[Bug 1848354] Re: upgrade-between-snapshots autopkgtest is flaky

[Balint Reczey]

Tested unattended-upgrades/1.10ubuntu5.2 on Disco:

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-disco/disco/amd64/u/unattended-
upgrades/20191025_130642_9d5e1@/log.gz

...
E: Failed to fetch http://snapshot.debian.org/archive/debian/20171001T000000Z/pool/main/p/python3.5/python3.5_3.5.4-4_amd64.deb  503  Service Unavailable
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
autopkgtest [13:06:31]: test upgrade-between-snapshots: -----------------------]
upgrade-between-snapshots FLAKY non-zero exit status 100
autopkgtest [13:06:31]: test upgrade-between-snapshots:  - - - - - - - - - - results - - - - - - - - - -
autopkgtest [13:06:31]: @@@@@@@@@@@@@@@@@@@@ summary
run-tests            PASS
test-systemd.py      PASS
upgrade-all-security PASS
upgrade-between-snapshots FLAKY non-zero exit status 100
...

** Tags removed: verification-needed verification-needed-disco
** Tags added: verification-done verification-done-disco

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https://bugs.launchpad.net/bugs/1848354

Title:
  upgrade-between-snapshots autopkgtest is flaky

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Xenial:
  Fix Committed
Status in unattended-upgrades source package in Bionic:
  Fix Committed
Status in unattended-upgrades source package in Disco:
  Fix Committed
Status in unattended-upgrades source package in Eoan:
  Fix Committed

Bug description:
  [Impact]

   * Flaky upgrade-between-snapshots autopkgtest prevents developers to
  use the test efficiently.

  [Test Case]

   * Run autopkgtests, observe the upgrade-between-snapshots test
  passing or failing but being marked as FLAKY.

  [Regression Potential]

   * None, the test was failing often due to connectivity/internal
  errors of snapshot.debian.org.

  [Other Info]

   * The whole autopkgtest is marked to be failing on amd64 to mitigate
  the single flaky test, this marking can be removed after marking this
  single flaky test.

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