Reproduce and fix bug #28

src/modules/partition/CreatePartitionJob.cpp

@@ -83,7 +83,7 @@ CreatePartitionJob::exec()
     backendPartitionTable->commit();
 
     FileSystem& fs = m_partition->fileSystem();
-    if ( fs.type() == FileSystem::Unformatted )
+    if ( fs.type() == FileSystem::Unformatted || fs.type() == FileSystem::Extended )
         return Calamares::JobResult::ok();
 
     if ( !fs.create( report, partitionPath ) )

src/modules/partition/tests/JobTests.cpp

@@ -171,7 +171,7 @@ JobTests::testCreatePartitionExtended()
     m_queue.enqueue( job_ptr( job ) );
 
     partition = firstFreePartition( m_device->partitionTable() );
-    job = newCreatePartitionJob( partition, PartitionRole( PartitionRole::Extended ), FileSystem::Unformatted, 10 * MB);
+    job = newCreatePartitionJob( partition, PartitionRole( PartitionRole::Extended ), FileSystem::Extended, 10 * MB);
     job->updatePreview();
     m_queue.enqueue( job_ptr( job ) );
     Partition* extendedPartition = job->partition();