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cache_root = tempfile.mkdtemp()
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from bzrlib.branch import DivergedBranches
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br_from = find_branch(location)
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old_revno = br_to.revno()
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from branch import find_cached_branch, DivergedBranches
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br_from = find_cached_branch(location, cache_root)
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old_revno = br_to.revno()
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br_to.update_revisions(br_from)