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authorLibravatar Taylor Blau <me@ttaylorr.com>2021-08-31 16:52:02 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2021-09-01 10:58:43 -0700
commit5d3cd09a80819009636ae85c5171d9a4057eb372 (patch)
tree5853e24e72884249a2e6e463c5b8f208727318bf /diff-delta.c
parentmidx: clear auxiliary .rev after replacing the MIDX (diff)
downloadtgif-5d3cd09a80819009636ae85c5171d9a4057eb372.tar.xz
midx: reject empty `--preferred-pack`'s
The soon-to-be-implemented multi-pack bitmap treats object in the first bit position specially by assuming that all objects in the pack it was selected from are also represented from that pack in the MIDX. In other words, the pack from which the first object was selected must also have all of its other objects selected from that same pack in the MIDX in case of any duplicates. But this assumption relies on the fact that there is at least one object in that pack to begin with; otherwise the object in the first bit position isn't from a preferred pack, in which case we can no longer assume that all objects in that pack were also selected from the same pack. Guard this assumption by checking the number of objects in the given preferred pack, and failing if the given pack is empty. To make sure we can safely perform this check, open any packs which are contained in an existing MIDX via prepare_midx_pack(). The same is done for new packs via the add_pack_to_midx() callback, but packs picked up from a previous MIDX will not yet have these opened. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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