[partition] Add a job to handle automount behavior

- while here, nudge CalamaresUtils automount API a little,
  since it doesn't really need an rvalue-ref.

src/libcalamares/partition/AutoMount.cpp

@@ -79,7 +79,7 @@ automountDisable( bool disable )
 
 
 void
-automountRestore( std::shared_ptr< AutoMountInfo >&& t )
+automountRestore( const std::shared_ptr< AutoMountInfo >& t )
 {
     QDBusConnection dbus = QDBusConnection::sessionBus();
     enableSolidAutoMount( dbus, t->wasSolidModuleAutoLoaded );

src/libcalamares/partition/AutoMount.h

@@ -43,7 +43,7 @@ DLLEXPORT std::shared_ptr< AutoMountInfo > automountDisable( bool disable = true
  * Pass the value returned from automountDisable() to restore the
  * previous settings.
  */
-DLLEXPORT void automountRestore( std::shared_ptr< AutoMountInfo >&& t );
+DLLEXPORT void automountRestore( const std::shared_ptr< AutoMountInfo >& t );
 
 }  // namespace Partition
 }  // namespace CalamaresUtils

src/modules/partition/CMakeLists.txt

@@ -79,6 +79,7 @@ if ( KPMcore_FOUND AND Qt5DBus_FOUND AND KF5CoreAddons_FOUND AND KF5Config_FOUND
             gui/ScanningDialog.cpp
             gui/ReplaceWidget.cpp
             gui/VolumeGroupBaseDialog.cpp
+            jobs/AutoMountManagementJob.cpp
             jobs/ClearMountsJob.cpp
             jobs/ClearTempMountsJob.cpp
             jobs/CreatePartitionJob.cpp

src/modules/partition/jobs/AutoMountManagementJob.cpp

@@ -0,0 +1,39 @@
+/* === This file is part of Calamares - <https://calamares.io> ===
+ *
+ *   SPDX-FileCopyrightText: 2021 Adriaan de Groot <groot@kde.org>
+ *   SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   Calamares is Free Software: see the License-Identifier above.
+ *
+ */
+
+#include "AutoMountManagementJob.h"
+
+#include "utils/Logger.h"
+
+AutoMountManagementJob::AutoMountManagementJob( bool disable )
+    : m_disable( disable )
+{
+}
+
+QString
+AutoMountManagementJob::prettyName() const
+{
+    return tr( "Manage auto-mount settings" );
+}
+
+Calamares::JobResult
+AutoMountManagementJob::exec()
+{
+    cDebug() << "this" << Logger::Pointer( this ) << "value" << Logger::Pointer( m_stored.get() );
+    if ( m_stored )
+    {
+        CalamaresUtils::Partition::automountRestore( m_stored );
+        m_stored.reset();
+    }
+    else
+    {
+        m_stored = CalamaresUtils::Partition::automountDisable( m_disable );
+    }
+    return Calamares::JobResult::ok();
+}

src/modules/partition/jobs/AutoMountManagementJob.h

@@ -0,0 +1,42 @@
+/* === This file is part of Calamares - <https://calamares.io> ===
+ *
+ *   SPDX-FileCopyrightText: 2021 Adriaan de Groot <groot@kde.org>
+ *   SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   Calamares is Free Software: see the License-Identifier above.
+ *
+ */
+
+#ifndef PARTITION_AUTOMOUNTMANAGEMENTJOB_H
+#define PARTITION_AUTOMOUNTMANAGEMENTJOB_H
+
+#include "Job.h"
+
+#include "partition/AutoMount.h"
+
+/**
+ * This job sets automounting to a specific value, and when run a
+ * second time, **re**sets to the original value. See the documentation
+ * for CalamaresUtils::Partition::automountDisable() for details.
+ * Use @c true to **disable** automounting.
+ *
+ * Effectively: queue the **same** job twice; the first time it runs
+ * it will set the automount behavior, and the second time it
+ * restores the original.
+ *
+ */
+class AutoMountManagementJob : public Calamares::Job
+{
+    Q_OBJECT
+public:
+    AutoMountManagementJob( bool disable = true );
+
+    QString prettyName() const override;
+    Calamares::JobResult exec() override;
+
+private:
+    bool m_disable;
+    decltype( CalamaresUtils::Partition::automountDisable( true ) ) m_stored;
+};
+
+#endif /* PARTITION_AUTOMOUNTMANAGEMENTJOB_H */