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The download method for Libcloud objects returns a boolean, which means that our CRL download could fail silently. The RackspaceCRLProvider would not raise an error until it tried to open the full path for the downloaded resource. This checks the return status of the download call and raises an error if the download failed. For reference: https://libcloud.readthedocs.io/en/latest/storage/api.html#libcloud.storage.base.StorageDriver.download_object