Added supply member-variable to catalogue::TapePool

catalogue/TapePool.hpp

@@ -23,6 +23,7 @@
 #include <string>
 
 #include "common/dataStructures/EntryLog.hpp"
+#include "common/optional.hpp"
 
 namespace cta {
 namespace catalogue {
@@ -99,6 +100,11 @@ struct TapePool {
    */
   uint64_t nbPhysicalFiles;
 
+  /**
+   * Optional value used by the tape pool supply mechanism.
+   */
+  cta::optional<std::string> supply;
+
   /**
    * The creation log.
    */