[gradle-user] extracting tar contents via dependencies

[Brett Cave]

I am trying to extract a tar.bz2 archive that is added to a repository from
an upstream build. I came across this thread:
http://gradle.1045684.n5.nabble.com/built-in-unzip-support-for-zip-and-tar-gz-td1431871.html

This is what I have:

configurations {
  upstreamArchive
}

depedencies {
  upstreamArchive "my.group:artifactId:$upstreamvers...@tar.bz"
}

task extractFiles << {
  theArchives = configurations.upstreamArchive.resolve()
  theArchives.each {
     copy {
        from tarTree(it)
        into buildDir
  }
}

It runs without error, but no files are extracted into buildDir