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# We need to accumulate additional repositories here, to pass them in
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# We will call fallback.unlock() when we transition to the unlocked
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# state, so always add a lock here. If a caller passes us a locked
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# repository, they are responsible for unlocking it later.
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self._fallback_repositories.append(repository)
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# If self._real_repository was parameterised already (e.g. because a
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# _real_branch had its get_stacked_on_url method called), then the