Re: [PATCH] kas: Support kas build system selection

["'MOESSBAUER, Felix' via isar-users" <isar-users@googlegroups.com>]

On Tue, 2026-06-09 at 14:07 +0300, Anton Mikanovich wrote:
> 09.06.2026 14:01, MOESSBAUER, Felix wrote:
> > On Tue, 2026-06-09 at 11:53 +0300, Anton Mikanovich wrote:
> > >   config KAS_BUILD_SYSTEM
> > >   	string
> > > +	default "isar-privileged" if KAS_BUILD_SYSTEM_ISAR_PRIVILEGED
> > >   	default "isar-rootless"
> > Note, that this will only work on re-execution of kas, i.e. you need to
> > save the config and then run kas build. Running kas menu + build does
> > not work, as it is in the wrong container / execution mode.
> > 
> > Felix
> In this case previously set "--isar" value will be used, which is still
> supported but results in warning by kas.
> Is it a big problem?

Well... --isar and --isar-privileged are the same. We should anyways
use --isar to still support older kas releases (in fact we don't even
have a kas release which supports --isar-privileged yet).

The bigger issue is that kas-container --isar-rootless only affects how
the container is started, but not how the build is started. The build
is started based on the build_system entry in the config.yaml file,
whereby rootless mode sets the ISAR_ROOTLESS=1 variable in the local
config.

kas-container also reads the build_system value from the KConfig or
.config.yml and starts the container accordingly. By that, we have to
treat the build system mode (rootless or privileged) as INPUT to kas
menu instead of a KConfig option of the menu.

My proposal is to just keep the build_system as "isar" in both the
KConfig and isar.yaml for now (at least until we have a kas version
that supports both). Later on, we can model the switching.

Best regards,
Felix

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