Unify qubes-os XDG config directory

fixes: QubesOS/qubes-issues#8694
Removing space and upper-case letters from qubes-manager configuration
directory. Migrating old config to new unified config directory.

qubesmanager/qube_manager.py

@@ -27,14 +27,18 @@
 from datetime import datetime, timedelta
 from functools import partial
 from os import path
+import xdg.BaseDirectory
+import pathlib
+import shutil
 
 from qubesadmin import exc
 from qubesadmin import utils
 from qubesadmin.tools import qvm_start
 
 # pylint: disable=import-error
 from PyQt5.QtCore import (Qt, QAbstractTableModel, QObject, pyqtSlot, QEvent,
-    QSettings, QRegExp, QSortFilterProxyModel, QSize, QPoint, QTimer)
+    QSettings, QRegExp, QSortFilterProxyModel, QSize, QPoint, QTimer,
+    QCoreApplication)
 
 # pylint: disable=import-error
 from PyQt5.QtWidgets import (QLineEdit, QStyledItemDelegate, QToolTip,
@@ -718,6 +722,21 @@ def __init__(self, qt_app, qubes_app, dispatcher, _parent=None):
         super().__init__()
         self.setupUi(self)
 
+        # migrate old config file to the unified config directory
+        # TODO: Remove this block when Qubes R4.3 becomes End-of-Life
+        old_config_home = xdg.BaseDirectory.xdg_config_home + \
+            '/The Qubes Project'
+        new_config_home = xdg.BaseDirectory.xdg_config_home + '/qubes-os'
+        config_file = 'qubes-qube-manager.conf'
+        old_config_file = old_config_home + '/' + config_file
+        new_config_file = new_config_home + '/' + config_file
+        if path.isfile(old_config_file) and not path.isfile(new_config_file):
+            pathlib.Path(new_config_home).mkdir(parents=True, exist_ok=True)
+            shutil.copy(old_config_file, new_config_file)
+
+        QCoreApplication.setOrganizationName('qubes-os')
+        QCoreApplication.setOrganizationDomain('qubes-os.org')
+        QCoreApplication.setApplicationName('qubes-qube-manager')
         self.manager_settings = QSettings(self)
 
         self.qubes_app = qubes_app