Fix ExportPkg so errors are not lost, and has progress bar for media (#957)

* Fix Export Assistant so error messages get correct parent window

* Fix ExportPkg so errors are not lost, and has progress bar for media

Fixes #11457

gramps/gui/plug/export/_exportassistant.py

@@ -586,11 +586,11 @@ class ExportAssistant(ManagedWindow, Gtk.Assistant):
             ix = self.get_selected_format_index()
             config.set('behavior.recent-export-type', ix)
             export_function = self.map_exporters[ix].get_export_function()
-            success = export_function(self.dbstate.db,
+            success = export_function(
-                            filename,
+                self.dbstate.db, filename,
-                            User(error=ErrorDialog, parent=self.uistate.window,
+                User(error=ErrorDialog, parent=self.window,
-                                 callback=self.callback),
+                     callback=self.callback),
-                            self.option_box_instance)
+                self.option_box_instance)
         except:
             #an error not catched in the export_function itself
             success = False

gramps/plugins/export/exportpkg.py

@@ -179,34 +179,35 @@ class PackageWriter:
         #---------------------------------------------------------------
 
         try:
-            archive = tarfile.open(self.filename,'w:gz')
+            with tarfile.open(self.filename, 'w:gz') as archive:
-        except EnvironmentError as msg:
+
+                # Write media files first, since the database may be modified
+                # during the process (i.e. when removing object)
+                handles = self.db.get_media_handles(sort_handles=True)
+                for indx, m_id in enumerate(handles):
+                    self.user.callback(indx * 100 / len(handles))
+                    mobject = self.db.get_media_from_handle(m_id)
+                    filename = media_path_full(self.db, mobject.get_path())
+                    archname = str(mobject.get_path())
+                    if os.path.isfile(filename) and os.access(filename,
+                                                              os.R_OK):
+                        archive.add(filename, archname, filter=fix_mtime)
+
+                # Write XML now
+                with BytesIO() as g:
+                    gfile = XmlWriter(self.db, self.user, 2)
+                    gfile.write_handle(g)
+                    tarinfo = tarfile.TarInfo('data.gramps')
+                    tarinfo.size = len(g.getvalue())
+                    tarinfo.mtime = time.time()
+                    if not win():
+                        tarinfo.uid = os.getuid()
+                        tarinfo.gid = os.getgid()
+                    g.seek(0)
+                    archive.addfile(tarinfo, g)
+
+                return True
+        except (EnvironmentError, OSError) as msg:
             log.warning(str(msg))
             self.user.notify_error(_('Failure writing %s') % self.filename, str(msg))
             return 0
-
-        # Write media files first, since the database may be modified
-        # during the process (i.e. when removing object)
-        for m_id in self.db.get_media_handles(sort_handles=True):
-            mobject = self.db.get_media_from_handle(m_id)
-            filename = media_path_full(self.db, mobject.get_path())
-            archname = str(mobject.get_path())
-            if os.path.isfile(filename) and os.access(filename, os.R_OK):
-                archive.add(filename, archname, filter=fix_mtime)
-
-        # Write XML now
-        g = BytesIO()
-        gfile = XmlWriter(self.db, self.user, 2)
-        gfile.write_handle(g)
-        tarinfo = tarfile.TarInfo('data.gramps')
-        tarinfo.size = len(g.getvalue())
-        tarinfo.mtime = time.time()
-        if not win():
-            tarinfo.uid = os.getuid()
-            tarinfo.gid = os.getgid()
-        g.seek(0)
-        archive.addfile(tarinfo, g)
-        archive.close()
-        g.close()
-
-        return True