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

name: minecraft-build-minecraft

on:
  push:
    branches:
      - master
    paths:
      - '.gitea/workflows/minecraft-build-minecraft.yml'
      - 'minecraft/Dockerfile'
      - 'minecraft/*.sh'
      - '!.cache/*'
      - '!minecraft/CHANGES.md'
      - '!minecraft/build-info.json'
  schedule:
    - cron: '35 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: minecraft

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

  build-minecraft-images:
    runs-on: vm-docker-build2
    needs: docker-prune
    strategy:
      matrix:
        version: [minecraft]
    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: Clear BuildKit cache
        run: |
          docker builder prune -af || true
          docker buildx prune -af || true

      - name: Build and push image
        run: |
          IMAGE="$IMAGE_REGISTRY/$IMAGE_ORG/$IMAGE_REPO_MINECRAFT:${{ matrix.version }}"
          docker buildx build --platform linux/amd64 --pull --no-cache --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 (temp branch)
        run: |
          cd upload-repo

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

          TEMP_BRANCH="tmp-changelog-$(date +%s)"

          # Create temporary branch
          git checkout -b "$TEMP_BRANCH"

          # Stage changes
          git add */CHANGES.md

          # Nothing changed?
          if git diff --cached --quiet; then
            echo "[INFO] No changelog changes."
            exit 0
          fi

          git commit -m "Update changelogs on $(date -u +'%Y-%m-%dT%H:%M:%SZ') [skip ci]"

          # Push temporary branch
          git push origin HEAD:$TEMP_BRANCH

          # Rebase temp branch onto latest master
          git fetch origin master

          git checkout "$TEMP_BRANCH"

          if ! git rebase origin/master; then
            echo "[WARN] Rebase failed, using merge instead."
            git rebase --abort || true
            git merge origin/master --no-edit
          fi

          git push origin HEAD:$TEMP_BRANCH --force

          # Fast-forward master
          git checkout master
          git reset --hard origin/master

          git merge --no-ff "$TEMP_BRANCH" \
            -m "Merge changelog updates"

          git push origin master

          git push origin --delete "$TEMP_BRANCH" || true

  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 (temp branch)
        run: |
          cd upload-repo

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

          TEMP_BRANCH="tmp-buildinfo-$(date +%s)"

          # Create temporary branch
          git checkout -b "$TEMP_BRANCH"

          # Stage changes
          git add */build-info.json

          # Nothing changed?
          if git diff --cached --quiet; then
            echo "[INFO] No build-info changes."
            exit 0
          fi

          git commit -m "Update build-info on $(date -u +'%Y-%m-%dT%H:%M:%SZ') [skip ci]"

          # Push temporary branch
          git push origin HEAD:$TEMP_BRANCH

          # Rebase temp branch onto latest master
          git fetch origin master

          git checkout "$TEMP_BRANCH"

          if ! git rebase origin/master; then
            echo "[WARN] Rebase failed, using merge instead."
            git rebase --abort || true
            git merge origin/master --no-edit
          fi

          git push origin HEAD:$TEMP_BRANCH --force

          # Merge into master
          git checkout master
          git reset --hard origin/master

          git merge --no-ff "$TEMP_BRANCH" \
            -m "Merge build-info updates"

          git push origin master

          git push origin --delete "$TEMP_BRANCH" || true

          for version in $VERSIONS; do
            TAG="build-$version"

            git tag -d "$TAG" 2>/dev/null || true
            git push origin ":refs/tags/$TAG" 2>/dev/null || true

            git tag "$TAG"
            git push origin "$TAG" --force
          done