Allow build plugins in the new plugin system

DockerCon was great this year and one talk I really enjoyed was the “The Dockerfile Explosion and the Need for Higher Level Tools”. It really got me thinking about the need to be able to extend Docker to be able to build the images in the way that we want.

Anyways, with docker 1.12, there is now a more concrete concept of a plugin to be able to redefine some behavior of the Docker CLI. I was wondering if there were plans of extending the plugins to not only networks and storage but to allow us to extend how builds work. This especially important considering that there is a weird freeze of getting new features into Dockerfile (barring the new HEALTHCHECK directive).

What kind of high level functionality exactly do you need ?