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packfile: refactor get_multi_pack_index() to work on sources

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The function `get_multi_pack_index()` loads multi-pack indices via
`prepare_packed_git()` and then returns the linked list of multi-pack
indices that is stored in `struct object_database`. That list is in the
process of being removed though in favor of storing the MIDX as part of
the object database source it belongs to.

Refactor `get_multi_pack_index()` so that it returns the multi-pack
index for a single object source. Callers are now expected to call this
function for each source they are interested in. This requires them to
iterate through alternates, so we have to prepare alternate object
sources before doing so.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2025-07-15 13:29:21 +02:00
committed by Junio C Hamano
parent 6567432ab4
commit 736bb725eb
7 changed files with 57 additions and 62 deletions
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10
builtin/pack-objects.c
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@@ -1706,8 +1706,8 @@ static int want_object_in_pack_mtime(const struct object_id *oid,
uint32_t found_mtime)
{
int want;
struct odb_source *source;
struct list_head *pos;
struct multi_pack_index *m;
if (!exclude && local && has_loose_object_nonlocal(oid))
return 0;
@@ -1727,9 +1727,13 @@ static int want_object_in_pack_mtime(const struct object_id *oid,
*found_offset = 0;
}
for (m = get_multi_pack_index(the_repository); m; m = m->next) {
odb_prepare_alternates(the_repository->objects);
for (source = the_repository->objects->sources; source; source = source->next) {
struct multi_pack_index *m = get_multi_pack_index(source);
struct pack_entry e;
if (fill_midx_entry(the_repository, oid, &e, m)) {
if (m && fill_midx_entry(the_repository, oid, &e, m)) {
want = want_object_in_pack_one(e.p, oid, exclude, found_pack, found_offset, found_mtime);
if (want != -1)
return want;