Juju Charm - Cinder backup
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# Copyright 2016 Canonical Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
from collections import OrderedDict
from charmhelpers.core.hookenv import (
relation_ids,
service_name,
)
from charmhelpers.contrib.openstack import (
templating,
context,
)
from charmhelpers.contrib.openstack.utils import (
get_os_codename_package,
)
from charmhelpers.contrib.openstack.alternatives import install_alternative
from charmhelpers.core.host import mkdir
PACKAGES = [
'ceph-common',
'cinder-backup',
]
CHARM_CEPH_CONF = '/var/lib/charm/{}/ceph.conf'
CEPH_CONF = '/etc/ceph/ceph.conf'
TEMPLATES = 'templates/'
# Map config files to hook contexts and services that will be associated
# with file in restart_on_changes()'s service map.
CONFIG_FILES = {}
def ceph_config_file():
return CHARM_CEPH_CONF.format(service_name())
def register_configs():
"""Register config files with their respective contexts.
Registration of some configs may not be required depending on
existing of certain relations.
"""
# if called without anything installed (eg during install hook)
# just default to earliest supported release. configs dont get touched
# till post-install, anyway.
release = get_os_codename_package('cinder-common', fatal=False) or 'folsom'
configs = templating.OSConfigRenderer(templates_dir=TEMPLATES,
openstack_release=release)
confs = []
if relation_ids('ceph'):
# Add charm ceph configuration to resources and
# ensure directory actually exists
mkdir(os.path.dirname(ceph_config_file()))
mkdir(os.path.dirname(CEPH_CONF))
# Install ceph config as an alternative for co-location with
# ceph and ceph-osd charms - nova-compute ceph.conf will be
# lower priority that both of these but thats OK
if not os.path.exists(ceph_config_file()):
# touch file for pre-templated generation
open(ceph_config_file(), 'w').close()
install_alternative(os.path.basename(CEPH_CONF),
CEPH_CONF, ceph_config_file())
CONFIG_FILES[ceph_config_file()] = {
'hook_contexts': [context.CephContext()],
'services': ['cinder-backup'],
}
confs.append(ceph_config_file())
for conf in confs:
configs.register(conf, CONFIG_FILES[conf]['hook_contexts'])
return configs
def restart_map():
"""Determine the correct resource map to be passed to
charmhelpers.core.restart_on_change() based on the services configured.
:returns: dict: A dictionary mapping config file to lists of services
that should be restarted when file changes.
"""
_map = []
for f, ctxt in CONFIG_FILES.iteritems():
svcs = []
for svc in ctxt['services']:
svcs.append(svc)
if svcs:
_map.append((f, svcs))
return OrderedDict(_map)
def set_ceph_env_variables(service):
# XXX: Horrid kludge to make cinder-backup use
# a different ceph username than admin
env = open('/etc/environment', 'r').read()
if 'CEPH_ARGS' not in env:
with open('/etc/environment', 'a') as out:
out.write('CEPH_ARGS="--id %s"\n' % service)
with open('/etc/init/cinder-backup.override', 'w') as out:
out.write('env CEPH_ARGS="--id %s"\n' % service)