Temporal system status traceback

[Adam Collard]

As seen in system-tests for the deb

twisted.internet.defer: [critical] Unhandled error in Deferred:
twisted.internet.defer: [critical]
        Traceback (most recent call last):
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1750, in gotResult
            current_context.run(_inlineCallbacks, r, gen, status)
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1660, in _inlineCallbacks
            result = current_context.run(gen.send, result)
          File "/usr/lib/python3/dist-packages/maasserver/eventloop.py", line 271, in startService
            [maybeDeferred(service.startService) for service in self]
          File "/usr/lib/python3/dist-packages/maasserver/eventloop.py", line 271, in <listcomp>
            [maybeDeferred(service.startService) for service in self]
        --- <exception caught here> ---
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 190, in maybeDeferred
            result = f(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/regiondservices/temporal.py", line 30, in startService
            self._configure()
          File "/usr/lib/python3/dist-packages/maasserver/regiondservices/temporal.py", line 71, in _configure
            atomic_write(rendered, target_path, overwrite=True, mode=0o644)
          File "/usr/lib/python3/dist-packages/provisioningserver/utils/fs.py", line 136, in atomic_write
            temp_file = _write_temp_file(content, filename)
          File "/usr/lib/python3/dist-packages/provisioningserver/utils/fs.py", line 94, in _write_temp_file
            temp_fd, temp_file = tempfile.mkstemp(
          File "/usr/lib/python3.10/tempfile.py", line 480, in mkstemp
            return _mkstemp_inner(dir, prefix, suffix, flags, output_type)
          File "/usr/lib/python3.10/tempfile.py", line 395, in _mkstemp_inner
            fd = _os.open(file, flags, 0o600)
        builtins.PermissionError: [Errno 13] Permission denied: '/var/lib/maas/temporal/.production.yaml.lx9jzl8a.tmp'

followed by

twisted.internet.defer: [critical]
        Traceback (most recent call last):
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 700, in errback
            self._startRunCallbacks(fail)
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 763, in _startRunCallbacks
            self._runCallbacks()
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 857, in _runCallbacks
            current.result = callback( # type: ignore[misc]
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1750, in gotResult
            current_context.run(_inlineCallbacks, r, gen, status)
        --- <exception caught here> ---
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1656, in _inlineCallbacks
            result = current_context.run(
          File "/usr/lib/python3/dist-packages/twisted/python/failure.py", line 489, in throwExceptionIntoGenerator
            return g.throw(self.type, self.value, self.tb)
          File "/usr/lib/python3/dist-packages/maasserver/regiondservices/temporal_worker.py", line 51, in startService
            status = yield service_monitor.getServiceState(
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1656, in _inlineCallbacks
            result = current_context.run(
          File "/usr/lib/python3/dist-packages/twisted/python/failure.py", line 489, in throwExceptionIntoGenerator
            return g.throw(self.type, self.value, self.tb)
          File "/usr/lib/python3/dist-packages/provisioningserver/utils/service_monitor.py", line 305, in getServiceState
            active_state, process_state = yield self._loadServiceState(service)
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1660, in _inlineCallbacks
            result = current_context.run(gen.send, result)
          File "/usr/lib/python3/dist-packages/provisioningserver/utils/service_monitor.py", line 762, in _loadSystemDServiceState
            raise ServiceParsingError(
        provisioningserver.utils.service_monitor.ServiceParsingError: Unable to parse the output from systemd for service 'maas-temporal'.