update-branches.yml

name: Update Branches

# we only want to run this job manually via button pushing
on:
  workflow_dispatch:

defaults:
  run:
    shell: 'bash -Eeuo pipefail -x {0}'
env:
  TZ: UTC

concurrency:
  group: update-branches
  cancel-in-progress: true

jobs:

  generate:
    name: Generate Matrix
    runs-on: ubuntu-latest
    outputs:
      arches: ${{ steps.generate.outputs.arches }}
    steps:
      - uses: actions/checkout@v2
      - id: generate
        name: Generate
        run: |
          arches="$(jq -Rsc 'rtrimstr("\n") | split("\n") | unique' */arches)"
          echo "::set-output name=arches::$arches"

  arch:
    needs: generate
    strategy:
      matrix:
        arch: ${{ fromJSON(needs.generate.outputs.arches) }}
    name: Update ${{ matrix.arch }}
    runs-on: ubuntu-latest
    env:
      dpkgArch: ${{ matrix.arch }}
    steps:
      - uses: actions/checkout@v2

      - name: Prep
        id: prep
        run: |
          case "$dpkgArch" in
            amd64 | i386 | riscv64 | s390x) bashbrewArch="$dpkgArch" ;;
            armhf) bashbrewArch='arm32v7' ;;
            arm64) bashbrewArch='arm64v8' ;;
            ppc64el) bashbrewArch='ppc64le' ;;
            *) echo >&2 "error: unexpected / unsupported architecture: '$dpkgArch'"; exit 1 ;;
          esac
          echo "::set-output name=bashbrewArch::$bashbrewArch"
          echo "bashbrewArch=$bashbrewArch" >> "$GITHUB_ENV"

          git config user.name 'Docker Library Bot'
          git config user.email 'github+dockerlibrarybot@infosiftr.com'

      - name: Download Artifacts
        run: |
          echo "$dpkgArch" > arch
          ./update.sh

      - name: Commit
        run: |
          git add arch
          for dir in */; do
            dir="${dir%/}"
            if [ ! -f "$dir/Dockerfile" ]; then
              rm -rf "$dir"
            fi
            git add -A "$dir"
          done

          latestSerial="$(
            gawk -F '=' '$1 == "SERIAL" { print $2 }' */build-info.txt \
              | sort -un \
              | tail -1
          )"

          latestDate="${latestSerial%%[^0-9]*}"
          rfc2822="$(date --date "$latestDate" --rfc-2822)"
          export GIT_AUTHOR_DATE="$rfc2822"
          export GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"

          git commit --message "Update to $latestSerial for $bashbrewArch ($dpkgArch)"

      - name: Push
        uses: ad-m/github-push-action@v0.6.0
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          branch: dist-${{ steps.prep.outputs.bashbrewArch }}
          force: true