mirror of
https://github.com/moby/moby.git
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92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
package daemon
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"github.com/containerd/log"
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"github.com/docker/docker/api/types/events"
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"github.com/docker/docker/daemon/container"
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"github.com/docker/docker/errdefs"
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"github.com/moby/go-archive"
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"github.com/moby/go-archive/chrootarchive"
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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(ctx context.Context, name string, out io.Writer) error {
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ctr, 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 isWindows && ctr.ImagePlatform.OS == "windows" {
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return errors.New("the daemon on this operating system does not support exporting Windows containers")
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}
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if ctr.IsDead() {
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err := fmt.Errorf("You cannot export container %s which is Dead", ctr.ID)
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return errdefs.Conflict(err)
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}
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if ctr.IsRemovalInProgress() {
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err := fmt.Errorf("You cannot export container %s which is being removed", ctr.ID)
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return errdefs.Conflict(err)
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}
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err = daemon.containerExport(ctx, ctr, out)
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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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return nil
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}
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func (daemon *Daemon) containerExport(ctx context.Context, ctr *container.Container, out io.Writer) error {
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rwl := ctr.RWLayer
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if rwl == nil {
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return fmt.Errorf("container %s has no rootfs", ctr.ID)
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}
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if err := ctx.Err(); err != nil {
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return err
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}
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basefs, err := rwl.Mount(ctr.GetMountLabel())
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if err != nil {
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return err
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}
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defer func() {
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if err := rwl.Unmount(); err != nil {
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log.G(ctx).WithFields(log.Fields{"error": err, "container": ctr.ID}).Warn("Failed to unmount container RWLayer after export")
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}
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}()
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archv, err := chrootarchive.Tar(basefs, &archive.TarOptions{
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Compression: archive.Uncompressed,
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IDMap: daemon.idMapping,
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}, basefs)
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if err != nil {
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return err
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}
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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context.AfterFunc(ctx, func() {
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_ = archv.Close()
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})
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// Stream the entire contents of the container (basically a volatile snapshot)
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if _, err := io.Copy(out, archv); err != nil {
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if err := ctx.Err(); err != nil {
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return errdefs.Cancelled(err)
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}
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return err
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}
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daemon.LogContainerEvent(ctr, events.ActionExport)
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return nil
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}
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