[Bug 1570813] [NEW] Executing "systemctl is-enabled tmp.mount ; echo $?" returns 0 on an error

[Sworddragon]

Public bug reported:

I'm using Ubuntu 16.04 dev with systemd 229-4ubuntu4 and figured out by
this report (
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1545707 ) if
executing "systemctl is-enabled tmp.mount ; echo $?" fails 0 is returned
as shown in this example:

root at ubuntu:~# systemctl is-enabled tmp.mount ; echo $?
Failed to get unit file state for tmp.mount: No such file or directory
0

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1570813

Title:
  Executing "systemctl is-enabled tmp.mount ; echo $?" returns 0 on an
  error

Status in systemd package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 16.04 dev with systemd 229-4ubuntu4 and figured out
  by this report (
  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1545707 ) if
  executing "systemctl is-enabled tmp.mount ; echo $?" fails 0 is
  returned as shown in this example:

  root at ubuntu:~# systemctl is-enabled tmp.mount ; echo $?
  Failed to get unit file state for tmp.mount: No such file or directory
  0

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