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Merge in real stacked repository work.

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bzrlib/remote.py
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        # Can this repository be given external locations to lookup additional
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        # data.
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        self.supports_external_lookups = False
 
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        # Additional places to query for data.
 
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        self._fallback_repositories = []
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    def __str__(self):
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        return "%s(%s)" % (self.__class__.__name__, self.base)
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                committer=committer, revprops=revprops, revision_id=revision_id)
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        return builder
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    def add_fallback_repository(self, repository):
 
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        """Add a repository to use for looking up data not held locally.
 
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        :param repository: A repository.
 
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        """
 
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        if not self._format.supports_external_lookups:
 
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            raise errors.UnstackableRepositoryFormat(self._format, self.base)
 
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        # We need to accumulate additional repositories here, to pass them in
 
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        # on various RPC's.
 
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        self._fallback_repositories.append(repository)
 
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    def add_inventory(self, revid, inv, parents):
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        self._ensure_real()
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        return self._real_repository.add_inventory(revid, inv, parents)