static const char *whence_s(void)
 {
-       char *s = "";
+       const char *s = "";
 
        switch (whence) {
        case FROM_COMMIT:
                break;
        case FROM_MERGE:
-               s = "merge";
+               s = _("merge");
                break;
        case FROM_CHERRY_PICK:
-               s = "cherry-pick";
+               s = _("cherry-pick");
                break;
        }
 
                fd = hold_locked_index(&index_lock, 1);
                add_files_to_cache(also ? prefix : NULL, pathspec, 0);
                refresh_cache_or_die(refresh_flags);
-               update_main_cache_tree(1);
+               update_main_cache_tree(WRITE_TREE_SILENT);
                if (write_cache(fd, active_cache, active_nr) ||
                    close_lock_file(&index_lock))
                        die(_("unable to write new_index file"));
                fd = hold_locked_index(&index_lock, 1);
                refresh_cache_or_die(refresh_flags);
                if (active_cache_changed) {
-                       update_main_cache_tree(1);
+                       update_main_cache_tree(WRITE_TREE_SILENT);
                        if (write_cache(fd, active_cache, active_nr) ||
                            commit_locked_index(&index_lock))
                                die(_("unable to write new_index file"));