(Docker backend) Does

{pants.hash}

interpolated value work in

extra_build_args

? The code and docs suggest so, but dumping the sandbox I see

--build-arg $'INPUT_HASH={pants.hash}'

Please point to where this suggests to be working for

extra_build_args

.. as the docs, although subtle I grant you that, does not say it is supported. Note the difference for these two field docs:

extra_build_args

type:

Iterable[str] | None

default:

()

Build arguments (

--build-arg

) to use when building this image. Entries are either strings in the form

ARG_NAME=value

to set an explicit value; or just

ARG_NAME

to copy the value from Pants’s own environment.

Use

[docker].build_args

to set default build args for all images.

image_tags

type:

Iterable[str] | None

default:

('latest',)

Any tags to apply to the Docker image name (the version is usually applied as a tag).

tag may use placeholders in curly braces to be interpolated. The placeholders are derived from various sources, such as the Dockerfile instructions and build args.

See Tagging Docker images.

(only one of them mentions placeholders…)

https://www.pantsbuild.org/docs/tagging-docker-images#string-interpolation-using-placeholder-values

As we've seen above, some fields of the

docker_image

support replacing placeholder values in curly braces with variable text, such as a build arg or base image tag for instance.

Specifically "build arg" Followed by:

These are the common values available for all fields:

cool, that’s a doc-fart. 😛

OHHH I'm misreading. It's saying the value would be the build arg or tag, not that the build args or tags support interpolation

oh, yea

Well glad my fart found another fart

still, I don’t recall why this is not applied to all fields..