update-cpp-sdk-on-release.yml

# Whenever a new Firebase Android SDK is released, this workflow triggers
# *another* workflow on the Firebase C++ SDK, which will check for the Android
# version update and create a PR updating its dependencies if any version
# numbers changed.
name: update-cpp-sdk-on-release
on:
  push:
    branches:
      # Change the below line if the main branch is renamed.
      - 'main'
    paths:
      # Only run this if a gradle.properties file is touched.
      - '**/gradle.properties'

jobs:
  check_if_version_changed:
    name: Check if released version changed
    # This step checks several things, and sets released_version_changed=1 only if all are true:
    # - The push must target the main branch.
    # - The push must modify a gradle.properties file.
    # - The push must change a "latestReleasedVersion=" line in a gradle.properties file.
    runs-on: ubuntu-latest
    outputs:
      released_version_changed: ${{ steps.check_version.outputs.released_version_changed }}
    steps:
      - uses: actions/checkout@v4.1.1
        with:
          # Check out the actual head commit, not any merge commit.
          ref: ${{ github.sha }}
          # Specify fetch-depth so we can query the log, the default is a shallow clone.
          fetch-depth: 0
      - name: Check if version was updated in git history
        id: check_version
        run: |
          # Query the git history for all gradle.properties files changed by this push.
          # Then, check the diff to see if any "latestReleasedVersion=" lines changed.
          if (git diff '${{ github.event.before }}' -- '**/gradle.properties' | grep -q '^[-+]latestReleasedVersion='); then
            echo "released_version_changed=1" >> $GITHUB_OUTPUT
          else
            echo "No change to latestReleasedVersion detected since ${{ github.event.before }}"
          fi

  trigger_cpp_sdk_update:
    name: Trigger C++ SDK update
    # If the previous step set the released_version_changed output param to 1, then
    # we should trigger the C++ SDK to update its Android dependencies.
    needs: check_if_version_changed
    if: ${{ needs.check_if_version_changed.outputs.released_version_changed }}
    # Fetch an authentication token for firebase-workflow-trigger, then use that
    # token to trigger the update-dependencies workflow in firebase-cpp-sdk.
    runs-on: ubuntu-latest
    steps:
      - name: Setup python
        uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3
        with:
          python-version: 3.7

      - name: Check out firebase-cpp-sdk
        uses: actions/checkout@v4.1.1
        with:
          repository: firebase/firebase-cpp-sdk
          ref: main

      - name: Get firebase-workflow-trigger token
        uses: tibdex/github-app-token@021a2405c7f990db57f5eae5397423dcc554159c
        id: generate-token
        with:
          app_id: ${{ secrets.CPP_WORKFLOW_TRIGGER_APP_ID }}
          private_key: ${{ secrets.CPP_WORKFLOW_TRIGGER_APP_PRIVATE_KEY }}
          repository: firebase/firebase-cpp-sdk

      - name: Trigger firebase-cpp-sdk update
        run: |
          pip install -r scripts/gha/python_requirements.txt
          python scripts/gha/trigger_workflow.py -t ${{ steps.generate-token.outputs.token }} -w update-dependencies.yml -p updateAndroid 1 -p updateiOS 0 -p comment "[Triggered]($GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID) by [firebase-android-sdk $(date '+%b %d') release]($GITHUB_SERVER_URL/$GITHUB_REPOSITORY/commit/${{ github.sha }})." -s 10 -A