| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| github.com/containerd/containerd/errdefs | Package errdefs defines the common errors used throughout containerd packages. |
| github.com/pkg/errors | Package errors provides simple error handling primitives. |
| 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. |
| regexp | Package regexp implements regular expression search. |