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38ff7cabb6
Implement the writing half of multi-pack reverse indexes. This is nothing more than the format describe a few patches ago, with a new set of helper functions that will be used to clear out stale .rev files corresponding to old MIDXs. Unfortunately, a very similar comparison function as the one implemented recently in pack-revindex.c is reimplemented here, this time accepting a MIDX-internal type. An effort to DRY these up would create more indirection and overhead than is necessary, so it isn't pursued here. Currently, there are no callers which pass the MIDX_WRITE_REV_INDEX flag, meaning that this is all dead code. But, that won't be the case for long, since subsequent patches will introduce the multi-pack bitmap, which will begin passing this field. (In midx.c:write_midx_internal(), the two adjacent if statements share a conditional, but are written separately since the first one will eventually also handle the MIDX_WRITE_BITMAP flag, which does not yet exist.) Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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