Active slice, only for a next boot

[Chris Rees]

On 26 March 2012 18:10,  <rank1seeker at gmail.com> wrote:
> ----- Original Message -----
> From: John Baldwin <jhb at freebsd.org>
> To: freebsd-hackers at freebsd.org
> Cc: rank1seeker at gmail.com, hackers at freebsd.org
> Date: Mon, 26 Mar 2012 10:18:53 -0400
> Subject: Re: Active slice, only for a next boot
>
>> On Sunday, March 25, 2012 2:49:17 pm rank1seeker at gmail.com wrote:
>> > After having a thought about this issue and also currently looking at a
>> BootEasy boot manager ...
>> > 'boot0cfg' is almost perfect for this task and should/could be "exploited".
>> >
>> > It's '-o noupdate' already does a major task, of keeping main slice active.
>> > Now all we need is a flag, through which we specify slice to boot (replacing
>> human presing button).
>> > From that point on, existing code simply proceeds with received value.
>> >
>> > '-o noupdate' ensures next boot will bring up main/active slice.
>>
>> You mean like 'boot0cfg -s 4'?
>>
>> --
>> John Baldwin
>>
>
>
> Yes, but new flag for that purpose ('-n' for example => nextboot).
>
> I.e;
>    # 'boot0cfg -s 4 -o noupdate -n 3'
>
> Would, set the default/main boot selection to slice 4 and  '-o noupdate'  ensures it remains that way, while '-n 3' would auto press/choose slice 3 in selection menu, as human would.
> Well in that case, better to not show menu at all, thus only "blic" into slice 3.
> At next boot it is at slice 4 again.

I'm afraid this sounds like a great way to make a very confusing
scenario, where you have to reboot twice to be sure of a consistent
boot sector, unless I've misunderstood you.

Chris