]]
name = "XXXXRT"
url = "https://xxxxrt666.github.io/PIP-Index"
explicit = truePlatform
Ubuntu 22.04 AArch64
Version
uv 0.10.2