minecraft/.gitea/workflows/minecraft-build.yml

name: Build and Push Minecraft Docker Images on Debian-base update

on:
  push:
    branches:
      - master
    paths:
      - '.gitea/workflows/*.yml'
      - '**/Dockerfile'
      - '**/*.sh'
      - '!.cache/*'
      - '!**/CHANGES.md'
      - '!**/build-info.json'
  schedule:
    - cron: '30 21 * * 0'

env:
  IMAGE_REGISTRY: gitea.fithwum.tech
  IMAGE_ORG: fithwum
  IMAGE_REPO_DEBIAN: debian-base
  IMAGE_REPO_MINECRAFT: minecraft
  IMAGE_TAG_DEBIAN: bookworm
  DIGEST_FILE: .cache/debian-base.digest
  VERSIONS: testing vanilla fabric neoforged forge bukkit quilt

jobs:
  docker-prune:
    name: Docker prune (${{ matrix.runner }})
    runs-on: ${{ matrix.runner }}
    strategy:
      fail-fast: false
      matrix:
        runner:
          - vm-docker-build2
          - vm-docker-build2
    steps:
      - name: Prune unused Docker images
        run: |
          echo "[INFO] Pruning Docker images on ${{ matrix.runner }}..."
          docker image prune -a -f || true

  # poll-debian-base-and-detect-changes:
  #   runs-on: vm-docker-build2
  #   needs: docker-prune
  #   outputs:
  #     digest_changed: ${{ steps.compare_digest.outputs.changed }}
  #     versions_changed: ${{ steps.check_changed_versions.outputs.versions_changed }}
  #     new_versions: ${{ steps.check_new_versions.outputs.new_versions }}
  #   steps:
  #     - name: Checkout repo
  #       uses: actions/checkout@v3
  #       with:
  #         fetch-depth: 0

  #     - name: Ensure .cache exists
  #       run: mkdir -p .cache && touch .cache/.gitkeep

  #     - name: Log in to Gitea Registry
  #       run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login gitea.fithwum.tech -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin

  #     - name: Get current digest of debian-base image
  #       id: get_digest
  #       run: |
  #         IMAGE="${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_ORG }}/${{ env.IMAGE_REPO_DEBIAN }}:${{ env.IMAGE_TAG_DEBIAN }}"
  #         docker pull "$IMAGE" > /dev/null
  #         DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' "$IMAGE")
  #         echo "digest=$DIGEST" >> $GITHUB_OUTPUT
  #         echo "$DIGEST" > .cache/debian-base.digest.new

  #     - name: Compare with stored digest
  #       id: compare_digest
  #       run: |
  #         CURRENT_DIGEST="${{ steps.get_digest.outputs.digest }}"
  #         LAST_DIGEST="$(cat ${{ env.DIGEST_FILE }} 2>/dev/null || echo '')"

  #         if [ "$CURRENT_DIGEST" = "$LAST_DIGEST" ]; then
  #           echo "[INFO] Digest unchanged"
  #           echo "changed=false" >> $GITHUB_OUTPUT
  #           exit 0
  #         fi

  #         echo "[INFO] Digest changed → updating cache"
  #         echo "$CURRENT_DIGEST" > ${{ env.DIGEST_FILE }}

  #         git config user.name "${{ secrets.GIT_USERNAME }}"
  #         git config user.email "${{ secrets.GIT_EMAIL }}"

  #         git add ${{ env.DIGEST_FILE }}
  #         git commit -m "Update base digest to $CURRENT_DIGEST" || true

  #         # --- Safe rebase with auto conflict resolution ---
  #         git fetch origin master
  #         if ! git rebase --strategy-option=theirs origin/master; then
  #           echo "[WARN] Rebase conflict, auto-resolving by preferring local digest"
  #           git rebase --abort
  #           git fetch origin master
  #           git reset --hard origin/master
  #           echo "$CURRENT_DIGEST" > ${{ env.DIGEST_FILE }}
  #           git add ${{ env.DIGEST_FILE }}
  #           git commit -m "Force-update base digest to $CURRENT_DIGEST (auto-resolved)"
  #         fi

