I added partial support for openstack-swift and reported [JCLOUDS-872](https://issues.apache.org/jira/browse/JCLOUDS-872) for the remaining features. Unfortunately Swift itself does not have the conditional copy options that other providers offer. We may want to implement this with two Swift RPCs, e.g., `blobMetadata`, check lastModified/ETag in jclouds, then call `copyBlob`, to gain cross-provider support.
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