Move Container and runtime to plugin pkg

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

plugin/runtime.go

@@ -0,0 +1,42 @@
+package plugin
+
+import (
+	"context"
+	"time"
+
+	"github.com/containerd/containerd"
+)
+
+type IO struct {
+	Stdin    string
+	Stdout   string
+	Stderr   string
+	Terminal bool
+}
+
+type CreateOpts struct {
+	// Spec is the OCI runtime spec
+	Spec []byte
+	// Rootfs mounts to perform to gain access to the container's filesystem
+	Rootfs []containerd.Mount
+	// IO for the container's main process
+	IO IO
+}
+
+type Exit struct {
+	Status    uint32
+	Timestamp time.Time
+}
+
+// Runtime is responsible for the creation of containers for a certain platform,
+// arch, or custom usage.
+type Runtime interface {
+	// Create creates a container with the provided id and options
+	Create(ctx context.Context, id string, opts CreateOpts) (Container, error)
+	// Containers returns all the current containers for the runtime
+	Containers(context.Context) ([]Container, error)
+	// Delete removes the container in the runtime
+	Delete(context.Context, Container) (*Exit, error)
+	// Events returns events for the runtime and all containers created by the runtime
+	Events(context.Context) <-chan *containerd.Event
+}