check_versions.yml

---

name: Check container software versions

on:
  workflow_dispatch:
  # Check for new versions in adsbx repos
  schedule:
    - cron: "0 12 * * *"

env:
  GHCR_IMAGE: ${{ github.repository }}:latest
  GHCR_REGISTRY: ghcr.io
  WORKFLOW_FILE_TO_TRIGGER: deploy.yml
  WORKFLOW_AUTH_TOKEN: ${{ secrets.GH_PAT_MIKENYE }}

jobs:

  version_in_container:
    name: Check versions in 'latest' image
    runs-on: ubuntu-latest
    outputs:
      currverhash: ${{ steps.current-version.outputs.currverhash }}
    steps:
      - name: Get versions from ${{ env.GHCR_IMAGE }}
        id: current-version
        run: |
          set -x
          docker run --rm --entrypoint cat ${{ env.GHCR_REGISTRY }}/${{ env.GHCR_IMAGE }} /VERSIONS
          echo "::set-output name=currverhash::$(docker run --rm --entrypoint md5sum ${{ env.GHCR_REGISTRY }}/${{ env.GHCR_IMAGE }} /VERSIONS)"

  latest_version:
    name: Check latest versions
    runs-on: ubuntu-latest
    outputs:
      latestverhash: ${{ steps.latest-version.outputs.latestverhash }}
    steps:
      - name: Build image
        uses: docker/build-push-action@v4
        with:
          push: false
          load: true
          tags: local_image_for_versions:latest
      - name: Get versions from newly built image
        id: latest-version
        run: |
          set -x
          docker run --rm --entrypoint cat local_image_for_versions /VERSIONS
          echo "::set-output name=latestverhash::$(docker run --rm --entrypoint md5sum local_image_for_versions /VERSIONS)"

  display_versions:
    name: Display versions
    needs: [version_in_container, latest_version]
    runs-on: ubuntu-latest
    steps:
      - name: Display versions
        run: |
          echo "version hash in current latest image = ${{ needs.version_in_container.outputs.currverhash }}"
          echo "version hash in image just built = ${{ needs.latest_version.outputs.latestverhash }}"
          echo "will a deployment be triggered = ${{ needs.version_in_container.outputs.currverhash != needs.latest_version.outputs.latestverhash }}"

  trigger_deploy:
    name: Trigger deployment of image
    needs: [version_in_container, latest_version]
    if: ${{ needs.version_in_container.outputs.currverhash != needs.latest_version.outputs.latestverhash }}
    runs-on: ubuntu-latest
    env:
      WORKFLOW_REASON: "triggered via check_versions.yml in ${{ github.repository }}"
    steps:
      - name: Trigger ${{ env.WORKFLOW_FILE }} in ${{ env.WORKFLOW_REPO }}
        run: |
          echo "$WORKFLOW_AUTH_TOKEN" | gh auth login --with-token
          gh workflow run --ref main --repo "${{ github.repository }}" "${{ env.WORKFLOW_FILE_TO_TRIGGER }}" -f reason="$WORKFLOW_REASON"