extern int get_oid(const char *str, struct object_id *oid);
-typedef int each_abbrev_fn(const unsigned char *sha1, void *);
+typedef int each_abbrev_fn(const struct object_id *oid, void *);
extern int for_each_abbrev(const char *prefix, each_abbrev_fn, void *);
extern int set_disambiguate_hint_config(const char *var, const char *value);