From eec0726b52c190066bf5e717c7d2ca454d1ea768 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=A2=A8=E9=9B=AA?= <dzx1283@126.com>
Date: Tue, 18 Aug 2026 19:07:18 +0800
Subject: [PATCH] fix(mihomo): restore config when initial start fails

---
 backend/internal/mihomo/service.go | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/backend/internal/mihomo/service.go b/backend/internal/mihomo/service.go
index 777b6c5..fed00df 100644
--- a/backend/internal/mihomo/service.go
+++ b/backend/internal/mihomo/service.go
@@ -30,7 +30,7 @@ func (s *Service) SaveConfig(content string) error {
 
 // ApplyConfig validates and activates a candidate configuration. Before the
 // live file is changed, the current file is copied to <config>.bak. If
-// validation or restart fails, the previous configuration is restored.
+// validation or start/restart fails, the previous configuration is restored.
 func (s *Service) ApplyConfig(content string) error {
 	if s == nil || s.cm == nil { return fmt.Errorf("mihomo service not initialized") }
 	old, readErr := s.cm.ReadConfig()
@@ -45,7 +45,17 @@ func (s *Service) ApplyConfig(content string) error {
 		if readErr == nil { _ = s.cm.SaveConfig(old) }
 		return fmt.Errorf("validate Mihomo configuration: %w", err)
 	}
-	if !wasRunning { return s.pm.Start() }
+	if !wasRunning {
+		if err := s.pm.Start(); err != nil {
+			if readErr == nil {
+				if restoreErr := s.cm.SaveConfig(old); restoreErr != nil {
+					return fmt.Errorf("start Mihomo: %v; restore previous config: %w", err, restoreErr)
+				}
+			}
+			return fmt.Errorf("start Mihomo: %w", err)
+		}
+		return nil
+	}
 	if err := s.pm.Restart(); err != nil {
 		if readErr == nil {
 			if restoreErr := s.cm.SaveConfig(old); restoreErr == nil { _ = s.pm.Restart() }