Support for the new CPU architecture names in Dockerfile.template

As far as I can see, currently you only support %%BALENA_MACHINE_NAME%% and %%BALENA_ARCH%% replacements in Dockerfile.template (see here).

For the RaspberryPi 3 these are “raspberrypi3” and “armv7hf” respectively

Docker Hub seems to prefer the armXXvN notation (e.g. arm32v7); their reasoning can be found here:

Is there any plan to have an additional macro for this distinction?

My concrete example is haproxy:
I need “arm32v7/haproxy” and would prefer to write “%%BALENA_CPUARCH%%/haproxy” (or similar) in my Dockerfile.template. After all, that’s the idea of docker file templates.

Is there any plan to have an additional macro for this distinction?

We agree it’s a good idea and it is indeed something that had already found its way in our backlog of feature requests. To preserve backwards compatibility, the idea is to have a new variable such as %%DOCKER_CPUARCH%%. Unfortunately I cannot provide an estimate at the moment of when it will be implemented, but we bump feature requests up in priority whenever a customer asks for them. So thank you for bringing this up, it does make a difference!