gui/config: Add symlink synchronization as sync option

This commit reverts the effects of commit
47be8fd.

src/gui/folder.cpp

@@ -1096,6 +1096,7 @@ SyncOptions Folder::initializeSyncOptions() const
     auto newFolderLimit = cfgFile.newBigFolderSizeLimit();
     opt._newBigFolderSizeLimit = newFolderLimit.first ? newFolderLimit.second * 1000LL * 1000LL : -1; // convert from MB to B
     opt._confirmExternalStorage = cfgFile.confirmExternalStorage();
+    opt._synchronizeSymlinks = cfgFile.synchronizeSymlinks();
     opt._moveFilesToTrash = cfgFile.moveToTrash();
     opt._vfs = _vfs;
     opt._parallelNetworkJobs = _accountState->account()->isHttp2Supported() ? 20 : 6;

src/gui/generalsettings.cpp

@@ -191,6 +191,7 @@ GeneralSettings::GeneralSettings(QWidget *parent)
     connect(_ui->existingFolderLimitCheckBox, &QAbstractButton::toggled, this, &GeneralSettings::saveMiscSettings);
     connect(_ui->stopExistingFolderNowBigSyncCheckBox, &QAbstractButton::toggled, this, &GeneralSettings::saveMiscSettings);
     connect(_ui->newExternalStorage, &QAbstractButton::toggled, this, &GeneralSettings::saveMiscSettings);
+    connect(_ui->synchronizeSymlinks, &QAbstractButton::toggled, this, &GeneralSettings::saveMiscSettings);
     connect(_ui->moveFilesToTrashCheckBox, &QAbstractButton::toggled, this, &GeneralSettings::saveMiscSettings);
 
 #ifndef WITH_CRASHREPORTER
@@ -259,6 +260,7 @@ void GeneralSettings::loadMiscSettings()
     _ui->showInExplorerNavigationPaneCheckBox->setChecked(cfgFile.showInExplorerNavigationPane());
     _ui->crashreporterCheckBox->setChecked(cfgFile.crashReporter());
     _ui->newExternalStorage->setChecked(cfgFile.confirmExternalStorage());
+    _ui->synchronizeSymlinks->setChecked(cfgFile.synchronizeSymlinks());
     _ui->monoIconsCheckBox->setChecked(cfgFile.monoIcons());
     _ui->moveFilesToTrashCheckBox->setChecked(cfgFile.moveToTrash());
 
@@ -270,6 +272,7 @@ void GeneralSettings::loadMiscSettings()
     _ui->stopExistingFolderNowBigSyncCheckBox->setEnabled(_ui->existingFolderLimitCheckBox->isChecked());
     _ui->stopExistingFolderNowBigSyncCheckBox->setChecked(_ui->existingFolderLimitCheckBox->isChecked() && cfgFile.stopSyncingExistingFoldersOverLimit());
     _ui->newExternalStorage->setChecked(cfgFile.confirmExternalStorage());
+    _ui->synchronizeSymlinks->setChecked(cfgFile.synchronizeSymlinks());
     _ui->monoIconsCheckBox->setChecked(cfgFile.monoIcons());
 }
 
@@ -447,6 +450,7 @@ void GeneralSettings::saveMiscSettings()
     cfgFile.setMoveToTrash(_ui->moveFilesToTrashCheckBox->isChecked());
     cfgFile.setNewBigFolderSizeLimit(newFolderLimitEnabled, _ui->newFolderLimitSpinBox->value());
     cfgFile.setConfirmExternalStorage(_ui->newExternalStorage->isChecked());
+    cfgFile.setSynchronizeSymlinks(_ui->synchronizeSymlinks->isChecked());
     cfgFile.setNotifyExistingFoldersOverLimit(existingFolderLimitEnabled);
     cfgFile.setStopSyncingExistingFoldersOverLimit(stopSyncingExistingFoldersOverLimit);
 

src/gui/generalsettings.ui

@@ -139,6 +139,17 @@
         </item>
        </layout>
       </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_11">
+        <item>
+         <widget class="QCheckBox" name="synchronizeSymlinks">
+          <property name="text">
+           <string>[experimental] Synchronize symlinks</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
       <item>
        <layout class="QHBoxLayout" name="horizontalLayout">
         <item>

src/libsync/configfile.cpp

@@ -102,6 +102,7 @@ static constexpr char useNewBigFolderSizeLimitC[] = "useNewBigFolderSizeLimit";
 static constexpr char notifyExistingFoldersOverLimitC[] = "notifyExistingFoldersOverLimit";
 static constexpr char stopSyncingExistingFoldersOverLimitC[] = "stopSyncingExistingFoldersOverLimit";
 static constexpr char confirmExternalStorageC[] = "confirmExternalStorage";
+static constexpr char synchronizeSymlinksC[] = "synchronizeSymlinks";
 static constexpr char moveToTrashC[] = "moveToTrash";
 
 static constexpr char certPath[] = "http_certificatePath";
@@ -947,6 +948,12 @@ bool ConfigFile::confirmExternalStorage() const
     return getPolicySetting(QLatin1String(confirmExternalStorageC), fallback).toBool();
 }
 
