Avoid crashing if we can't write to zenmap.conf. Fixes #449

zenmap/zenmapGUI/MainWindow.py

@@ -124,6 +124,7 @@ import gtk
 import sys
 import os
 from os.path import split, isfile, join, abspath, exists
+import errno
 
 # Prevent loading PyXML
 import xml
@@ -905,9 +906,23 @@ This scan has not been run yet. Start the scan with the "Scan" button first.'))
                 return True
 
         window = WindowConfig()
-        window.x, window.y = self.get_position()
-        window.width, window.height = self.get_size()
-        window.save_changes()
+        try:
+            window.x, window.y = self.get_position()
+            window.width, window.height = self.get_size()
+            window.save_changes()
+        except IOError as e:
+            if e.errno == errno.EACCES:
+                alert = HIGAlertDialog(
+                        message_format=_("Can't save Zenmap configuration"),
+                        # newline before path to help avoid weird line wrapping
+                        secondary_text=_(
+                            'Permission denied when writing to\n%s'
+                            '\nMake sure the file exists and is writable.'
+                            ) % (Path.user_config_file))
+                alert.run()
+                alert.destroy()
+            else:
+                raise
 
         self.destroy()