daemon/unpause.go
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 package daemon
 
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 import (
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 	"fmt"
 
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 	"github.com/docker/docker/container"
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 )
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 // ContainerUnpause unpauses a container
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 func (daemon *Daemon) ContainerUnpause(name string) error {
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 	container, err := daemon.GetContainer(name)
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 	if err != nil {
 		return err
 	}
 
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 	if err := daemon.containerUnpause(container); err != nil {
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 		return err
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 	}
 
 	return nil
 }
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 // containerUnpause resumes the container execution after the container is paused.
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 func (daemon *Daemon) containerUnpause(container *container.Container) error {
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 	container.Lock()
 	defer container.Unlock()
 
 	// We cannot unpause the container which is not paused
 	if !container.Paused {
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 		return fmt.Errorf("Container %s is not paused", container.ID)
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 	}
 
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 	if err := daemon.containerd.Resume(container.ID); err != nil {
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 		return fmt.Errorf("Cannot unpause container %s: %s", container.ID, err)
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 	}
 
 	return nil
 }