Merge pull request #26887 from yuwata/proc-cmdline-filter-arguments

proc-cmdline: filter PID1 arguments on container

src/nspawn/nspawn.c

@@ -815,6 +815,9 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
+        /* Resetting to 0 forces the invocation of an internal initialization routine of getopt_long()
+         * that checks for GNU extensions in optstring ('-' or '+' at the beginning). */
+        optind = 0;
         while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:nUE:P", options, NULL)) >= 0)
                 switch (c) {