Merge branch 'jt/batch-fetch-blobs-in-diff'

While running "git diff" in a lazy clone, we can upfront know which
missing blobs we will need, instead of waiting for the on-demand
machinery to discover them one by one.  Aim to achieve better
performance by batching the request for these promised blobs.

* jt/batch-fetch-blobs-in-diff:
  diff: batch fetching of missing blobs
  sha1-file: support OBJECT_INFO_FOR_PREFETCH

1 files changed, 9 insertions, 8 deletions

diff --git a/unpack-trees.c b/unpack-trees.c
index afa4a5cea8..50189909b8 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -406,20 +406,21 @@ static int check_updates(struct unpack_trees_options *o)
 		 * below.
 		 */
 		struct oid_array to_fetch = OID_ARRAY_INIT;
-		int fetch_if_missing_store = fetch_if_missing;
-		fetch_if_missing = 0;
 		for (i = 0; i < index->cache_nr; i++) {
 			struct cache_entry *ce = index->cache[i];
-			if ((ce->ce_flags & CE_UPDATE) &&
-			    !S_ISGITLINK(ce->ce_mode)) {
-				if (!has_object_file(&ce->oid))
-					oid_array_append(&to_fetch, &ce->oid);
-			}
+
+			if (!(ce->ce_flags & CE_UPDATE) ||
+			    S_ISGITLINK(ce->ce_mode))
+				continue;
+			if (!oid_object_info_extended(the_repository, &ce->oid,
+						      NULL,
+						      OBJECT_INFO_FOR_PREFETCH))
+				continue;
+			oid_array_append(&to_fetch, &ce->oid);
 		}
 		if (to_fetch.nr)
 			fetch_objects(repository_format_partial_clone,
 				      to_fetch.oid, to_fetch.nr);
-		fetch_if_missing = fetch_if_missing_store;
 		oid_array_clear(&to_fetch);
 	}
 	for (i = 0; i < index->cache_nr; i++) {