mirror of https://gitlab.com/ita1024/waf.git
57 lines
1.6 KiB
Python
57 lines
1.6 KiB
Python
#! /usr/bin/env python
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# encoding: utf-8
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"""
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Store some values on the buildcontext mapping file paths to
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stat values and md5 values (timestamp + md5)
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this way the md5 hashes are computed only when timestamp change (can be faster)
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There is usually little or no gain from enabling this, but it can be used to enable
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the second level cache with timestamps (WAFCACHE)
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You may have to run distclean or to remove the build directory before enabling/disabling
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this hashing scheme
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"""
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import os, stat
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try: import cPickle
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except: import pickle as cPickle
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from waflib import Utils, Build, Context
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Context.DBFILE += '_md5tstamp'
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Build.hash_cache = {}
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Build.SAVED_ATTRS.append('hash_cache')
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def store(self):
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# save the hash cache as part of the default pickle file
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self.hash_cache = Build.hash_cache
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self.store_real()
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Build.BuildContext.store_real = Build.BuildContext.store
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Build.BuildContext.store = store
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def restore(self):
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# we need a module variable for h_file below
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self.restore_real()
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try:
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Build.hash_cache = self.hash_cache or {}
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except Exception as e:
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Build.hash_cache = {}
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Build.BuildContext.restore_real = Build.BuildContext.restore
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Build.BuildContext.restore = restore
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def h_file(filename):
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st = os.stat(filename)
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if stat.S_ISDIR(st[stat.ST_MODE]): raise IOError('not a file')
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if filename in Build.hash_cache:
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if Build.hash_cache[filename][0] == str(st.st_mtime):
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return Build.hash_cache[filename][1]
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m = Utils.md5()
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m.update(str(st.st_mtime))
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m.update(str(st.st_size))
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m.update(filename)
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# ensure that the cache is overwritten
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Build.hash_cache[filename] = (str(st.st_mtime), m.digest())
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return m.digest()
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Utils.h_file = h_file
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