diff -up kdelibs-4.7.80/plasma/CMakeLists.txt.libplasma-pk-0001 kdelibs-4.7.80/plasma/CMakeLists.txt

--- kdelibs-4.7.80/plasma/CMakeLists.txt.libplasma-pk-0001	2011-11-17 21:54:56.000000000 +0100

+++ kdelibs-4.7.80/plasma/CMakeLists.txt	2011-11-18 13:16:23.243039344 +0100

@@ -6,10 +6,15 @@ if(KDE_PLATFORM_FEATURE_BINARY_COMPATIBL

     set(PLASMA_NO_KNEWSTUFF TRUE)

     set(PLASMA_NO_SOLID TRUE)

     set(PLASMA_NO_KIO TRUE)

+    set(PLASMA_NO_PACKAGEKIT TRUE)

     set(PLASMA_NO_KUTILS TRUE)

     set(PLASMA_NO_GLOBAL_SHORTCUTS TRUE)

 endif(KDE_PLATFORM_FEATURE_BINARY_COMPATIBLE_FEATURE_REDUCTION)

+if(NOT Q_WS_X11)

+    set(PLASMA_NO_PACKAGEKIT TRUE)

+endif(NOT Q_WS_X11)

+

 include_directories(${CMAKE_CURRENT_SOURCE_DIR}

                     ${KDE4_KDECORE_INCLUDES}

                     ${KDE4_KDEUI_INCLUDES}

@@ -44,6 +49,11 @@ if(NOT PLASMA_NO_SOLID)

     set(PLASMA_EXTRA_LIBS ${PLASMA_EXTRA_LIBS} ${KDE4_SOLID_LIBS})

 endif(NOT PLASMA_NO_SOLID)

+if(NOT PLASMA_NO_PACKAGEKIT)

+    add_definitions(-DPLASMA_ENABLE_PACKAGEKIT_SUPPORT=1)

+    set(PLASMA_EXTRA_LIBS ${PLASMA_EXTRA_LIBS} ${QT_QTDBUS_LIBRARY})

+endif(NOT PLASMA_NO_PACKAGEKIT)

+

 if (NOT PLASMA_NO_KUTILS)

     include_directories(${CMAKE_SOURCE_DIR}/kutils)

     set(PLASMA_EXTRA_LIBS ${PLASMA_EXTRA_LIBS} ${KDE4_KUTILS_LIBS})

@@ -117,6 +127,7 @@ set(plasma_LIB_SRCS

     private/animablegraphicswebview.cpp

     private/applethandle.cpp

     private/associatedapplicationmanager.cpp

+    private/componentinstaller.cpp

     private/datacontainer_p.cpp

     private/dataenginebindings.cpp

     private/dataengineconsumer.cpp

diff -up kdelibs-4.7.80/plasma/dataenginemanager.cpp.libplasma-pk-0001 kdelibs-4.7.80/plasma/dataenginemanager.cpp

--- kdelibs-4.7.80/plasma/dataenginemanager.cpp.libplasma-pk-0001	2011-08-22 15:13:55.000000000 +0200

+++ kdelibs-4.7.80/plasma/dataenginemanager.cpp	2011-11-18 12:48:37.513008572 +0100

@@ -29,6 +29,7 @@

 #include "datacontainer.h"

 #include "pluginloader.h"

+#include "private/componentinstaller_p.h"

 #include "private/dataengine_p.h"

 #include "private/datacontainer_p.h"

 #include "scripting/scriptengine.h"

@@ -130,6 +131,9 @@ Plasma::DataEngine *DataEngineManager::l

     DataEngine *engine = PluginLoader::pluginLoader()->loadDataEngine(name);

     if (!engine) {

+        // Try installing the engine. However, it's too late for this request.

