apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: jemalloc-builder
  namespace: gitlab
  labels:
    app: jemalloc-builder
spec:
  selector:
    matchLabels:
      app: jemalloc-builder
  template:
    metadata:
      labels:
        app: jemalloc-builder
    spec:
      tolerations:
      - operator: Exists
      initContainers:
      - name: build
        image: alpine:latest
        command:
        - sh
        - -c
        - |
          set -e
          TARGET=/hostlib/libjemalloc.so.2
          if [ -f "$TARGET" ]; then
            echo "Already built at $TARGET — skipping."
            exit 0
          fi
          echo "Installing build tools..."
          apk add --no-cache gcc musl-dev make wget autoconf 2>&1
          cd /tmp
          echo "Downloading jemalloc 5.3.0..."
          wget -q -O jemalloc.tar.bz2 \
            https://github.com/jemalloc/jemalloc/releases/download/5.3.0/jemalloc-5.3.0.tar.bz2
          tar xf jemalloc.tar.bz2
          cd jemalloc-5.3.0
          echo "Configuring with --with-lg-page=14 (16KB page support)..."
          ./configure --with-lg-page=14 --disable-stats --disable-prof --disable-fill 2>&1
          echo "Building..."
          make -j2 lib/libjemalloc.so.2 2>&1
          cp lib/libjemalloc.so.2 "$TARGET"
          chmod 755 "$TARGET"
          echo "Done: $(ls -lh $TARGET)"
        volumeMounts:
        - name: hostlib
          mountPath: /hostlib
      containers:
      - name: keepalive
        image: alpine:latest
        command: [sh, -c, "echo 'jemalloc ready at /opt/gitlab-jemalloc/libjemalloc.so.2'; sleep infinity"]
        volumeMounts:
        - name: hostlib
          mountPath: /hostlib
      volumes:
      - name: hostlib
        hostPath:
          path: /opt/gitlab-jemalloc
          type: DirectoryOrCreate