fixed cathing of errors in pipeline

ameasure2/src/provisioner/MeasurementProvisioner.cpp

@@ -140,13 +140,22 @@ MPRPipelineResults MeasurementProvisioner::runPipeline ( const MPPipeline & pipe
 		int status = system ( command.c_str ( ) );
 		if ( WEXITSTATUS ( status ) != 0 ) {
-			ifdstream errorIfd ( errorTmpfileFd );
+			 // rewind stderr to read the error message
+			lseek ( 2, SEEK_SET, 0 );
+			ifdstream errfds ( 2 );
+
+			 // read the whole stderr
 			stringstream buffer;
-			buffer << errorIfd.rdbuf ( );
+			buffer << errfds.rdbuf ( );
+
 			pipelineResults.pipelineStatus.exitCode = WEXITSTATUS ( status );
 			pipelineResults.pipelineStatus.errorOrigin = mppcIter->getRawCommand ( );
 			pipelineResults.pipelineStatus.errorValue  = buffer.str ( );
+			 // destroy stderr contents
+			ftruncate ( 2, 0 );
+			lseek ( 2, SEEK_SET, 0 );
+
 			ofdlog << " ERROR!" << endl;
 			break;
 		}