Re: [PATCH] bitbake: Move the preferred bootstrap assignment before including local.conf

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

On Fri, 2025-10-31 at 02:53 +0000, 'Liu, Yi' via isar-users wrote:
> > -----Original Message-----
> > From: Kiszka, Jan (FT RPD CED) <jan.kiszka@siemens.com>
> > Sent: Thursday, October 30, 2025 7:29 PM
> > To: Liu, Yi (FT RPD CED INW-CN) <liuyi@siemens.com>; isar-
> > users@googlegroups.com
> > Subject: Re: [PATCH] bitbake: Move the preferred bootstrap assignment
> > before including local.conf
> > 
> > On 30.10.25 04:06, 'Liu Yi' via isar-users wrote:
> > > This change relocates the assignment for the preferred providers of
> > > the bootstrap-host and bootstrap-target to occur before including
> > > local.conf, ensuring that these two variables in local.conf can be
> > > overwritten by the end users.
> > > 
> > > Signed-off-by: Liu Yi <liuyi@siemens.com>
> > > ---
> > >  meta/conf/bitbake.conf | 5 +++--
> > >  1 file changed, 3 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf index
> > > 5ab8ced7..a06ef90e 100644
> > > --- a/meta/conf/bitbake.conf
> > > +++ b/meta/conf/bitbake.conf
> > > @@ -210,6 +210,9 @@ TASK_USE_NETWORK = "1"
> > >  TASK_USE_SUDO = "1"
> > >  TASK_USE_NETWORK_AND_SUDO = "1"
> > > 
> > > +PREFERRED_PROVIDER_bootstrap-host ??= "isar-mmdebstrap-host"
> > > +PREFERRED_PROVIDER_bootstrap-target ??= "isar-mmdebstrap-target"
> > > +
> > >  include conf/local.conf
> > >  include conf/multiconfig/${BB_CURRENT_MC}.conf
> > >  include conf/machine/${MACHINE}.conf
> > > @@ -217,5 +220,3 @@ include conf/distro/${DISTRO}.conf
> > > 
> > >  PATCHRESOLVE ?= "noop"
> > > 
> > > -PREFERRED_PROVIDER_bootstrap-host ??= "isar-mmdebstrap-host"
> > > -PREFERRED_PROVIDER_bootstrap-target ??= "isar-mmdebstrap-target"
> > 
> > Looks good.
> > 
> > I suppose that this comes from some out-of-tree experiments with a non-
> > Debian, non-Raspberry and non-Ubuntu OS? ;)
> > 
> > Jan
> > 
> > --
> > Siemens AG, Foundational Technologies
> > Linux Expert Center
> 
> You guessed it.  
> 
> This comes from the experiment of building openKylinOS via ISAR. 

I would be happy to see these experiments also on this list. Feel free
to send as an RFC, similar to the raspbian support.

> 
> Somehow the build process got failed in the task do_bootstrap due to uninstalling of libc6,  
> if I chose the mmdebstrap as the preferred one.
> 
> So, I tried to switch to debootstrap in local.conf or in local-conf-head from kas yaml,  
> then found it always be overwritten by the value from bitbake.conf.

I'm a bit surprised why this did not work, as the extra-weak assignment
still can be overwritten by a weak or strong one.
Example:

kas_trixie.yml

header:
  version: 14

build_system: isar

machine: qemuamd64
distro: debian-trixie

target: mc:qemuamd64-trixie:isar-image-base

repos:
  isar:
    layers:
      meta:

local_conf_header:
  pref-prov: |
    PREFERRED_PROVIDER_bootstrap-host = "foo"

kas-container shell -c "bitbake-getvar -r bootstrap-host
PREFERRED_PROVIDER_bootstrap-host" kas_trixie.yml
# output
PREFERRED_PROVIDER_bootstrap-host="foo"

Felix

> 
> Best Regards,
> Liu Yi 
> 
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-- 
Siemens AG
Linux Expert Center
Friedrich-Ludwig-Bauer-Str. 3
85748 Garching, Germany

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