[RAUC] Is it possible to change the [system]compatible= string after it has already been set/flashed?

[Brian Hutchinson via RAUC <rauc@pengutronix.de>]

Hi,

Since it's common to produce boards with pre-programmed flash etc., is
it possible to change the [system]compatible= string when hardware
changes happen and the compatible string needs to be updated when it
has already been set previously?

I know that hooks could be used to key in on bundle version
information to implement things like downgrade barriers etc., but it
just feels more elegant to update the compatible string to describe
hardware changes that are human readable than to keep up with a eye
chart truth table of version number combinations to determine what is
safe to downgrade, upgrade etc.

I was thinking if maybe [system]variant-file was used in system.conf,
then a pre-install hook could easily manipulate the compatible string,
but not sure that would work.

This almost feels like the intermediate update that's necessary with
changing rauc versions ... but I searched the mail archives and
couldn't find anyone wondering about this sort of thing so thought I'd
ask Jan, Enrico & Co. their thoughts.

Regards,

Brian