[Bug 1865037] Re: make the service fail gracefully if unable to load modules

[Rafael David Tinoco]

** Changed in: python-rtslib-fb (Ubuntu)
     Assignee: Rafael David Tinoco (rafaeldtinoco) => (unassigned)

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https://bugs.launchpad.net/bugs/1865037

Title:
  make the service fail gracefully if unable to load modules

Status in rtslib-fb:
  Unknown
Status in python-rtslib-fb package in Ubuntu:
  Triaged

Bug description:
  The LIO interfaces is inherently tied to the kernel.
  That makes the service fail on e.g. a container install:

  See "systemctl status rtslib-fb-targetctl.service" and "journalctl -xe" for details.
  root at f:~# systemctl status rtslib-fb-targetctl.service
  ● rtslib-fb-targetctl.service - Restore LIO kernel target configuration
       Loaded: loaded (/lib/systemd/system/rtslib-fb-targetctl.service; disabled; vendor preset: enabled)
       Active: failed (Result: exit-code) since Thu 2020-02-27 14:10:35 UTC; 3s ago
      Process: 23831 ExecStart=/usr/bin/mkdir -p /etc/rtslib-fb-target (code=exited, status=0/SUCCESS)
      Process: 23832 ExecStart=/usr/bin/targetctl restore (code=exited, status=1/FAILURE)
     Main PID: 23832 (code=exited, status=1/FAILURE)

  Feb 27 14:10:35 f target[23832]:   File "/usr/bin/targetctl", line 47, in restore
  Feb 27 14:10:35 f target[23832]:     errors = RTSRoot().restore_from_file(restore_file=from_file)
  Feb 27 14:10:35 f target[23832]:   File "/usr/lib/python3/dist-packages/rtslib_fb/root.py", line 85, in __init__
  Feb 27 14:10:35 f target[23832]:     modprobe('target_core_mod')
  Feb 27 14:10:35 f target[23832]:   File "/usr/lib/python3/dist-packages/rtslib_fb/utils.py", line 428, in modprobe
  Feb 27 14:10:35 f target[23832]:     raise RTSLibError(stderrdata)
  Feb 27 14:10:35 f target[23832]: rtslib_fb.utils.RTSLibError: b"modprobe: ERROR: ../libkmod/libkmod.c:611 kmod_search_moddep() could not open moddep file '/lib/modules/5.3.0-40-generic/modu>
  Feb 27 14:10:35 f systemd[1]: rtslib-fb-targetctl.service: Main process exited, code=exited, status=1/FAILURE
  Feb 27 14:10:35 f systemd[1]: rtslib-fb-targetctl.service: Failed with result 'exit-code'.
  Feb 27 14:10:35 f systemd[1]: Failed to start Restore LIO kernel target configuration.

  
  It is ok that this doesn't work in a container, but it also breaks the package installation status which should be avoided.

  Until a more fine grained detection is developed that could be as easy as adding:
    ConditionVirtualization=!container

  That would let the package install, but not start the service (knowing
  it would fail).

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