[Bug 1947810] Re: autopkgtest-satdep.deb unpack fails on Debian images

[Athos Ribeiro]

A possible solution here would be to force the dpkg-deb operation to use
a different compression format until https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=892664 gets sorted out (patch proposal attached).

This would enable developers running Ubuntu to perform autopkgtest tests
against Debian before submitting patches there.

A PPA with the proposed patch is available at
https://launchpad.net/~athos-ribeiro/+archive/ubuntu/autopkgtest-
zstd/+packages

** Bug watch added: Debian Bug tracker #892664
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892664

** Patch added: "1-5.17ubuntu1.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/autopkgtest/+bug/1947810/+attachment/5534460/+files/1-5.17ubuntu1.debdiff

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https://bugs.launchpad.net/bugs/1947810

Title:
  autopkgtest-satdep.deb unpack fails on Debian images

Status in autopkgtest package in Ubuntu:
  New

Bug description:
  Since impish, dpkg defaults to the zstd compression format for
  compressing the members in a deb package archive [1,2].

  However Debian zstd support efforts are still in progress [3].

  Therefore, running autopkgtest from an Ubuntu (>= 21.10) host on a
  Debian target fails, since autopkgtest uses dpkg-deb to generate the
  autopkgtest-satdep.deb package.

  For instance, running the following commands for a given package

  $ autopkgtest-build-lxd images:debian/sid
  $ autopkgtest ./. -- lxd autopkgtest/debian/sid/amd64

  results in the following error:

  autopkgtest [18:32:17]: build needed for binaries
  autopkgtest [18:32:24]: ERROR: "dpkg --unpack /tmp/autopkgtest.4vFMyL/1-autopkgtest-satdep.deb" failed with stderr "dpkg-deb: error: archive '/tmp/autopkgtest.4vFMyL/1-autopkgtest-satdep.deb' uses unknown compression for member 'control.tar.zst', giving up
  dpkg: error processing archive /tmp/autopkgtest.4vFMyL/1-autopkgtest-satdep.deb (--unpack):
   dpkg-deb --control subprocess returned error exit status 2
  Errors were encountered while processing:
   /tmp/autopkgtest.4vFMyL/1-autopkgtest-satdep.deb

  [1] https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/1923845
  [2] https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/1923845/comments/34
  [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892664

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