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author | David Robillard <d@drobilla.net> | 2018-09-15 14:51:02 +0200 |
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committer | David Robillard <d@drobilla.net> | 2018-09-15 14:51:02 +0200 |
commit | ffb5286641dca2e12bebd2c4a4f4a73cc11a20e6 (patch) | |
tree | 4d5eee9bf36eb3a34080a7b928333939327a5a96 /waflib/Tools/md5_tstamp.py | |
parent | bd57bc1edb6d8131a920bcc4f12d91457e2ca2ed (diff) | |
parent | 8c96b17a5393bffee0c521c4872a9fa999048032 (diff) | |
download | lilv-ffb5286641dca2e12bebd2c4a4f4a73cc11a20e6.tar.gz lilv-ffb5286641dca2e12bebd2c4a4f4a73cc11a20e6.tar.bz2 lilv-ffb5286641dca2e12bebd2c4a4f4a73cc11a20e6.zip |
Merge commit '8c96b17a5393bffee0c521c4872a9fa999048032' as 'waflib'
Diffstat (limited to 'waflib/Tools/md5_tstamp.py')
-rw-r--r-- | waflib/Tools/md5_tstamp.py | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/waflib/Tools/md5_tstamp.py b/waflib/Tools/md5_tstamp.py new file mode 100644 index 0000000..6428e46 --- /dev/null +++ b/waflib/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 + |