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[Launchpad Bug Tracker <1880211@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package logwatch - 7.5.5-1ubuntu2

---------------
logwatch (7.5.5-1ubuntu2) hirsute; urgency=medium

  * d/p/0010-zz-zfs-detect-zfs-location.patch: Use explicit paths for
    finding zfs and zpool executables.
    (LP: #1880211)

 -- Bryce Harrington <bryce@xxxxxxxxxxxxx>  Wed, 14 Apr 2021 20:11:05
+0000

** Changed in: logwatch (Ubuntu)
       Status: In Progress => Fix Released

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Title:
  Logwatch package points to wrong location for zfs utils

Status in logwatch package in Ubuntu:
  Fix Released
Status in logwatch source package in Xenial:
  In Progress
Status in logwatch source package in Bionic:
  In Progress
Status in logwatch source package in Focal:
  In Progress
Status in logwatch source package in Groovy:
  In Progress

Bug description:
  [Impact]
  Logwatch fails to print info for ZFS due to invalid paths to binaries.

  [Test Case]
  With ZFS installed, run logwatch and note the missing ZFS information.

  $ sudo apt-get install zfsutils-linux
  $ sudo logwatch --detail Low --range all --service zz-zfs --output stdout

  In the bugged version, this produces no output.

  With a successful configuration, you will see something such as:

   --------------------- ZFS Report Begin ------------------------

   /dev/zfs and /proc/self/mounts are required.
   Try running 'udevadm trigger' and 'mount -t proc proc /proc' as root.
   
   ---------------------- ZFS Report End ------------------------- 

  [Regression Potential]
  Since logwatch filters logs for errors pertinent to administrators,
  standard things to watch out for are undesired changes in this filtering
  behavior, such as flagging or failing to flag issues differently than
  before, other than the specific messages being filtered with this
  change.

  [Discussion]
  In /usr/share/logwatch/scripts/services/zz-zfs line 54 and 55 are the following.
  my $pathto_zpool = $ENV{'pathto_zpool'} || '/usr/sbin/zpool';
  my $pathto_zfs   = $ENV{'pathto_zfs'}   || '/usr/sbin/zfs';

  In Ubuntu, the zfs utilities are in /sbin, not /usr/sbin. This causes
  logwatch to not print info for ZFS even if you're using it.

  The fix is just to point to /sbin instead. This is what fixed it for
  me.

  my $pathto_zpool = $ENV{'pathto_zpool'} || '/sbin/zpool';
  my $pathto_zfs   = $ENV{'pathto_zfs'}   || '/sbin/zfs';

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