#!/bin/bash
# CI 公共步骤：确保宿主机持久 buildx builder 存在（DooD 模式下所有 job 共享）
# - builder 名固定: ci-builder-persist
# - docker-container driver, host 网络
# - 层缓存保存在 buildkit 容器及其 _state 命名卷中，job 结束不清理
# - 宿主机 ci-docker-cleanup.sh 已豁免该 builder
# 用法: bash scripts/ci/ensure_persistent_builder.sh
set -eu

BUILDER="ci-builder-persist"

if ! docker buildx inspect "$BUILDER" >/dev/null 2>&1; then
  echo "=== 创建持久 buildx builder: $BUILDER ==="
  # 并发安全：matrix 多个 job 可能同时检测到 builder 不存在，只有一个 create 成功；
  # 其余 job 的 create 会因 "builder already exists" 失败（set -e 下会退出）。
  # 用 create || inspect 兜底：create 失败时若 builder 实际已被别的 job 创建，直接复用。
  if ! docker buildx create --name "$BUILDER" --driver docker-container \
      --driver-opt network=host \
      --buildkitd-flags "--allow-insecure-entitlement network.host" \
      --platform linux/amd64 2>/tmp/_buildx_create.err; then
    if docker buildx inspect "$BUILDER" >/dev/null 2>&1; then
      echo "=== builder 已被并发任务创建，复用: $BUILDER ==="
    else
      echo "❌ builder 创建失败且不存在:"
      cat /tmp/_buildx_create.err
      exit 1
    fi
  fi
else
  echo "=== 复用持久 buildx builder: $BUILDER ==="
fi

docker buildx use "$BUILDER"
docker buildx inspect "$BUILDER" --bootstrap
echo "✅ builder ready"
docker buildx ls | head -5