/usr/share/pyshared/maasserver/support/pertenant/utils.py is in python-django-maas 1.2+bzr1373+dfsg-0ubuntu1~12.04.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# GNU Affero General Public License version 3 (see the file LICENSE).
"""Utilities for the per-tenant file storage work."""
from __future__ import (
absolute_import,
print_function,
unicode_literals,
)
__metaclass__ = type
__all__ = [
"get_bootstrap_node_owner",
]
from maasserver.models import (
FileStorage,
Node,
)
import yaml
PROVIDER_STATE_FILENAME = 'provider-state'
def get_bootstrap_node_owner():
"""Return the owner of the bootstrap node or None if it cannot be found.
This method uses the unowned 'provider-state' file to extract the system_id
of the bootstrap node.
"""
try:
provider_file = FileStorage.objects.get(
filename=PROVIDER_STATE_FILENAME, owner=None)
except FileStorage.DoesNotExist:
return None
system_id = extract_bootstrap_node_system_id(provider_file.content)
if system_id is None:
return None
try:
return Node.objects.get(system_id=system_id).owner
except Node.DoesNotExist:
return None
def extract_bootstrap_node_system_id(content):
"""Extract the system_id of the node referenced in the given
provider-state file.
This method implements a very defensive strategy; if the given
content is not in yaml format or if the owner of the bootstrap
node cannot be found, it returns None.
"""
try:
state = yaml.load(content)
except yaml.YAMLError:
return None
try:
parts = state['zookeeper-instances'][0].split('/')
except (IndexError, TypeError):
return None
system_id = [part for part in parts if part != ''][-1]
return system_id
|