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functions for copying and archiving files and directory trees.
XXX The functions here don't copy the resource fork or other metadata
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copy a directory tree using copy2().
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it is false, the contents of the files pointed to by symbolic
links are copied.
The optional ignore argument is a callable. If given, it
is called with the `src` parameter, which is the directory
being visited by copytree(), and `names` which is the list of
`src` contents, as returned by os.listdir():
callable(src, names) -> ignored_names
Since copytree() is called recursively, the callable will be
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path is the argument to that function that caused it to fail; and
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If the destination already exists but is not a directory, it may be
overwritten depending on os.rename() semantics.
If the destination is on our current filesystem, then rename() is used.
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or "gztar".
'root_dir' is a directory that will be the root directory of
the
archive; ie. we typically chdir into 'root_dir' before
creating the
archive. 'base_dir' is the directory where we start
archiving from;
ie. 'base_dir' will be the common prefix of all files and
directories in the archive. 'root_dir' and
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