name: DCO checker

on:
  pull_request:
    branches: [master]
    types: [opened, synchronize, reopened]

jobs:
  check:
    name: DCO checker
    runs-on: debian
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: DCO checker
        run: |
          commits=$(git rev-list origin/master..HEAD)
          for commit in $commits; do
              commit_subject=$(git show --quiet --format=%s $commit)
              commit_sha=$(echo $commit | cut -c1-10)
              echo "Checking commit $commit_sha \"$commit_subject\""
              if ! git show --quiet --format=%B $commit | grep -q "Signed-off-by:"; then
                  author=$(git show --quiet --format=%an $commit)
                  echo "Commit $commit by $author is missing the 'Signed-off-by:' line"
                  exit 1
              fi
          done
          echo "All commits have the 'Signed-off-by:' line."