commit-graph: return with errors during write

diff --git a/commit-graph.h b/commit-graph.h
index ada7aea9edb4f53a5bed255a717c4d14b1edfa23..869717ca19f19294e28ca01096a1ba0e51e2e0a1 100644 (file)
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -7,6 +7,7 @@
 #include "cache.h"
 
 #define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"
+#define GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD "GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD"
 
 struct commit;
 
@@ -64,12 +65,18 @@ struct commit_graph *parse_commit_graph(void *graph_map, int fd,
  */
 int generation_numbers_enabled(struct repository *r);
 
-void write_commit_graph_reachable(const char *obj_dir, int append,
+/*
+ * The write_commit_graph* methods return zero on success
+ * and a negative value on failure. Note that if the repository
+ * is not compatible with the commit-graph feature, then the
+ * methods will return 0 without writing a commit-graph.
+ */
+int write_commit_graph_reachable(const char *obj_dir, int append,
                                  int report_progress);
-void write_commit_graph(const char *obj_dir,
-                       struct string_list *pack_indexes,
-                       struct string_list *commit_hex,
-                       int append, int report_progress);
+int write_commit_graph(const char *obj_dir,
+                      struct string_list *pack_indexes,
+                      struct string_list *commit_hex,
+                      int append, int report_progress);
 
 int verify_commit_graph(struct repository *r, struct commit_graph *g);