daemon/copy.go

package daemon

import (
	"io"

	"github.com/docker/docker/engine"
)

func (daemon *Daemon) ContainerCopy(job *engine.Job) engine.Status {
	if len(job.Args) != 2 {
		return job.Errorf("Usage: %s CONTAINER RESOURCE\n", job.Name)
	}

	var (
		name     = job.Args[0]
		resource = job.Args[1]
	)

	if container := daemon.Get(name); container != nil {

		data, err := container.Copy(resource)
		if err != nil {
			return job.Error(err)
		}
		defer data.Close()

		if _, err := io.Copy(job.Stdout, data); err != nil {
			return job.Error(err)
		}
		return engine.StatusOK
	}
	return job.Errorf("No such container: %s", name)
}