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bzrlib/fetch.py
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    """
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    def __init__(self, to_repository, from_repository, last_revision=None, pb=None):
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        if to_repository.bzrdir.transport.base == from_repository.bzrdir.transport.base:
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            raise Exception("can't fetch from a repository to itself %s, %s" % 
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                            (from_repository.bzrdir.transport.base,
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                             to_repository.bzrdir.transport.base))
 
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            # check that last_revision is in 'from' and then return a no-operation.
 
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            if last_revision not in (None, NULL_REVISION):
 
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                from_repository.get_revision(last_revision)
 
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            return
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        self.to_repository = to_repository
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        self.from_repository = from_repository
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        # must not mutate self._last_revision as its potentially a shared instance