70 lines
2.4 KiB
Python
70 lines
2.4 KiB
Python
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"""SCons.Sig
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The Signature package for the scons software construction utility.
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004 The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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__revision__ = "/home/scons/scons/branch.0/baseline/src/engine/SCons/Sig/__init__.py 0.96.1.D001 2004/08/23 09:55:29 knight"
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try:
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import MD5
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default_module = MD5
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except ImportError:
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import TimeStamp
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default_module = TimeStamp
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# XXX We should move max_drift into Node/FS.py,
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# since it's really something about files.
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default_max_drift = 2*24*60*60
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class SConsignEntry:
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"""The old SConsignEntry format.
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We keep this around to handle conversions from old .sconsign files."""
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timestamp = None
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bsig = None
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csig = None
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implicit = None
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class Calculator:
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"""
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Encapsulates signature calculations and .sconsign file generating
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for the build engine.
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"""
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def __init__(self, module=default_module, max_drift=default_max_drift):
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"""
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Initialize the calculator.
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module - the signature module to use for signature calculations
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max_drift - the maximum system clock drift used to determine when to
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cache content signatures. A negative value means to never cache
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content signatures. (defaults to 2 days)
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"""
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self.module = module
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self.max_drift = max_drift
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default_calc = Calculator()
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