[PATCH 6/8] packfile: stop using linked MIDX list in `find_pack_entry()`

[Patrick Steinhardt <ps@pks.im>]

Refactor `find_pack_entry()` so that we stop using the linked list of
multi-pack indices. Note that there is no need to explicitly prepare
alternates, and neither do we have to use `get_multi_pack_index()`,
because `prepare_packed_git()` already takes care of populating all data
structures for us.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 packfile.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/packfile.c b/packfile.c
index e1ced050451..776a72678f5 100644
--- a/packfile.c
+++ b/packfile.c
@@ -2073,16 +2073,15 @@ static int fill_pack_entry(const struct object_id *oid,
 int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e)
 {
 	struct list_head *pos;
-	struct multi_pack_index *m;
 
 	prepare_packed_git(r);
-	if (!r->objects->packed_git && !r->objects->multi_pack_index)
-		return 0;
 
-	for (m = r->objects->multi_pack_index; m; m = m->next) {
-		if (fill_midx_entry(r, oid, e, m))
+	for (struct odb_source *source = r->objects->sources; source; source = source->next)
+		if (source->multi_pack_index && fill_midx_entry(r, oid, e, source->multi_pack_index))
 			return 1;
-	}
+
+	if (!r->objects->packed_git)
+		return 0;
 
 	list_for_each(pos, &r->objects->packed_git_mru) {
 		struct packed_git *p = list_entry(pos, struct packed_git, mru);

-- 
2.50.1.327.g047016eb4a.dirty