Don't remove torrent contents parent folder, even it is empty. Closes #2244.

src/core/bittorrent/session.cpp

@@ -813,11 +813,11 @@ bool Session::deleteTorrent(const QString &hash, bool deleteLocalFiles)
 
     // Remove it from session
     if (deleteLocalFiles) {
-        QDir saveDir(torrent->actualSavePath());
-        if ((saveDir != QDir(m_defaultSavePath)) && (saveDir != QDir(m_tempPath))) {
-            m_savePathsToRemove[torrent->hash()] = saveDir.absolutePath();
-            qDebug() << "Save path to remove (async): " << saveDir.absolutePath();
-        }
+        QString tmp = torrent->filePath(0);
+        tmp.truncate(tmp.indexOf("/"));  // get the torrent root directory name
+        if (!tmp.isEmpty())
+            m_savePathsToRemove[torrent->hash()] = torrent->actualSavePath() + tmp;
+
         m_nativeSession->remove_torrent(torrent->nativeHandle(), libt::session::delete_files);
     }
     else {
@@ -2049,7 +2049,6 @@ void Session::handleAlert(libt::alert *a)
             handleMetadataReceivedAlert(static_cast<libt::metadata_received_alert*>(a));
             dispatchTorrentAlert(a);
             break;
-
         case libt::state_update_alert::alert_type:
             handleStateUpdateAlert(static_cast<libt::state_update_alert*>(a));
             break;
@@ -2065,6 +2064,9 @@ void Session::handleAlert(libt::alert *a)
         case libt::torrent_deleted_alert::alert_type:
             handleTorrentDeletedAlert(static_cast<libt::torrent_deleted_alert*>(a));
             break;
+        case libt::torrent_delete_failed_alert::alert_type:
+            handleTorrentDeleteFailedAlert(static_cast<libt::torrent_delete_failed_alert*>(a));
+            break;
         case libt::portmap_error_alert::alert_type:
             handlePortmapWarningAlert(static_cast<libt::portmap_error_alert*>(a));
             break;
@@ -2178,13 +2180,16 @@ void Session::handleTorrentRemovedAlert(libtorrent::torrent_removed_alert *p)
 
 void Session::handleTorrentDeletedAlert(libt::torrent_deleted_alert *p)
 {
+    m_savePathsToRemove.remove(p->info_hash);
+}
+
+void Session::handleTorrentDeleteFailedAlert(libt::torrent_delete_failed_alert *p)
+{
+    // libtorrent won't delete the directory if it contains files not listed in the torrent,
+    // so we remove the directory ourselves
     if (m_savePathsToRemove.contains(p->info_hash)) {
-        qDebug("A torrent was deleted from the hard disk, attempting to remove the root folder too...");
-        const QString dirpath = m_savePathsToRemove.take(p->info_hash);
-        qDebug() << "Removing save path: " << dirpath << "...";
-        bool ok = Utils::Fs::smartRemoveEmptyFolderTree(dirpath);
-        Q_UNUSED(ok);
-        qDebug() << "Folder was removed: " << ok;
+        QString path = m_savePathsToRemove.take(p->info_hash);
+        Utils::Fs::smartRemoveEmptyFolderTree(path);
     }
 }
 

src/core/bittorrent/session.h

@@ -61,6 +61,7 @@ namespace libtorrent
     struct torrent_finished_alert;
     struct torrent_removed_alert;
     struct torrent_deleted_alert;
+    struct torrent_delete_failed_alert;
     struct torrent_paused_alert;
     struct torrent_resumed_alert;
     struct save_resume_data_alert;
@@ -305,6 +306,7 @@ namespace BitTorrent
         void handleFileErrorAlert(libtorrent::file_error_alert *p);
         void handleTorrentRemovedAlert(libtorrent::torrent_removed_alert *p);
         void handleTorrentDeletedAlert(libtorrent::torrent_deleted_alert *p);
+        void handleTorrentDeleteFailedAlert(libtorrent::torrent_delete_failed_alert *p);
         void handlePortmapWarningAlert(libtorrent::portmap_error_alert *p);
         void handlePortmapAlert(libtorrent::portmap_alert *p);
         void handlePeerBlockedAlert(libtorrent::peer_blocked_alert *p);

src/core/utils/fs.cpp

@@ -33,6 +33,7 @@
 #include <QFile>
 #include <QFileInfo>
 #include <QSettings>
+#include <QDirIterator>
 #include <QCoreApplication>
 
