stack/docker/local-emulator/qemu/cloud-init/emulator/user-data

#cloud-config

hostname: stack-emulator
manage_etc_hosts: true

users:
  - name: stack
    shell: /bin/bash
    sudo: ALL=(ALL) NOPASSWD:ALL
    lock_passwd: false

chpasswd:
  list: |
    root:stack-emulator
    stack:stack-emulator
  expire: false

ssh_pwauth: false

package_update: true
package_upgrade: false

packages:
  - docker.io
  - ca-certificates
  - curl
  - netcat-openbsd
  - qemu-guest-agent

write_files:
  - path: /usr/local/bin/install-emulator-containers
    permissions: '0755'
    content: |
      #!/bin/bash
      set -euo pipefail

      mkdir -p /mnt/stack-bundle
      bundle_device="$(readlink -f /dev/disk/by-label/STACKBUNDLE)"
      mount -o ro "$bundle_device" /mnt/stack-bundle

      systemctl enable --now docker
      until docker info >/dev/null 2>&1; do sleep 1; done

      gzip -dc /mnt/stack-bundle/img.tgz | docker load

      if [ -f /mnt/stack-bundle/build.env ]; then
        cp /mnt/stack-bundle/build.env /etc/stack-build.env
      fi

      # build-arch.env lets the guest skip the smoke test on cross-arch TCG.
      if [ -f /mnt/stack-bundle/build-arch.env ]; then
        cp /mnt/stack-bundle/build-arch.env /etc/stack-build-arch.env
      fi

  - path: /usr/local/bin/render-stack-env
    permissions: '0755'
    content: |
      #!/bin/bash
      set -euo pipefail

      mkdir -p /mnt/stack-runtime /run/stack-auth /var/lib/stack-auth
      runtime_device="$(readlink -f /dev/disk/by-label/STACKCFG)"
      mountpoint -q /mnt/stack-runtime || mount -o ro "$runtime_device" /mnt/stack-runtime

      set -a
      source /mnt/stack-runtime/runtime.env
      source /mnt/stack-runtime/base.env
      set +a

      # Generate and persist the internal-project keys on first boot; reuse
      # across container restarts so the dashboard keeps its internal-project
      # session. Reset via `stack emulator reset`.
      #
      # pck: used by stack-cli to auth against /api/v1/internal/local-emulator/project
      # ssk/sak: required by the emulator's own dashboard (StackServerApp
      #   construction throws without them). Not used by user-app flows; the
      #   /local-emulator/project route mints separate per-project credentials.
      umask 077
      for key in internal-pck internal-ssk internal-sak; do
        if [ ! -s "/var/lib/stack-auth/$key" ]; then
          openssl rand -hex 32 > "/var/lib/stack-auth/$key"
        fi
      done
      INTERNAL_PCK="$(cat /var/lib/stack-auth/internal-pck)"
      INTERNAL_SSK="$(cat /var/lib/stack-auth/internal-ssk)"
      INTERNAL_SAK="$(cat /var/lib/stack-auth/internal-sak)"

      # Container-local dependencies run on localhost. Host-only development
      # services (such as the OAuth mock server) are reachable via the QEMU
      # user-network host alias.
      DEPS_HOST=127.0.0.1
      HOST_SERVICES_HOST=10.0.2.2
      P="$STACK_EMULATOR_PORT_PREFIX"

      {
        # Static vars from base config and runtime (e.g. API keys, feature flags)
        cat /mnt/stack-runtime/base.env
        cat /mnt/stack-runtime/runtime.env
        printf 'STACK_SEED_INTERNAL_PROJECT_PUBLISHABLE_CLIENT_KEY=%s\n' "$INTERNAL_PCK"
        printf 'STACK_SEED_INTERNAL_PROJECT_SECRET_SERVER_KEY=%s\n' "$INTERNAL_SSK"
        printf 'STACK_SEED_INTERNAL_PROJECT_SUPER_SECRET_ADMIN_KEY=%s\n' "$INTERNAL_SAK"

