update-git-version-and-manual-pages.yml

name: Synchronize with new Git version (if any)

on:
  workflow_dispatch:
    inputs:
      force-rebuild:
        description: Force re-building all manual pages (e.g. after a script change)
        type: boolean
        default: false
  schedule:
    # check daily for updates
    - cron: '37 17 * * *'

jobs:
  update-git-version-and-manual-pages:
    runs-on: ubuntu-latest
    permissions:
      contents: write # to push changes (if any)
      pages: write # to deploy to GitHub Pages
      id-token: write # to verify that the deployment source is legit
      issues: write # to open tickets upon broken links
    environment:
      name: github-pages
      url: ${{ steps.deploy.outputs.url }}
    steps:
      - uses: actions/checkout@v4
        with:
          sparse-checkout: |
            .github/actions
            script
      - name: ruby setup
        uses: ruby/setup-ruby@v1
        with:
          bundler-cache: true
      - name: update recorded Git version
        env:
          GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # this seems to be needed to let `bundle exec` see `vendor/bundle/`
          { bundle check || bundle install --frozen; } &&

          # update recorded Git version
          bundle exec ruby script/update-git-version.rb
      - name: commit changes (if any)
        id: commit
        run: |
          # Exit early if there are no changes
          git update-index --ignore-submodules --refresh &&
          git diff-files --quiet --ignore-submodules -- hugo.yml &&
          exit 0

          version="$(git diff hugo.yml | sed -n '/^+ *latest_version: /{s/.*: //;p;q}')"
          echo "result=$version" >>$GITHUB_OUTPUT

          git \
            -c user.name=${{ github.actor }} \
            -c user.email=${{ github.actor }}@noreply.github.com \
            commit -m "Update git-version ($version)" \
              -m 'Updated via the `update-git-version-and-manual-pages.yml` GitHub workflow.' \
              -- hugo.yml
      - name: prepare worktree
        if: steps.commit.outputs.result != '' || inputs.force-rebuild == true
        run: git sparse-checkout disable
      - name: clone git.git
        if: steps.commit.outputs.result != '' || inputs.force-rebuild == true
        run: git clone --bare https://github.com/git/git '${{ runner.temp }}/git'
      - name: update manual pages
        if: steps.commit.outputs.result != '' || inputs.force-rebuild == true
        run: |
          if test true = '${{ inputs.force-rebuild }}'
          then
            export RERUN=true
          fi
          bundle exec ruby script/update-docs.rb '${{ runner.temp }}/git' en
      - name: commit manual pages
        id: manual-pages
        if: steps.commit.outputs.result != '' || inputs.force-rebuild == true
        run: |
          git add -A external/docs &&
          if test true = '${{ inputs.force-rebuild }}' && git diff-index --cached --quiet HEAD --
          then
            echo '::notice::A manual pages rebuild was requested but resulted in no changes' >&2
            exit 0
          fi &&
          version='${{ steps.commit.outputs.result }}' &&
          git \
            -c user.name=${{ github.actor }} \
            -c user.email=${{ github.actor }}@noreply.github.com \
            commit -m "Update manual pages (${version:-manually forced rebuild})" \
              -m 'Updated via the `update-git-version-and-manual-pages.yml` GitHub workflow.' &&
          echo "result=modified" >>$GITHUB_OUTPUT
      - name: verify that there are no uncommitted changes
        run: |
          git update-index --refresh &&
          if test -n "$(git diff HEAD)$(git ls-files --exclude-standard --other)"
          then
            echo '::error::there are uncommitted changes!' >&2
            git status >&2
            exit 1
          fi
      - name: deploy to GitHub Pages
        if: steps.commit.outputs.result != '' || steps.manual-pages.outputs.result != ''
        id: deploy
        uses: ./.github/actions/deploy-to-github-pages