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41 lines
953 B
Python
41 lines
953 B
Python
#! /usr/bin/env python
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# encoding: utf-8
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"""
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Re-calculate md5 hashes of files only when the file times or the file
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size have changed.
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The hashes can also reflect either the file contents (STRONGEST=True) or the
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file time and file size.
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The performance benefits of this module are usually insignificant.
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"""
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import os, stat
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from waflib import Utils, Build, Node
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STRONGEST = True
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Build.SAVED_ATTRS.append('hashes_md5_tstamp')
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def h_file(self):
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filename = self.abspath()
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st = os.stat(filename)
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cache = self.ctx.hashes_md5_tstamp
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if filename in cache and cache[filename][0] == st.st_mtime:
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return cache[filename][1]
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global STRONGEST
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if STRONGEST:
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ret = Utils.h_file(filename)
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else:
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if stat.S_ISDIR(st[stat.ST_MODE]):
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raise IOError('Not a file')
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ret = Utils.md5(str((st.st_mtime, st.st_size)).encode()).digest()
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cache[filename] = (st.st_mtime, ret)
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return ret
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h_file.__doc__ = Node.Node.h_file.__doc__
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Node.Node.h_file = h_file
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