sbt auto-plugins - disable them but for one sub project

Question

Switching sbt-assembly from 0.11.2 to 0.13.0, I suddenly find myself in a situation where calling sbt assembly does not just invoke the task in the sub-project that explicitly added assemblySettings, but it tries to run it for each and every sub project.

So, if I have

lazy val root = project(...).aggregate(core, app)

lazy val core = project(...)

lazy val app  = project(...).dependsOn(core)

How can I disable the assembly task for all but the root project? With other plugins such as sbt-buildinfo this problem doesn't occur because you have to explicitly enable the plugin per sub-project.

The goal is to be able to run sbt assembly so it will do that just for the root project.

Answer 1

Found the answer in a closed issue. You have to add the following line to your common settings:

aggregate in assembly := false