efivars: extend character set that may be used in boot loader entry ids a bit

See https://github.com/systemd/systemd/pull/10495#discussion_r233992570

diff --git a/src/shared/efivars.c b/src/shared/efivars.c
index 26f905bfaa6c2c39405e95846b7c2e4265458a21..caae7b91386e15b406775127aa230d9ec22aed15 100644 (file)
--- a/src/shared/efivars.c
+++ b/src/shared/efivars.c
@@ -796,7 +796,7 @@ bool efi_loader_entry_name_valid(const char *s) {
         if (strlen(s) > FILENAME_MAX) /* Make sure entry names fit in filenames */
                 return false;
 
-        return in_charset(s, ALPHANUMERICAL "-");
+        return in_charset(s, ALPHANUMERICAL "-_.");
 }
 
 int efi_loader_get_entries(char ***ret) {