pack-objects: handle island check for "external" delta base

diff --git a/commit-graph.c b/commit-graph.c
index 8a1bec7b8aa420dd3d4ecadc95dee31029533c07..0cad55eec2d5603ccd375e093206f0c971c3524a 100644 (file)
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -233,6 +233,24 @@ static int prepare_commit_graph(struct repository *r)
        return !!r->objects->commit_graph;
 }
 
+int generation_numbers_enabled(struct repository *r)
+{
+       uint32_t first_generation;
+       struct commit_graph *g;
+       if (!prepare_commit_graph(r))
+              return 0;
+
+       g = r->objects->commit_graph;
+
+       if (!g->num_commits)
+               return 0;
+
+       first_generation = get_be32(g->chunk_commit_data +
+                                   g->hash_len + 8) >> 2;
+
+       return !!first_generation;
+}
+
 static void close_commit_graph(void)
 {
        free_commit_graph(the_repository->objects->commit_graph);