We're in the process of switching our docker registries from one cloud provider to another. For testing purposes it would be convenient to pass the registry name to

publish

as a command line argument. Is that a thing that is possible?

pants publish --docker-registries=

was my best guess but I'm not having much luck plumbing though the dictionary it wants.

Can you give an example of what you're trying and the errors? I'd expect something like

--docker-registries='{"name": {"address": "foo"}}'

to work... but maybe the nested dictionaries don't bring happiness to anyone. If we can't get that to work, some alternatives might be: • setting via

DOCKER_REGISTRIES=...

env var • setting via an extra

.toml

file, e.g.

PANTS_CONFIG_FILES=/path/to/pants.special-docker.toml

that just contains

[docker.registries.$name] ...

entries • having all registries in

pants.toml

file at all times, but making it dynamic in

BUILD

, e.g. a

__defaults__(docker_image=dict(registries=[env("CUSTOM_REGISTRY", "original-provider"))

(https://www.pantsbuild.org/stable/docs/using-pants/key-concepts/targets-and-build-files#field-default-values) where something sets

CUSTOM_REGISTRY=new-provider

env var (or some other way of conditionalising it)

Ahh! I was missing the nesting in the registries dict. That does appear to be working 🎉