dxapp.yml

dx-yml-build

#!/usr/bin/env python
#
# dx-yml-build: transcodes dxapp.yml to dxapp.json and then runs `dx build`
# with command-line arguments passed through.
#
# Requires PyYAML (apt-get install python-yaml OR pip install pyyaml)

import os, sys
import yaml, json

with open('dxapp.yml') as infile:
    data = yaml.load(infile)
    data["00COMMENT"] = "This dxapp.json has been generated from dxapp.yml automatically using dx-yml-build"
    with open('dxapp.json', 'w') as outfile:
        json.dump(data, outfile, sort_keys=True, indent=2)
        outfile.write('\n')

os.execvp("dx", ["dx", "build"] + sys.argv[1:])

dxapp.yml

name: hello-world
dxapi: 1.0.0
version: 0.0.1
inputSpec:
- name: infile
  class: file
  optional: true
outputSpec:
- name: outfile
  class: file
runSpec:
  systemRequirements:
    main:
      instanceType: mem1_ssd1_x2
  distribution: Ubuntu
  release: "14.04"
  execDepends:
    - name: liblz4-tool
  interpreter: bash
  code: |
    #!/bin/bash
    
    main() {
      set -ex -o pipefail

      # dx-download-all-inputs --parallel
      if [ -n "$infile" ]; then
          dx cat "$infile" > /dev/null
      fi

      mkdir -p out/outfile
      echo "Hello, world!" > out/outfile/hello-world.txt

      # dx-upload-all-outputs --parallel
      outfile=$(cat out/outfile/hello-world.txt | dx upload --destination "hello-world.txt" --brief -)
      dx-jobutil-add-output outfile "$outfile" --class=file
    }