diff --git a/driveutil/fix-hah/app/_main.py b/driveutil/fix-hah/app/_main.py
index aebc4300..59243822 100644
--- a/driveutil/fix-hah/app/_main.py
+++ b/driveutil/fix-hah/app/_main.py
@@ -3,6 +3,7 @@
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
+from wcpan.drive.core.types import Drive, Node
 from wcpan.drive.cli.lib import create_drive_from_config
 from wcpan.logging import ConfigBuilder
 
@@ -32,11 +33,7 @@ async def main(args: list[str]) -> int:
                 children = (_ for _ in children if _is_hah_name(_.name))
 
                 for child in children:
-                    src_path = await download(drive, child, work_path)
-                    tmp_path = await archive(src_path, work_path)
-                    await upload(drive, tmp_path, node)
-                    await drive.move(child, trashed=True)
-                    print(f"remove {child}")
+                    await _migrate(drive, child, work_path, node)
                     await sleep(60)
     return 0
 
@@ -46,3 +43,11 @@ def _is_hah_name(name: str) -> bool:
 
     rv = re.search(r"\[\d+\]$", name)
     return rv is not None
+
+
+async def _migrate(drive: Drive, src: Node, tmp: Path, parent: Node) -> None:
+    src_path = await download(drive, src, tmp)
+    tmp_path = await archive(src_path, tmp)
+    await upload(drive, tmp_path, parent)
+    await drive.move(src, trashed=True)
+    print(f"remove {src}")