ca5ede2d0a
Create a supervisor interface to let the container monitor to emit events. Signed-off-by: David Calavera <david.calavera@gmail.com>
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
package daemon
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import (
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"io"
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derr "github.com/docker/docker/errors"
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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.Get(name)
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if err != nil {
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return 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 derr.ErrorCodeExportFailed.WithArgs(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 derr.ErrorCodeExportFailed.WithArgs(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) (archive.Archive, 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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uidMaps, gidMaps := daemon.GetUIDGIDMaps()
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archive, err := archive.TarWithOptions(container.basefs, &archive.TarOptions{
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Compression: archive.Uncompressed,
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UIDMaps: uidMaps,
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GIDMaps: gidMaps,
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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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