fix: 正确识别 Agent 安装与审计失败

- 下载脚本失败时立即终止安装并提示 WAF 拦截
- Agent 服务未运行时不再计为安装成功
- 审计列表兼容后端 status 成功失败字段

backend/controller/agent_install.go

@@ -180,6 +180,34 @@ func shellQuote(value string) string {
 	return "'" + strings.ReplaceAll(value, "'", "'\"'\"'") + "'"
 }
 
+// agentInstallCommand 先完整下载脚本再执行，确保 curl 失败能正确传递退出状态。 // Logan.Li
+func agentInstallCommand(serverURL, token string) string {
+	scriptURL := shellQuote(serverURL + "/agent/install.sh")
+	serverArg := shellQuote(serverURL)
+	tokenArg := shellQuote(token)
+	return fmt.Sprintf(
+		`tmp=$(mktemp /tmp/aiops-agent-install.XXXXXX) && trap 'rm -f "$tmp"' EXIT && curl -fsSL -o "$tmp" %s && if [ "$(id -u)" -eq 0 ]; then bash "$tmp" --server %s --token %s; else sudo -n bash "$tmp" --server %s --token %s; fi`,
+		scriptURL, serverArg, tokenArg, serverArg, tokenArg,
+	)
+}
+
+// agentInstallErrorMessage 将常见安装失败转换为可操作的中文提示。 // Logan.Li
+func agentInstallErrorMessage(serverURL, output string) string {
+	lowerOutput := strings.ToLower(output)
+	switch {
+	case strings.Contains(lowerOutput, "403") || strings.Contains(lowerOutput, "forbidden"):
+		return "域名代理或 WAF 拒绝 Agent 下载（HTTP 403），请为 /agent/* 关闭人机验证或加入机器访问白名单"
+	case strings.Contains(lowerOutput, "sudo: a password is required") || strings.Contains(lowerOutput, "需要密码"):
+		return "目标主机 SSH 用户没有免密 sudo 权限，请使用 root 账号或配置 passwordless sudo"
+	case strings.Contains(lowerOutput, "curl") && (strings.Contains(lowerOutput, "not found") || strings.Contains(lowerOutput, "未找到")):
+		return "目标主机未安装 curl"
+	case strings.Contains(lowerOutput, "下载失败") || strings.Contains(lowerOutput, "failed to connect") || strings.Contains(lowerOutput, "connection refused"):
+		return "目标主机无法下载安装脚本，请检查后端地址 " + serverURL + " 是否可达"
+	default:
+		return "Agent 安装命令执行失败"
+	}
+}
+
 // detectAgentVersion SSH 到目标主机读取已安装 Agent 的真实版本号 // Logan.Li
 func detectAgentVersion(client *ssh.Client) string {
 	verOut, _ := runSSHCommand(client, "/usr/local/bin/aiops-agent version 2>/dev/null || /usr/local/bin/aiops-agent -v 2>/dev/null || echo ''")
@@ -298,25 +326,13 @@ func (h *AgentInstallHandler) InstallAgent(c *gin.Context) {
 		token = c.Query("token")
 	}
 
-	// 4. 构造安装命令：root 用户直接 bash，非 root 用 sudo -n（无密码才执行，避免挂死）// Logan.Li
-	installCmd := fmt.Sprintf(
-		`if [ "$(id -u)" -eq 0 ]; then curl -fsSL %s/agent/install.sh | bash -s -- --server %s --token %s; else curl -fsSL %s/agent/install.sh | sudo -n bash -s -- --server %s --token %s; fi`,
-		shellQuote(serverURL), shellQuote(serverURL), shellQuote(token),
-		shellQuote(serverURL), shellQuote(serverURL), shellQuote(token),
-	)
+	// 4. 先下载脚本再执行，curl/WAF 失败时不会被管道末端 bash 的退出码掩盖。 // Logan.Li
+	installCmd := agentInstallCommand(serverURL, token)
 
