Fetching the flux source is now done through Config.

lib/fluxsource/fluxsource.h

@@ -2,6 +2,7 @@
 #define FLUXSOURCE_H
 
 #include "flags.h"
+#include "lib/config.pb.h"
 
 class A2rFluxSourceProto;
 class CwfFluxSourceProto;
@@ -58,14 +59,34 @@ public:
     static std::unique_ptr<FluxSource> create(const FluxSourceProto& spec);
 
 public:
+	/* Returns any configuration this flux source might be carrying (e.g. tpi
+	 * of the drive which made the capture). */
+
+	const ConfigProto& getConfig() const
+	{ return _fluxConfig; }
+
+	/* Read flux from a given track and side. */
+
     virtual std::unique_ptr<FluxSourceIterator> readFlux(
         int track, int side) = 0;
+
+	/* Recalibrates; seeks to track 0 and ensures the head is in the right place. */
+
     virtual void recalibrate() {}
+
+	/* Seeks to a given track (without recalibrating). */
+
     virtual void seek(int track) {}
+
+	/* Is this real hardware? If so, then flux can be read indefinitely (among other things). */
+
     virtual bool isHardware()
     {
         return false;
     }
+
+protected:
+	ConfigProto _fluxConfig;
 };
 
 class EmptyFluxSourceIterator : public FluxSourceIterator