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def __init__(self, to_repository, from_repository, last_revision=None,
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"""Create a repo fetcher.
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:param last_revision: If set, try to limit to the data this revision
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:param find_ghosts: If True search the entire history for ghosts.
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# repository.fetch has the responsibility for short-circuiting
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# attempts to copy between a repository and itself.
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self.to_repository = to_repository