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Fix daemon panic use wrong graphdriver with --live-restore flag

Signed-off-by: Lei Jitang <leijitang@huawei.com>

Lei Jitang authored on 2016/07/15 17:59:52
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@@ -651,7 +651,7 @@ func (daemon *Daemon) Shutdown() error {
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 	daemon.shutdown = true
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 	// Keep mounts and networking running on daemon shutdown if
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 	// we are to keep containers running and restore them.
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-	if daemon.configStore.LiveRestore {
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+	if daemon.configStore.LiveRestore && daemon.containers != nil {
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 		// check if there are any running containers, if none we should do some cleanup
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 		if ls, err := daemon.Containers(&types.ContainerListOptions{}); len(ls) != 0 || err != nil {
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 			return nil