/usr/share/pyshared/nova/rootwrap/wrapper.py is in python-nova 2012.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2011 OpenStack, LLC.
# All Rights Reserved.
#
# 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
import sys
FILTERS_MODULES = ['nova.rootwrap.compute',
'nova.rootwrap.network',
'nova.rootwrap.volume',
]
def load_filters():
"""Load filters from modules present in nova.rootwrap."""
filters = []
for modulename in FILTERS_MODULES:
try:
__import__(modulename)
module = sys.modules[modulename]
filters = filters + module.filterlist
except ImportError:
# It's OK to have missing filters, since filter modules are
# shipped with specific nodes rather than with python-nova
pass
return filters
def match_filter(filters, userargs):
"""
Checks user command and arguments through command filters and
returns the first matching filter, or None is none matched.
"""
found_filter = None
for f in filters:
if f.match(userargs):
# Try other filters if executable is absent
if not os.access(f.exec_path, os.X_OK):
if not found_filter:
found_filter = f
continue
# Otherwise return matching filter for execution
return f
# No filter matched or first missing executable
return found_filter
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