Make copy module idempotent.

Check md5sum before overwriting a file. Unconditionally copying changes the timestamp.
reviewable/pr18780/r1
Jeroen Hoekx 13 years ago
parent 6f55ded1c3
commit 645640b88d

@ -54,11 +54,10 @@ changed = False
if os.path.exists(dest):
md5sum = os.popen("md5sum %s" % dest).read().split()[0]
os.system("cp %s %s" % (src, dest))
md5sum2 = os.popen("md5sum %s" % dest).read().split()[0]
md5sum2 = os.popen("md5sum %s" % src).read().split()[0]
if md5sum != md5sum2:
os.system("cp %s %s" % (src, dest))
changed = True
# mission accomplished

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