roles/git-clang-format/tasks/main.yaml

- name: Run test_command
  shell: |
    OUT='{{ ansible_user_dir }}/zuul-output/logs/git-clang-format.patch'
    git-clang-format --quiet --diff --style file 'origin/{{ zuul.branch }}' | tee "${OUT}"
    if [[ "$(head -n 1 ${OUT})" == "no modified files to format" ]]; then
      # no usable exit code for this...
      rm -f "${OUT}"
      exit 0
    elif [[ -s "${OUT}" ]]; then
      # ...whereas this one exits with 0...
      exit 1
    else
      rm -f "${OUT}"
      exit 0
    fi
  args:
    chdir: '{{ zuul.project.src_dir }}'