package daemon
 

 import (

 	"fmt"
 

 	"github.com/docker/docker/container"

 )

 
 // ContainerPause pauses a container

 func (daemon *Daemon) ContainerPause(name string) error {

 	container, err := daemon.GetContainer(name)

 	if err != nil {
 		return err
 	}
 

 	if err := daemon.containerPause(container); err != nil {

 		return err

 	}
 
 	return nil
 }

 
 // containerPause pauses the container execution without stopping the process.
 // The execution can be resumed by calling containerUnpause.

 func (daemon *Daemon) containerPause(container *container.Container) error {

 	container.Lock()
 	defer container.Unlock()
 
 	// We cannot Pause the container which is not running
 	if !container.Running {

 		return errNotRunning{container.ID}

 	}
 
 	// We cannot Pause the container which is already paused
 	if container.Paused {

 		return fmt.Errorf("Container %s is already paused", container.ID)

 	}
 

 	// We cannot Pause the container which is restarting
 	if container.Restarting {

 		return errContainerIsRestarting(container.ID)

 	}
 

 	if err := daemon.containerd.Pause(container.ID); err != nil {

 		return fmt.Errorf("Cannot pause container %s: %s", container.ID, err)

 	}

 	return nil
 }