[Bug 1878955] Autopkgtest regression report (systemd/237-3ubuntu10.44)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted systemd (237-3ubuntu10.44) for bionic have finished running.
The following regressions have been reported in tests triggered by the package:

linux-azure-4.15/4.15.0-1104.116 (amd64)
munin/2.0.37-1ubuntu0.1 (arm64)
gvfs/1.36.1-0ubuntu1.3.3 (amd64)
libvirt/4.0.0-1ubuntu8.17 (i386)
apt/1.6.12ubuntu0.2 (armhf)
netplan.io/0.99-0ubuntu3~18.04.3 (amd64)
linux-hwe-5.0/5.0.0-63.69 (armhf)
openssh/1:7.6p1-4ubuntu0.3 (armhf, s390x, ppc64el, arm64, i386, amd64)
corosync/2.4.3-0ubuntu1.1 (armhf)
nut/2.7.4-5.1ubuntu2 (i386)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/bionic/update_excuses.html#systemd

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1878955

Title:
  resolved dhclient-enter-hook complains about an empty file

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  Fix Committed
Status in systemd source package in Focal:
  Fix Committed

Bug description:
  [impact]

  When starting/using `dhclient`, it will often return an error such as:

      cmp: EOF on /tmp/tmp.yCyV6zBzhB which is empty

  [test case]

  run dhclient for the first time (for the current boot) on a
  bionic/focal system, or remove the file(s) in
  /run/systemd/resolved.conf.d/ starting with 'isc-dhcp-*', and then run
  dhclient.

  [regression potential]

  any regression would likely cause the DNS configuration that dhclient
  gets to not be properly reported to systemd-resolved, resulting in
  problematic/broken systemd DNS resolution.

  [scope]

  this is needed in b/f

  this hook was removed from systemd starting in g, and the hook was not
  yet added in x, so this change is needed only in b and f.

  [original description]

  When starting/using `dhclient`, it will often return an error such as:

      cmp: EOF on /tmp/tmp.yCyV6zBzhB which is empty

  This is due to the use of `cmp` in "/etc/dhcp/dhclient-enter-
  hooks.d/resolved"

  Because the $oldstate file can be empty, or different, it should use
  `cmp --quiet`

  This happens when "/run/systemd/resolved.conf.d/isc-
  dhcp-v*-$interface.conf" files do not exist, or when the content
  changes.

  This is very loosely related to
  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1805183

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