version: '3.7'
run: when_changed

tasks:
  generate-hash:
    - rm -f hash.txt
    - task: input-content
      vars: { CONTENT: '1' }
    - task: input-content
      vars: { CONTENT: '2' }
    - task: input-content
      vars: { CONTENT: '2' }

  input-content:
    deps:
      - task: create-output
        vars: { CONTENT: '1' }
    cmds:
      - echo {{.CONTENT}} >> hash.txt

  create-output:
    run: once
    cmds:
      - echo starting {{.CONTENT}} >> hash.txt