Wrapping libyaml in go

by February 28, 2014

We recently released version 6.0.0 of cf, the command line client for Cloud Foundry. cf was previously written in Ruby, and we have rewritten it in Go. This allowed us to package cf as as a single binary and simplified our deployment strategy enormously.
The YAML problem
Two weeks before our release, we realized that the go YAML library we were using, goyaml, is distributed under the LGPL license. This makes it unusable for cf. We had to quickly find another way to parse YAML in cf.
The definitive YAML implementation is a C library called libyaml. We knew that Go had good support for interfacing with C libraries, so we decided to write our own go bindings to libyaml. This felt a bit risky given that we were releasing in two weeks, so we named our creation ‘gamble’.