move work on execution service

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

execution/executor.go

@@ -1,6 +1,11 @@
 package execution
 
-import "io"
+import (
+	"io"
+	"os"
+
+	"github.com/opencontainers/runtime-spec/specs-go"
+)
 
 type CreateOpts struct {
 	Bundle string
@@ -9,9 +14,23 @@ type CreateOpts struct {
 	Stderr io.Writer
 }
 
+type CreateProcessOpts struct {
+	Spec   specs.Process
+	Stdin  io.Reader
+	Stdout io.Writer
+	Stderr io.Writer
+}
+
 type Executor interface {
 	Create(id string, o CreateOpts) (*Container, error)
+	Pause(*Container) error
+	Resume(*Container) error
+	Status(*Container) (Status, error)
 	List() ([]*Container, error)
 	Load(id string) (*Container, error)
-	Delete(string) error
+	Delete(*Container) error
+
+	StartProcess(*Container, CreateProcessOpts) (Process, error)
+	SignalProcess(*Container, os.Signal) error
+	DeleteProcess(*Container, string) error
 }