Suspend Plasma removable device automounting.

Before doing operations, we connect to DBus session of the original user
and stop kded module for device automounting.

BUG: 368175

CMakeLists.txt

@@ -47,6 +47,7 @@ ecm_setup_version(${VERSION} VARIABLE_PREFIX KPMCORE
 
 find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
   Core
+  DBus
   Gui
   Widgets
 )

src/CMakeLists.txt

@@ -43,6 +43,7 @@ target_link_libraries( kpmcore
     ${UUID_LIBRARIES}
     ${BLKID_LIBRARIES}
     ${LIBATASMART_LIBRARIES}
+    Qt5::DBus
     KF5::I18n
     KF5::IconThemes
     KF5::KIOCore

src/core/operationrunner.cpp

@@ -17,15 +17,17 @@
  *************************************************************************/
 
 #include "core/operationrunner.h"
-
 #include "core/operationstack.h"
-
 #include "ops/operation.h"
-
 #include "util/report.h"
 
+#include <QDBusInterface>
+#include <QDBusReply>
 #include <QMutex>
 
+#include <pwd.h>
+#include <unistd.h>
+
 /** Constructs an OperationRunner.
     @param ostack the OperationStack to act on
 */
@@ -47,6 +49,22 @@ void OperationRunner::run()
 
     bool status = true;
 
+    // Disable Plasma removable device automounting
+    unsigned int currentUid = getuid(); // 0 if running as root
+    unsigned int userId = getpwnam(getlogin())->pw_uid; // uid of original user before sudo
+    setuid(userId);
+    QStringList modules;
+    QDBusConnection bus = QDBusConnection::connectToBus(QDBusConnection::SessionBus, QStringLiteral("sessionBus"));
+    QDBusInterface kdedInterface( QStringLiteral("org.kde.kded5"), QStringLiteral("/kded"), QStringLiteral("org.kde.kded5"), bus );
+    QDBusReply<QStringList> reply = kdedInterface.call( QStringLiteral("loadedModules")  );
+    if ( reply.isValid() )
+        modules = reply.value();
+    QString automounterService = QStringLiteral("device_automounter");
+    bool automounter = modules.contains(automounterService);
+    if (automounter)
+        kdedInterface.call( QStringLiteral("unloadModule"), automounterService );
+    setuid(currentUid);
+
     for (int i = 0; i < numOperations(); i++) {
         suspendMutex().lock();
 
@@ -77,6 +95,9 @@ void OperationRunner::run()
         msleep(5);
     }
 
+    if (automounter)
+        kdedInterface.call( QStringLiteral("loadModule"), automounterService );
+
     if (!status)
         emit error();
     else if (isCancelling())