Return Context Manager for a file-like (stream) object to store a diff.

def receive(self, diff, paths):
        """ Return Context Manager for a file-like (stream) object to store a diff. """
        path = self.selectReceivePath(paths)
        path = self._relativePath(path)

        if Store.skipDryRun(logger, self.dryrun)("receive to %s", path):
            return None

        (diffTo, diffFrom) = self.toArg.diff(diff)
        self._client.receive(path, diffTo, diffFrom)

        progress = DisplayProgress(diff.size) if self.showProgress is True else None
        return _SSHStream(self._client, progress)