[Bug 1878955] Re: resolved dhclient-enter-hook complains about an empty file

[Chris Halse Rogers]

Hello Craig, or anyone else affected,

Accepted systemd into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/245.4-4ubuntu3.4 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: systemd (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-focal

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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:
  In Progress
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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