Re: Cross-building for older releases on trixie broken?

["'Niedermayr, BENEDIKT' via isar-users" <isar-users@googlegroups.com>]

On 03.10.25 15:50, Uladzimir Bely wrote:
> On Fri, 2025-09-19 at 11:32 +0200, Jan Kiszka wrote:
>> On 19.09.25 10:23, Uladzimir Bely wrote:
>>> On Thu, 2025-09-18 at 07:49 +0200, 'Jan Kiszka' via isar-users
>>> wrote:
>>>> Hi,
>>>>
>>>> for some days, I'm playing with a trixie-based kas container
>>>> (currently
>>>> available via kas-isar:next from upstream), and I it seems I ran
>>>> into
>>>> an
>>>> issue that might be isar-related: Building e.g. qemu-
>>>> arm64:bookworm
>>>> with
>>>> that container fails:
>>>>
>>>>> Setup apt archive
>>>>> -----------------
>>>>>
>>>>> Merged Build-Depends: debhelper-compat (= 13), build-
>>>>> essential:amd64,
>>>> crossbuild-essential-arm64:amd64, apt-utils:amd64, libc-
>>>> dev:arm64,
>>>> libstdc++-dev:arm64
>>>>> Filtered Build-Depends: debhelper-compat (= 13),
>>>> build-essential:amd64, crossbuild-essential-arm64:amd64,
>>>> apt-utils:amd64, libc-dev:arm64, libstdc++-dev:arm64
>>>>> dpkg-deb: building package 'sbuild-build-depends-main-dummy' in
>>>> '/build/sshd-regen-keys-QAjoa6/resolver-
>>>> ruuPrM/apt_archive/sbuild-
>>>> build-depends-main-dummy.deb'.
>>>>> Ign:1 copy:/build/sshd-regen-keys-QAjoa6/resolver-
>>>>> ruuPrM/apt_archive
>>>> ./ InRelease
>>>>> Get:2 copy:/build/sshd-regen-keys-QAjoa6/resolver-
>>>>> ruuPrM/apt_archive
>>>> ./ Release [609 B]
>>>>> Ign:3 copy:/build/sshd-regen-keys-QAjoa6/resolver-
>>>>> ruuPrM/apt_archive
>>>> ./ Release.gpg
>>>>> Get:4 copy:/build/sshd-regen-keys-QAjoa6/resolver-
>>>>> ruuPrM/apt_archive
>>>> ./ Sources [690 B]
>>>>> Get:5 copy:/build/sshd-regen-keys-QAjoa6/resolver-
>>>>> ruuPrM/apt_archive
>>>> ./ Packages [733 B]
>>>>> Fetched 2032 B in 0s (0 B/s)
>>>>> Reading package lists...
>>>>> Reading package lists...
>>>>>
>>>>> Install main build dependencies (apt-based resolver)
>>>>> ----------------------------------------------------
>>>>>
>>>>> Installing build dependencies
>>>>> Reading package lists...
>>>>> Building dependency tree...
>>>>> Reading state information...
>>>>> E: Unable to locate package sbuild-build-depends-main-dummy
>>>>> apt-get failed.
>>>>> E: Package installation failed
>>>>> Not removing build depends: cloned chroot in use
>>>>> Reading package lists...
>>>>> Building dependency tree...
>>>>> Reading state information...
>>>>> E: Unable to locate package sbuild-build-depends-main-dummy
>>>>> apt-get failed.
>>>>>
>>>>
>>>> That was part of the sshd-regen-keys package build, but all
>>>> package
>>>> seem
>>>> to fail this way.
>>>>
>>>> I suspect we are improperly using the host dpkg tooling here,
>>>> rather
>>>> than that from the target distro (see other recent discussions we
>>>> had
>>>> here)...
>>>>
>>>> Jan
>>>>
>>>> -- 
>>>> Siemens AG, Foundational Technologies
>>>> Linux Expert Center
>>>
>>> Hello, Jan.
>>>
>>> I took a quick look at this. It seems cross-building is broken for
>>> trixie host only for bookworm target. Buster, bullseye and trixie
>>> targets looks OK.
>>>
>>
>> Hmm, maybe we are lucky with the other ones, but the same issue
>> applies
>> in principle.
>>
>>> The reason is still not clear for me - some failure happens with
>>> apt/dependencies, even before dpkg-buildpackage is called.
>>>
>>> Will try to debug.
>>>
>>
>> Thanks in advance!
>>
>> Jan
> 
> Hello again.
> 
> Got some time to debug it a bit more, but with no success.

I also stumbled over that issue after upgrading to KAS 5.0 (which now is
based on trixie).

I suspect the root cause to be this sbuild commit/PR [1], which should
solve this bug [2] regarding "libglib2.0-dev" builds/deps.

What confuses me a bit is that IMHO generally no cross-build originating
from trixie should work anymore.


[1]
https://salsa.debian.org/debian/sbuild/-/merge_requests/69/diffs?commit_id=3fe5278e47de798ef9cafabb8674cd8e1f41ab0b

[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=%231071246

> 
> So, the picture is still the same:
> 
> - Cross building trixie/bookworm (host/target) fails.
> - It fails on any target architecture
> - Non-ross building trixie/bookworm (host/target) is OK
> - Cross building trixie/buster, trixie/bullseye, trixie/trixie is OK.

Can I reproduce that locally somehow or is this a result of the CI?


Regards,
Benedikt
> 
> For me it looks like sbuild issue. But the reason remains unclear. ALl
> build depependencies sbuild lists are already in sbuild chroot, but if
> fails to generate dummy package...
> 
> Probably, it could be useful to try trixie/bookworm cross-building
> outside of isar to get clear understanding if sbuild itself is in blame
> or the way we use it is incorrect.
> 
> 

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