Move runtime interfaces to runtime package

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

runtime/task.go

@@ -0,0 +1,78 @@
+package runtime
+
+import "context"
+
+type TaskInfo struct {
+	ID          string
+	ContainerID string
+	Runtime     string
+	Spec        []byte
+	Namespace   string
+}
+
+type Task interface {
+	// Information of the container
+	Info() TaskInfo
+	// Start the container's user defined process
+	Start(context.Context) error
+	// State returns the container's state
+	State(context.Context) (State, error)
+	// Pause pauses the container process
+	Pause(context.Context) error
+	// Resume unpauses the container process
+	Resume(context.Context) error
+	// Kill signals a container
+	Kill(context.Context, uint32, uint32, bool) error
+	// Exec adds a process into the container
+	Exec(context.Context, ExecOpts) (Process, error)
+	// Processes returns all pids for the container
+	Processes(context.Context) ([]uint32, error)
+	// Pty resizes the processes pty/console
+	ResizePty(context.Context, uint32, ConsoleSize) error
+	// CloseStdin closes the processes stdin
+	CloseIO(context.Context, uint32) error
+	// Checkpoint checkpoints a container to an image with live system data
+	Checkpoint(context.Context, string, map[string]string) error
+	// DeleteProcess deletes a specific exec process via the pid
+	DeleteProcess(context.Context, uint32) (*Exit, error)
+	// Update sets the provided resources to a running task
+	Update(context.Context, []byte) error
+}
+
+type ExecOpts struct {
+	Spec []byte
+	IO   IO
+}
+
+type Process interface {
+	// State returns the process state
+	State(context.Context) (State, error)
+	// Kill signals a container
+	Kill(context.Context, uint32, bool) error
+}
+
+type ConsoleSize struct {
+	Width  uint32
+	Height uint32
+}
+
+type Status int
+
+const (
+	CreatedStatus Status = iota + 1
+	RunningStatus
+	StoppedStatus
+	DeletedStatus
+	PausedStatus
+)
+
+type State struct {
+	// Status is the current status of the container
+	Status Status
+	// Pid is the main process id for the container
+	Pid      uint32
+	Stdin    string
+	Stdout   string
+	Stderr   string
+	Terminal bool
+}