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This commit is contained in:
Thomas Nagy 2015-12-24 18:25:47 +01:00
parent 06c7c09681
commit 6648d3e6e7
1 changed files with 4 additions and 6 deletions
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10
waflib/Utils.py
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@ -187,18 +187,16 @@ def writef(fname, data, m='w', encoding='ISO8859-1'):
def h_file(fname):
"""
Compute a hash value for a file by using md5. This method may be replaced by
a faster version if necessary. The following uses the file size and the timestamp value::
a faster version if necessary. The following uses the file size and the timestamp value.
The performance change can be 0.858s to 0.642s on no-op builds::
import stat
from waflib import Utils
def h_file(fname):
st = os.stat(fname)
if stat.S_ISDIR(st[stat.ST_MODE]): raise IOError('not a file')
m = Utils.md5()
m.update(str(st.st_mtime))
m.update(str(st.st_size))
m.update(fname)
return m.digest()
s = "%s%s%s" % (st.st_mtime, st.st_size, fname)
return Utils.md5(s.encode()).digest()
Utils.h_file = h_file
:type fname: string