python_requirements environment constraints

[bvolkmer]

If I have or example, a requirements.txt with the following content:

pywin32==308 ; platform_system == 'Windows'

It will try to install the package and fail because it is not available on Linux.
But normally, pip (at least 24.3.1) does succeed with

Ignoring pywin32: markers 'platform_system == "Windows"' don't match your environment

So I suspect that the requirement.txt file is modified in the process.

[meatballhat]

@bvolkmer You are absolutely right. Although the original requirements.txt is not modified, there is a decent amount of fiddling going on. If it's an option, I'd recommend using a separate file specifically for the Cog environment such as python_requirement: requirements-cog.txt which excludes the non-Linux dependencies.

[danfairs]

I bumped into this issue and believe I have a fix for it. The PR is in #2302. Feedback and testing welcome!