Not sure how to even ask this question, but suppose I have a backend with an

experimental-deploy

goal. That goal runs a python file in a sandbox. How can a user of my backend pass command line arguments to the script? I did try just running

pants experimental-deploy src/mything -- --foo=bar --baz=quux

but those flags don't make it through to sys.argv in the process, which makes sense. My deploy rule is just constructing a Process and wrapping it up as a DeployProcess, but I'm unclear about how I would obtain additional, arbitrary, command line arguments for that Process. Is this a thing?

This seems to be what you're after? Note

passthrough=True

https://github.com/pantsbuild/pants/blob/efab3e40cedce5c31dcab729fe3ffb8b4314be3e/src/python/pants/backend/helm/subsystems/helm.py#L178

Tis indeed, it's just that thing where you don't know what to even ask 😄 Once you know it's a subsystem that you need, it's all groovy.