let picard =
  let url =
    "https://github.com/broadinstitute/picard/releases/download/1.127/picard-tools-1.127.zip"
  in
  let jar = "picard-tools-1.127" // "picard.jar" in
  let init_program ~path = KEDSL.Program.(shf "export PICARD_JAR=%s/%s" path jar) in
  installable_tool Machine.Tool.Default.picard ~url ~init_program
    ~witness:(witness_file jar)