hash: add an SHA-256 implementation using OpenSSL

diff --git a/commit-graph.h b/commit-graph.h
index eea62f8c0ee53b56630a1a2b0c2c716b4cd63670..b05047676514e4d031ac90de50510eb33a4b6db6 100644 (file)
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -6,6 +6,8 @@
 #include "string-list.h"
 #include "cache.h"
 
+#define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"
+
 struct commit;
 
 char *get_commit_graph_filename(const char *obj_dir);
@@ -52,6 +54,12 @@ struct commit_graph {
 
 struct commit_graph *load_commit_graph_one(const char *graph_file);
 
+/*
+ * Return 1 if and only if the repository has a commit-graph
+ * file and generation numbers are computed in that file.
+ */
+int generation_numbers_enabled(struct repository *r);
+
 void write_commit_graph_reachable(const char *obj_dir, int append);
 void write_commit_graph(const char *obj_dir,
                        struct string_list *pack_indexes,