[Bug 1821103] Re: [SRU] Skip sending email when no package had to be installed, upgraded or removed

[Balint Reczey]

Verified on Cosmic, Bionic and Xenial:

unattended-upgrades/1.5ubuntu3.18.10.4

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-cosmic/cosmic/amd64/u/unattended-upgrades/20190430_104715_aa4ef@/log.gz
...
Checking that no email is sent when nothing had to be done...OK
...

unattended-upgrades/1.1ubuntu1.18.04.11

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/amd64/u/unattended-upgrades/20190430_110349_c430a@/log.gz
...
Checking that no email is sent when nothing had to be done...OK
...

unattended-upgrades/1.1ubuntu1.18.04.7~16.04.3

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/amd64/u/unattended-upgrades/20190430_113753_93138@/log.gz
...
Checking that no email is sent when nothing had to be done...OK
...


** Tags removed: verification-needed verification-needed-bionic verification-needed-cosmic verification-needed-xenial
** Tags added: verification-done verification-done-bionic verification-done-cosmic verification-done-xenial

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https://bugs.launchpad.net/bugs/1821103

Title:
  [SRU] Skip sending email when no package had to be installed, upgraded
  or removed

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 Cosmic:
  Fix Committed
Status in unattended-upgrades package in Debian:
  Fix Released

Bug description:
  [Impact]

   * Users get unattended-upgrade's email report every day or every time u-u ran, even when no package needed to be upraded, installed or removed. This can annoy administrators managing many servers.
   * The fix is sending the report email only when there were actions taken by u-u.

  [Test Case]

   * The extended autopkgtest script checks if no email is sent when u-u
  did not upgrade packages.

  [Regression Potential]

   * Unattended-upgrades may skip sending emails which would contain
  useful information, but given the size and the simplicity of the
  scripts this seems unlikely.

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