in project/Distributions.scala [81:87]
def makeTarGz(inputs: Traversable[(File, String)], output: File): Unit = {
val out = output.getAbsoluteFile
if (out.exists()) {
if (out.isFile) out.delete() else sys.error(s"Cannot write to file $out as it is not a file")
}
tarGz(inputs, out)
}