Imports of package copyfile

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/Microsoft/hcsshim/internal/oc
go.opencensus.io/tracePackage trace contains support for OpenCensus distributed tracing.
syscallPackage syscall contains an interface to the low-level operating system primitives.
unsafePackage unsafe contains operations that step around the type safety of Go programs.