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class DiskTreeTransform(TreeTransformBase):
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"""Tree transform storing its contents on disk."""
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def __init__(self, tree, limbodir, pb=DummyProgress(),
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def __init__(self, tree, limbodir, pb=None,
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:param tree: The tree that will be transformed, but not necessarily
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:param limbodir: A directory where new files can be stored until
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they are installed in their proper places
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:param case_sensitive: If True, the target of the transform is
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case sensitive, not just case preserving.