[partition] Use the FailJob to stop installation

- For unsafe installations (compile-time option), make sure
   things fail before partitions are actually written, unless
   the other option is also turned off.

src/modules/partition/core/DeviceList.cpp

@@ -111,6 +111,9 @@ QList< Device* > getDevices( DeviceType which, qint64 minimumSize )
 
 #ifdef DEBUG_PARTITION_UNSAFE
     cWarning() << "Allowing unsafe partitioning choices." << devices.count() << "candidates.";
+#ifdef DEBUG_PARTITION_LAME
+    cDebug() << ".. it has been lamed, and will fail.";
+#endif
 #else
     cDebug() << "Removing unsuitable devices:" << devices.count() << "candidates.";
 

src/modules/partition/core/PartitionCoreModule.cpp

@@ -45,6 +45,9 @@
 #include "jobs/SetPartitionFlagsJob.h"
 #include "utils/CalamaresUtils.h"
 
+#ifdef DEBUG_PARTITION_LAME
+#include "JobExample.h"
+#endif
 #include "Typedefs.h"
 #include "utils/Logger.h"
 
@@ -497,6 +500,17 @@ PartitionCoreModule::jobs() const
     QList< Calamares::job_ptr > lst;
     QList< Device* > devices;
 
+#ifdef DEBUG_PARTITION_UNSAFE
+#ifdef DEBUG_PARTITION_LAME
+    cDebug() << "Unsafe partitioning is enabled.";
+    cDebug() << ".. it has been lamed, and will fail.";
+    lst << Calamares::job_ptr( new Calamares::FailJob( QStringLiteral( "Partition" ) ) );
+#else
+    cWarning() << "Unsafe partitioning is enabled.";
+    cWarning() << ".. the unsafe actions will be executed.";
+#endif
+#endif
+
     lst << Calamares::job_ptr( new ClearTempMountsJob() );
 
     for ( auto info : m_deviceInfos )