type Cmd struct {
	// Host is the process host in which to launch the process.
	Host cow.ProcessHost

	// The OCI spec for the process.
	Spec *specs.Process

	// Standard IO streams to relay to/from the process.
	Stdin  io.Reader
	Stdout io.Writer
	Stderr io.Writer

	// Log provides a logrus entry to use in logging IO copying status.
	Log *logrus.Entry

	// Context provides a context that terminates the process when it is done.
	Context context.Context

	// CopyAfterExitTimeout is the amount of time after process exit we allow the
	// stdout, stderr relays to continue before forcibly closing them if not
	// already completed. This is primarily a safety step against the HCS when
	// it fails to send a close on the stdout, stderr pipes when the process
	// exits and blocks the relay wait groups forever.
	CopyAfterExitTimeout time.Duration

	// Process is filled out after Start() returns.
	Process cow.Process

	// ExitState is filled out after Wait() (or Run() or Output()) completes.
	ExitState *ExitState
	// contains filtered or unexported fields
}

type ExitError struct {
	*ExitState
}

type ExitState struct {
	// contains filtered or unexported fields
}

type UpstreamIO interface {
	// Close closes all open io.
	//
	// This call is idempotent and safe to call multiple times.
	Close(ctx context.Context)
	// CloseStdin closes just `Stdin()` if open.
	//
	// This call is idempotent and safe to call multiple times.
	CloseStdin(ctx context.Context)
	// Stdin returns the open `stdin` reader. If `stdin` was never opened this
	// will return `nil`.
	Stdin() io.Reader
	// StdinPath returns the original path used to open the `Stdin()` reader.
	StdinPath() string
	// Stdout returns the open `stdout` writer. If `stdout` was never opened
	// this will return `nil`.
	Stdout() io.Writer
	// StdoutPath returns the original path used to open the `Stdout()` writer.
	StdoutPath() string
	// Stderr returns the open `stderr` writer. If `stderr` was never opened
	// this will return `nil`.
	Stderr() io.Writer
	// StderrPath returns the original path used to open the `Stderr()` writer.
	StderrPath() string
	// Terminal returns `true` if the connection is emulating a terminal. If
	// `true` `Stderr()` will always return `nil` and `StderrPath()` will always
	// return `""`.
	Terminal() bool
}