[partition] Add helper for running a KPMCore operation

Most *partition* module jobs run an operation and turn that into
a JobResult -- ok if it succeeds, and with the report text otherwise.
Factor it out into a separate method that can be used as shorthand.

src/modules/partition/core/KPMHelpers.cpp

@@ -127,4 +127,19 @@ clonePartition( Device* device, Partition* partition )
                           partition->activeFlags() );
 }
 
+Calamares::JobResult
+execute( Operation& operation, const QString& failureMessage )
+{
+    operation.setStatus( Operation::StatusRunning );
+
+    Report report( nullptr );
+    if ( operation.execute( report ) )
+    {
+        return Calamares::JobResult::ok();
+    }
+
+    return Calamares::JobResult::error( failureMessage, report.toText() );
+}
+
+
 }  // namespace KPMHelpers

src/modules/partition/core/KPMHelpers.h

@@ -11,11 +11,13 @@
 #ifndef KPMHELPERS_H
 #define KPMHELPERS_H
 
-// KPMcore
+#include "Job.h"
+
 #include <kpmcore/core/partitiontable.h>
 #include <kpmcore/fs/filesystem.h>
+#include <kpmcore/ops/operation.h>
+#include <kpmcore/util/report.h>
 
-// Qt
 #include <QList>
 
 #include <functional>
@@ -72,6 +74,14 @@ Partition* createNewEncryptedPartition( PartitionNode* parent,
 
 Partition* clonePartition( Device* device, Partition* partition );
 
+/** @brief Return a result for an @p operation
+ *
+ * Executes the operation, and if successful, returns a success result.
+ * Otherwise returns an error using @p failureMessage as the primary part
+ * of the error, and details obtained from the operation.
+ */
+Calamares::JobResult execute( Operation& operation, const QString& failureMessage );
+
 }  // namespace KPMHelpers
 
 #endif /* KPMHELPERS_H */