The intent of this entirely over-engineered script is to make the process of adding Ceph extensions to boto3 very simple.
To use this script, simply execute it as-is, or use the -o option if you want to overwrite any existing 'extras' definition that's already in the path.
It creates the ~/.aws/models/s3/2006-03-01/ directory if it doesn't already exist, moves to that directory, and uses cURL to download the extensions file from https://raw.githubusercontent.com/ceph/ceph/master/examples/boto3/. Simple, for sure, but it beats typing all that out a bunch of times if you're adding this functionality in multiple places.