        # Computed vars — depend on port prefix or deps host
        # Host-side ports (for browser URLs — browser runs on host, not in VM)
        HP_BACKEND="$STACK_EMULATOR_BACKEND_HOST_PORT"
        HP_DASHBOARD="$STACK_EMULATOR_DASHBOARD_HOST_PORT"
        HP_MINIO="$STACK_EMULATOR_MINIO_HOST_PORT"
        HP_INBUCKET="$STACK_EMULATOR_INBUCKET_HOST_PORT"

        cat <<COMPUTED
      STACK_SKIP_MIGRATIONS=true
      STACK_SKIP_SEED_SCRIPT=true
      NEXT_PUBLIC_STACK_PORT_PREFIX=${P}
      STACK_RUNTIME_WORK_DIR=/app
      STACK_LOCAL_EMULATOR_HOST_MOUNT_ROOT=/host
      NEXT_PUBLIC_STACK_API_URL=http://localhost:${HP_BACKEND}
      NEXT_PUBLIC_STACK_DASHBOARD_URL=http://localhost:${HP_DASHBOARD}
      NEXT_PUBLIC_BROWSER_STACK_API_URL=http://localhost:${HP_BACKEND}
      NEXT_PUBLIC_BROWSER_STACK_DASHBOARD_URL=http://localhost:${HP_DASHBOARD}
      NEXT_PUBLIC_SERVER_STACK_API_URL=http://127.0.0.1:${P}02
      NEXT_PUBLIC_SERVER_STACK_DASHBOARD_URL=http://127.0.0.1:${P}01
      NEXT_PUBLIC_STACK_SVIX_SERVER_URL=http://localhost:${HP_BACKEND}
      STACK_DATABASE_CONNECTION_STRING=postgres://postgres:PASSWORD-PLACEHOLDER--uqfEC1hmmv@${DEPS_HOST}:5432/stackframe
      STACK_EMAIL_HOST=${DEPS_HOST}
      STACK_SVIX_SERVER_URL=http://${DEPS_HOST}:8071
      STACK_S3_ENDPOINT=http://${DEPS_HOST}:9090
      STACK_S3_PUBLIC_ENDPOINT=http://localhost:${HP_MINIO}/stack-storage
      STACK_QSTASH_URL=http://${DEPS_HOST}:8080
      STACK_CLICKHOUSE_URL=http://${DEPS_HOST}:8123
      STACK_EMAIL_MONITOR_VERIFICATION_CALLBACK_URL=http://localhost:${HP_DASHBOARD}/handler/email-verification
      STACK_EMAIL_MONITOR_INBUCKET_API_URL=http://${DEPS_HOST}:9001
      STACK_OAUTH_MOCK_URL=http://localhost:${P}14
      STACK_FREESTYLE_API_ENDPOINT=http://${DEPS_HOST}:8180
      STACK_STRIPE_MOCK_PORT=12111
      NEXT_PUBLIC_STACK_STRIPE_PUBLISHABLE_KEY=pk_test_mock_publishable_key_for_local_emulator
      BACKEND_PORT=${P}02
      DASHBOARD_PORT=${P}01
      COMPUTED
      } > /run/stack-auth/local-emulator.env

  - path: /usr/local/bin/mount-host-fs
    permissions: '0755'
    content: |
      #!/bin/bash
      set -euo pipefail
      mkdir -p /host
      if ! mountpoint -q /host; then
        if ! mount -t 9p -o trans=virtio,version=9p2000.L hostfs /host; then
          echo "Failed to mount host filesystem at /host" >&2
          exit 1
        fi
      fi

  - path: /usr/local/bin/run-stack-container
    permissions: '0755'
    content: |
      #!/bin/bash
      set -euo pipefail

