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Revision signature storing is on repository now.

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        if revno < 1 or revno > self.revno():
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            raise InvalidRevisionNumber(revno)
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    def sign_revision(self, revision_id, gpg_strategy):
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        raise NotImplementedError('sign_revision is abstract')
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    def store_revision_signature(self, gpg_strategy, plaintext, revision_id):
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        raise NotImplementedError('store_revision_signature is abstract')
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    def clone(self, to_location, revision=None, basis_branch=None, to_branch_type=None):
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        """Copy this branch into the existing directory to_location.
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