Do not allow the second instance of Partition Manager.

BUG: 365882

CMakeLists.txt

@@ -57,6 +57,7 @@ find_package(KF5 ${KF5_MIN_VERSION} REQUIRED
     ConfigWidgets
     CoreAddons
     Crash
+    DBusAddons
     I18n
     IconThemes
     JobWidgets

src/CMakeLists.txt

@@ -44,6 +44,7 @@ target_link_libraries(partitionmanager ${BLKID_LIBRARIES}
 	KF5::ConfigWidgets
 	KF5::CoreAddons
 	KF5::Crash
+	KF5::DBusAddons
 	KF5::I18n
 	KF5::IconThemes
 	KF5::JobWidgets

src/main.cpp

@@ -28,6 +28,7 @@
 
 #include <KAboutData>
 #include <KCrash>
+#include <KDBusService>
 #include <Kdelibs4ConfigMigrator>
 #include <KMessageBox>
 #include <KLocalizedString>
@@ -73,6 +74,8 @@ int Q_DECL_IMPORT main(int argc, char* argv[])
     parser.process(app);
     aboutData.processCommandLine(&parser);
 
+    KDBusService service(KDBusService::Unique);
+
     registerMetaTypes();
 
     Config::instance(QStringLiteral("partitionmanagerrc"));