Fix: correctly detects network drive.

src/common/vfs.cpp

@@ -1,4 +1,4 @@
 /*
  * Copyright (C) by Dominik Schmidt <[email protected]>
  *
  * This library is free software; you can redistribute it and/or
@@ -16,7 +16,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "config.h"
 #include "vfs.h"
 #include "plugin.h"
 #include "version.h"
@@ -24,6 +24,7 @@
 
 #include "common/filesystembase.h"
 
+#include <QDir>
 #include <QPluginLoader>
 #include <QLoggingCategory>
 
@@ -65,21 +66,28 @@
     return {};
 }
 
-Result<bool, QString> Vfs::checkAvailability(const QString &path)
+Result<void, QString> Vfs::checkAvailability(const QString &path, Vfs::Mode mode)
 {
-    const auto mode = bestAvailableVfsMode();
 #ifdef Q_OS_WIN
     if (mode == Mode::WindowsCfApi) {
-        const auto fs = FileSystem::fileSystemForPath(path);
+        const auto info = QFileInfo(path);
+        if (QDir(info.canonicalPath()).isRoot()) {
+            return tr("The Virtual filesystem feature does not support a drive as sync root");
+        }
+        const auto fs = FileSystem::fileSystemForPath(info.absoluteFilePath());
         if (fs != QLatin1String("NTFS")) {
             return tr("The Virtual filesystem feature requires a NTFS file system, %1 is using %2").arg(path, fs);
         }
+        const auto type = GetDriveTypeW(reinterpret_cast<const wchar_t *>(QDir::toNativeSeparators(info.absoluteFilePath().mid(0, 3)).utf16()));
+        if (type == DRIVE_REMOTE) {
+            return tr("The Virtual filesystem feature is not supported on network drives");
+        }
     }
 #else
     Q_UNUSED(mode)
     Q_UNUSED(path)
 #endif
-    return true;
+    return {};
 }
 
 void Vfs::start(const VfsSetupParams &params)

src/common/vfs.h

@@ -13,7 +13,7 @@
  */
 #pragma once
 
 #include "ocsynclib.h"
 #include "result.h"
 #include "syncfilestatus.h"
 #include "pinstate.h"
@@ -125,7 +125,7 @@
     static QString modeToString(Mode mode);
     static Optional<Mode> modeFromString(const QString &str);
 
-    static Result<bool, QString> checkAvailability(const QString &path);
+    static Result<void, QString> checkAvailability(const QString &path, OCC::Vfs::Mode mode);
 
     enum class AvailabilityError
     {

src/gui/accountsettings.cpp

@@ -1,4 +1,4 @@
 /*
  * Copyright (C) by Daniel Molkentin <[email protected]>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -710,8 +710,9 @@
         ac->setDisabled(Theme::instance()->enforceVirtualFilesSyncFolder());
     }
 
-    if (Theme::instance()->showVirtualFilesOption() && !folder->virtualFilesEnabled() && Vfs::checkAvailability(folder->path())) {
-        const auto mode = bestAvailableVfsMode();
+    if (const auto mode = bestAvailableVfsMode();
+        Theme::instance()->showVirtualFilesOption()
+        && !folder->virtualFilesEnabled() && Vfs::checkAvailability(folder->path(), mode)) {
         if (mode == Vfs::WindowsCfApi || ConfigFile().showExperimentalOptions()) {
             ac = menu->addAction(tr("Enable virtual file support %1 …").arg(mode == Vfs::WindowsCfApi ? QString() : tr("(experimental)")));
             // TODO: remove when UX decision is made

src/gui/folder.cpp

@@ -13,7 +13,7 @@
  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  * for more details.
  */
 #include "common/syncjournaldb.h"
 #include "config.h"
 
 #include "account.h"
@@ -81,7 +81,7 @@
     _syncResult.setStatus(status);
 
     // check if the local path exists
-    checkLocalPath();
+    const auto folderOk = checkLocalPath();
 
     _syncResult.setFolder(_definition.alias);
 
