Persist pause state to disk to support container live restore

Signed-off-by: Lei Jitang <leijitang@huawei.com>

container/state.go

@@ -210,7 +210,6 @@ func (s *State) SetExitCode(ec int) {
 func (s *State) SetRunning(pid int, initial bool) {
 	s.error = ""
 	s.Running = true
-	s.Paused = false
 	s.Restarting = false
 	s.exitCode = 0
 	s.Pid = pid

daemon/monitor.go

@@ -99,11 +99,17 @@ func (daemon *Daemon) StateChanged(id string, e libcontainerd.StateInfo) error {
 	case libcontainerd.StatePause:
 		// Container is already locked in this case
 		c.Paused = true
+		if err := c.ToDisk(); err != nil {
+			return err
+		}
 		daemon.updateHealthMonitor(c)
 		daemon.LogContainerEvent(c, "pause")
 	case libcontainerd.StateResume:
 		// Container is already locked in this case
 		c.Paused = false
+		if err := c.ToDisk(); err != nil {
+			return err
+		}
 		daemon.updateHealthMonitor(c)
 		daemon.LogContainerEvent(c, "unpause")
 	}