Avoid crashing on startup if DBus isn't running

I am trying to run Dolphin on a minimal FreeBSD CHERI-RISC-V QEMU
instance and I haven't got DBus running. Without this change, I get
crashes because QDBusConnection::sessionBus().interface() returns NULL
if DBus isn't running.

3 files changed, 8 insertions, 4 deletions

diff --git a/src/dbusinterface.cpp b/src/dbusinterface.cpp
index 7e453f72a..2b674b968 100644
--- a/src/dbusinterface.cpp
+++ b/src/dbusinterface.cpp
@@ -20,8 +20,10 @@ DBusInterface::DBusInterface() :
 {
     QDBusConnection::sessionBus().registerObject(QStringLiteral("/org/freedesktop/FileManager1"), this,
             QDBusConnection::ExportScriptableContents | QDBusConnection::ExportAdaptors);
-    QDBusConnection::sessionBus().interface()->registerService(QStringLiteral("org.freedesktop.FileManager1"),
-                                                               QDBusConnectionInterface::QueueService);
+    QDBusConnectionInterface *sessionInterface = QDBusConnection::sessionBus().interface();
+    if (sessionInterface) {
+        sessionInterface->registerService(QStringLiteral("org.freedesktop.FileManager1"), QDBusConnectionInterface::QueueService);
+    }
 }
 
 void DBusInterface::ShowFolders(const QStringList& uriList, const QString& startUpId)
diff --git a/src/dolphinmainwindow.cpp b/src/dolphinmainwindow.cpp
index fe39d4d2f..d4c8199a6 100644
--- a/src/dolphinmainwindow.cpp
+++ b/src/dolphinmainwindow.cpp
@@ -1543,7 +1543,8 @@ void DolphinMainWindow::setupActions()
     stashSplit->setToolTip(i18nc("@info", "Opens the stash virtual directory in a split window"));
     stashSplit->setIcon(QIcon::fromTheme(QStringLiteral("folder-stash")));
     stashSplit->setCheckable(false);
-    stashSplit->setVisible(QDBusConnection::sessionBus().interface()->isServiceRegistered(QStringLiteral("org.kde.kio.StashNotifier")));
+    QDBusConnectionInterface *sessionInterface = QDBusConnection::sessionBus().interface();
+    stashSplit->setVisible(sessionInterface && sessionInterface->isServiceRegistered(QStringLiteral("org.kde.kio.StashNotifier")));
     connect(stashSplit, &QAction::triggered, this, &DolphinMainWindow::toggleSplitStash);
 
     KStandardAction::redisplay(this, &DolphinMainWindow::reloadView, actionCollection());
diff --git a/src/global.cpp b/src/global.cpp
index 197d6ec28..d217a67ec 100644
--- a/src/global.cpp
+++ b/src/global.cpp
@@ -120,7 +120,8 @@ QVector<QPair<QSharedPointer<OrgKdeDolphinMainWindowInterface>, QStringList>> Do
     }
 
     // Look for dolphin instances among all available dbus services.
-    const QStringList dbusServices = QDBusConnection::sessionBus().interface()->registeredServiceNames().value();
+    QDBusConnectionInterface *sessionInterface = QDBusConnection::sessionBus().interface();
+    const QStringList dbusServices = sessionInterface ? sessionInterface->registeredServiceNames().value() : QStringList();
     // Don't match the service without trailing "-" (unique instance)
     const QString pattern = QStringLiteral("org.kde.dolphin-");
     // Don't match the pid without leading "-"