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1e06a72a0a
Enable callers to generate reachability bitmaps when performing MIDX layer compaction by combining all existing bitmaps from the compacted layers. Note that the because of the object/pack ordering described by the previous commit, the pseudo-pack order for the compacted MIDX is the same as concatenating the individual pseudo-pack orderings for each layer in the compaction range. As a result, the only non-test or documentation change necessary is to treat all objects as non-preferred during compaction so as not to disturb the object ordering. In the future, we may want to adjust which commit(s) receive reachability bitmaps when compacting multiple .bitmap files into one, or even generate new bitmaps (e.g., if the references have moved significantly since the .bitmap was generated). This commit only implements combining all existing bitmaps in range together in order to demonstrate and lay the groundwork for more exotic strategies. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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