mxgrub: Exit codes after grub-install failure

[pmenzel]

If grub-install returns common exit codes, then should in cmd_install, the and exit 1 be changed to or exit 1?

    if ($mbr_type ne 'GRUB') {
            sys 'grub-install',$root_disk and exit 1;
    }

[donald]

It should be changed to

sys 'grub-install',$root_disk;

because the subroutine sys already does an exit 1if the external command fails, it doesn't return. Inside sys the system @cmd and exit 1; is correct, because the builtin function system returns the exit status of the external command.