      /usr/local/bin/mount-host-fs
      /usr/local/bin/render-stack-env

      # Publish the internal publishable client key to the host via 9p so the
      # stack-cli can authenticate its bootstrap call to
      # /api/v1/internal/local-emulator/project.
      set -a
      source /mnt/stack-runtime/runtime.env
      set +a
      if [ -n "${STACK_EMULATOR_VM_DIR_HOST:-}" ] && [ -s /var/lib/stack-auth/internal-pck ]; then
        install -m 0600 /var/lib/stack-auth/internal-pck \
          "/host${STACK_EMULATOR_VM_DIR_HOST}/internal-pck"
      fi

      docker rm -f stack >/dev/null 2>&1 || true

      # Mirror container stdout/stderr to a host-visible log for debugging.
      # The container already bind-mounts /host:/host, so we reuse that path.
      # Falls back to stdout (captured by systemd-journald) when no host log is set.
      if [ -n "${STACK_EMULATOR_VM_DIR_HOST:-}" ]; then
        host_log="/host${STACK_EMULATOR_VM_DIR_HOST}/stack.log"
        : > "$host_log" 2>/dev/null || true
        exec docker run \
          --rm \
          --name stack \
          --network host \
          --add-host host.docker.internal:host-gateway \
          --env-file /run/stack-auth/local-emulator.env \
          -v stack-postgres-data:/data/postgres \
          -v stack-redis-data:/data/redis \
          -v stack-clickhouse-data:/data/clickhouse \
          -v stack-minio-data:/data/minio \
          -v stack-inbucket-data:/data/inbucket \
          -v /host:/host \
          stack-local-emulator 2>&1 | tee -a "$host_log"
      else
        exec docker run \
          --rm \
          --name stack \
          --network host \
          --add-host host.docker.internal:host-gateway \
          --env-file /run/stack-auth/local-emulator.env \
          -v stack-postgres-data:/data/postgres \
          -v stack-redis-data:/data/redis \
          -v stack-clickhouse-data:/data/clickhouse \
          -v stack-minio-data:/data/minio \
          -v stack-inbucket-data:/data/inbucket \
          -v /host:/host \
          stack-local-emulator
      fi

  - path: /usr/local/bin/wait-for-deps
    permissions: '0755'
    content: |
      #!/bin/bash
      set -uo pipefail

      # Hard upper bound across the whole dep wait. Under TCG every service
      # init is 5-20x slower than native, so we allow a generous budget, but
      # if we cross it something is genuinely stuck and we need to surface it.
      DEPS_TIMEOUT="${STACK_DEPS_TIMEOUT:-1500}"
      DEPS_CONTAINER="${STACK_DEPS_CONTAINER:-stack-build-init}"
      start=$SECONDS
      log() { /usr/local/bin/log-provision "wait-for-deps: $*"; }

      # name|probe pairs — probe runs through `eval` and must exit 0 when ready.
      # No --max-time on these: under slow TCG a service may take >3s to
      # respond; let curl wait, outer DEPS_TIMEOUT bounds the whole dep wait.
      SERVICES=(
        'postgres|nc -z 127.0.0.1 5432'
        'clickhouse|curl -sf http://127.0.0.1:8123/ping'
        'svix|curl -sf http://127.0.0.1:8071/api/v1/health/'
        'minio|curl -sf http://127.0.0.1:9090/minio/health/live'
        'qstash|[ "$(curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:8080/ 2>/dev/null || true)" = "401" ]'
      )

      dump_diagnostics() {
        log "dumping diagnostics for stuck dep wait..."
        log "--- docker ps -a ---"
        docker ps -a 2>&1 | /usr/local/bin/log-provision-stream "wait-for-deps: ps" || true
        log "--- docker logs ${DEPS_CONTAINER} (last 300 lines) ---"
        docker logs --tail 300 "$DEPS_CONTAINER" 2>&1 | /usr/local/bin/log-provision-stream "wait-for-deps: deps" || true
        log "--- per-service probes (3s timeout) ---"
        nc -z -w 3 127.0.0.1 5432 >/dev/null 2>&1 && log "postgres:5432 reachable" || log "postgres:5432 NOT reachable"
        curl -sf --max-time 3 http://127.0.0.1:8123/ping >/dev/null 2>&1 && log "clickhouse:8123 reachable" || log "clickhouse:8123 NOT reachable"
        curl -sf --max-time 3 http://127.0.0.1:8071/api/v1/health/ >/dev/null 2>&1 && log "svix:8071 reachable" || log "svix:8071 NOT reachable"
        curl -sf --max-time 3 http://127.0.0.1:9090/minio/health/live >/dev/null 2>&1 && log "minio:9090 reachable" || log "minio:9090 NOT reachable"
        code=$(curl -s -o /dev/null -w '%{http_code}' --max-time 3 http://127.0.0.1:8080/ 2>/dev/null || true)
        [ "$code" = "401" ] && log "qstash:8080 reachable (401)" || log "qstash:8080 NOT reachable (code=${code:-none})"
      }

