Re: [Libguestfs] [libnbd PATCH v3 19/19] socket activation: set LISTEN_FDNAMES

(2) If we pass LISTEN_PID=xxx and LISTEN_FDS=1, and just "pass through" an *inherited* LISTEN_FDNAMES variable, then it will (in the general case) confuse the nbd server that we start. Namely, if LISTEN_FDNAMES has multiple colon-separated elements (more than 1), or is the empty string (= 0 elements), then sd_listen_fds_with_names() in the nbd server will fail the "n_names != n_fds" check, and return (-EINVAL). If LISTEN_FDNAMES happens to have one element, then sd_listen_fds_with_names() will succeed, but the returned name will confuse the nbd server.