Fixed #22576: Ensure makemigrations doesn't touch the database.

                self.stderr.write("App '%s' could not be found. Is it in INSTALLED_APPS?" % app_label)

            sys.exit(2)

        # Load the current graph state. Takes a connection, but it's not used

        # (makemigrations doesn't look at the database state).

        # Also make sure the graph is built without unmigrated apps shoehorned in.

        loader = MigrationLoader(connections[DEFAULT_DB_ALIAS])

        # Load the current graph state. Pass in None for the connection so

        # the loader doesn't try to resolve replaced migrations from DB.

        loader = MigrationLoader(None)

        # Before anything else, see if there's conflicting apps and drop out

        # hard if there are any and they don't want to merge

        # Load disk data

        self.load_disk()

        # Load database data

        if self.connection is None:

            self.applied_migrations = set()

        else:

            recorder = MigrationRecorder(self.connection)

            self.applied_migrations = recorder.applied_migrations()

        # Do a first pass to separate out replacing and non-replacing migrations