keepalive.yml

name: Keep scheduled workflows alive

on:
  schedule:
    - cron: "23 19 3,17 * *" # 7:23pm on every 3rd and 17th of the month
  workflow_dispatch:

env:
  GIT_CONFIG_PARAMETERS: "'user.name=CI' 'user.email=ci@github'"

jobs:
  job:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v6
        with:
          persist-credentials: 'true'
      - name: Merge the upstream default branch
        id: merge
        if: github.event.repository.fork == true
        run: |
          git fetch --unshallow origin &&
          git fetch https://github.com/gitgitgadget/gitgitgadget-workflows HEAD &&
          if test 0 = $(git rev-list --count HEAD..FETCH_HEAD)
          then
            exit 0 # let the next step create a commit
          fi &&
          git merge --no-edit FETCH_HEAD &&
          echo "result=merged" >>$GITHUB_OUTPUT
      - name: Create a commit
        id: commit
        if: steps.merge.outputs.result != 'merged'
        run: |
          if test workflow_dispatch != '${{ github.event_name }}' &&
            test 0 -lt $(git rev-list --count --since=3.weeks.ago HEAD)
          then
            echo "::notice::No need to keep alive, there were commits in the last three weeks"
            echo "result=skip-push" >>$GITHUB_OUTPUT
            exit 0
          fi &&
          mkdir -p .github/cached
          file='.github/cached/keepalive.txt'
          date >$file
          git add "$file"
          git commit -m "workflow keepalive"
      - name: Push changes
        if: steps.commit.outputs.result != 'skip-push'
        run: |
          git push origin HEAD </dev/null || {
            for i in 1 2 3 4 5
            do
              # In case of concurrent pushes, let's pull and push
              git pull origin $GITHUB_REF </dev/null || exit 1
              git push origin HEAD </dev/null && exit 0
            done
            exit 1
          }