.github/workflows/recreate-site-branch.yml

# Recreates the orphan site branch
#
# This workflow is set up as a fallback in cases where the site branch has been deleted
# The workflow to automatically publish the site after a push to the master relies on there already being a functioning site branch
# This will not cause the website to be published; another push to the site branch (e.g. thought the deploy workflow) is necessary for this
name: Recreate Site Branch - ONLY USE IF SITE BRANCH GOT DELETED

# Conditions necessary to trigger a build
#
# Can only be triggered manually
on:
  workflow_dispatch:


jobs:
  build:
    name: Build & Deploy Site
    runs-on: ubuntu-latest
    defaults:
      run:
        shell: bash

    env:
      # The name of the branch used to publish the website build artifacts
      BRANCH_NAME: publish

    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          ref: master
          fetch-depth: 1


      - name: Build Site
        run: |
          mvn clean package


      # Determines the short sha of the commit that triggered the build
      - name: Determine Short SHA
        if: success()
        id: short-sha
        run: |
          short_sha=$(git rev-parse --short=10 $GITHUB_SHA)
          echo "::set-output name=SHORT_SHA::$short_sha"


      # Determines the author data of the HEAD commit
      # Sets up the author data to be used for the site deploy commit
      - name: Determine HEAD Commit Author Data
        if: success()
        id: author-data
        run: |
          echo "Reading author data"
          author_name=$(git log -1 --format='%aN' HEAD)
          author_email=$(git log -1 --format='%aE' HEAD)

          echo "Setting up author data to use for deploy commit"
          git config user.name $author_name
          git config user.email $author_email


      # Creates and checks out a new orphan branch used to publish the site
      - name: Create Orphan Site Branch
        if: success()
        run: |
          git checkout --orphan ${{ env.BRANCH_NAME }}


      # Drops all content other than the site data from the workspace
      # This creates a minimal state that only contains the website build results
      - name: Drop Content Other Than Site Data
        if: success()
        run: |
          git reset
          rm .gitignore
          git add target/site
          git add .asf.yaml.publish .htaccess
          git clean -df


      # Moves the site content and site configuration to the correct location
      - name: Move Content and Site Configuration
        if: success()
        run: |
          mkdir -v content
          git mv -v target/site/* content/
          git mv -v .asf.yaml.publish .asf.yaml


      # Creates a single commit containing only the site build artifacts and site configuration files
      # The commit is created with the author data set up in the previous step
      # Force-pushes the created branch, overwriting the previously published site build
      - name: Publish Results
        if: success()
        run: |
          git commit -m "Auto-deploy site for commit ${{ steps.short-sha.outputs.SHORT_SHA }}"
          git push -f origin ${{ env.BRANCH_NAME }}