check that output directory is writable

src/core/tandem_run/tandembatchprocess.cpp

@@ -40,6 +40,13 @@ TandemBatchProcess::TandemBatchProcess(MainWindow * p_main_window, WorkMonitorIn
     _tandem_run_batch = tandem_run_batch;
     _p_monitor = p_monitor;
     _tmp_database_file.setAutoRemove(true);
+
+    //check that output directory is writeable :
+    QFileInfo fi_in_dir(_tandem_run_batch._output_directory);
+    if (fi_in_dir.isDir() && fi_in_dir.isWritable()) {
+    } else {
+        throw pappso::PappsoException(QObject::tr("output directory is not writable. Please check permissions on %1").arg(fi_in_dir.absoluteFilePath()));
+    }
 }
 
 TandemBatchProcess::~TandemBatchProcess() {
@@ -102,10 +109,10 @@ void TandemBatchProcess::run() {
         // dir.path() returns the unique directory path
         throw pappso::PappsoException(QObject::tr("problem creating temporary directory in %1\n").arg(tmp_dir.path()));
     }
-    
+
     TandemParametersFile orig_parameter_file(_tandem_run_batch._preset_file);
     _preset_file = QString("%1/%2").arg(tmp_dir.path()).arg(orig_parameter_file.getFilename());
-    
+
     TandemParametersFile new_parameter_file(_preset_file);
     TandemParameters new_param = orig_parameter_file.getTandemParameters();
     //  <note type="input" label="spectrum, threads">1</note>
@@ -124,8 +131,8 @@ void TandemBatchProcess::run() {
         runOne(mz_file);
         i++;
     }
-    
-    _p_monitor->finished(QObject::tr("%1 X!Tandem job(s) finished").arg(_tandem_run_batch._mz_file_list.size())); 
+
+    _p_monitor->finished(QObject::tr("%1 X!Tandem job(s) finished").arg(_tandem_run_batch._mz_file_list.size()));
     qDebug() << "TandemBatchProcess::run end" ;
 }