Only allow units to be configured UnitConv knows about

tools/dcdbconfig/sensoraction.cpp

@@ -32,6 +32,7 @@
 #include <cinttypes>
 
 #include <dcdb/sensorconfig.h>
+#include <dcdb/unitconv.h>
 #include "cassandra.h"
 
 #include "sensoraction.h"
@@ -375,7 +376,11 @@ void SensorAction::doUnit(const char* publicName, const char* unit)
 
   switch (err) {
   case DCDB::SC_OK:
-    sensorConfig.setSensorUnit(publicName, unit);
+    if (DCDB::UnitConv::fromString(unit) != DCDB::Unit_None) {
+      sensorConfig.setSensorUnit(publicName, unit);
+    } else {
+      std::cout << "Unknown unit: " << unit << std::endl;
+    }
     break;
   case DCDB::SC_UNKNOWNSENSOR:
     std::cout << "Unknown sensor name: " << publicName << std::endl;