fix: fast-path hasInternet() via carrier check to avoid nmcli cache delay

Made-with: Cursor

lib/network.js

@@ -1,18 +1,35 @@
 'use strict';
 
 const { execSync } = require('child_process');
+const fs  = require('fs');
 const log = require('./logger');
 
 const AP_SSID_PREFIX = 'ClawBox-';
 const AP_IP          = '10.42.0.1';
 const AP_PASSWORD    = '12345678';
 const AP_IFACE       = process.env.CLAWD_WIFI_IFACE || '';
+const ETH_IFACE      = process.env.CLAWD_ETH_IFACE  || 'eth0';
 const CON_NAME       = 'clawd-hotspot';
 
+/**
+ * 检查有线网卡物理链路是否接通（读 sysfs carrier，无延迟）
+ */
+function hasWiredCarrier() {
+  try {
+    const carrier = fs.readFileSync(`/sys/class/net/${ETH_IFACE}/carrier`, 'utf8').trim();
+    return carrier === '1';
+  } catch (_) {
+    return false;
+  }
+}
+
 /**
  * 检测是否有互联网连接（尝试 DNS 解析 + HTTP 连通性）
  */
 function hasInternet() {
+  // 物理层快检：无 WiFi STA 且有线 carrier=0 → 立即返回 false（nmcli 有缓存，不可信）
+  if (!isWifiStaConnected() && !hasWiredCarrier()) return false;
+
   // 优先用 nmcli 的 connectivity check
   try {
     const out = run('nmcli networking connectivity check').trim();
@@ -208,6 +225,7 @@ function isWifiStaConnected() {
 
 module.exports = {
   hasInternet,
+  hasWiredCarrier,
   hasSavedWifiConnection,
   isWifiStaConnected,
   getWifiIface,