 #ifdef Q_OS_MAC
@@ -112,57 +113,51 @@ QString Utils::Fs::folderName(const QString& file_path)
 }
 
 /**
- * Remove an empty folder tree.
- *
- * This function will also remove .DS_Store files on Mac OS and
- * Thumbs.db on Windows.
+ * This function will first remove system cache files, e.g. `Thumbs.db`,
+ * `.DS_Store`. Then will try to remove the whole tree if the tree consist
+ * only of folders
  */
-bool Utils::Fs::smartRemoveEmptyFolderTree(const QString& dir_path)
+bool Utils::Fs::smartRemoveEmptyFolderTree(const QString& path)
 {
-    qDebug() << Q_FUNC_INFO << dir_path;
-    if (dir_path.isEmpty())
+    if (!QDir(path).exists())
         return false;
 
-    QDir dir(dir_path);
-    if (!dir.exists())
-        return true;
+    static const QStringList deleteFilesList = {
+        // Windows
+        "Thumbs.db",
+        "desktop.ini",
+        // Linux
+        ".directory",
+        // Mac OS
+        ".DS_Store"
+    };
 
-    // Remove Files created by the OS
-#if defined Q_OS_MAC
-    forceRemove(dir_path + QLatin1String("/.DS_Store"));
-#elif defined Q_OS_WIN
-    forceRemove(dir_path + QLatin1String("/Thumbs.db"));
-#endif
+    // travel from the deepest folder and remove anything unwanted on the way out.
+    QStringList dirList(path + "/");  // get all sub directories paths
+    QDirIterator iter(path, (QDir::AllDirs | QDir::NoDotAndDotDot), QDirIterator::Subdirectories);
+    while (iter.hasNext())
+        dirList << iter.next() + "/";
+    std::sort(dirList.begin(), dirList.end(), [](const QString &l, const QString &r) { return l.count("/") > r.count("/"); });  // sort descending by directory depth
 
-    QFileInfoList sub_files = dir.entryInfoList();
-    foreach (const QFileInfo& info, sub_files) {
-        QString sub_name = info.fileName();
-        if (sub_name == "." || sub_name == "..")
-            continue;
-
-        QString sub_path = info.absoluteFilePath();
-        qDebug() << Q_FUNC_INFO << "sub file: " << sub_path;
-        if (info.isDir()) {
-            if (!smartRemoveEmptyFolderTree(sub_path)) {
-                qWarning() << Q_FUNC_INFO << "Failed to remove folder: " << sub_path;
-                return false;
-            }
-        }
-        else {
-            if (info.isHidden()) {
-                qDebug() << Q_FUNC_INFO << "Removing hidden file: " << sub_path;
-                if (!forceRemove(sub_path)) {
-                    qWarning() << Q_FUNC_INFO << "Failed to remove " << sub_path;
-                    return false;
-                }
-            }
-            else {
-                qWarning() << Q_FUNC_INFO << "Folder is not empty, aborting. Found: " << sub_path;
+    for (const QString &p : dirList) {
+        // remove unwanted files
+        for (const QString &f : deleteFilesList) {
+            forceRemove(p + f);
         }
+
+        // remove temp files on linux (file ends with '~'), e.g. `filename~`
+        QDir dir(p);
+        QStringList tmpFileList = dir.entryList(QDir::Files);
+        for (const QString &f : tmpFileList) {
+            if (f.endsWith("~"))
+                forceRemove(p + f);
         }
+
+        // remove directory if empty
+        dir.rmdir(p);
     }
-    qDebug() << Q_FUNC_INFO << "Calling rmdir on " << dir_path;
-    return QDir().rmdir(dir_path);
+
+    return QDir(path).exists();
 }
 
 /**

src/core/utils/fs.h

@@ -55,7 +55,8 @@ namespace Utils
         bool sameFileNames(const QString& first, const QString& second);
         QString expandPath(const QString& path);
         QString expandPathAbs(const QString& path);
-        bool smartRemoveEmptyFolderTree(const QString& dir_path);
+
+        bool smartRemoveEmptyFolderTree(const QString& path);
         bool forceRemove(const QString& file_path);
         void removeDirRecursive(const QString& dirName);