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def do_tip_change_with_locked_branch(self, branch, new_last_revision_id):
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if new_last_revision_id == 'null:':
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if not branch.repository.has_revision(new_last_revision_id):
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return FailedSmartServerResponse(
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('NoSuchRevision', new_last_revision_id))
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return SuccessfulSmartServerResponse(('ok',))