+        ComponentInstaller::self()->installMissingComponent("dataengine", name);

+

         return d->nullEngine();

     }

diff -up kdelibs-4.7.80/plasma/private/componentinstaller.cpp.libplasma-pk-0001 kdelibs-4.7.80/plasma/private/componentinstaller.cpp

--- kdelibs-4.7.80/plasma/private/componentinstaller.cpp.libplasma-pk-0001	2011-11-18 12:48:37.513008572 +0100

+++ kdelibs-4.7.80/plasma/private/componentinstaller.cpp	2011-11-18 12:48:37.513008572 +0100

@@ -0,0 +1,103 @@

+/*

+ *   Copyright 2011 Kevin Kofler <kevin.kofler@chello.at>

+ *

+ *   This program is free software; you can redistribute it and/or modify

+ *   it under the terms of the GNU Library General Public License as

+ *   published by the Free Software Foundation; either version 2, or

+ *   (at your option) any later version.

+ *

+ *   This program is distributed in the hope that it will be useful,

+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of

+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ *   GNU General Public License for more details

+ *

+ *   You should have received a copy of the GNU Library General Public

+ *   License along with this program; if not, write to the

+ *   Free Software Foundation, Inc.,

+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

+ */

+

+#include "private/componentinstaller_p.h"

+

+#include <kglobal.h>

+

+#ifdef PLASMA_ENABLE_PACKAGEKIT_SUPPORT

+#include <QSet>

+#include <QDBusInterface>

+#include <QDBusPendingCall>

+#include <QWidget>

+#include <QLatin1String>

+#include <QStringList>

+#endif

+

+namespace Plasma

+{

+

+class ComponentInstallerPrivate

+{

+    public:

+#ifdef PLASMA_ENABLE_PACKAGEKIT_SUPPORT

+        QSet<QString> alreadyPrompted;

+#endif

+};

+

+class ComponentInstallerSingleton

+{

+    public:

+        ComponentInstaller self;

+};

+

+K_GLOBAL_STATIC(ComponentInstallerSingleton, privateComponentInstallerSelf)

+

+ComponentInstaller *ComponentInstaller::self()

+{

+    return &privateComponentInstallerSelf->self;

+}

+

+ComponentInstaller::ComponentInstaller()

+    : d(new ComponentInstallerPrivate)

+{

+}

+

+ComponentInstaller::~ComponentInstaller()

+{

+    delete d;

+}

+

+void ComponentInstaller::installMissingComponent(const QString &type,

+                                                 const QString &name,

+                                                 QWidget *parent, bool force)

+{

+#ifdef PLASMA_ENABLE_PACKAGEKIT_SUPPORT

+    QString searchString = type + '-' + name;

+

+    if (!force) {

+        if (d->alreadyPrompted.contains(searchString)) {

+            return;

+        }

+    }

+

+    d->alreadyPrompted.insert(searchString);

+

+    QDBusInterface packageKit(QLatin1String("org.freedesktop.PackageKit"),

+                              QLatin1String("/org/freedesktop/PackageKit"),

+                              QLatin1String("org.freedesktop.PackageKit.Modify"));

+    // We don't check packageKit.isValid() because the service is activated on

+    // demand, so it will show up as "not valid".

+    WId wid = 0;

+    if (parent) {

+        wid = parent->winId();

+    }

+    QStringList resources;

+    resources.append(searchString);

+    packageKit.asyncCall(QLatin1String("InstallResources"), (unsigned int) wid,

+                         QLatin1String("plasma-service"), resources, QString());

+#else

+    Q_UNUSED(type);

+    Q_UNUSED(name);

+    Q_UNUSED(parent);

+    Q_UNUSED(force);

+#endif

+}

+

+} // namespace Plasma

diff -up kdelibs-4.7.80/plasma/private/componentinstaller_p.h.libplasma-pk-0001 kdelibs-4.7.80/plasma/private/componentinstaller_p.h

--- kdelibs-4.7.80/plasma/private/componentinstaller_p.h.libplasma-pk-0001	2011-11-18 12:48:37.514008574 +0100

+++ kdelibs-4.7.80/plasma/private/componentinstaller_p.h	2011-11-18 12:48:37.514008574 +0100

@@ -0,0 +1,94 @@

+/*

+ *   Copyright 2011 Kevin Kofler <kevin.kofler@chello.at>

+ *

+ *   This program is free software; you can redistribute it and/or modify

+ *   it under the terms of the GNU Library General Public License as

+ *   published by the Free Software Foundation; either version 2, or

+ *   (at your option) any later version.

