Fix OS Error: Cross-device link, errno = 18

client/lib/utils.dart

@@ -181,18 +181,19 @@ Future<void> download(BuildContext context, SyncItemConfig item, dav.File cloudA
       if (directory.existsSync()) {
         directory.deleteSync(recursive: true);
       }
-      Directory(temp.path);
+      await Directory(temp.path).safeMoveDirectory(item.path);
-      Directory(temp.path).renameSync(item.path);
     case FileSystemEntityType.file:
       var file = File(item.path);
       if (file.existsSync()) {
         file.deleteSync();
       }
-      temp.renameSync(item.path);
+      await temp.safeMoveFile(item.path);
     default:
       print('Failed: $fileSystemEntityType');
   }
 
+  loadLocalStatus();
+
   if (context.mounted) {
     ScaffoldMessenger.of(context).showSnackBar(
       SnackBar(
@@ -211,3 +212,61 @@ extension DateTimeExt on DateTime {
 
   String padZero(int num, [fix = 2]) => num.toString().padLeft(fix, '0');
 }
+
+/// 安全地移动文件和目录（支持跨分区）
+
+extension on File {
+  Future<void> safeMoveFile(String destPath) async {
+    try {
+      await rename(destPath);
+      return;
+    } on FileSystemException catch (e) {
+      // 捕获到 errno = 18 (EXDEV) 跨分区错误时，退化到“复制+删除”方案
+      if (e.osError?.errorCode != 18) {
+        rethrow; // 其他错误继续抛出
+      }
+    }
+
+    await copy(destPath);
+
+    await delete();
+  }
+}
+
+extension on Directory {
+  Future<void> safeMoveDirectory(String destPath) async {
+    // 1. 如果在同一分区，优先尝试 rename，效率最高
+    try {
+      await rename(destPath);
+      return;
+    } on FileSystemException catch (e) {
+      // 捕获到 errno = 18 (EXDEV) 跨分区错误时，退化到“复制+删除”方案
+      if (e.osError?.errorCode != 18) {
+        rethrow; // 其他错误继续抛出
+      }
+    }
+
+    // 2. 跨分区移动：递归复制
+    await _copyDirectory(this, Directory(destPath));
+
+    // 3. 复制完成后删除源目录
+    await delete(recursive: true);
+  }
+}
+
+/// 递归复制目录
+Future<void> _copyDirectory(Directory source, Directory destination) async {
+  // 确保目标目录存在
+  await destination.create(recursive: true);
+
+  await for (var entity in source.list(recursive: false)) {
+    // 计算在新目录下的对应路径
+    final newPath = '${destination.path}/${entity.uri.pathSegments.lastWhere((s) => s.isNotEmpty)}';
+
+    if (entity is File) {
+      await entity.copy(newPath);
+    } else if (entity is Directory) {
+      await _copyDirectory(entity, Directory(newPath));
+    }
+  }
+}