82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"fmt"
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"io"
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"github.com/docker/docker/container"
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"github.com/docker/docker/errdefs"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/chrootarchive"
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"github.com/docker/docker/pkg/ioutils"
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)
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// ContainerExport writes the contents of the container to the given
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// writer. An error is returned if the container cannot be found.
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func (daemon *Daemon) ContainerExport(name string, out io.Writer) error {
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ctr, err := daemon.GetContainer(name)
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if err != nil {
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return err
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}
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if isWindows && ctr.OS == "windows" {
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return fmt.Errorf("the daemon on this operating system does not support exporting Windows containers")
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}
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if ctr.IsDead() {
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err := fmt.Errorf("You cannot export container %s which is Dead", ctr.ID)
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return errdefs.Conflict(err)
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}
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if ctr.IsRemovalInProgress() {
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err := fmt.Errorf("You cannot export container %s which is being removed", ctr.ID)
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return errdefs.Conflict(err)
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}
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data, err := daemon.containerExport(ctr)
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if err != nil {
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return fmt.Errorf("Error exporting container %s: %v", name, err)
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}
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defer data.Close()
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// Stream the entire contents of the container (basically a volatile snapshot)
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if _, err := io.Copy(out, data); err != nil {
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return fmt.Errorf("Error exporting container %s: %v", name, err)
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}
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return nil
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}
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func (daemon *Daemon) containerExport(container *container.Container) (arch io.ReadCloser, err error) {
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rwlayer, err := daemon.imageService.GetLayerByID(container.ID)
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if err != nil {
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return nil, err
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}
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defer func() {
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if err != nil {
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daemon.imageService.ReleaseLayer(rwlayer)
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}
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}()
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basefs, err := rwlayer.Mount(container.GetMountLabel())
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if err != nil {
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return nil, err
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}
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archv, err := chrootarchive.Tar(basefs, &archive.TarOptions{
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Compression: archive.Uncompressed,
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IDMap: daemon.idMapping,
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}, basefs)
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if err != nil {
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rwlayer.Unmount()
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return nil, err
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}
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arch = ioutils.NewReadCloserWrapper(archv, func() error {
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err := archv.Close()
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rwlayer.Unmount()
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daemon.imageService.ReleaseLayer(rwlayer)
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return err
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})
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daemon.LogContainerEvent(container, "export")
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return arch, err
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}
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