auto-merge-dependabot.yaml

# Auto-merge Dependabot PRs that upgrade patch or minor versions if CI passes
# Copied from https://docs.github.com/en/code-security/dependabot/working-with-dependabot/automating-dependabot-with-github-actions#enable-auto-merge-on-a-pull-request
# Also see https://github.com/dependabot/fetch-metadata

name: Dependabot auto-merge
on:
  pull_request:
    branches: main
  workflow_dispatch:

permissions:
  pull-requests: write
  contents: write

jobs:
  dependabot:
    runs-on: ubuntu-latest
    if: github.actor == 'dependabot[bot]'
    env:
      PR_URL: ${{github.event.pull_request.html_url}}
      GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
    steps:
      - name: Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v2.2.0
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"

      - name: Enable auto-merge for Dependabot PRs
        if: >
          ! contains(steps.metadata.outputs.dependency-names, 'tlslite-ng') &&
          (steps.metadata.outputs.update-type != 'version-update:semver-major' ||
           contains(steps.metadata.outputs.dependency-names, 'certifi'))
        # certifi uses calver, not semver
        run: gh pr merge --auto --rebase "$PR_URL"

      - name: "Warn that we won't auto-merge major version updates"
        if: >
          ! contains(steps.metadata.outputs.dependency-names, 'certifi') &&
          steps.metadata.outputs.update-type == 'version-update:semver-major'
        run: gh pr comment "$PR_URL" -b "Looks like a major version upgrade! Skipping auto-merge."