code: def load(self, dump_fn='', prep_only=0, force_upload=0, from_local=0, name=None, site=None, dest_dir=None):
          
  
          r = self.database_renderer(name=name, site=site)
  
          # Render the snapshot filename.
          r.env.dump_fn = self.get_default_db_fn(fn_template=dump_fn, dest_dir=dest_dir)
  
          from_local = int(from_local)
  
          prep_only = int(prep_only)
  
          missing_local_dump_error = r.format('Database dump file {dump_fn} does not exist.')
  
          # Copy snapshot file to target.
          if self.is_local:
              r.env.remote_dump_fn = dump_fn
          else:
              r.env.remote_dump_fn = '/tmp/' + os.path.split(r.env.dump_fn)[-1]
  
          if not prep_only and not self.is_local:
              if not self.dryrun:
                  assert os.path.isfile(r.env.dump_fn), missing_local_dump_error
              r.pc('Uploading MongoDB database snapshot...')
  #                 r.put(
  #                     local_path=r.env.dump_fn,
  #                     remote_path=r.env.remote_dump_fn)
              r.local('rsync -rvz --progress --no-p --no-g '
                  '--rsh "ssh -o StrictHostKeyChecking=no -i {key_filename}" '
                  '{dump_fn} {user}@{host_string}:{remote_dump_fn}')
  
          if self.is_local and not prep_only and not self.dryrun:
              assert os.path.isfile(r.env.dump_fn), missing_local_dump_error
  
          r.run_or_local(r.env.load_command)
docs: Restores a database snapshot onto the target database server.
  
          If prep_only=1, commands for preparing the load will be generated,
          but not the command to finally load the snapshot.