08/25 Goofys allows you to mount an S3 bucket as a filey system.
It's a Filey System instead of a File System because goofys strives for performance first and POSIX second.
Particularly things that are difficult to support on S3 or would translate into more than one round-trip
would either fail (random writes) or faked (no per-file permission).
Goofys does not have an on disk data cache (checkout catfs), and consistency model is close-to-open.