use get_cached_commit_buffer where appropriate

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 7950c4342f81544f719b20add2e1233be36fc718..de36c60ca11d248013c2de42d196f1aff8a2937b 100644 (file)
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1076,7 +1076,7 @@ static int pbase_tree_cache_ix_incr(int ix)
 static struct pbase_tree {
        struct pbase_tree *next;
        /* This is a phony "cache" entry; we are not
-        * going to evict it nor find it through _get()
+        * going to evict it or find it through _get()
         * mechanism -- this is for the toplevel node that
         * would almost always change with any commit.
         */
@@ -2439,12 +2439,23 @@ static void loosen_unused_packed_objects(struct rev_info *revs)
        }
 }
 
+/*
+ * This tracks any options which a reader of the pack might
+ * not understand, and which would therefore prevent blind reuse
+ * of what we have on disk.
+ */
+static int pack_options_allow_reuse(void)
+{
+       return allow_ofs_delta;
+}
+
 static int get_object_list_from_bitmap(struct rev_info *revs)
 {
        if (prepare_bitmap_walk(revs) < 0)
                return -1;
 
-       if (!reuse_partial_packfile_from_bitmap(
+       if (pack_options_allow_reuse() &&
+           !reuse_partial_packfile_from_bitmap(
                        &reuse_packfile,
                        &reuse_packfile_objects,
                        &reuse_packfile_offset)) {