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package daemon
import (
"fmt"
"io"
"github.com/docker/docker/container"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/ioutils"
)
// ContainerExport writes the contents of the container to the given
// writer. An error is returned if the container cannot be found.
func (daemon *Daemon) ContainerExport(name string, out io.Writer) error {
container, err := daemon.GetContainer(name)
if err != nil {
return err
}
data, err := daemon.containerExport(container)
if err != nil {
return fmt.Errorf("Error exporting container %s: %v", name, err)
}
defer data.Close()
// Stream the entire contents of the container (basically a volatile snapshot)
if _, err := io.Copy(out, data); err != nil {
return fmt.Errorf("Error exporting container %s: %v", name, err)
}
return nil
}
func (daemon *Daemon) containerExport(container *container.Container) (archive.Archive, error) {
if err := daemon.Mount(container); err != nil {
return nil, err
}
uidMaps, gidMaps := daemon.GetUIDGIDMaps()
archive, err := archive.TarWithOptions(container.BaseFS, &archive.TarOptions{
Compression: archive.Uncompressed,
UIDMaps: uidMaps,
GIDMaps: gidMaps,
})
if err != nil {
daemon.Unmount(container)
return nil, err
}
arch := ioutils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
daemon.Unmount(container)
return err
})
daemon.LogContainerEvent(container, "export")
return arch, err
}
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