docs: def receive(self, path, diff, showProgress=True):
          """ Return a context manager for stream that will store a diff. """
          directory = os.path.dirname(path)
  
          cmd = ["btrfs", "receive", "-e", directory]
  
          if Store.skipDryRun(logger, self.dryrun)("Command: %s", cmd):
              return None
  
          if not os.path.exists(directory):
              os.makedirs(directory)
  
          process = subprocess.Popen(
              cmd,
              stdin=subprocess.PIPE,
              stderr=subprocess.PIPE,
              stdout=DEVNULL,
          )
          _makeNice(process)
  
          return _Writer(process, process.stdin, path, diff, showProgress)