@@ -155,8 +155,10 @@
         saveToSettings();
     }
 
-    // Initialize the vfs plugin
-    startVfs();
+    if (folderOk) {
+        // Initialize the vfs plugin
+        startVfs();
+    }
 }
 
 Folder::~Folder()
@@ -169,7 +171,7 @@
     _engine.reset();
 }
 
-void Folder::checkLocalPath()
+bool Folder::checkLocalPath()
 {
     const QFileInfo fi(_definition.localPath);
     _canonicalLocalPath = fi.canonicalFilePath();
@@ -187,18 +189,22 @@
     if (FileSystem::isDir(_definition.localPath) && FileSystem::isReadable(_definition.localPath)) {
         qCDebug(lcFolder) << "Checked local path ok";
     } else {
+        QString error;
         // Check directory again
         if (!FileSystem::fileExists(_definition.localPath, fi)) {
-            _syncResult.appendErrorString(tr("Local folder %1 does not exist.").arg(_definition.localPath));
-            _syncResult.setStatus(SyncResult::SetupError);
-        } else if (!FileSystem::isDir(_definition.localPath)) {
-            _syncResult.appendErrorString(tr("%1 should be a folder but is not.").arg(_definition.localPath));
-            _syncResult.setStatus(SyncResult::SetupError);
-        } else if (!FileSystem::isReadable(_definition.localPath)) {
-            _syncResult.appendErrorString(tr("%1 is not readable.").arg(_definition.localPath));
+            error = tr("Local folder %1 does not exist.").arg(_definition.localPath);
+        } else if (!fi.isDir()) {
+            error = tr("%1 should be a folder but is not.").arg(_definition.localPath);
+        } else if (!fi.isReadable()) {
+            error = tr("%1 is not readable.").arg(_definition.localPath);
+        }
+        if (!error.isEmpty()) {
+            _syncResult.appendErrorString(error);
             _syncResult.setStatus(SyncResult::SetupError);
+            return false;
         }
     }
+    return true;
 }
 
 QString Folder::shortGuiRemotePathOrAppName() const
@@ -297,7 +303,7 @@
 
 bool Folder::canSync() const
 {
-    return !syncPaused() && accountState()->isConnected();
+    return !syncPaused() && accountState()->isConnected() && _syncResult.status() != SyncResult::SetupError;
 }
 
 void Folder::setSyncPaused(bool paused)
@@ -507,7 +513,14 @@
     ENFORCE(_vfs);
     ENFORCE(_vfs->mode() == _definition.virtualFilesMode);
 
+    const auto result = Vfs::checkAvailability(path(), _vfs->mode());
+    if (!result) {
+        _syncResult.appendErrorString(result.error());
+        _syncResult.setStatus(SyncResult::SetupError);
+        return;
+    }
+
     VfsSetupParams vfsParams;
     vfsParams.filesystemPath = path();
     vfsParams.displayName = shortGuiRemotePathOrAppName();
     vfsParams.alias = alias();

src/gui/folder.h

@@ -17,7 +17,7 @@
 #ifndef MIRALL_FOLDER_H
 #define MIRALL_FOLDER_H
 
 #include "syncresult.h"
 #include "progressdispatcher.h"
 #include "common/syncjournaldb.h"
 #include "networkjobs.h"
@@ -474,7 +474,7 @@
 
     void showSyncResultPopup();
 
-    void checkLocalPath();
+    bool checkLocalPath();
 
     SyncOptions initializeSyncOptions() const;
 

src/gui/folderman.cpp

@@ -1,4 +1,4 @@
 /*
  * Copyright (C) by Klaas Freitag <[email protected]>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -44,6 +44,12 @@
 constexpr auto settingsFoldersC = "Folders";
 constexpr auto settingsVersionC = "version";
 constexpr auto maxFoldersVersion = 1;
+
+int numberOfSyncJournals(const QString &path)
+{
+    return QDir(path).entryList({ QStringLiteral(".sync_*.db"), QStringLiteral("._sync_*.db") }, QDir::Hidden | QDir::Files).size();
+}
+
 }
 
 namespace OCC {
@@ -1800,6 +1806,9 @@
     Utility::NtfsPermissionLookupRAII ntfs_perm;
 #endif
     const QFileInfo selFile(path);
+    if (numberOfSyncJournals(selFile.filePath()) != 0) {
+        return FolderMan::tr("The folder %1 is used in a folder sync connection!").arg(QDir::toNativeSeparators(selFile.filePath()));
+    }
 
     if (!FileSystem::fileExists(path)) {
         QString parentPath = selFile.dir().path();
@@ -2027,4 +2036,20 @@
     }
 }
 