  #         git push origin HEAD:master
  #         echo "changed=true" >> $GITHUB_OUTPUT

  #     - name: Detect changed Minecraft versions
  #       id: check_changed_versions
  #       run: |
  #         BEFORE_COMMIT="${{ github.event.before }}"
  #         if [ -z "$BEFORE_COMMIT" ] || ! git cat-file -e "$BEFORE_COMMIT^{commit}" 2>/dev/null; then
  #           BEFORE_COMMIT=$(git rev-parse HEAD~1)
  #         fi
  #         CHANGED=$(git diff --name-only "$BEFORE_COMMIT" HEAD || true)
  #         CHANGED_VERSIONS=""
  #         for version in $VERSIONS; do
  #           echo "$CHANGED" | grep -q "^$version/.*\.\(sh\|Dockerfile\)$" && CHANGED_VERSIONS="$CHANGED_VERSIONS $version"
  #         done
  #         CHANGED_VERSIONS=$(echo "$CHANGED_VERSIONS" | xargs) # trim whitespace
  #         echo "versions_changed=$CHANGED_VERSIONS" >> $GITHUB_OUTPUT
      
  #     - name: Detect Minecraft versions without build-info
  #       id: check_new_versions
  #       run: |
  #         NEW_VERSIONS=""
  #         GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
  #         git clone --depth=1 "https://${{ secrets.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/minecraft.git" upload-repo

  #         for version in $VERSIONS; do
  #           if [ ! -f "upload-repo/$version/build-info.json" ]; then
  #             echo "[INFO] No build-info.json for $version → treating as new"
  #             NEW_VERSIONS="$NEW_VERSIONS $version"
  #           fi
  #         done

  #         echo "new_versions=$NEW_VERSIONS" >> $GITHUB_OUTPUT

  build-minecraft-images:
    runs-on: vm-docker-build2
    needs:
      - docker-prune
    # if: |
    #   needs.poll-debian-base-and-detect-changes.outputs.digest_changed == 'true' ||
    #   needs.poll-debian-base-and-detect-changes.outputs.versions_changed != '' ||
    #   needs.poll-debian-base-and-detect-changes.outputs.new_versions != ''
    strategy:
      matrix:
        version: [testing, vanilla, fabric, neoforged, forge, bukkit, quilt]
    name: Build and Push ${{ matrix.version }}
    steps:
      - name: Checkout repo
        uses: actions/checkout@v3

      - name: Log in to Gitea Registry
        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login gitea.fithwum.tech -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin

      - name: Clone Minecraft repo (with retries)
        run: |
          GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
          for i in {1..5}; do
            git clone "https://${{ secrets.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/minecraft.git" upload-repo && break
            echo "[WARN] Clone attempt $i failed. Retrying in 10s..."
            sleep 10
          done
          if [ ! -d upload-repo ]; then
            echo "[ERROR] Failed to clone Minecraft repo after retries."
            exit 1
          fi

      - name: Build and push image
        run: |
          IMAGE="$IMAGE_REGISTRY/$IMAGE_ORG/$IMAGE_REPO_MINECRAFT:${{ matrix.version }}"
          docker buildx build --platform linux/amd64 --push -t "$IMAGE" "./${{ matrix.version }}"

  generate-changelogs:
    needs: build-minecraft-images
    runs-on: vm-docker-build2
    steps:
      - name: Checkout repo
        uses: actions/checkout@v3

      - name: Create temporary changelog workspace
        run: mkdir -p changelogs

      - name: Clone Minecraft repo
        run: |
          GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
          git clone --depth=3 "https://${{ secrets.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/minecraft.git" upload-repo

      - name: Generate changelogs
        run: |
          for version in $VERSIONS; do
            echo "[INFO] Generating changelog for $version"
            changelog="changelogs/$version/CHANGES.md"
            mkdir -p "$(dirname "$changelog")"
            touch "$changelog"

            cd upload-repo
            infofile="$version/build-info.json"
            last_commit=""
            if [ -f "$infofile" ]; then
              last_commit=$(jq -r '.commit' "$infofile")
            fi

            echo -e "## $(date -u +'%Y-%m-%dT%H:%M:%SZ')\n" > "../$changelog"
            if [ -n "$last_commit" ]; then
              COMMITS=$(git log "${last_commit}..HEAD" --pretty=format:"- %s (%an)" || true)
            fi
            if [ -z "$COMMITS" ]; then
              echo "[INFO] No new commits since last build. Showing latest 5 instead."
              COMMITS=$(git log -n 5 --pretty=format:"- %s (%an)" || true)
            fi
            echo "$COMMITS" >> "../$changelog"
            cd ..
          done

