** Tags added: canonical-bootstack
** Also affects: nagios-charm
Importance: Undecided
Status: New
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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:
Confirmed
Status in Nagios Charm:
New
Status in NRPE Charm:
Confirmed
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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