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0380fbff37
Signed-off-by: John Howard <jhoward@microsoft.com> This PR has the API changes described in https://github.com/moby/moby/issues/34617. Specifically, it adds an HTTP header "X-Requested-Platform" which is a JSON-encoded OCI Image-spec `Platform` structure. In addition, it renames (almost all) uses of a string variable platform (and associated) methods/functions to os. This makes it much clearer to disambiguate with the swarm "platform" which is really os/arch. This is a stepping stone to getting the daemon towards fully multi-platform/arch-aware, and makes it clear when "operating system" is being referred to rather than "platform" which is misleadingly used - sometimes in the swarm meaning, but more often as just the operating system.
81 lines
2.2 KiB
Go
81 lines
2.2 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.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 container.IsDead() {
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err := fmt.Errorf("You cannot export container %s which is Dead", container.ID)
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return stateConflictError{err}
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}
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if container.IsRemovalInProgress() {
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err := fmt.Errorf("You cannot export container %s which is being removed", container.ID)
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return stateConflictError{err}
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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) (arch io.ReadCloser, err error) {
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rwlayer, err := daemon.stores[container.OS].layerStore.GetRWLayer(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.stores[container.OS].layerStore.ReleaseRWLayer(rwlayer)
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}
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}()
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_, 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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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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rwlayer.Unmount()
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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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rwlayer.Unmount()
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daemon.stores[container.OS].layerStore.ReleaseRWLayer(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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