Getting the "provided" dependencies in SBT

Question

I'm trying to make use of the provided configuration in SBT, but I'm having trouble figuring out how to get the full provided dependency classpath.

For simplicity, let's say I have two projects, A and B :

• A has a few (JAR) dependencies, and exports compiled class files to path/to/A/target
• B depends on A in the provided scope ( Project("B") dependsOn(A % "provided")) and exports compiled class files to path/to/B/target

In B, this returns the provided JARs, but not the provided internal dependencies :

providedDependencies <<= (update) map (_.select(Set("provided")))

This returns the internal dependencies (path/to/A/target) for every configuration, but not specifically for the provided scope, and does not output the JAR dependencies :

providedDependencies <<= (internalDependencyClasspath) map (_.files)

However, the A module shows up in the provided scope when using show update in the B project.

Any idea?

Answer 1

I ended up using this task after reading this answer, but it was surprisingly hard to find :

def providedInternalDependenciesTask(proj: ProjectRef, struct: Load.BuildStructure) = {
    // "Provided" dependencies of a single ResolvedProject
    def providedDeps(op: ResolvedProject): Seq[ProjectRef] = {
      op.dependencies
        .filter(p => (p.configuration getOrElse "") == "provided")
        .map(_.project)
    }

    // Collect every "provided" dependency in the dependency graph
    def collectDeps(projRef: ProjectRef): Seq[ProjectRef] = {
      val deps = Project.getProject(projRef, struct).toSeq.flatMap(providedDeps)
      deps.flatMap(ref => ref +: collectDeps(ref)).distinct
    }

    // Return the list of "provided" internal dependencies for the ProjectRef
    // in argument.
    collectDeps(proj)
      .flatMap(exportedProducts in (_, Compile) get struct.data)
      .join.map(_.flatten.files)
  }

Usage example :

val providedInternalDependencies = TaskKey[Seq[java.io.File]]
...
providedInternalDependencies <<= (thisProjectRef, buildStructure) flatMap providedInternalDependenciesTask

Answer 2

I tried the solution that F.X. provided but it kept showing me an empty dependencies list (both for provided and otherwise).

I found that you can ask the "update" task to give you the full view and then you can filter based on configuration (such as "provided").

val providedDependencies = TaskKey[Seq[java.io.File]]("task-provided-deps","The list of dependencies in the 'provided' scope")
...
providedDependencies <<= (update) map {
    up.select(configurationFilter("provided"))
},

I used this list to exclude the provided deps from getting jarred up into my "all in one" sonar plugin.