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[Seyeong Kim <seyeong.kim@xxxxxxxxxxxxx>]

no that code is from nagios charm not nrpe charm

full traceback is below

2017-09-01 01:47:50 INFO config-changed Traceback (most recent call last):
2017-09-01 01:47:50 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 339, in <module>
2017-09-01 01:47:50 INFO config-changed     update_config()
2017-09-01 01:47:50 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 231, in update_config
2017-09-01 01:47:50 INFO config-changed     for relunit in self[self.name]:
2017-09-01 01:47:50 INFO config-changed NameError: global name 'self' is not defined
2017-09-01 01:47:50 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1
2017-09-01 01:47:56 WARNING juju-log Please use the generic juju-info or the monitors interface
2017-09-01 01:47:56 DEBUG juju-log Writing file /etc/nagios3/conf.d/extra.cfg root:root 444
2017-09-01 01:47:56 INFO config-changed Traceback (most recent call last):
2017-09-01 01:47:56 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 339, in <module>
2017-09-01 01:47:56 INFO config-changed     update_config()
2017-09-01 01:47:56 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 231, in update_config
2017-09-01 01:47:56 INFO config-changed     for relunit in self[self.name]:
2017-09-01 01:47:56 INFO config-changed NameError: global name 'self' is not defined
2017-09-01 01:47:56 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1
2017-09-01 01:48:07 WARNING juju-log Please use the generic juju-info or the monitors interface
2017-09-01 01:48:07 DEBUG juju-log Writing file /etc/nagios3/conf.d/extra.cfg root:root 444
2017-09-01 01:48:07 INFO config-changed Traceback (most recent call last):
2017-09-01 01:48:07 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 339, in <module>
2017-09-01 01:48:07 INFO config-changed     update_config()
2017-09-01 01:48:07 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 231, in update_config
2017-09-01 01:48:07 INFO config-changed     for relunit in self[self.name]:
2017-09-01 01:48:07 INFO config-changed NameError: global name 'self' is not defined
2017-09-01 01:48:07 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1
2017-09-01 01:48:28 WARNING juju-log Please use the generic juju-info or the monitors interface
2017-09-01 01:48:28 DEBUG juju-log Writing file /etc/nagios3/conf.d/extra.cfg root:root 444
2017-09-01 01:48:28 INFO config-changed Traceback (most recent call last):
2017-09-01 01:48:28 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 339, in <module>
2017-09-01 01:48:28 INFO config-changed     update_config()
2017-09-01 01:48:28 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 231, in update_config
2017-09-01 01:48:28 INFO config-changed     for relunit in self[self.name]:
2017-09-01 01:48:28 INFO config-changed NameError: global name 'self' is not defined
2017-09-01 01:48:29 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1
2017-09-01 01:49:09 WARNING juju-log Please use the generic juju-info or the monitors interface
2017-09-01 01:49:09 DEBUG juju-log Writing file /etc/nagios3/conf.d/extra.cfg root:root 444
2017-09-01 01:49:09 INFO config-changed Traceback (most recent call last):
2017-09-01 01:49:09 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 339, in <module>
2017-09-01 01:49:09 INFO config-changed     update_config()
2017-09-01 01:49:09 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 231, in update_config
2017-09-01 01:49:09 INFO config-changed     for relunit in self[self.name]:
2017-09-01 01:49:09 INFO config-changed NameError: global name 'self' is not defined
2017-09-01 01:49:09 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1
2017-09-01 01:50:28 WARNING juju-log Please use the generic juju-info or the monitors interface
2017-09-01 01:50:28 DEBUG juju-log Writing file /etc/nagios3/conf.d/extra.cfg root:root 444
2017-09-01 01:50:29 INFO config-changed Traceback (most recent call last):
2017-09-01 01:50:29 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 339, in <module>
2017-09-01 01:50:29 INFO config-changed     update_config()
2017-09-01 01:50:29 INFO config-changed   File "/var/lib/juju/agents/unit-nagios-0/charm/hooks/config-changed", line 231, in update_config
2017-09-01 01:50:29 INFO config-changed     for relunit in self[self.name]:
2017-09-01 01:50:29 INFO config-changed NameError: global name 'self' is not defined
2017-09-01 01:50:29 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1

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https://bugs.launchpad.net/bugs/1712977

Title:
  config-changed hook fails: nrpe_helpers.py:nagios_hostname in
  _metadata_unit with FileNotFoundError error for metadata.yaml of
  related unit on another host

Status in Charm Helpers:
  Fix Released
Status in Nagios Charm:
  Fix Released
Status in NRPE Charm:
  Fix Released

Bug description:
  Due to recent changes, nrpe_helpers.py:nagios_hostname calls
  charmhelpers.core.hookenv.principal_unit to get the parent unit's
  hostname.

  On Juju 2.1 or earlier, it does this by walking all relations of the
  unit and inspecting it's metadata file using _metadata_unit.

  This fails because it attempts to inspect units on another host, i.e.
  the parent nagios unit and _metadata_unit fires a FileNotFoundError
  exception for the file that doesn't exist.

  You can simulate this on Juju 2.2 by commenting out the Juju 2.2
  checks at the start and deploying the nagios and nrpe charms on
  separate machines.

  
  Traceback (most recent call last):
    File "/var/lib/juju/agents/unit-nrpe-0/charm/hooks/config-changed", line 3, in <module> 
      services.manage()
    File "/var/lib/juju/agents/unit-nrpe-0/charm/hooks/services.py", line 27, in manage
      nrpe_helpers.NagiosInfo(),
    File "/var/lib/juju/agents/unit-nrpe-0/charm/hooks/nrpe_helpers.py", line 202, in __init__
      self['nagios_hostname'] = self.principle_relation.nagios_hostname()
    File "/var/lib/juju/agents/unit-nrpe-0/charm/hooks/nrpe_helpers.py", line 163, in nagios_hostname
      principle_unitname = hookenv.principal_unit()
    File "/var/lib/juju/agents/unit-nrpe-0/charm/hooks/charmhelpers/core/hookenv.py", line 219, in principal_unit 
      md = _metadata_unit(unit)
    File "/var/lib/juju/agents/unit-nrpe-0/charm/hooks/charmhelpers/core/hookenv.py", line 513, in _metadata_unit 
      with open(os.path.join(basedir, unitdir, 'charm', 'metadata.yaml')) as md:
  FileNotFoundError: [Errno 2] No such file or directory: '/var/lib/juju/agents/unit-nagios-0/charm/metadata.yaml'

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