      - name: Copy changelogs into repo
        run: |
          for version in $VERSIONS; do
            mkdir -p upload-repo/$version
            cp changelogs/$version/CHANGES.md upload-repo/$version/
          done

      - name: Commit and push changelogs
        run: |
          cd upload-repo
          git config user.name "${{ secrets.GIT_USERNAME }}"
          git config user.email "${{ secrets.GIT_EMAIL }}"

          if git status --porcelain | grep .; then
            git add */CHANGES.md
            git commit -m "Update changelogs on $(date -u +'%Y-%m-%dT%H:%M:%SZ')" --no-verify
            git push
          else
            echo "[INFO] No changelog changes to commit."
          fi

  generate-build-info:
    needs: generate-changelogs
    runs-on: vm-docker-build2
    steps:
      - name: Checkout repo
        uses: actions/checkout@v3

      - name: Prepare temporary build-info workspace
        run: mkdir -p buildinfo

      - name: Clone Minecraft repo
        run: |
          GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
          git clone --depth=1 "https://${{ secrets.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/minecraft.git" upload-repo

      - name: Generate build-info files
        run: |
          human_size() {
            local b=$1 d='' s=0 S=(B KB MB GB TB)
            while ((b >= 1024 && s < ${#S[@]}-1)); do
              d=$((b % 1024)); b=$((b / 1024)); s=$((s + 1))
            done
            printf "%s%s\n" "$b" "${S[$s]}"
          }

          for version in $VERSIONS; do
            echo "[INFO] Generating build-info.json for $version"
            image="${IMAGE_REGISTRY}/${IMAGE_ORG}/${IMAGE_REPO_MINECRAFT}:$version"
            infofile="buildinfo/$version/build-info.json"
            mkdir -p "$(dirname "$infofile")"

            if ! docker pull "$image"; then
              echo "[WARN] Failed to pull $image — setting fields to unknown/0"
              digest="unknown"
              size_bytes=0
            else
              digest=$(docker inspect --format='{{if .RepoDigests}}{{index .RepoDigests 0}}{{else}}unknown{{end}}' "$image" 2>/dev/null || echo "unknown")
              size_bytes=$(docker image inspect "$image" --format='{{.Size}}' 2>/dev/null || echo "0")
              size_bytes=${size_bytes//[^0-9]/}
              if [[ -z "$size_bytes" ]]; then size_bytes=0; fi
            fi

            size_human=$(human_size "$size_bytes")

            cd upload-repo
            commit=$(git rev-parse HEAD)
            cd ..

            jq -n \
              --arg version "$version" \
              --arg commit "$commit" \
              --arg build_time "$(date -u +'%Y-%m-%dT%H:%M:%SZ')" \
              --arg image_tag "$image" \
              --arg digest "$digest" \
              --arg image_size "$size_human" \
              --argjson image_size_bytes "$size_bytes" \
              '{
                version: $version,
                commit: $commit,
                build_time: $build_time,
                image_tag: $image_tag,
                digest: $digest,
                image_size: $image_size,
                image_size_bytes: $image_size_bytes
              }' > "$infofile"
          done

      - name: Copy build-info.json into repo
        run: |
          for version in $VERSIONS; do
            mkdir -p upload-repo/$version
            cp "buildinfo/$version/build-info.json" "upload-repo/$version/"
          done

      - name: Commit and push build-info
        run: |
          cd upload-repo
          git config user.name "${{ secrets.GIT_USERNAME }}"
          git config user.email "${{ secrets.GIT_EMAIL }}"

          if git status --porcelain | grep .; then
            git add */build-info.json
            git commit -m "Update build-info on $(date -u +'%Y-%m-%dT%H:%M:%SZ')"
            git push

            for version in $VERSIONS; do
              TAG="build-$version"
              git tag -d "$TAG" 2>/dev/null || true
              git tag "$TAG"
              git push origin "$TAG" --force
            done
          else
            echo "[INFO] No build-info changes to commit."
          fi