86 lines
3.0 KiB
Python
86 lines
3.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2012 OpenStack Foundation.
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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 ConfigParser
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import os
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import string
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# this import has the effect of defining global var "filters",
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# referenced by build_filter(), below. It gets set up by
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# quantum-rootwrap, when we load_filters().
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from quantum.rootwrap import filters
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def build_filter(class_name, *args):
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"""Returns a filter object of class class_name"""
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if not hasattr(filters, class_name):
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# TODO(jrd): Log the error (whenever quantum-rootwrap has a log file)
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return None
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filterclass = getattr(filters, class_name)
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return filterclass(*args)
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def load_filters(filters_path):
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"""Load filters from a list of directories"""
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filterlist = []
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for filterdir in filters_path:
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if not os.path.isdir(filterdir):
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continue
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for filterfile in os.listdir(filterdir):
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filterconfig = ConfigParser.RawConfigParser()
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filterconfig.read(os.path.join(filterdir, filterfile))
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for (name, value) in filterconfig.items("Filters"):
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filterdefinition = [string.strip(s) for s in value.split(',')]
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newfilter = build_filter(*filterdefinition)
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if newfilter is None:
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continue
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filterlist.append(newfilter)
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return filterlist
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def match_filter(filter_list, 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 filter_list:
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if f.match(userargs):
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if isinstance(f, filters.ExecCommandFilter):
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# This command calls exec verify that remaining args
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# matches another filter.
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leaf_filters = [fltr for fltr in filter_list
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if not isinstance(fltr,
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filters.ExecCommandFilter)]
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args = f.exec_args(userargs)
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if not args or not match_filter(leaf_filters, args):
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continue
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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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