helper: Improve error message when run on random files (thanks Alexey Torkhov).

diff --git a/helper/appliance.c b/helper/appliance.c
index b2cc840..c4d0b32 100644 (file)
--- a/helper/appliance.c
+++ b/helper/appliance.c
@@ -284,7 +284,9 @@ add_hostfiles (const char *hostfiles_file, struct writer *writer)
     if (strchr (hostfile, '*') || strchr (hostfile, '?')) {
       char *dirname = xstrdup (hostfile);
       char *patt = strrchr (dirname, '/');
-      assert (patt);
+      if (!patt)
+        error (EXIT_FAILURE, 0, "%s: line %zu: invalid pattern\n(is this file a supermin appliance hostfiles file?)",
+               hostfiles_file, i+1);
       *patt++ = '\0';
 
       char **files = read_dir (dirname);