 	// 5. 执行安装
 	installOut, err := runSSHCommand(client, installCmd)
 	if err != nil {
-		msg := "安装命令执行失败"
-		lowerOut := strings.ToLower(installOut)
-		if strings.Contains(lowerOut, "sudo: a password is required") || strings.Contains(lowerOut, "需要密码") {
-			msg = "目标主机 SSH 用户没有免密 sudo 权限，请使用 root 账号或配置 passwordless sudo"
-		} else if strings.Contains(lowerOut, "curl") && (strings.Contains(lowerOut, "not found") || strings.Contains(lowerOut, "未找到")) {
-			msg = "目标主机未安装 curl"
-		} else if strings.Contains(lowerOut, "下载失败") || strings.Contains(lowerOut, "failed to connect") || strings.Contains(lowerOut, "connection refused") {
-			msg = "目标主机无法下载安装脚本，请检查后端地址 " + serverURL + " 是否可达"
-		}
+		msg := agentInstallErrorMessage(serverURL, installOut)
 		h.recordAgentAudit(ac, "install", resource, resourceID, 0,
 			fmt.Sprintf("server=%s arch=%s", serverURL, arch), installOut, msg)
 		c.JSON(http.StatusOK, model.Response{
@@ -330,6 +346,13 @@ func (h *AgentInstallHandler) InstallAgent(c *gin.Context) {
 	// 5. 验证安装是否成功
 	verifyOut, _ := runSSHCommand(client, "systemctl is-active aiops-agent 2>/dev/null || echo 'not_found'")
 	installed := contains(verifyOut, "active") || contains(verifyOut, "running")
+	if !installed {
+		msg := "安装脚本已执行，但 Agent 服务未运行"
+		h.recordAgentAudit(ac, "install", resource, resourceID, 0,
+			fmt.Sprintf("server=%s arch=%s", serverURL, arch), installOut+"\n"+verifyOut, msg)
+		c.JSON(http.StatusOK, model.Response{Code: 500, Message: msg, Data: gin.H{"output": installOut, "verify": verifyOut}})
+		return
+	}
 
 	var agentVer string
 	if installed {
@@ -384,11 +407,7 @@ func (h *AgentInstallHandler) installOne(server model.Server, serverURL, token s
 
 	// 不强制 server.Status==running：只要 SSH 可达即可安装（DB 状态可能滞后于实际开机状态） // Logan.Li
 
-	installCmd := fmt.Sprintf(
-		`if [ "$(id -u)" -eq 0 ]; then curl -fsSL %s/agent/install.sh | bash -s -- --server %s --token %s; else curl -fsSL %s/agent/install.sh | sudo -n bash -s -- --server %s --token %s; fi`,
-		shellQuote(serverURL), shellQuote(serverURL), shellQuote(token),
-		shellQuote(serverURL), shellQuote(serverURL), shellQuote(token),
-	)
+	installCmd := agentInstallCommand(serverURL, token)
 
 	installOut, err := runSSHCommand(client, installCmd)
 	if err != nil {
@@ -397,6 +416,9 @@ func (h *AgentInstallHandler) installOne(server model.Server, serverURL, token s
 
 	verifyOut, _ := runSSHCommand(client, "systemctl is-active aiops-agent 2>/dev/null || echo 'not_found'")
 	installed := contains(verifyOut, "active") || contains(verifyOut, "running")
+	if !installed {
+		return false, installOut, verifyOut, fmt.Errorf("安装脚本已执行，但 Agent 服务未运行")
+	}
 
 	if installed {
 		// 只更新在线状态；版本号仅在能读到真实版本时才写入，未上报时不写假版本 // Logan.Li
@@ -473,8 +495,13 @@ func (h *AgentInstallHandler) BatchInstallAgent(c *gin.Context) {
 			rid := strconv.Itoa(int(server.ID))
 			reqDetail := fmt.Sprintf("server=%s host=%s", serverURL, res)
 			if err != nil {
-				log.Printf("[BatchInstall] %s (%s) 安装失败: %v", server.Hostname, server.IP, err)
-				h.recordAgentAudit(ac, "install", res, rid, 0, reqDetail, installOut, truncateAuditText(err.Error(), 500))
+				errMessage := agentInstallErrorMessage(serverURL, installOut)
+				if errMessage == "Agent 安装命令执行失败" {
+					errMessage = err.Error()
+				}
+				log.Printf("[BatchInstall] %s (%s) 安装失败: %s", server.Hostname, server.IP, errMessage)
+				respDetail := fmt.Sprintf("=== 安装输出 ===\n%s\n=== 服务状态 ===\n%s", installOut, verifyOut)
+				h.recordAgentAudit(ac, "install", res, rid, 0, reqDetail, respDetail, truncateAuditText(errMessage, 500))
 			} else {
 				successCount++
 				respDetail := fmt.Sprintf("=== 安装输出 ===\n%s\n=== 服务状态 ===\n%s", installOut, verifyOut)