Crawling through the code it seems that the int r, which is returned by systemd-nspawn is only set once after being initialized with EXIT_FAILURE.


line 586: if ((r = parse_argv(argc, argv)) <= 0)

After that a lot of stuff happens, but nothing re-assigns r
The next block that may re-assign r starts in line 777:

        r = wait_for_terminate_and_warn(argc > optind ? argv[optind] : "bash", pid);

        if (r < 0)
                r = EXIT_FAILURE;

But this never happens because in line 769 this happens:

        if (process_pty(master, &mask) < 0)
                goto finish;

Thanks, fixed in git.