| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/docker/docker/pkg/archive | Package archive provides helper functions for dealing with archive files. |
| github.com/docker/docker/pkg/idtools | |
| github.com/docker/docker/pkg/longpath | Package longpath introduces some constants and helper functions for handling long paths in Windows. |
| 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. |