+ *

+ *   This program is distributed in the hope that it will be useful,

+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of

+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ *   GNU General Public License for more details

+ *

+ *   You should have received a copy of the GNU Library General Public

+ *   License along with this program; if not, write to the

+ *   Free Software Foundation, Inc.,

+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

+ */

+

+#ifndef PLASMA_COMPONENTINSTALLER_H

+#define PLASMA_COMPONENTINSTALLER_H

+

+class QString;

+class QWidget;

+

+namespace Plasma

+{

+

+class ComponentInstallerPrivate;

+

+/**

+ * @class ComponentInstaller plasma/private/componentinstaller_p.h

+ *

+ * @short This class provides a generic API for installation of components.

+ *

+ * @internal

+ *

+ * Plasma::ComponentInstaller allows searching for a missing data or script

+ * engine by name, and allowing the user to install the missing service.

+ * Currently, PackageKit is supported as the mechanism to install components,

+ * but more mechanisms could be supported in the future through the same API.

+ *

+ * @since 4.8

+ */

+class ComponentInstaller

+{

+    public:

+        /**

+         * Singleton pattern accessor.

+         */

+        static ComponentInstaller *self();

+

+        /**

+         * Installs a missing component asynchronously.

+         *

+         * By default, this method will cache requested components and not

+         * prompt again for the same engine in the same session. The force

+         * parameter can be used to disable this mechanism, e.g. when the user

+         * just installed a new widget written in a scripting language, and so

+         * is likely to want the script engine installed after all.

+         *

+         * In the case of on-demand installation, this will unfortunately not

+         * allow the call which triggered the missing component lookup to

+         * succeed, but we cannot afford to block all of Plasma until the

+         * mechanism is done installing the service.

+         *

+         * This function does nothing if PackageKit integration was disabled at

+         * compile time.

+         *

+         * @param type the type of the component, should be "scriptengine" or

+         *             "dataengine"

+         * @param name the name of the component

+         * @param parent a parent widget, used to set the wid for PackageKit

+         * @param force whether to always prompt, even if recently prompted

+         */

+        void installMissingComponent(const QString &type, const QString &name,

+                                     QWidget *parent = 0, bool force = false);

+

+    private:

+        /**

+         * Default constructor. The singleton method self() is the

+         * preferred access mechanism.

+         */

+        ComponentInstaller();

+        ~ComponentInstaller();

+

+        ComponentInstallerPrivate *const d;

+

+        friend class ComponentInstallerSingleton;

+};

+

+} // namespace Plasma

+

+#endif // multiple inclusion guard

diff -up kdelibs-4.7.80/plasma/scripting/scriptengine.cpp.libplasma-pk-0001 kdelibs-4.7.80/plasma/scripting/scriptengine.cpp

--- kdelibs-4.7.80/plasma/scripting/scriptengine.cpp.libplasma-pk-0001	2011-09-26 11:41:11.000000000 +0200

+++ kdelibs-4.7.80/plasma/scripting/scriptengine.cpp	2011-11-18 12:48:37.514008574 +0100

@@ -27,6 +27,7 @@

 #include "applet.h"

 #include "dataengine.h"

 #include "package.h"

+#include "private/componentinstaller_p.h"

 #include "scripting/appletscript.h"

 #include "scripting/dataenginescript.h"

 #include "scripting/runnerscript.h"

@@ -196,6 +197,9 @@ ScriptEngine *loadEngine(const QString &

                  << "! error reported: " << error;

     }

+    // Try installing the engine. However, it's too late for this request.

+    ComponentInstaller::self()->installMissingComponent("scriptengine", language);

+

     return 0;

 }