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export.go
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export.go
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package daemon
import (
"fmt"
"io"
"runtime"
"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
}
if runtime.GOOS == "windows" && container.OS == "windows" {
return fmt.Errorf("the daemon on this operating system does not support exporting Windows containers")
}
if container.IsDead() {
err := fmt.Errorf("You cannot export container %s which is Dead", container.ID)
return stateConflictError{err}
}
if container.IsRemovalInProgress() {
err := fmt.Errorf("You cannot export container %s which is being removed", container.ID)
return stateConflictError{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) (arch io.ReadCloser, err error) {
rwlayer, err := daemon.stores[container.OS].layerStore.GetRWLayer(container.ID)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
daemon.stores[container.OS].layerStore.ReleaseRWLayer(rwlayer)
}
}()
_, err = rwlayer.Mount(container.GetMountLabel())
if err != nil {
return nil, err
}
archive, err := archivePath(container.BaseFS, container.BaseFS.Path(), &archive.TarOptions{
Compression: archive.Uncompressed,
UIDMaps: daemon.idMappings.UIDs(),
GIDMaps: daemon.idMappings.GIDs(),
})
if err != nil {
rwlayer.Unmount()
return nil, err
}
arch = ioutils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
rwlayer.Unmount()
daemon.stores[container.OS].layerStore.ReleaseRWLayer(rwlayer)
return err
})
daemon.LogContainerEvent(container, "export")
return arch, err
}