Added getSingleMasterIndex() for command-line tool.

tool/CommandFoeWrite.cpp

@@ -82,7 +82,6 @@ string CommandFoeWrite::helpString() const
 
 void CommandFoeWrite::execute(const StringVector &args)
 {
-	MasterIndexList masterIndices;
     stringstream err;
     ec_ioctl_slave_foe_t data;
     ifstream file;
@@ -94,13 +93,6 @@ void CommandFoeWrite::execute(const StringVector &args)
         throwInvalidUsageException(err);
     }
 
-	masterIndices = getMasterIndices();
-    if (masterIndices.size() != 1) {
-        err << getName() << " requires to select a single master!";
-        throwInvalidUsageException(err);
-    }
-    MasterDevice m(masterIndices.front());
-
     if (args[0] == "-") {
         loadFoeData(&data, cin);
         if (getOutputFile().empty()) {
@@ -128,6 +120,7 @@ void CommandFoeWrite::execute(const StringVector &args)
         }
     }
 
+    MasterDevice m(getSingleMasterIndex());
     try {
         m.open(MasterDevice::ReadWrite);
     } catch (MasterDeviceException &e) {