From b6e9de2de9725e2f5a3170b8171ad1a1e95e8339 Mon Sep 17 00:00:00 2001 From: David Robillard Date: Tue, 11 Sep 2018 20:54:08 +0200 Subject: Squashed 'waflib/' content from commit 391d285 git-subtree-dir: waflib git-subtree-split: 391d2853c6c97efc90e466f187675e8155c866d6 --- Tools/md5_tstamp.py | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 Tools/md5_tstamp.py (limited to 'Tools/md5_tstamp.py') diff --git a/Tools/md5_tstamp.py b/Tools/md5_tstamp.py new file mode 100644 index 0000000..6428e46 --- /dev/null +++ b/Tools/md5_tstamp.py @@ -0,0 +1,39 @@ +#! /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 + -- cgit v1.2.1