added backup file functionallity

1 files changed, 33 insertions, 2 deletions

diff --git a/src/vsession.cpp b/src/vsession.cpp
index 8134bc6..9d3cadb 100644
--- a/src/vsession.cpp
+++ b/src/vsession.cpp
@@ -305,6 +305,10 @@ QList<Session*> VSession::readXmlFile(const QString& filepath) {
 
     QDomDocument doc;
     QFile file(filepath);
+    QString backup_filename = "/tmp/vmchooser2_backup.xml";
+   	QFile backup_file(backup_filename);
+
+
     if (!file.open(QIODevice::ReadOnly)) {
         if (debugMode) {
         	qDebug() << "Cannot read file: " << file.fileName();
@@ -315,9 +319,36 @@ QList<Session*> VSession::readXmlFile(const QString& filepath) {
     	if (debugMode) {
     		qDebug() << "XML file not valid: " << file.fileName();
     	}
-        file.close();
-        return retval;
+
+    	file.close();
+
+    	// try to use backup file
+    	if (!backup_file.open(QIODevice::ReadOnly)) {
+			if (debugMode) {
+				qDebug() << "Cannot read backup file " << backup_filename << " either";
+			}
+			return retval;
+		}
+
+		if (!doc.setContent(&backup_file)) {
+			if (debugMode) {
+				qDebug() << "XML file not valid: " << backup_file.fileName();
+			}
+			backup_file.close();
+			return retval;
+		}
+
+		if (debugMode) {
+			qDebug() << "Used backup file " << backup_filename;
+		}
+
+		backup_file.close();
+    } else {
+    	// file is valid --> create backup file
+		QFile::remove(backup_filename);
+		QFile::copy(filepath, backup_filename);
     }
+
     file.close();
 
     QString dirName(QFileInfo(filepath).dir().absolutePath());