| bytes | Package bytes implements functions for the manipulation of byte slices. |
| github.com/docker/docker/pkg/archive | Package archive provides helper functions for dealing with archive files. |
| io | Package io provides basic interfaces to I/O primitives. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |
| testing | Package testing provides support for automated testing of Go packages. |