86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"runtime"
|
|
|
|
"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 {
|
|
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 errdefs.Conflict(err)
|
|
}
|
|
|
|
if container.IsRemovalInProgress() {
|
|
err := fmt.Errorf("You cannot export container %s which is being removed", container.ID)
|
|
return errdefs.Conflict(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) {
|
|
if !system.IsOSSupported(container.OS) {
|
|
return nil, fmt.Errorf("cannot export %s: %s ", container.ID, system.ErrNotSupportedOperatingSystem)
|
|
}
|
|
rwlayer, err := daemon.layerStores[container.OS].GetRWLayer(container.ID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer func() {
|
|
if err != nil {
|
|
daemon.layerStores[container.OS].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.layerStores[container.OS].ReleaseRWLayer(rwlayer)
|
|
return err
|
|
})
|
|
daemon.LogContainerEvent(container, "export")
|
|
return arch, err
|
|
}
|