Cool. fpm's a good tool, but it requires a lot of command line fu, and isn't source control friendly. One of the reasons for swaddle was to get more of this stuff into source control and less into complex build scripts. One of the others was a major headache we once had with broken ruby versions on build servers breaking things like fpm (especially when multiple versions were needed). Swaddle fixes this, too.

Coming from fpm, this tool is much more complete while maintaining the same simplicity. With fpm, you have to pass everything on the command line which I don't like. Swaddle allows you to save your packaging config in your repo in separate config files. It helped us substantially at ReleaseQueue.com to live by our own product rules: package everything!