      wait_for() {
        local name="$1" probe="$2" elapsed
        local svc_start=$SECONDS
        local next_heartbeat=$((svc_start + 30))
        while true; do
          if eval "$probe" >/dev/null 2>&1; then
            elapsed=$((SECONDS - svc_start))
            log "${name} ready (${elapsed}s)"
            return 0
          fi
          if [ "$SECONDS" -ge "$next_heartbeat" ]; then
            log "still waiting for ${name} ($((SECONDS - svc_start))s elapsed)"
            next_heartbeat=$((SECONDS + 30))
          fi
          if [ "$((SECONDS - start))" -ge "$DEPS_TIMEOUT" ]; then
            elapsed=$((SECONDS - start))
            log "TIMEOUT waiting for ${name} after ${elapsed}s (hard cap ${DEPS_TIMEOUT}s)"
            dump_diagnostics
            exit 1
          fi
          sleep 2
        done
      }

      log "starting dep wait (timeout=${DEPS_TIMEOUT}s)"
      for entry in "${SERVICES[@]}"; do
        wait_for "${entry%%|*}" "${entry#*|}"
      done
      log "all deps ready ($((SECONDS - start))s total)"

  - path: /etc/stack-build-computed.env
    content: |
      USE_INLINE_ENV_VARS=true
      NEXT_PUBLIC_STACK_API_URL=http://localhost:8102
      NEXT_PUBLIC_STACK_DASHBOARD_URL=http://localhost:8101
      NEXT_PUBLIC_BROWSER_STACK_API_URL=http://localhost:8102
      NEXT_PUBLIC_BROWSER_STACK_DASHBOARD_URL=http://localhost:8101
      NEXT_PUBLIC_SERVER_STACK_API_URL=http://127.0.0.1:8102
      NEXT_PUBLIC_SERVER_STACK_DASHBOARD_URL=http://127.0.0.1:8101
      NEXT_PUBLIC_STACK_SVIX_SERVER_URL=http://localhost:8071
      NEXT_PUBLIC_STACK_PORT_PREFIX=81
      STACK_CLICKHOUSE_DATABASE=default
      BACKEND_PORT=8102
      DASHBOARD_PORT=8101

  - path: /usr/local/bin/log-provision
    permissions: '0755'
    content: |
      #!/bin/bash
      set -euo pipefail

      msg="$*"
      echo "STACK_PROVISION: $msg"
      if [ -n "${STACK_PROVISION_LOG_FILE:-}" ]; then
        printf '%s\n' "$msg" >> "$STACK_PROVISION_LOG_FILE"
      fi

  - path: /usr/local/bin/log-provision-stream
    permissions: '0755'
    content: |
      #!/bin/bash
      set -uo pipefail

      prefix="${1:-}"
      while IFS= read -r line; do
        /usr/local/bin/log-provision "${prefix}: ${line}"
      done

  - path: /usr/local/bin/run-build-migrations
    permissions: '0755'
    content: |
      #!/bin/bash
      set -euo pipefail

      log() { /usr/local/bin/log-provision "$*"; }

      log "Starting deps container..."
      docker run --rm --name stack-build-init \
        --network host \
        -e STACK_DEPS_ONLY=true \
        -v stack-postgres-data:/data/postgres \
        -v stack-redis-data:/data/redis \
        -v stack-clickhouse-data:/data/clickhouse \
        -v stack-minio-data:/data/minio \
        -v stack-inbucket-data:/data/inbucket \
        -d stack-local-emulator

      log "Waiting for deps (postgres, redis, clickhouse, minio, qstash)..."
      /usr/local/bin/wait-for-deps
      log "Deps ready."

