These build defs contain a set of rules for building Docker images with plz. Unfortunately this is quite tricky since docker commands operate via side effects whereas plz is a file-based build system. This is worked around by the actual docker build being done by plz run on the relevant target.

Within the Dockerfile you have access to those files declared as srcs of it (and only those ones, not anything else in the same directory).

It's also possible to derive Docker images from one another; you can set the FROM clause to a build label and set the base_image argument on the build rule to match. They'll be built in sequence.

Images are fingerprinted and tagged using a unique hash based on their inputs, so they're always identifiable.