Detect Python/Node/PM2 on deploy (install only if missing); uninstall removes /opt/eth_hedge_sim.

Keep .env and DB backup under /root/backups before deleting the install directory.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/lib/common.sh

@@ -84,22 +84,128 @@ resolve_repo_root() {
   return 1
 }
 
-ensure_system_deps() {
-  step "检查系统依赖"
+# ---------- 运行时检测（有则跳过，无则安装） ----------
+
+python_runtime_ok() {
+  command -v python3 >/dev/null 2>&1 || return 1
+  # 能创建 venv 即可；pip 在项目 .venv 内安装
+  python3 -c "import venv" >/dev/null 2>&1 || return 1
+  return 0
+}
+
+node_runtime_ok() {
+  command -v node >/dev/null 2>&1 || return 1
+  command -v npm >/dev/null 2>&1 || return 1
+  return 0
+}
+
+pm2_runtime_ok() {
+  command -v pm2 >/dev/null 2>&1
+}
+
+print_runtime_probe() {
+  echo "环境检测:"
+  if python_runtime_ok; then
+    echo "  [OK] Python3 + venv       →  $(python3 --version 2>&1)"
+  else
+    echo "  [缺] Python3 / venv       →  将自动安装"
+  fi
+  if node_runtime_ok; then
+    echo "  [OK] Node.js + npm         →  $(node --version 2>&1) / npm $(npm --version 2>&1)"
+  else
+    echo "  [缺] Node.js / npm         →  将自动安装 Node ${NODE_MAJOR}"
+  fi
+  if pm2_runtime_ok; then
+    echo "  [OK] PM2                   →  $(pm2 -v 2>&1)"
+  else
+    echo "  [缺] PM2                   →  将自动安装"
+  fi
+}
+
+install_python_runtime() {
+  step "安装 Python3 环境 (python3 / venv / pip)"
   export DEBIAN_FRONTEND=noninteractive
-  if command -v apt-get >/dev/null 2>&1; then
-    apt-get update -qq
-    apt-get install -y git ca-certificates curl python3 python3-venv python3-pip
+  if ! command -v apt-get >/dev/null 2>&1; then
+    die "非 apt 系统，请手动安装 python3 python3-venv python3-pip"
   fi
-  if ! command -v node >/dev/null 2>&1; then
-    step "安装 Node.js ${NODE_MAJOR}"
-    curl -fsSL "https://deb.nodesource.com/setup_${NODE_MAJOR}.x" | bash -
-    apt-get install -y nodejs
+  apt-get update -qq
+  apt-get install -y python3 python3-venv python3-pip
+  if ! python_runtime_ok; then
+    die "Python 环境安装后仍不可用，请检查 apt 源"
   fi
-  if ! command -v pm2 >/dev/null 2>&1; then
-    step "安装 PM2"
-    npm install -g pm2
+  log "Python 已就绪: $(python3 --version 2>&1)"
+}
+
+install_node_runtime() {
+  step "安装 Node.js ${NODE_MAJOR}"
+  export DEBIAN_FRONTEND=noninteractive
+  if ! command -v apt-get >/dev/null 2>&1; then
+    die "非 apt 系统，请手动安装 Node.js ${NODE_MAJOR}+"
   fi
+  apt-get update -qq
+  apt-get install -y ca-certificates curl
+  curl -fsSL "https://deb.nodesource.com/setup_${NODE_MAJOR}.x" | bash -
+  apt-get install -y nodejs
+  if ! node_runtime_ok; then
+    die "Node.js 安装后仍不可用"
+  fi
+  log "Node 已就绪: $(node --version 2>&1)"
+}
+
+install_pm2_runtime() {
+  step "安装 PM2"
+  if ! command -v npm >/dev/null 2>&1; then
+    die "安装 PM2 需要先有 npm"
+  fi
+  npm install -g pm2
+  if ! pm2_runtime_ok; then
+    die "PM2 安装后仍不可用"
+  fi
+  log "PM2 已就绪: $(pm2 -v 2>&1)"
+}
+
+ensure_base_packages() {
+  local need=()
+  command -v git >/dev/null 2>&1 || need+=(git)
+  command -v curl >/dev/null 2>&1 || need+=(curl)
+  if [[ ${#need[@]} -eq 0 ]]; then
+    log "基础包 git/curl 已存在，跳过"
+    return 0
+  fi
+  if ! command -v apt-get >/dev/null 2>&1; then
+    die "缺少依赖: ${need[*]}，且无 apt-get"
+  fi
+  step "安装基础包: ${need[*]}"
+  export DEBIAN_FRONTEND=noninteractive
+  apt-get update -qq
+  apt-get install -y ca-certificates "${need[@]}"
+}
+
+ensure_system_deps() {
+  step "环境检测 (Python / Node / PM2)"
+  print_runtime_probe
+  ensure_base_packages
+
+  if python_runtime_ok; then
+    log "Python 环境已存在，跳过安装"
+  else
+    install_python_runtime
+  fi
+
+  if node_runtime_ok; then
+    log "Node.js 环境已存在，跳过安装"
+  else
+    install_node_runtime
+  fi
+
+  if pm2_runtime_ok; then
+    log "PM2 已存在，跳过安装"
+  else
+    install_pm2_runtime
+  fi
+
+  step "环境确认"
+  print_runtime_probe
 }
 
 pm2_stop_project() {