Arbitrary skip logic?

[ktbarrett]

I've been working on a project recently (pyuvm) that uses tox for testing. One of it's dependencies is cocotb. cocotb < 2.0 did not test or explicitly support ARM Macs and there are compilation issues on those platforms with those older versions of cocotb. I would like to expand the notion of skipping unsupported platforms that tox does to include the architecture in the logic. But seeing as tox only tests sys.platform I'm not sure how to accomplish that. I also did not see a way to specify arbitrary skip logic, but I could be blind.

Is there a feature in tox to write arbitrary skip logic for a particular env? Or will I have to do this logic in the env's command to force an early pass in lieu of "skip"?

This same problem could be expanded to particular versions of an OS, such as supported in Mac 13 and 14, but not 15 and 26, etc.

[gaborbernat]

I don't think we have anything built in but you probably can write an inline plugin to achieve that.

[ktbarrett]

Adding the ability to customize skip logic seems niche, but valuable, and could be done transparently. Would adding a feature to tox for this be accepted?

I'd think it would be via a new configuration option skipif and would default to sys.platform not in testenv.name or f"py{sys.version_info[0]}{sys.version_info[1]}" not in testenv.name or something along those lines to preserve backwards compatibility.

[gaborbernat]

I think it is niche enough that I don't think it's worth adding it to the core you should instead achieve it via the plugin system.

[ktbarrett]

Which hook would allow this? I don't see anything in the API mentioning skipping.

[gaborbernat]

https://github.com/tox-dev/tox/blob/main/src/tox/tox_env/errors.py#L11, we don't have detailed docs on this.