virt-manager: Add --test-options gsettings-keyfile

This will let us test some difficult code paths in the uitests.
Rework the `--test-options first-run` behavior to use a temporary
keyfile rather than the memory backend, to unify the code paths

Signed-off-by: Cole Robinson <crobinso@redhat.com>

virtManager/config.py

@@ -47,16 +47,23 @@ class _SettingsWrapper(object):
     we internally convert it to the settings nested hierarchy. Makes
     client code much smaller.
     """
-    def __init__(self, settings_id):
+    def __init__(self, settings_id, gsettings_keyfile):
         self._root = settings_id
-        self._settings = Gio.Settings.new(self._root)
+
+        if gsettings_keyfile:
+            backend = Gio.keyfile_settings_backend_new(gsettings_keyfile, "/")
+        else:
+            backend = Gio.SettingsBackend.get_default()
+
+        self._settings = Gio.Settings.new_with_backend(self._root, backend)
 
         self._settingsmap = {"": self._settings}
         self._handler_map = {}
 
         for child in self._settings.list_children():
             childschema = self._root + "." + child
-            self._settingsmap[child] = Gio.Settings.new(childschema)
+            self._settingsmap[child] = Gio.Settings.new_with_backend(
+                    childschema, backend)
 
 
     ###################
@@ -189,7 +196,8 @@ class vmmConfig(object):
         self.conf_dir = "/org/virt-manager/%s/" % self.appname
         self.ui_dir = BuildConfig.ui_dir
 
-        self.conf = _SettingsWrapper("org.virt-manager.virt-manager")
+        self.conf = _SettingsWrapper("org.virt-manager.virt-manager",
+                CLITestOptions.gsettings_keyfile)
 
         self.CLITestOptions = CLITestOptions
         if self.CLITestOptions.xmleditor_enabled:

virtManager/virtmanager.py

@@ -200,15 +200,29 @@ class CLITestOptionsClass:
             opts.remove(optname)
             return True
 
+        def _get_value(optname):
+            for opt in opts:
+                if opt.startswith(optname + "="):
+                    opts.remove(opt)
+                    return opt.split("=", 1)[1]
+
         self.first_run = _get("first-run")
         self.leak_debug = _get("leak-debug")
         self.no_events = _get("no-events")
         self.xmleditor_enabled = _get("xmleditor-enabled")
+        self.gsettings_keyfile = _get_value("gsettings-keyfile")
 
         if opts:
             print("Unknown --test-options keys: %s" % opts)
             sys.exit(1)
 
+        if self.first_run and not self.gsettings_keyfile:
+            import atexit
+            import tempfile
+            filename = tempfile.mktemp(prefix="virtmanager-firstrun-keyfile")
+            self.gsettings_keyfile = filename
+            atexit.register(lambda: os.unlink(filename))
+
 
 def main():
     (options, leftovers) = parse_commandline()