[issue15100] Race conditions in shutil.copy, shutil.copy2 and shutil.copyfile

Changes by Radoslaw A. Zarzynski : Added file: http://bugs.python.org/file26043/python_shutil_copy_with_umask.diff ___ Python tracker <http://bugs.python.org/issue15

[issue15100] Race conditions in shutil.copy, shutil.copy2 and shutil.copyfile

New submission from Radoslaw A. Zarzynski : shutil.copy and shutil.copy2 first copy a file content and afterwards change permissions of a destination file. Unfortunately, the sequence isn't atomical and may lead to disclosure of matter of any file that is being dupli