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[Launchpad Bug Tracker <1845037@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package autopkgtest - 5.3.1ubuntu1.1

---------------
autopkgtest (5.3.1ubuntu1.1) bionic; urgency=medium

  * setup-testbed: Set Always-Include-Phased-Updates for apt (LP:
#1934100)

autopkgtest (5.3.1ubuntu1) bionic; urgency=medium

  * tools/autopkgtest-build-lxd: pass /dev/null on stdin to lxc launch
    (LP: #1845037)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Wed, 30 Jun 2021 10:39:03
+0200

** Changed in: autopkgtest (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1845037

Title:
  autopkgtest package "lxd" test has started failing

Status in autopkgtest package in Ubuntu:
  Fix Released
Status in autopkgtest source package in Xenial:
  Fix Committed
Status in autopkgtest source package in Bionic:
  Fix Released
Status in autopkgtest source package in Disco:
  Won't Fix
Status in autopkgtest source package in Eoan:
  Fix Released

Bug description:
  [impact]

  "lxd launch" behavior recently changed to parse any queued input on
  stdin and process it as a yaml file.

  Since the "autopkgtest-build-lxd" script calls "lxd launch", and input
  queued to stdin when calling "autopkgtest-build-lxd" will cause the
  internal call to lxd to fail, such as calling "autopkgtest-build-lxd"
  from inside a here document (see test case below).

  the failure is seen in (at least) the "lxd" autopkgtest from the autopkgtest package itself, e.g.:
  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-disco/disco/amd64/a/autopkgtest/20190923_160817_66dbe@/log.gz

  [test case]

  root@autopkgtest:~# cat <<EOF | su - ubuntu
  > autopkgtest-build-lxd ubuntu:bionic
  > echo ok done
  > EOF
  Error: yaml: unmarshal errors:
    line 1: cannot unmarshal !!str `echo ok...` into api.ContainerPut

  run the autopkgtests for the package 'autopkgtest', or check autopkgtest.ubuntu.com, e.g.:
  http://autopkgtest.ubuntu.com/packages/a/autopkgtest/disco/amd64
  http://autopkgtest.ubuntu.com/packages/a/autopkgtest/disco/i386
  http://autopkgtest.ubuntu.com/packages/a/autopkgtest/eoan/amd64
  http://autopkgtest.ubuntu.com/packages/a/autopkgtest/eoan/i386

  the autopkgtest test case is failing only for disco and eoan, and only
  for amd64/i386 as the 'lxd' test is skipped for non-intel archs.

  the autopkgtest test case does not fail on bionic or xenial, because the tests there run with the lxd deb, which is still at the older version.
  http://autopkgtest.ubuntu.com/packages/a/autopkgtest/bionic/amd64

  However, the lxd snap can be installed in xenial or bionic, and the
  failure is reproducable when the lxd snap is installed, i.e.:

  $ sudo apt remove lxd
  $ sudo snap install lxd
  ...perform test case

  [regression potential]

  this only redirects stdin from /dev/null, for the call to 'lxc launch'
  inside autopkgtest-build-lxd; so the regression potential should be
  low.  Any regressions would almost certainly involve a failure during
  the call to autopkgtest-build-lxd, during the creation of the lxd
  container.

  [other info]

  this is reproducable with the current packages from disco-updates
  using a local qemu vm for testing.

  note that the autopkgtest fails only for disco and eoan, becuase on
  xenial and bionic the lxd deb is used, which still has the older
  behavior, however the lxd snap is available to install on both xenial
  and bionic, so this problem still exists for both those releases, as
  well as disco and eoan.

  also, this is not just a testcase failure - this is actual new
  behavior that can break existing users of the "autopkgtest-build-lxd"
  script in the manner described in the test case.

  I put the 'importance' of this as low because this bug will only be
  reproduced when calling autopkgtest-build-lxd from inside a here
  document passed to a shell, or otherwise called with input queued on
  stdin, which seems like an unusual way to call autopkgest-build-lxd,
  although still a perfectly valid way to use it.

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