XPost: linux.debian.ports.powerpc

Source: sbuild
Version: 0.89.3
Severity: normal
User: [email protected]
Usertags: powerpc
X-Debbugs-Cc: [email protected]

Hello,

I just tried the unshare backend in Debian Ports for the first time.

After adding the subuids and subgids, I could start the build but it immediately
failed as the FTP server used for mmdebstrap does not support the Debian Ports architecture powerpc:

buildd@kapitsa:/srv/debian$ export export DEB_BUILD_OPTIONS="nobench nocheck parallel=16" ; sbuild -d sid --arch=powerpc --apt-update --nolog --no-arch-all --chroot-mode=unshare xbill_2.1-10.dsc
I: consider moving your ~/.sbuildrc to /var/lib/buildd/.config/sbuild/config.pl The Debian buildds switched to the "unshare" backend and sbuild will default to it in the future.
To start using "unshare" add this to your `~/.config/sbuild/config.pl`:
$chroot_mode = "unshare";
If you want to keep the old "schroot" mode even in the future, add the following to your `~/.config/sbuild/config.pl`:
$chroot_mode = "schroot";
$schroot = "schroot";
sbuild (Debian sbuild) 0.89.3 (07 June 2025) on kapitsa.east.ru

+==============================================================================+
| xbill 2.1-10 (powerpc) Tue, 15 Jul 2025 08:50:10 +0000 |
+==============================================================================+

Package: xbill
Version: 2.1-10
Source Version: 2.1-10
Distribution: sid
Machine Architecture: powerpc
Host Architecture: powerpc
Build Architecture: powerpc
Build Type: any

I: No tarballs found in /var/lib/buildd/.cache/sbuild
I: Creating chroot on-demand by running:
mmdebstrap --variant=buildd --arch=powerpc --skip=output/mknod --format=tar sid -
I: Unpacking tarball from STDIN to /tmp/tmp.sbuild.LvUBjxhvIo...
I: automatically chosen mode: unshare
I: chroot architecture powerpc is equal to the host's architecture
I: finding correct signed-by value...
I: using /tmp/mmdebstrap.HvItBoJYL4 as tempdir
I: skipping output/mknod as requested for ./dev/console
I: skipping output/mknod as requested for ./dev/full
I: skipping output/mknod as requested for ./dev/null
I: skipping output/mknod as requested for ./dev/ptmx
I: skipping output/mknod as requested for ./dev/random
I: skipping output/mknod as requested for ./dev/tty
I: skipping output/mknod as requested for ./dev/urandom
I: skipping output/mknod as requested for ./dev/zero
I: running apt-get update...
W: apt-get indextargets output is empty
I: Type: one-line
I: Content:
I: deb http://deb.debian.org/debian sid main
I: Package files:
I: 100 /tmp/mmdebstrap.HvItBoJYL4/var/lib/dpkg/status
I: release a=now
I: Pinned packages:
E: apt-get update did not find any indices for architecture 'powerpc' in suite 'sid'
W: hooklistener errored out: E: received eof on socket

I: main() received signal PIPE: waiting for setup...
I: removing tempdir /tmp/mmdebstrap.HvItBoJYL4...
E: mmdebstrap failed to run
tar: This does not look like a tar archive
mmdebstrap failed
tar: Exiting with failure status due to previous errors
E: auto-creating chroot failed
E: Error creating chroot session: skipping xbill

+------------------------------------------------------------------------------+
| Summary Tue, 15 Jul 2025 08:50:12 +0000 |
+------------------------------------------------------------------------------+

Build Architecture: powerpc
Build Type: any
Build-Space: 0
Build-Time: 0
Distribution: sid
Fail-Stage: create-session
Host Architecture: powerpc
Install-Time: 0
Job: /srv/debian/xbill_2.1-10.dsc
Machine Architecture: powerpc
Package: xbill
Package-Time: 0
Source-Version: 2.1-10
Space: 0
Status: failed
Version: 2.1-10 --------------------------------------------------------------------------------
Finished at 2025-07-15T08:50:10Z
Build needed 00:00:00, 0k disk space
E: Error creating chroot session: skipping xbill
buildd@kapitsa:/srv/debian$

Thanks,
Adrian

--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer
`. `' Physicist
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913

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Hi,

as agreed with Adrian, here is what we just talked about in #debconf-grandamphi

Quoting John Paul Adrian Glaubitz (2025-07-15 10:57:24)

I just tried the unshare backend in Debian Ports for the first time.

After adding the subuids and subgids, I could start the build but it immediately
failed as the FTP server used for mmdebstrap does not support the Debian Ports
architecture powerpc:

11:13 < cbmuser> josch: Can you add out-of-the-box support for Debian Ports? Currently mmdebstrap fails
for non-release architectures.
11:15 < josch> cbmuser: yes, i saw your bug -- the bigger problem is: how to automatically create chroots
for distros other than debian main
11:15 < josch> we could hack in all sorts of exceptions into the code for that 11:15 < josch> but i'd like this to be part of distro-info-data
11:15 < josch> and then mmdebstrap could just query the distro-info-data information for the requested
arch/release and do the right thing
11:16 < josch> cbmuser: juliank is working on improving distro-info-data to include this information
11:16 < josch> so essentially, the answer is: yes, i'd like to do that and it will get done once i find
the time and patches welcome :)
11:16 < josch> the plan is to move away from hard-coding exceptions and instead use machine-readable
tables from distro-info-data (which do not exist yet)
11:16 < cbmuser> josch: Well, for Debian Ports, you just need to use a different URL, that's all.
11:17 < josch> yes
11:17 < josch> but which different url
11:17 < cbmuser> And since qemu-user seems to be supported with the --arch= option, that should work.
11:17 < josch> it would be yet another if(...) in the code
11:17 < josch> that's what i mean with hardcoding
11:17 < josch> yes it would
11:17 < josch> but i'd like to use machine-readable data as the source for this 11:17 < cbmuser> josch: http://deb.debian.org/debian-ports
11:17 < josch> because debian-ports is not the only distro with this problem 11:17 < josch> cbmuser: yes, i know the url
11:17 < josch> but i would not like to hardcode it
11:17 < josch> i would like to have a solution that uses centrally managed information about the mirror
url
11:18 < josch> and that information should be in distro-info-data
11:18 < josch> it is not yet but juliank is working on it
11:18 < josch> if you find the time, you can help working on making that happen 11:18 < cbmuser> josch: https://salsa.debian.org/mirror-team/masterlist
11:19 < josch> cbmuser: so you propose that sbuild does a HTTP GET query every time it runs to figure out
the mapping?
11:19 < josch> cbmuser: would you not say that storing this in a local package like distor-info-data so
that you can build even without an internet connection is the better option?
11:19 < cbmuser> No, I was not proposing fetching that data from the web, of course ;-)
11:20 < cbmuser> I was just saying we have such a centrally managed list already.
11:20 < josch> yes, now we need to put it somewhere that is packaged, like distro-info-data
11:20 < cbmuser> d-i has choose-mirror which uses this, so we could also put this into a deb package.
11:21 < josch> whichever way the information is stored, once it is in a .deb i will modify mmdebstrap to
query that information and do the right thing
11:21 < josch> cbmuser: maybe talk with juliank as he has some plans
11:22 < cbmuser> Sounds like a good idea.
11:22 < josch> cbmuser: mind if i copypaste our conversation just now into the bug to not loose track of
the current state?
11:22 < cbmuser> Please go ahead.
11:22 < josch> thanks
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