Has anyone come up with a plugin or a decent way to handle

cache_to

and

cache_from

without having to specify them manually? I find lots of chats but nothing conclusive?

What's the problem you're running into?

Every time I am defining a new

docker_image

, I need to manually fill in these values, and I haven't found a way to parametrize them

docker_image(
    name="dev",
    source="Dockerfile.dev",
    cache_from=[
        {
            "type": "registry",
            "ref": "europe-docker.pkg.dev/xxxxx/infra/base-images/images/coder/dev:cache-{{build_args.DOCKER_TAG_BRANCH}}",
        },
        {
            "type": "registry",
            "ref": "europe-docker.pkg.dev/xxxxx/infra/base-images/images/coder/dev:main",
        },
    ],
    cache_to={
        "type": "registry",
        "ref": "europe-docker.pkg.dev/xxxxx/infra/base-images/images/coder/dev:cache-{{build_args.DOCKER_TAG_BRANCH}},mode=max",
    },
)

What about writing a macro?

I don't think you can get the right interpolation in the macro. do you have a working example?

In public, no - I worked with a client and we used a macro - but there may be some details that wouldn’t work in your scenario. We passed in whatever data we needed to that macro, and it was perfectly adequate for the job - but again, case by case

I have given it several shots 🙂 I was hoping there was someone with a working example

You can use build_file_dir in a macro

def my_image(name: str, ...):
    docker_image(
        name=name, 
        cache_to=f"repo/{build_file_dir()}/{name}"
        ...
    )

wow

# helpers/pants-plugins/macros/docker_image.py
original_docker_image = docker_image

def docker_image(**kwargs):
    cache_tag = "cache-{build_args.DOCKER_TAG_BRANCH}"
    name = kwargs["name"]
    repository = f"xxxxxxxx/{build_file_dir()}/{name}"
    cache_from=[
        {
            "type": "registry",
            "ref": repository + ":cache-{{build_args.DOCKER_TAG_BRANCH}}",
        },
        {
            "type": "registry",
            "ref": repository + ":main",
        },
    ]
    cache_to={
        "type": "registry",
        "ref": repository + ":cache-{{build_args.DOCKER_TAG_BRANCH}},mode=max",
    }
    
    kwargs.setdefault("cache_from", cache_from)
    kwargs.setdefault("cache_to", cache_to)

    original_docker_image(**kwargs)

and in

pants.toml

build_file_prelude_globs = [
  "helpers/pants-plugins/macros/docker_image.py"
]

Nice