+bool ConfigFile::synchronizeSymlinks() const
+{
+    const auto fallback = getValue(synchronizeSymlinksC, QString(), false);
+    return getPolicySetting(QLatin1String(synchronizeSymlinksC), fallback).toBool();
+}
+
 bool ConfigFile::useNewBigFolderSizeLimit() const
 {
     const auto fallback = getValue(useNewBigFolderSizeLimitC, QString(), true);
@@ -981,6 +988,11 @@ void ConfigFile::setConfirmExternalStorage(bool isChecked)
     setValue(confirmExternalStorageC, isChecked);
 }
 
+void ConfigFile::setSynchronizeSymlinks(bool isChecked)
+{
+    setValue(synchronizeSymlinksC, isChecked);
+}
+
 bool ConfigFile::moveToTrash() const
 {
     return getValue(moveToTrashC, QString(), false).toBool();

src/libsync/configfile.h

@@ -149,6 +149,9 @@ class OWNCLOUDSYNC_EXPORT ConfigFile
     [[nodiscard]] bool confirmExternalStorage() const;
     void setConfirmExternalStorage(bool);
 
+    [[nodiscard]] bool synchronizeSymlinks() const;
+    void setSynchronizeSymlinks(bool);
+
     /** If we should move the files deleted on the server in the trash  */
     [[nodiscard]] bool moveToTrash() const;
     void setMoveToTrash(bool);

src/libsync/discovery.cpp

@@ -39,35 +39,38 @@ namespace OCC {
 
 Q_LOGGING_CATEGORY(lcDisco, "nextcloud.sync.discovery", QtInfoMsg)
 
-ProcessDirectoryJob::ProcessDirectoryJob(DiscoveryPhase *data, PinState basePinState, qint64 lastSyncTimestamp, QObject *parent)
+ProcessDirectoryJob::ProcessDirectoryJob(DiscoveryPhase *data, PinState basePinState, qint64 lastSyncTimestamp, bool synchronizeSymlinks, QObject *parent)
     : QObject(parent)
     , _lastSyncTimestamp(lastSyncTimestamp)
     , _discoveryData(data)
+    , _synchronizeSymlinks(synchronizeSymlinks)
 {
     qCDebug(lcDisco) << data;
     computePinState(basePinState);
 }
 
-ProcessDirectoryJob::ProcessDirectoryJob(const PathTuple &path, const SyncFileItemPtr &dirItem, QueryMode queryLocal, QueryMode queryServer, qint64 lastSyncTimestamp, ProcessDirectoryJob *parent)
+ProcessDirectoryJob::ProcessDirectoryJob(const PathTuple &path, const SyncFileItemPtr &dirItem, QueryMode queryLocal, QueryMode queryServer, qint64 lastSyncTimestamp, bool synchronizeSymlinks, ProcessDirectoryJob *parent)
     : QObject(parent)
     , _dirItem(dirItem)
     , _lastSyncTimestamp(lastSyncTimestamp)
     , _queryServer(queryServer)
     , _queryLocal(queryLocal)
     , _discoveryData(parent->_discoveryData)
     , _currentFolder(path)
+    , _synchronizeSymlinks(synchronizeSymlinks)
 {
     qCDebug(lcDisco) << path._server << queryServer << path._local << queryLocal << lastSyncTimestamp;
     computePinState(parent->_pinState);
 }
 
-ProcessDirectoryJob::ProcessDirectoryJob(DiscoveryPhase *data, PinState basePinState, const PathTuple &path, const SyncFileItemPtr &dirItem, QueryMode queryLocal, qint64 lastSyncTimestamp, QObject *parent)
+ProcessDirectoryJob::ProcessDirectoryJob(DiscoveryPhase *data, PinState basePinState, const PathTuple &path, const SyncFileItemPtr &dirItem, QueryMode queryLocal, qint64 lastSyncTimestamp, bool synchronizeSymlinks, QObject *parent)
         : QObject(parent)
         , _dirItem(dirItem)
         , _lastSyncTimestamp(lastSyncTimestamp)
         , _queryLocal(queryLocal)
         , _discoveryData(data)
         , _currentFolder(path)
+        , _synchronizeSymlinks(synchronizeSymlinks)
 {
     computePinState(basePinState);
 }
@@ -306,7 +309,9 @@ bool ProcessDirectoryJob::handleExcluded(const QString &path, const Entries &ent
         }
     }
 
