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(mbp) warning on cross-format stream transfers

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bzrlib/repository.py
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        #
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        # nb this is only active for local-local fetches; other things using
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        # streaming.
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        trace.warning("Fetching between repositories with different formats\n"
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            "from %s to %s.\n"
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            "This may take some time. Upgrade the branches to the same format \n"
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            "for better results.\n"
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            % (self.source._format, self.target._format))
 
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        ui.ui_factory.warn_cross_format_fetch(self.source._format,
 
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            self.target._format)
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        if (not self.source.supports_rich_root()
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            and self.target.supports_rich_root()):
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            self._converting_to_rich_root = True
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                    self._extract_and_insert_inventories(
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                        substream, src_serializer)
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            elif substream_type == 'inventory-deltas':
 
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                ui.ui_factory.warn_cross_format_fetch(src_format,
 
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                    self.target_repo._format)
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                self._extract_and_insert_inventory_deltas(
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                    substream, src_serializer)
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            elif substream_type == 'chk_bytes':
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    def _get_convertable_inventory_stream(self, revision_ids,
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                                          delta_versus_null=False):
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        # The source is using CHKs, but the target either doesn't or it has a
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        # different serializer.  The StreamSink code expects to be able to
 
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        # The two formats are sufficiently different that there is no fast
 
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        # path, so we need to send just inventorydeltas, which any
 
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        # sufficiently modern client can insert into any repository.
 
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        # The StreamSink code expects to be able to
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        # convert on the target, so we need to put bytes-on-the-wire that can
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        # be converted.  That means inventory deltas (if the remote is <1.19,
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        # RemoteStreamSink will fallback to VFS to insert the deltas).