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wt = self.make_branch_and_tree('source')
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wt.commit('A', allow_pointless=True, rev_id='A')
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repo = wt.branch.repository
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repo.sign_revision('A', bzrlib.gpg.LoopbackGPGStrategy(None))
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old_signature = repo.get_signature_text('A')
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old_format = bzrdir.BzrDirFormat.get_default_format()