834       identifiers of the instances to list versions for.

   834       identifiers of the instances to list versions for.

   835     """

   835     """

   836     name = 'versions'

   836     name = 'versions'

   837 

   837 

   838     def versions_instance(self, appid):

   838     def versions_instance(self, appid):

   840         config = cwcfg.config_for(appid)

   839         config = cwcfg.config_for(appid)

   841         # should not raise error if db versions don't match fs versions

   840         # should not raise error if db versions don't match fs versions

   842         config.repairing = True

   841         config.repairing = True

   843         if hasattr(config, 'set_sources_mode'):

   842         if hasattr(config, 'set_sources_mode'):

   844             config.set_sources_mode(('migration',))

   843             config.set_sources_mode(('migration',))