Bug#1109327: sbuild: unshare backend does not work with Debian Ports architectures

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

Source: sbuild
Version: 0.89.3
Severity: normal
User: debian-powerpc@lists.debian.org
Usertags: powerpc
X-Debbugs-Cc: debian-powerpc@lists.debian.org

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