~bzr-pqm/bzr/bzr.dev

Better comment about fetching to or from stacked repositories

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"""See InterRepository.fetch()."""

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if (len(self.source._fallback_repositories) > 0 or

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len(self.target._fallback_repositories) > 0):

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# the pack fetcher assumes it can just copy pack binary data, but

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# that may not be safe if there are fallback repositories on

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# either side; instead we look at the revisions and deltas one by

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# one.

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# The pack layer is not aware of fallback repositories, so when

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# fetching from a stacked repository or into a stacked repository

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# we use the generic fetch logic which uses the VersionedFiles

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# attributes on repository.

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from bzrlib.fetch import RepoFetcher

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fetcher = RepoFetcher(self.target, self.source, revision_id,

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pb, find_ghosts)