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

[Athos Ribeiro]

** Changed in: autopkgtest (Ubuntu Impish)
     Assignee: (unassigned) => Athos Ribeiro (athos-ribeiro)

** Changed in: autopkgtest (Ubuntu Impish)
   Importance: Undecided => Medium

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

Status in autopkgtest package in Ubuntu:
  Fix Released
Status in autopkgtest source package in Impish:
  New

Bug description:
  [Impact]

  dpkg defaults to the zstd compression format for compressing the
  members in a deb package archive. This compression format is not
  supported in Debian. 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.

  [Test Plan]

  For any package with dep8 tests, run

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

  and verify it fails with:

  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

  Then, upgrade the package to the version with the proposed fix and re-
  run the tests

  $ autopkgtest ./. -- lxd autopkgtest/debian/sid/amd64

  Finally, verify the error no longer occurs.

  [Where problems could occur]

  We will be enforcing the xz compression format. While this is
  available in dpkg throughout all supported Ubuntu releases, this could
  become an issue for targets that do not support such compression
  format. In this case, the  change would need to be reverted or changed
  to a compression format supported by older versions of dpkg (i.e.,
  gz).

  [Other Info]
   
  This have been fixed in jammy on 5.19.

  [Original message]

  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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