64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2012 Openstack, LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import sys
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FILTERS_MODULES = ['quantum.rootwrap.linuxbridge-agent',
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'quantum.rootwrap.openvswitch-agent',
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'quantum.rootwrap.ryu-agent',
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]
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def load_filters():
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"""Load filters from modules present in quantum.rootwrap."""
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filters = []
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for modulename in FILTERS_MODULES:
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try:
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__import__(modulename)
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module = sys.modules[modulename]
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filters = filters + module.filterlist
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except ImportError:
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# It's OK to have missing filters, since filter modules
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# may be shipped with specific nodes
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pass
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return filters
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def match_filter(filters, userargs):
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"""
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Checks user command and arguments through command filters and
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returns the first matching filter, or None is none matched.
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"""
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found_filter = None
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for f in filters:
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if f.match(userargs):
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# Try other filters if executable is absent
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if not os.access(f.exec_path, os.X_OK):
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if not found_filter:
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found_filter = f
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continue
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# Otherwise return matching filter for execution
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return f
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# No filter matched or first missing executable
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return found_filter
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