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pack-bitmap: return multiple packs via reuse_partial_packfile_from_bitmap()

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Further prepare for enabling verbatim pack-reuse over multiple packfiles
by changing the signature of reuse_partial_packfile_from_bitmap() to
populate an array of `struct bitmapped_pack *`'s instead of a pointer to
a single packfile.

Since the array we're filling out is sized dynamically[^1], add an
additional `size_t *` parameter which will hold the number of reusable
packs (equal to the number of elements in the array).

Note that since we still have not implemented true multi-pack reuse,
these changes aren't propagated out to the rest of the caller in
builtin/pack-objects.c.

In the interim state, we expect that the array has a single element, and
we use that element to fill out the static `reuse_packfile` variable
(which is a bog-standard `struct packed_git *`). Future commits will
continue to push this change further out through the pack-objects code.

[^1]: That is, even though we know the number of packs which are
  candidates for pack-reuse, we do not know how many of those
  candidates we can actually reuse.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2023-12-14 17:24:04 -05:00
committed by Junio C Hamano
parent 35e156b9de
commit 83296d20e8
3 changed files with 14 additions and 6 deletions
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9
builtin/pack-objects.c
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@@ -3940,14 +3940,19 @@ static int pack_options_allow_reuse(void)
static int get_object_list_from_bitmap(struct rev_info *revs)
{
struct bitmapped_pack *packs = NULL;
size_t packs_nr = 0;
if (!(bitmap_git = prepare_bitmap_walk(revs, 0)))
return -1;
if (pack_options_allow_reuse())
reuse_partial_packfile_from_bitmap(bitmap_git, &reuse_packfile,
reuse_partial_packfile_from_bitmap(bitmap_git, &packs,
&packs_nr,
&reuse_packfile_bitmap);
if (reuse_packfile) {
if (packs) {
reuse_packfile = packs[0].p;
reuse_packfile_objects = bitmap_popcount(reuse_packfile_bitmap);
if (!reuse_packfile_objects)
BUG("expected non-empty reuse bitmap");