| 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/identifiers | Package identifiers provides common validation for identifiers and keys across containerd. |
| github.com/containerd/errdefs | Package errdefs defines the common errors used throughout containerd packages. |
| github.com/containerd/ttrpc | package ttrpc defines and implements a low level simple transfer protocol optimized for low latency and reliable connections between processes on the same host. |
| google.golang.org/grpc/metadata | Package metadata define the structure of the metadata supported by gRPC library. |
| os | Package os provides a platform-independent interface to operating system functionality. |