cddfe04f6a
This enables docker cp and ADD/COPY docker build support for LCOW. Originally, the graphdriver.Get() interface returned a local path to the container root filesystem. This does not work for LCOW, so the Get() method now returns an interface that LCOW implements to support copying to and from the container. Signed-off-by: Akash Gupta <akagup@microsoft.com> Upstream-commit: 7a7357dae1bcccb17e9b2d4c7c8f5c025fce56ca Component: engine
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
package daemon
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import (
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"fmt"
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"io"
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"runtime"
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"github.com/docker/docker/container"
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"github.com/docker/docker/pkg/archive"
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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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container, 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 runtime.GOOS == "windows" && container.Platform == "windows" {
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return fmt.Errorf("the daemon on this platform does not support exporting Windows containers")
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}
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data, err := daemon.containerExport(container)
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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) (io.ReadCloser, error) {
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if err := daemon.Mount(container); err != nil {
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return nil, err
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}
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archive, err := archivePath(container.BaseFS, container.BaseFS.Path(), &archive.TarOptions{
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Compression: archive.Uncompressed,
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UIDMaps: daemon.idMappings.UIDs(),
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GIDMaps: daemon.idMappings.GIDs(),
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})
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if err != nil {
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daemon.Unmount(container)
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return nil, err
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}
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arch := ioutils.NewReadCloserWrapper(archive, func() error {
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err := archive.Close()
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daemon.Unmount(container)
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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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