roles/pycobertura-diff/tasks/main.yaml

- name: Place for new version of sources
  file:
    path: "{{ new_source_prefix }}"
    state: directory

- name: Prepare copy of the new version of sources
  command: git worktree add {{ new_source_prefix }}/{{ zuul.project.short_name }} {{ zuul.branch }}
  args:
    chdir: "{{ zuul.project.src_dir }}"

- name: Retrieve coverage from parent jobs
  get_url:
    url: "{{ item.url }}"
    dest: "{{ new_source_prefix }}/coverage.xml"
  when:
    - item.metadata is defined
    - item.metadata.type is defined
    - item.metadata.type == "cobertura_xml"
  loop: "{{ zuul.artifacts }}"

- name: Generate pycobertura report
  shell: |
    set -ex
    PATH=${PATH}:~/.local/bin
    pycobertura show --format html --output "{{ ansible_user_dir }}/zuul-output/logs/coverage.html" \
      --source "{{ new_source_prefix }}/{{ zuul.project.short_name }}" "{{ new_source_prefix }}/coverage.xml"
    pycobertura diff --format html --output "{{ ansible_user_dir }}/zuul-output/logs/coverage-diff.html" \
      --source1 "{{ zuul.project.src_dir }}" "{{ coverage_xml_dir }}/coverage.xml" \
      --source2 "{{ new_source_prefix }}/{{ zuul.project.short_name }}" "{{ new_source_prefix }}/coverage.xml"
    sed -e 's;^  </body>$;    <p>Show <a href="coverage.html">final coverage</a> only</p>\n  </body>;' \
      -i "{{ ansible_user_dir }}/zuul-output/logs/coverage-diff.html"