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stop_revisions = [(None, revid) for revid in self.source.all_revision_ids()]
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if not self.mapping.roundtripping:
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for (git_sha, bzr_revid) in stop_revisions:
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raise NoPushSupport(self.source, self.target, self.mapping, bzr_revid)
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self.fetch_objects(stop_revisions, lossy=False)