def merge_tree(self, dst, symlinks=False, *args, **kwargs):
"""
Copy entire contents of self to dst, overwriting existing
contents in dst with those in self.
If the additional keyword `update` is True, each
`src` will only be copied if `dst` does not exist,
or `src` is newer than `dst`.
Note that the technique employed stages the files in a temporary
directory first, so this function is not suitable for merging
trees with large files, especially if the temporary directory
is not capable of storing a copy of the entire source tree.
"""
update = kwargs.pop('update', False)
with tempdir() as _temp_dir:
# first copy the tree to a stage directory to support
# the parameters and behavior of copytree.
stage = _temp_dir / str(hash(self))
self.copytree(stage, symlinks, *args, **kwargs)
# now copy everything from the stage directory using
# the semantics of dir_util.copy_tree
dir_util.copy_tree(stage, dst, preserve_symlinks=symlinks,
update=update)
#
# --- Special stuff from os
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