+bool FolderMan::checkVfsAvailability(const QString &path, Vfs::Mode mode) const
+{
+    return unsupportedConfiguration(path) && Vfs::checkAvailability(path, mode);
+}
+
+Result<void, QString> FolderMan::unsupportedConfiguration(const QString &path) const
+{
+    if (numberOfSyncJournals(path) > 1) {
+        return tr("Multiple accounts are sharing the folder %1.\n"
+                  "This configuration is know to lead to dataloss and is no longer supported.\n"
+                  "Please consider removing this folder from the account and adding it again.")
+            .arg(path);
+    }
+    return {};
+}
+
 } // namespace OCC

src/gui/folderman.h

@@ -16,7 +16,7 @@
 #ifndef FOLDERMAN_H
 #define FOLDERMAN_H
 
 #include <QByteArray>
 #include <QObject>
 #include <QQueue>
 #include <QList>
@@ -231,6 +231,11 @@
     /** removes current user from the share **/
     void leaveShare(const QString &localFile);
 
+    /** Whether or not vfs is supported in the location. */
+    [[nodiscard]] bool checkVfsAvailability(const QString &path, Vfs::Mode mode = bestAvailableVfsMode()) const;
+
+    /** If the folder configuration is no longer supported this will return an error string */
+    [[nodiscard]] Result<void, QString> unsupportedConfiguration(const QString &path) const;
 signals:
     /**
       * signal to indicate a folder has changed its sync state.

src/gui/folderstatusmodel.cpp

@@ -250,8 +250,15 @@ QVariant FolderStatusModel::data(const QModelIndex &index, int role) const
         return (folder->syncResult().hasUnresolvedConflicts())
             ? QStringList(tr("There are unresolved conflicts. Click for details."))
             : QStringList();
-    case FolderStatusDelegate::FolderErrorMsg:
-        return folder->syncResult().errorStrings();
+    case FolderStatusDelegate::FolderErrorMsg: {
+        auto errors = folder->syncResult().errorStrings();
+        const auto legacyError = FolderMan::instance()->unsupportedConfiguration(folder->path());
+        if (!legacyError) {
+            // the error message might contain new lines, the delegate only expect multiple single line values
+            errors.append(legacyError.error().split(QLatin1Char('\n')));
+        }
+        return errors;
+    }
     case FolderStatusDelegate::FolderInfoMsg:
         return folder->virtualFilesEnabled() && folder->vfs().mode() != Vfs::Mode::WindowsCfApi
             ? QStringList(tr("Virtual file support is enabled."))

src/gui/folderwizard.cpp

@@ -620,9 +620,10 @@ void FolderWizardSelectiveSync::initializePage()
 
 bool FolderWizardSelectiveSync::validatePage()
 {
-    const bool useVirtualFiles = _virtualFilesCheckBox && _virtualFilesCheckBox->isChecked();
+    const auto mode = bestAvailableVfsMode();
+    const bool useVirtualFiles = (mode == Vfs::WindowsCfApi) && (_virtualFilesCheckBox && _virtualFilesCheckBox->isChecked());
     if (useVirtualFiles) {
-        const auto availability = Vfs::checkAvailability(wizard()->field(QStringLiteral("sourceFolder")).toString());
+        const auto availability = Vfs::checkAvailability(wizard()->field(QStringLiteral("sourceFolder")).toString(), mode);
         if (!availability) {
             auto msg = new QMessageBox(QMessageBox::Warning, tr("Virtual files are not available for the selected folder"), availability.error(), QMessageBox::Ok, this);
             msg->setAttribute(Qt::WA_DeleteOnClose);

