[issue17180] shutil copy* unsafe on POSIX - they preserve setuid/setgit bits

[Christian Heimes]

Christian Heimes added the comment:

Here is a new patch with a new keyword argument preserve_sbits. Perhaps we use `True` as default for Python 2.6 to 3.3 and switch to False in Python 3.4?

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Added file: http://bugs.python.org/file29058/17180_preserve_sbits.patch

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