Based on the rewrite API docs, it seems like this should be a method on Bucket, parallel to Bucket.copy_blob. Something like:

    def rewrite_blob(self, blob, destination_bucket, new_name, client=None):
        """Rewrite the given blob to the given bucket, with a new name.

        :type blob: :class:`gcloud.storage.blob.Blob`
        :param blob: The blob to be copied.

        :type destination_bucket: :class:`gcloud.storage.bucket.Bucket`
        :param destination_bucket: The bucket into which the blob should be
                                   copied.

        :type new_name: string
        :param new_name: (optional) the new name for the copied file.

        :type client: :class:`gcloud.storage.client.Client` or ``NoneType``
        :param client: Optional. The client to use.  If not passed, falls back
                       to the ``client`` stored on the current bucket.

        :rtype: bytes
        :returns: The new Blob.
        """
        client = self._require_client(client)
        if new_name is None:
            new_name = blob.name
        new_blob = Blob(bucket=destination_bucket, name=new_name)
        api_path = blob.path + '/rewriteTo' + new_blob.path
        resource = dict(blob._properties)
        result = client.connection.api_request(
            method='POST', path=api_path, data=resource,
            _target_object=new_blob)
        token = result.get('rewriteToken')
        while token not in (None, ''):
            query_params = {'rewriteToken': token}
            result = client.connection.api_request(
                method='POST', path=api_path, query_params=query_params,
                _target_object=new_blob)
            token = result.get('rewriteToken')
        new_blob._set_properties(result['resource'])
        return new_blob

Cloud storage rewrite with GCloud? #1960

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