      # Wait for init-services.sh (MinIO buckets, ClickHouse DB creation)
      log "Waiting for init-services.sh..."
      timeout=120
      elapsed=0
      while [ "$elapsed" -lt "$timeout" ]; do
        if docker exec stack-build-init test -f /var/run/stack-local-init-services.done 2>/dev/null; then
          break
        fi
        sleep 1
        elapsed=$((elapsed + 1))
      done
      if [ "$elapsed" -ge "$timeout" ]; then
        log "ERROR: init-services.sh did not finish within ${timeout}s"
        exit 1
      fi
      log "init-services done (${elapsed}s)."

      log "Running migrations..."
      # Cross-arch TCG mistranslates V8's JIT-emitted arm64, and V8's wasm
      # tier-up path trips an InnerPointerToCodeCache check deep in the heap
      # (Runtime_WasmTriggerTierUp → StackFrameIterator::Advance crashes
      # when Wasm code has been freed while a frame still references it).
      # --no-opt            keeps JS off TurboFan/Maglev
      # --no-wasm-tier-up   keeps Wasm on Liftoff (no TurboFan)
      # --no-wasm-dynamic-tiering suppresses the tier-up decision runtime call
      # --no-wasm-code-gc   keeps Wasm code alive across stack walks
      # All four are no-ops under KVM, and must be passed on node's CLI
      # (NODE_OPTIONS rejects them).
      migrate_log="$(mktemp)"
      set +e
      docker exec \
        --env-file /etc/stack-build.env \
        --env-file /etc/stack-build-computed.env \
        stack-build-init \
        sh -c 'cd /app/apps/backend && node --no-opt --no-wasm-tier-up --no-wasm-dynamic-tiering --no-wasm-code-gc dist/db-migrations.mjs migrate && node --no-opt --no-wasm-tier-up --no-wasm-dynamic-tiering --no-wasm-code-gc dist/db-migrations.mjs seed' \
        > "$migrate_log" 2>&1
      migrate_status=$?
      set -e
      if [ "$migrate_status" -ne 0 ]; then
        log "MIGRATIONS FAILED (exit ${migrate_status}) — last 200 lines of migration output:"
        tail -200 "$migrate_log" | /usr/local/bin/log-provision-stream "migrate" || true
        rm -f "$migrate_log"
        exit "$migrate_status"
      fi
      rm -f "$migrate_log"
      log "Migrations + seed complete."

      log "Stopping deps container..."
      docker stop stack-build-init || true
      log "run-build-migrations done."

  - path: /usr/local/bin/slim-docker-image
    permissions: '0755'
    content: |
      #!/bin/bash
      set -euo pipefail

      log() { /usr/local/bin/log-provision "$*"; }

      log "Building slim Docker image..."
      docker build -t stack-local-emulator-slim - <<'DOCKERFILE'
      FROM stack-local-emulator
      RUN rm -rf /app/node_modules /app/apps/backend/dist && \
          mv /app/node_modules.standalone /app/node_modules && \
          for entry in /app/node_modules/.pnpm/node_modules/*; do \
            name="$(basename "$entry")"; \
            [ "$name" = ".bin" ] && continue; \
            ln -sf ".pnpm/node_modules/$name" "/app/node_modules/$name" 2>/dev/null || true; \
          done
      DOCKERFILE
      log "Slim image built."

