When an object fails to decompress from a pack-file, we mark the object
as 'bad' so we can retry with a different copy of the object (if such a
copy exists).

Before now, the multi-pack-index did not update the bad objects list for
the pack-files it contains, and we did not check the bad objects list
when reading an object. Now, do both.

Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
 midx.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/midx.c b/midx.c
index 6824acf5f8..7fa75a37a3 100644
--- a/midx.c
+++ b/midx.c
@@ -280,6 +280,16 @@ static int nth_midxed_pack_entry(struct multi_pack_index 
*m, struct pack_entry *
        if (!is_pack_valid(p))
                return 0;
 
+       if (p->num_bad_objects) {
+               uint32_t i;
+               struct object_id oid;
+               nth_midxed_object_oid(&oid, m, pos);
+               for (i = 0; i < p->num_bad_objects; i++)
+                       if (!hashcmp(oid.hash,
+                                    p->bad_object_sha1 + the_hash_algo->rawsz 
* i))
+                               return 0;
+       }
+
        e->offset = nth_midxed_offset(m, pos);
        e->p = p;
 
-- 
2.18.0.118.gd4f65b8d14

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