Fix crash on missing sync root

Fixes: #9016

1 files changed, 23 insertions, 10 deletions

diff --git a/src/gui/folder.cpp b/src/gui/folder.cpp
index 98e885056..f4c0cbaa5 100644
--- a/src/gui/folder.cpp
+++ b/src/gui/folder.cpp
@@ -77,7 +77,7 @@ Folder::Folder(const FolderDefinition &definition,
     _syncResult.setStatus(status);
 
     // check if the local path exists
-    checkLocalPath();
+    const auto folderOk = checkLocalPath();
 
     _syncResult.setFolder(_definition.alias);
 
@@ -141,8 +141,10 @@ Folder::Folder(const FolderDefinition &definition,
         saveToSettings();
     }
 
-    // Initialize the vfs plugin
-    startVfs();
+    if (folderOk) {
+        // Initialize the vfs plugin
+        startVfs();
+    }
 }
 
 Folder::~Folder()
@@ -155,7 +157,7 @@ Folder::~Folder()
     _engine.reset();
 }
 
-void Folder::checkLocalPath()
+bool Folder::checkLocalPath()
 {
     const QFileInfo fi(_definition.localPath);
     _canonicalLocalPath = fi.canonicalFilePath();
@@ -173,18 +175,22 @@ void Folder::checkLocalPath()
     if (fi.isDir() && fi.isReadable()) {
         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);
+            error = tr("Local folder %1 does not exist.").arg(_definition.localPath);
         } else if (!fi.isDir()) {
-            _syncResult.appendErrorString(tr("%1 should be a folder but is not.").arg(_definition.localPath));
-            _syncResult.setStatus(SyncResult::SetupError);
+            error = tr("%1 should be a folder but is not.").arg(_definition.localPath);
         } else if (!fi.isReadable()) {
-            _syncResult.appendErrorString(tr("%1 is not readable.").arg(_definition.localPath));
+            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
@@ -283,7 +289,7 @@ bool Folder::syncPaused() const
 
 bool Folder::canSync() const
 {
-    return !syncPaused() && accountState()->isConnected();
+    return !syncPaused() && accountState()->isConnected() && _syncResult.status() != SyncResult::SetupError;
 }
 
 bool Folder::dueToSync() const
@@ -495,6 +501,13 @@ void Folder::startVfs()
     OC_ENFORCE(_vfs);
     OC_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.remotePath = remotePathTrailingSlash();