dotcloud/docker

package daemon // import "github.com/docker/docker/daemon"

import (
    "context"
    "fmt"

    "github.com/containerd/log"
    "github.com/docker/docker/api/types/events"
    "github.com/docker/docker/container"
)

// ContainerUnpause unpauses a container
func (daemon *Daemon) ContainerUnpause(name string) error {
    ctr, err := daemon.GetContainer(name)
    if err != nil {
        return err
    }
    return daemon.containerUnpause(ctr)
}

// containerUnpause resumes the container execution after the container is paused.
func (daemon *Daemon) containerUnpause(ctr *container.Container) error {
    ctr.Lock()
    defer ctr.Unlock()

    // We cannot unpause the container which is not paused
    if !ctr.Paused {
        return fmt.Errorf("Container %s is not paused", ctr.ID)
    }
    tsk, err := ctr.GetRunningTask()
    if err != nil {
        return err
    }

    if err := tsk.Resume(context.Background()); err != nil {
        return fmt.Errorf("Cannot unpause container %s: %s", ctr.ID, err)
    }

    ctr.Paused = false
    daemon.setStateCounter(ctr)
    daemon.updateHealthMonitor(ctr)
    daemon.LogContainerEvent(ctr, events.ActionUnPause)

    if err := ctr.CheckpointTo(context.WithoutCancel(context.TODO()), daemon.containersReplica); err != nil {
        log.G(context.TODO()).WithError(err).Warn("could not save container to disk")
    }

    return nil
}