[Bug 2120936] Re: logrotate returns an error if mysql service is disabled

[Simon Chopin]

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https://bugs.launchpad.net/bugs/2120936

Title:
  logrotate returns an error if mysql service is disabled

Status in mysql-8.0 package in Ubuntu:
  New
Status in mysql-8.4 package in Ubuntu:
  Fix Released
Status in mysql-8.0 source package in Jammy:
  Fix Released
Status in mysql-8.0 source package in Noble:
  Fix Released
Status in mysql-8.4 source package in Plucky:
  Fix Released
Status in mysql-8.4 source package in Questing:
  Fix Released

Bug description:
  [Description]

  After the MR part of this bug report:
  https://bugs.launchpad.net/ubuntu/+source/mysql-8.0/+bug/1850980

  logrotate returns an error when running the mysql log rotation script
  if the mysql service is disabled.

  It is expected of logrotate not to return an error if the service is disabled since a disabled service will not generate logs to rotate anyways.
  I have written a fix that checks first the status of the mysql service before running the rest of the log rotate script.

  [Test Plan]

  Run the following commands, and verify the output of logrotate:

  $ sudo apt install mysql-server

  $ sudo systemctl stop mysql.service

  $ sudo logrotate -f /etc/logrotate.conf

  If no error is returned by logrotate it means the fix was successful,
  else the following error is shown:

  error: error running shared postrotate script for '/var/log/mysql.log
  /var/log/mysql/*log '

  
  [Where problems could occur]

  Since the changes is related to logs, possible issues may be that the script falsely detects that the mysql service is disabled and not rotate the logs.
  Any problems resulting from this patch are expected to only be limited to log rotation.

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