| bytes | Package bytes implements functions for the manipulation of byte slices. |
| container/list | Package list implements a doubly linked list. |
| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| expvar | Package expvar provides a standardized interface to public variables, such as operation counters in servers. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/docker/distribution | Package distribution will define the interfaces for the components of docker distribution. |
| github.com/docker/distribution/configuration | |
| github.com/docker/distribution/context | Package context provides several utilities for working with Go's context in http requests. |
| github.com/docker/distribution/reference | Package reference is deprecated, and has moved to github.com/distribution/reference. |
| github.com/docker/distribution/uuid | Package uuid provides simple UUID generation. |
| github.com/opencontainers/go-digest | Package digest provides a generalized type to opaquely represent message digests and their operations within the registry. |
| github.com/sirupsen/logrus | Package logrus is a structured logger for Go, completely API compatible with the standard library logger. |
| net/http | Package http provides HTTP client and server implementations. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |