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package daemon // import "github.com/docker/docker/daemon"
import (
"fmt"
"io"
"github.com/docker/docker/container"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/system"
)
// 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 {
ctr, err := daemon.GetContainer(name)
if err != nil {
return err
}
if isWindows && ctr.OS == "windows" {
return fmt.Errorf("the daemon on this operating system does not support exporting Windows containers")
}
if ctr.IsDead() {
err := fmt.Errorf("You cannot export container %s which is Dead", ctr.ID)
return errdefs.Conflict(err)
}
if ctr.IsRemovalInProgress() {
err := fmt.Errorf("You cannot export container %s which is being removed", ctr.ID)
return errdefs.Conflict(err)
}
data, err := daemon.containerExport(ctr)
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) (arch io.ReadCloser, err error) {
if !system.IsOSSupported(container.OS) {
return nil, fmt.Errorf("cannot export %s: %s ", container.ID, system.ErrNotSupportedOperatingSystem)
}
rwlayer, err := daemon.imageService.GetLayerByID(container.ID, container.OS)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
daemon.imageService.ReleaseLayer(rwlayer, container.OS)
}
}()
basefs, err := rwlayer.Mount(container.GetMountLabel())
if err != nil {
return nil, err
}
archv, err := archivePath(basefs, basefs.Path(), &archive.TarOptions{
Compression: archive.Uncompressed,
UIDMaps: daemon.idMapping.UIDs(),
GIDMaps: daemon.idMapping.GIDs(),
}, basefs.Path())
if err != nil {
rwlayer.Unmount()
return nil, err
}
arch = ioutils.NewReadCloserWrapper(archv, func() error {
err := archv.Close()
rwlayer.Unmount()
daemon.imageService.ReleaseLayer(rwlayer, container.OS)
return err
})
daemon.LogContainerEvent(container, "export")
return arch, err
}
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