| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/containerd/containerd/cio | |
| github.com/containerd/log | Package log provides types and functions related to logging, passing loggers through a context, and attaching context to the logger. |
| github.com/docker/docker/pkg/broadcaster | |
| github.com/docker/docker/pkg/ioutils | |
| github.com/docker/docker/pkg/pools | Package pools provides a collection of pools which provide various data types with buffers. |
| github.com/moby/term | Package term provides structures and helper functions to work with terminal (state, sizes). |
| github.com/pkg/errors | Package errors provides simple error handling primitives. |
| golang.org/x/sync/errgroup | Package errgroup provides synchronization, error propagation, and Context cancelation for groups of goroutines working on subtasks of a common task. |
| io | Package io provides basic interfaces to I/O primitives. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |