variables:
  GITLAB_CI_IMAGE_ALPINE: 'alpine:3.16.1'
  GITLAB_CI_SIGN_OFF_EXCLUDE: '40de4742d5277525f4b0e387121bd3c2c0ad323f'
stages:
  - static

# 'static' stage
sign_off:
  stage: static
  needs: []
  image: ${GITLAB_CI_IMAGE_ALPINE}
  before_script:
    - apk add --no-cache git
  script: >-
    git log
    --grep "^Signed-off-by: .\+<.\+\(@\| at \).\+\(\.\| dot \).\+>$"
    --invert-grep
    --format="Detected commit '%h' with missing or bad sign-off! Please read 'CONTRIBUTING.md'."
    --exit-code
    "$(rev=$(git rev-parse -q --verify "$GITLAB_CI_SIGN_OFF_EXCLUDE^{commit}") && echo "$rev..")"