[Bug 1981042] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for systemd has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1981042

Title:
  /etc/localtime symlink not correctly handled when using /etc/writable

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Jammy:
  Fix Released
Status in systemd source package in Kinetic:
  Fix Released

Bug description:
  [Impact]
  When using /etc/writable (e.g. Ubuntu Core) /etc/localtime is a symlink to /etc/writable/localtime (which in itself if a symlink). Systemd doesn't handle this correctly when doing firstboot or using inotify to watch for changes to localtime.

  [Test Plan]
  This is somewhat hard to test, the following situations need to be reproduced:
  - On firstboot the timezone link will not be read correctly, it will with this change.
  - Starting a timer unit and then changing timezone will cause it not to occur at the correct time.

  [Where problems could occur]
  This could potentially break other users of localtime, however the change is similar to existing changes which have been in Ubuntu's version of systemd for some time. The change detects the /etc/writable case and if not should have the same existing behaviour.

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