| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| github.com/coreos/etcd/pkg/fileutil | Package fileutil implements utility functions related to files and paths. |
| github.com/coreos/etcd/pkg/types | Package types declares various data types and implements type-checking functions. |
| log | Package log implements a simple logging package. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| path | Package path implements utility routines for manipulating slash-separated paths. |