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