Arbitrary environment property for environment markers

[orctom]

Say I have an app that have to be runnable on these boxes:

• Ubuntu, with CUDA 11.4 (which requires the cu111 version)
• Ubuntu, with CUDA 10.2 (cu111 doesn't work)
• Ubuntu, CPU only
• MacOS

If only for Linux and MacOS, we can use environment markers such as:

torch = [
  {version = "1.8.1", markers = "sys_platform == 'linux'"},
  {version = "1.8.1", markers = "sys_platform == 'darwin'"}
]

But there're no options for different CUDA versions.

Can we add an environment property specific markers such as markers_env.

PROPOSAL:
Manually set a env property on box, export any_name=any_value
In dependency section: markers_env = "any_name <= the_condition_value"

e.g.

# set env property on box manually
export cuda=10.2

[tool.poetry.dependencies]
#...
torch = [
  {version = "1.8.1", markers = "sys_platform == 'linux'", markers_env = "cuda < 11.1"},
  #{url = "https://download.pytorch.org/whl/cu111/torch-1.8.1%2Bcu111-cp38-cp38-linux_x86_64.whl", markers = "sys_platform == 'linux'", markers_env = "cuda >= 11.1"},
  {version = "1.8.1+cu111", source="pytorch", markers = "sys_platform == 'linux'", markers_env = "cuda >= 11.1"},
  {version = "1.8.1", markers = "sys_platform == 'darwin'"}
]

#...

[[tool.poetry.source]]
name = "pytorch"
url = "https://eternalphane.github.io/pytorch-pypi/"
secondary = true
#...

[finswimmer]

Hello @orctom,

while I understand your use case, this is nothing Poetry can or will solve by it's own. Each dependency definition must be transferable to a PEP-508 compliant string. The environment-markers section has a clear idea what is allowed here.

You could try starting a broader discussion at https://discuss.python.org or have a look there if there is already some discussion going on. Once there is excepted PEP we are glad to implement it into Poetry :)

fin swimmer

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