There is this notion of "kexec boot"; I've never tried it, but it's
documentation claims "kexec is a system call that enables you to load
and boot into another kernel from the currently running kernel."

Maybe it comes with too many ifs and buts to be a viable approach.

Ralph.

karl@??? wrote on 20/12/18 00:36:
> Hendrik:
>> On Wed, Dec 19, 2018 at 12:09:29AM -0500, Steve Litt wrote:
>>> On Tue, 18 Dec 2018 23:33:30 +0100 (CET)
>>> karl@??? wrote:
>>>
>>>> With all this discussion about installing procedures, why do we need
>>>> to reboot during reboot ?
> I meant: to reboot during install ?
>>>> Couldn't one boot the install media like an initram thing and then
>>>> pivot_root (or what is used today) the real system and continuing
>>>> from there...
> ...
>> It's not possible to pivot_root away from the install USB to the
>> installed root system on rotating rust (or whatever permannt storage
>> the computer has?
>
> Ok.
>
>> Does this have anything to do with initramfs?
>
> Possibly not, but initramfs/initrd does that all the times, i.e.
> during boot, do something and then switch to installed system.
>
>> It would probably constrain the installer to use the same kernel as the
>> installee, though. Which means lots of installer versions.
>
> Yes, but this was meant as a "research" project, is it possible and if
> so, what are the consequences.
>
> ///
>
> One possible way to test this could be to have a greatly simplified
> installer in an initramfs/initrd, which basically does a "precompiled"
> install to a known system, and then switches to it and possible
> continues from that.
>
> Regards,
> /Karl Hammar
>
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