let run
    ~reference_build
    ?(bootstrap_samples=100)
    ~(run_with:Machine.t)
    ~processors 
    ~fastq 
    ~result_prefix 
    =
  let open KEDSL in
  let name = sprintf "kallisto-%s-bootstrap_%d" (Filename.basename result_prefix) bootstrap_samples in
  let result_file suffix = result_prefix ^ suffix in
  let output_dir = result_file "-kallisto" in
  let abundance_file = output_dir // "abundance.tsv" in
  let kallisto_index = index ~reference_build ~run_with in
  let kallisto_tool = Machine.get_tool run_with Machine.Tool.Default.kallisto in
  let r1_path, r2_path_opt = fastq#product#paths in
  let kallisto_quant_base_cmd = 
      sprintf 
        "kallisto quant -i %s -o %s -b %d -t %d %s"
          kallisto_index#product#path
          output_dir
          bootstrap_samples
          processors
          r1_path
  in
  let kallisto_quant = 
    match r2_path_opt with
    | Some r2_path -> sprintf "%s %s" kallisto_quant_base_cmd r2_path
    | None -> kallisto_quant_base_cmd
  in
  let make =
    Machine.run_big_program run_with ~name ~processors
      ~self_ids:["kallisto"; "quant"]
      Program.(
        Machine.Tool.init kallisto_tool
        && sh kallisto_quant
      )
  in
  workflow_node ~name ~make
    (single_file abundance_file ~host:(Machine.as_host run_with))
    ~edges:[
      on_failure_activate
        (Workflow_utilities.Remove.directory ~run_with output_dir);
      depends_on kallisto_index;
      depends_on (Machine.Tool.ensure kallisto_tool);
    ]