-    if (excluded == CSYNC_NOT_EXCLUDED) {
+    bool isSymlink = entries.localEntry.isSymLink || entries.serverEntry.isSymLink;
+    // All not excluded files and additionally all symlinks if symlink synchronization is disabled
+    if (excluded == CSYNC_NOT_EXCLUDED && !(_synchronizeSymlinks && isSymlink)) {
         return false;
     } else if (excluded == CSYNC_FILE_SILENTLY_EXCLUDED || excluded == CSYNC_FILE_EXCLUDE_AND_REMOVE) {
         emit _discoveryData->silentlyExcluded(path);
@@ -326,7 +331,8 @@ bool ProcessDirectoryJob::handleExcluded(const QString &path, const Entries &ent
         return true;
     }
 
-    if (entries.localEntry.isSymLink) {
+    if (entries.localEntry.isSymLink && !_synchronizeSymlinks) {
+        item->_errorString = tr("Symbolic links are not supported in syncing.");
     } else {
         switch (excluded) {
         case CSYNC_NOT_EXCLUDED:
@@ -1649,7 +1655,7 @@ void ProcessDirectoryJob::processFileFinalize(
     }
     if (recurse) {
         auto job = new ProcessDirectoryJob(path, item, recurseQueryLocal, recurseQueryServer,
-            _lastSyncTimestamp, this);
+            _lastSyncTimestamp, _synchronizeSymlinks, this);
         job->setInsideEncryptedTree(isInsideEncryptedTree() || item->isEncrypted());
         if (removed) {
             job->setParent(_discoveryData);
@@ -1693,7 +1699,7 @@ void ProcessDirectoryJob::processBlacklisted(const PathTuple &path, const OCC::L
     qCInfo(lcDisco) << "Discovered (blacklisted) " << item->_file << item->_instruction << item->_direction << item->isDirectory();
 
     if (item->isDirectory() && item->_instruction != CSYNC_INSTRUCTION_IGNORE) {
-        auto job = new ProcessDirectoryJob(path, item, NormalQuery, InBlackList, _lastSyncTimestamp, this);
+        auto job = new ProcessDirectoryJob(path, item, NormalQuery, InBlackList, _lastSyncTimestamp, _synchronizeSymlinks, this);
         connect(job, &ProcessDirectoryJob::finished, this, &ProcessDirectoryJob::subJobFinished);
         _queuedJobs.push_back(job);
     } else {

src/libsync/discovery.h

@@ -101,15 +101,15 @@ class ProcessDirectoryJob : public QObject
      * The base pin state is used if the root dir's pin state can't be retrieved.
      */
     explicit ProcessDirectoryJob(DiscoveryPhase *data, PinState basePinState,
-        qint64 lastSyncTimestamp, QObject *parent);
+        qint64 lastSyncTimestamp, bool synchronizeSymlinks, QObject *parent);
 
     /// For creating subjobs
     explicit ProcessDirectoryJob(const PathTuple &path, const SyncFileItemPtr &dirItem,
-        QueryMode queryLocal, QueryMode queryServer, qint64 lastSyncTimestamp,
+        QueryMode queryLocal, QueryMode queryServer, qint64 lastSyncTimestamp, bool synchronizeSymlinks,
         ProcessDirectoryJob *parent);
 
     explicit ProcessDirectoryJob(DiscoveryPhase *data, PinState basePinState, const PathTuple &path, const SyncFileItemPtr &dirItem,
-        QueryMode queryLocal, qint64 lastSyncTimestamp, QObject *parent);
+        QueryMode queryLocal, qint64 lastSyncTimestamp, bool synchronizeSymlinks, QObject *parent);
 
     void start();
     /** Start up to nbJobs, return the number of job started; emit finished() when done */
@@ -296,6 +296,7 @@ class ProcessDirectoryJob : public QObject
     bool _childIgnored = false; // The directory contains ignored item that would prevent deletion
     PinState _pinState = PinState::Unspecified; // The directory's pin-state, see computePinState()
     bool _isInsideEncryptedTree = false; // this directory is encrypted or is within the tree of directories with root directory encrypted
+    const bool _synchronizeSymlinks = false;
 
 signals:
     void finished();

src/libsync/syncengine.cpp

@@ -715,13 +715,15 @@ void SyncEngine::startSync()
             singleItemDiscoveryOptions().discoveryDirItem,
             localQueryMode,
             _journal->keyValueStoreGetInt("last_sync", 0),
+            _syncOptions._synchronizeSymlinks,
             _discoveryPhase.data()
         );
     } else {
         discoveryJob = new ProcessDirectoryJob(
             _discoveryPhase.data(),
             PinState::AlwaysLocal,
             _journal->keyValueStoreGetInt("last_sync", 0),
+            _syncOptions._synchronizeSymlinks,
             _discoveryPhase.data()
         );
     }

src/libsync/syncoptions.h

@@ -42,6 +42,9 @@ class OWNCLOUDSYNC_EXPORT SyncOptions
     /** If a confirmation should be asked for external storages */
     bool _confirmExternalStorage = false;
 
+    /** If symlinks should be synchronized to the server as symlinks */
+    bool _synchronizeSymlinks = false;
+
     /** If remotely deleted files are needed to move to trash */
     bool _moveFilesToTrash = false;