src/gui/wizard/owncloudadvancedsetuppage.cpp

@@ -13,7 +13,7 @@
  * for more details.
  */
 
 #include <QDir>
 #include <QFileDialog>
 #include <QUrl>
 #include <QTimer>
@@ -393,7 +393,7 @@
 bool OwncloudAdvancedSetupPage::validatePage()
 {
     if (useVirtualFileSync()) {
-        const auto availability = Vfs::checkAvailability(localFolder());
+        const auto availability = Vfs::checkAvailability(localFolder(), bestAvailableVfsMode());
         if (!availability) {
             auto msg = new QMessageBox(QMessageBox::Warning, tr("Virtual files are not available for the selected folder"), availability.error(), QMessageBox::Ok, this);
             msg->setAttribute(Qt::WA_DeleteOnClose);

src/libsync/syncengine.cpp

@@ -541,7 +541,7 @@ void SyncEngine::startSync()
 
     _progressInfo->reset();
 
-    if (!QDir(_localPath).exists()) {
+    if (!QFileInfo::exists(_localPath)) {
         _anotherSyncNeeded = DelayedFollowUp;
         // No _tr, it should only occur in non-mirall
         Q_EMIT syncError(QStringLiteral("Unable to find local sync folder."), ErrorCategory::GenericError);

test/testfolderman.cpp

@@ -1,11 +1,11 @@
 /*
  *    This software is in the public domain, furnished "as is", without technical
  *    support, and with no warranty, express or implied, as to its usefulness for
  *    any purpose.
  *
  */
 
 #include <qglobal.h>
 #include <QTemporaryDir>
 #include <QtTest>
 
@@ -288,7 +288,6 @@
             QVERIFY(!folder->isSyncRunning());
         }
 
-
         // those should be allowed
         // QString FolderMan::checkPathValidityForNewFolder(const QString& path, const QUrl &serverUrl, bool forNewDirectory).second
 
@@ -311,15 +310,15 @@
         QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath + "/sub/ownCloud1", url2).second.isNull());
         QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath + "/ownCloud2/", url2).second.isNull());
 
-        // Now it will work because the account is different
+        // The following both fail because they are already sync folders even if for another account
         QUrl url3("http://anotherexample.org");
         url3.setUserName("dummy");
-        QCOMPARE(folderman->checkPathValidityForNewFolder(dirPath + "/sub/ownCloud1", url3).second, QString());
-        QCOMPARE(folderman->checkPathValidityForNewFolder(dirPath + "/ownCloud2/", url3).second, QString());
+        QCOMPARE(folderman->checkPathValidityForNewFolder(dirPath + "/sub/ownCloud1", url3).second, QString("The folder %1 is used in a folder sync connection!").arg(QDir::toNativeSeparators(dirPath + "/sub/ownCloud1")));
+        QCOMPARE(folderman->checkPathValidityForNewFolder(dirPath + "/ownCloud2", url3).second, QString("The folder %1 is used in a folder sync connection!").arg(QDir::toNativeSeparators(dirPath + "/ownCloud2")));
 
         QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath).second.isNull());
         QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath + "/sub/ownCloud1/folder").second.isNull());
-        QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath + "/sub/ownCloud1/folder/f").second.isNull());
+        QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath + "/sub/ownCloud1/f").second.isNull());
 
 #ifndef Q_OS_WIN // no links on windows, no permissions
         // make a bunch of links
@@ -338,7 +337,7 @@
         // link 3 points to an existing sync folder. To make it fail, the account must be the same
         QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath + "/link3", url2).second.isNull());
         // while with a different account, this is fine
-        QCOMPARE(folderman->checkPathValidityForNewFolder(dirPath + "/link3", url3).second, QString());
+        QCOMPARE(folderman->checkPathValidityForNewFolder(dirPath + "/link3", url3).second, QString("The folder %1 is used in a folder sync connection!").arg(dirPath + "/link3"));
 
         QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath + "/link4").second.isNull());
         QVERIFY(!folderman->checkPathValidityForNewFolder(dirPath + "/link3/folder").second.isNull());