6767: WIP, allow opening of database without using filesystem

gramps/gen/db/generic.py

@@ -765,7 +765,10 @@ class DbGeneric(DbWriteBase, DbReadBase, UpdateCallback, Callback):
         self.surname_list = self.get_surname_list()
 
         self.set_save_path(directory)
-        self.undolog = os.path.join(self._directory, DBUNDOFN)
+        if self._directory:
+            self.undolog = os.path.join(self._directory, DBUNDOFN)
+        else:
+            self.undolog = None
         self.undodb = DbGenericUndo(self, self.undolog)
         self.undodb.open()
 

gramps/gen/merge/diff.py

@@ -176,6 +176,7 @@ def import_as_dict(filename, user=None):
     if user is None:
         user = User()
     db = DictionaryDb()
+    db.load(None)
     db.set_feature("skip-import-additions", True)
     dbstate = DbState()
     climanager = CLIManager(dbstate, setloader=False, user=user)

gramps/plugins/database/dictionarydb.py

@@ -970,6 +970,7 @@ class DictionaryDb(DbGeneric):
         # Dictionary-specific load:
         from gramps.plugins.importer.importxml import importData
         from gramps.cli.user import User 
-        filename = os.path.join(self._directory, "data.gramps")
-        if os.path.isfile(filename):
-            importData(self, filename, User())
+        if self._directory:
+            filename = os.path.join(self._directory, "data.gramps")
+            if os.path.isfile(filename):
+                importData(self, filename, User())