      # Determine build arch to decide whether to run the smoke test. Cross-arch
      # (TCG) builds can't reliably run the Next.js backend inside the smoke
      # test container: V8 JIT ↔ QEMU TCG mistranslations crash the process,
      # and even with --jitless the backend is too slow to respond within any
      # sane timeout. amd64 builds run under KVM and are unaffected.
      BUILD_ARCH=""
      if [ -f /etc/stack-build-arch.env ]; then
        # shellcheck disable=SC1091
        . /etc/stack-build-arch.env
        BUILD_ARCH="${STACK_EMULATOR_BUILD_ARCH:-}"
      fi

      if [ "$BUILD_ARCH" = "arm64" ]; then
        log "Skipping smoke test: build arch is arm64 and cross-arch TCG can't reliably run the backend."
      else
        log "Running smoke test on slim image..."
        # build.env sets NEXT_PUBLIC_STACK_IS_LOCAL_EMULATOR=true, which makes
        # docker/server/entrypoint.sh require the three internal SEED keys.
        # At real-VM boot those come from render-stack-env via
        # /run/stack-auth/local-emulator.env, but that path doesn't run during
        # the build-time smoke test. Mint throwaway hex keys for this container
        # only; they must be hex because entrypoint.sh also validates that
        # before the internal ApiKeySet bootstrap SQL.
        SMOKE_PCK="$(openssl rand -hex 32)"
        SMOKE_SSK="$(openssl rand -hex 32)"
        SMOKE_SAK="$(openssl rand -hex 32)"
        docker run --rm --name smoke-test \
          --network host \
          --env-file /etc/stack-build.env \
          --env-file /etc/stack-build-computed.env \
          -e STACK_SEED_INTERNAL_PROJECT_PUBLISHABLE_CLIENT_KEY="$SMOKE_PCK" \
          -e STACK_SEED_INTERNAL_PROJECT_SECRET_SERVER_KEY="$SMOKE_SSK" \
          -e STACK_SEED_INTERNAL_PROJECT_SUPER_SECRET_ADMIN_KEY="$SMOKE_SAK" \
          -e STACK_SKIP_MIGRATIONS=true \
          -e STACK_SKIP_SEED_SCRIPT=true \
          -e STACK_RUNTIME_WORK_DIR=/app \
          -v stack-postgres-data:/data/postgres \
          -v stack-redis-data:/data/redis \
          -v stack-clickhouse-data:/data/clickhouse \
          -v stack-minio-data:/data/minio \
          -v stack-inbucket-data:/data/inbucket \
          -d stack-local-emulator-slim

        smoke_timeout=300
        smoke_elapsed=0
        smoke_passed=false
        while [ "$smoke_elapsed" -lt "$smoke_timeout" ]; do
          code=$(curl -s -o /dev/null -w "%{http_code}" --max-time 3 http://127.0.0.1:8102/health?db=1 2>/dev/null || true)
          if [ "$code" = "200" ]; then
            smoke_passed=true
            break
          fi
          sleep 2
          smoke_elapsed=$((smoke_elapsed + 2))
        done

        if [ "$smoke_passed" = "false" ]; then
          log "SMOKE TEST FAILED: backend /health?db=1 did not return 200 within ${smoke_timeout}s"
          log "--- docker ps -a ---"
          docker ps -a 2>&1 | /usr/local/bin/log-provision-stream "ps" || true
          log "--- smoke-test container logs (last 200 lines) ---"
          docker logs --tail 200 smoke-test 2>&1 | /usr/local/bin/log-provision-stream "smoke-test" || true
          log "--- free -m ---"
          free -m 2>&1 | /usr/local/bin/log-provision-stream "mem" || true
          log "--- curl -v /health?db=1 ---"
          curl -v --max-time 5 http://127.0.0.1:8102/health?db=1 2>&1 | /usr/local/bin/log-provision-stream "curl" || true
          docker stop smoke-test 2>/dev/null || true
          exit 1
        fi

        docker stop smoke-test 2>/dev/null || true
        sleep 2
        log "Smoke test passed (${smoke_elapsed}s)."
      fi

      log "Flattening image (docker export/import)..."
      docker create --name flatten stack-local-emulator-slim /bin/true
      docker export flatten | docker import \
        --change 'WORKDIR /app' \
        --change 'ENTRYPOINT ["/entrypoint.sh"]' \
        --change 'EXPOSE 5432 6379 2500 9001 1100 8071 8123 9009 9090 8080 8101 8102' \
        --change 'ENV DEBIAN_FRONTEND=noninteractive' \
        - stack-local-emulator:final
      log "Flatten done."

