Now I understand it. Thanks Geoff, Thanks Alex.

On Tuesday, March 7, 2017 at 10:23:40 AM UTC+8, Alex Crawford wrote:
>
> On 03/06, Geoff Levand wrote: 
> > On 03/05/2017 11:57 PM, Jovi Zhangwei wrote: 
> > > So does anyone knows the meaning of gptprio.next instruction? great 
> thanks. 
> > 
> > See these: 
> > 
> >   
> https://github.com/coreos/grub/blob/master/grub-core/commands/gptprio.c#L159 
> >   
> https://github.com/coreos/grub/commit/e49d5b587e46cd4611be2a5a18d2c2f8c9a4 
>
> To add on to this a bit, we use gptprio.next to select the latest, 
> non-failing version of the OS to boot. This is how we do automatic 
> rollbacks as part of the upgrade process. 
>
> -Alex 
>

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