'mbs-build local' is useful to test out changes locally without having to clog up koji - and if you don't have permissions to create modules or build them in koji. But sometimes you might want to try changing one module and then building another module against it - there's no way to do that currently since MBS uses the PDC as the only source of information about builds.

What I'd imagine is something pretty simple like:

mbs-build local --add-local-build=<modulename>-f26-20170530195158

This would then look ~/modulebuild/builds/ for that build, and then use the information in results/ as the "most recent" version of <modulebuild>, overriding anything from the PDC.

it would also be possible to automatically use results from ~/modulebuild/builds, but it's likely that you don't always want to do that.