api2: tape: restore: add warning for list restore

if an error occurs, the snapshot dirs will already be created, and we
do not clean them up (some might already be finished).

Warn the user that they are not cleaned up.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

src/api2/tape/restore.rs

@@ -647,6 +647,10 @@ fn restore_list_worker(
         Ok(())
     });
 
+    if res.is_err() {
+        task_warn!(worker, "Error during restore, partially restored snapshots will NOT be cleaned up");
+    }
+
     match std::fs::remove_dir_all(&base_path) {
         Ok(()) => {}
         Err(err) => task_warn!(worker, "error cleaning up: {}", err),