      log "Saving final image to /var/tmp..."
      docker rm flatten
      docker save stack-local-emulator:final -o /var/tmp/final-image.tar
      mv /var/lib/docker/volumes /var/tmp/volumes-backup
      log "Nuking Docker storage and reloading..."
      systemctl stop docker containerd
      rm -rf /var/lib/docker /var/lib/containerd
      systemctl start docker containerd
      until docker info >/dev/null 2>&1; do sleep 1; done
      docker load -i /var/tmp/final-image.tar
      docker tag stack-local-emulator:final stack-local-emulator
      docker rmi stack-local-emulator:final || true
      rm -f /var/tmp/final-image.tar
      systemctl stop docker
      rm -rf /var/lib/docker/volumes
      mv /var/tmp/volumes-backup /var/lib/docker/volumes
      systemctl start docker
      log "Docker storage rebuilt."

      log "Zeroing free space for qcow2 compression..."
      dd if=/dev/zero of=/zero.fill bs=1M 2>/dev/null || true
      rm -f /zero.fill
      sync
      fstrim -av 2>/dev/null || true
      log "slim-docker-image done."

  - path: /etc/systemd/system/stack.service
    content: |
      [Unit]
      Description=Stack Auth local emulator
      Wants=network-online.target docker.service
      After=network-online.target docker.service

      [Service]
      Restart=always
      RestartSec=5
      TimeoutStartSec=0
      ExecStart=/usr/local/bin/run-stack-container
      ExecStop=/usr/bin/docker stop stack

      [Install]
      WantedBy=multi-user.target

  - path: /usr/local/bin/provision-build
    permissions: '0755'
    content: |
      #!/bin/bash
      set -euo pipefail

      if bash /usr/local/bin/mount-host-fs 2>/dev/null; then
        export STACK_PROVISION_LOG_FILE=/host/provision.log
        : > "$STACK_PROVISION_LOG_FILE"
      else
        export STACK_PROVISION_LOG_FILE=""
      fi

      write_marker_to_consoles() {
        local marker="$1"
        for dev in /dev/console /dev/ttyAMA0 /dev/ttyS0; do
          echo "$marker" > "$dev" 2>/dev/null || true
        done
      }

      cleanup() {
        local status=$?
        if [ "$status" -ne 0 ]; then
          if [ -n "${STACK_PROVISION_LOG_FILE:-}" ]; then
            printf 'ERROR: provision-build exited with code %s\n' "$status" >> "$STACK_PROVISION_LOG_FILE"
            printf '%s\n' "STACK_CLOUD_INIT_FAILED" >> "$STACK_PROVISION_LOG_FILE"
          fi
          write_marker_to_consoles "STACK_CLOUD_INIT_FAILED"
          sync || true
          (sleep 2 && shutdown -P now) &
          (sleep 15 && poweroff -f) &
        fi
      }
      trap cleanup EXIT

      SERIAL=""
      for d in /dev/ttyAMA0 /dev/ttyS0; do
        [ -c "$d" ] && SERIAL="$d" && break
      done
      if [ -n "$SERIAL" ]; then
        exec > >(tee -a "$SERIAL") 2>&1
      fi

      log_provision() {
        /usr/local/bin/log-provision "$*"
      }

      log_provision "runcmd starting"

      systemctl disable --now ssh || true
      systemctl mask ssh || true

      log_provision "installing emulator containers"
      bash /usr/local/bin/install-emulator-containers

      systemctl daemon-reload
      systemctl enable stack.service

      log_provision "starting build migrations"
      bash /usr/local/bin/run-build-migrations

      log_provision "starting slim-docker-image"
      bash /usr/local/bin/slim-docker-image

      log_provision "build pipeline complete"
      if [ -n "${STACK_PROVISION_LOG_FILE:-}" ]; then
        printf '%s\n' "STACK_CLOUD_INIT_DONE" >> "$STACK_PROVISION_LOG_FILE"
      fi
      write_marker_to_consoles "STACK_CLOUD_INIT_DONE"

      shutdown -P now

runcmd:
  - [bash, /usr/local/bin/provision-build]