From bc8d0da70ffadc11a646b60091daf903a2474225 Mon Sep 17 00:00:00 2001
From: trim21 <i@trim21.me>
Date: Thu, 4 Jun 2026 09:30:19 +0800
Subject: [PATCH] set d.message on hash check failure

Use Download::hash_error_message() to get a descriptive error string when
hash check fails due to I/O error, instead of relying on errno which could
be zero.

Also fix Manager::receive_hashing_changed() where set_hash_failed(true) was
called without setting d.message when catching local_error during hash
check (e.g. 'too many open files').
---
 src/core/download_list.cc | 6 +++++-
 src/core/manager.cc       | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/core/download_list.cc b/src/core/download_list.cc
index 76dbdb65..d208fdf6 100644
--- a/src/core/download_list.cc
+++ b/src/core/download_list.cc
@@ -492,7 +492,11 @@ DownloadList::hash_done(Download* download) {
 
   if (!download->is_hash_checked()) {
     download->set_hash_failed(true);
-    
+
+    auto& msg = download->download()->hash_error_message();
+    if (!msg.empty())
+      download->set_message(msg);
+
     DL_TRIGGER_EVENT(download, "event.download.hash_failed");
     return;
   }
diff --git a/src/core/manager.cc b/src/core/manager.cc
index 66d5dddb..ae853a02 100644
--- a/src/core/manager.cc
+++ b/src/core/manager.cc
@@ -513,6 +513,7 @@ Manager::receive_hashing_changed() {
 
       } else {
         (*itr)->set_hash_failed(true);
+        (*itr)->set_message("Hashing failed: " + std::string(e.what()));
         lt_log_print(torrent::LOG_TORRENT_ERROR, "Hashing failed: %s", e.what());
       }
     }