888bf204e6
This sketches in generic code for handling YAML configuration. It includes a code-based validation that is used for generating helpful configuration error messages. Related to RM7484. TODO: * Add functional tests for configuration system
122 lines
2.8 KiB
Python
122 lines
2.8 KiB
Python
# Copyright 2014 Rackspace
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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");
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# you may not use this file except in compliance with the
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# License. You may obtain 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,
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# software distributed under the License is distributed on an "AS
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# IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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# express or implied. See the License for the specific language
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# governing permissions and limitations under the License.
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import six
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class TestException(Exception):
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"""
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An exception for the use of tests.
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"""
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pass
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def fake_join(a, *p):
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"""
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Lifted from the POSIX implementation of os.path, for testing
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purposes.
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"""
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path = a
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for b in p:
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if b.startswith('/'):
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path = b
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elif path == '' or path.endswith('/'):
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path += b
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else:
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path += '/' + b
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return path
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def fake_isabs(s):
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"""
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Lifted from the POSIX implementation of os.path, for testing
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purposes.
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"""
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return s.startswith('/')
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def fake_abspath(path):
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"""
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Lifted from the POSIX implementation of os.path, for testing
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purposes.
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"""
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if not fake_isabs(path):
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if six.PY2 and isinstance(path, unicode):
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cwd = os.getcwdu()
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elif six.PY3 and isinstance(path, bytes):
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cwd = os.getcwdb()
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else:
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cwd = os.getcwd()
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path = fake_join(cwd, path)
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return fake_normpath(path)
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def fake_normpath(path):
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"""
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Lifted from the POSIX implementation of os.path, for testing
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purposes.
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"""
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if six.PY2 and isinstance(path, unicode):
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sep = u'/'
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empty = u''
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dot = u'.'
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dotdot = u'..'
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elif six.PY3 and isinstance(path, bytes):
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sep = b'/'
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empty = b''
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dot = b'.'
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dotdot = b'..'
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else:
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sep = '/'
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empty = ''
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dot = '.'
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dotdot = '..'
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if path == empty:
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return dot
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initial_slashes = path.startswith(sep)
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# POSIX allows one or two initial slashes, but treats three or more
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# as single slash.
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if (initial_slashes and
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path.startswith(sep * 2) and not path.startswith(sep * 3)):
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initial_slashes = 2
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comps = path.split(sep)
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new_comps = []
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for comp in comps:
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if comp in (empty, dot):
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continue
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if (comp != dotdot or (not initial_slashes and not new_comps) or
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(new_comps and new_comps[-1] == dotdot)):
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new_comps.append(comp)
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elif new_comps:
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new_comps.pop()
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comps = new_comps
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path = sep.join(comps)
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if initial_slashes:
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path = sep * initial_slashes + path
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return path or dot
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