Move runtime implementation types to pkg

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

runtime/container.go

@@ -0,0 +1,53 @@
+package runtime
+
+import (
+	"os"
+
+	"github.com/opencontainers/specs"
+)
+
+type Process interface {
+	Pid() (int, error)
+	Spec() specs.Process
+	Signal(os.Signal) error
+}
+type Status string
+
+const (
+	Paused  Status = "paused"
+	Running Status = "running"
+)
+
+type State struct {
+	Status Status `json:"status,omitempty"`
+}
+
+type Stdio struct {
+	Stderr string `json:"stderr,omitempty"`
+	Stdout string `json:"stdout,omitempty"`
+}
+
+type Container interface {
+	// ID returns the container ID
+	ID() string
+	// Start starts the init process of the container
+	Start() error
+	// Path returns the path to the bundle
+	Path() string
+	// Pid returns the container's init process id
+	Pid() (int, error)
+	// SetExited sets the exit status of the container after it's init dies
+	SetExited(status int)
+	// Delete deletes the container
+	Delete() error
+	// Processes returns all the containers processes that have been added
+	Processes() ([]Process, error)
+	// RemoveProcess removes a specific process for the container because it exited
+	RemoveProcess(pid int) error
+	// State returns the containers runtime state
+	State() State
+	// Resume resumes a paused container
+	Resume() error
+	// Pause pauses a running container
+	Pause() error
+}