sane-backends and dbus problem after upgrade to macOS 10.14.4 (18E226)

[Kyshman (Tony Kinyua)]

After an upgrade to macOS 10.14.4 sane applications like xsane, scanimage are failing with a dbus error.

scanimage -L

dbus[85732]: Dynamic session lookup supported but failed: launchd did not provide a socket path, verify that org.freedesktop.dbus-session.plist is loaded! Assertion failed: (p), function avahi_threaded_poll_lock, file thread-watch.c, line 171. fish: 'scanimage -L' terminated by signal SIGABRT (Abort)

After setting up debug more information is provided.

bash-3.2$ SANE_DEBUG_NET=3 scanimage -L [sanei_debug] Setting debug level of net to 3. [net] sane_init: authorize != null, version_code != null dbus[57747]: Dynamic session lookup supported but failed: launchd did not provide a socket path, verify that org.freedesktop.dbus-session.plist is loaded! [net] net_avahi_init: could not create Avahi client: Memory exhausted [net] net_avahi_init: Avahi init failed, support disabled [net] sane_init: SANE net backend version 1.0.14 (AF-indep+IPv6) from sane-backends 1.0.27 [net] sane_init: Client has little endian byte order [net] sane_init: searching for config file [net] sane_init: done reading config [net] sane_init: evaluating environment variable SANE_NET_HOSTS [net] sane_init: evaluating environment variable SANE_NET_TIMEOUT [net] sane_init: done [net] sane_get_devices: local_only = 0 [net] sane_get_devices: finished (0 devices)

No scanners were identified. If you were expecting something different, check that the scanner is plugged in, turned on and detected by the sane-find-scanner tool (if appropriate). Please read the documentation which came with this software (README, FAQ, manpages). [net] sane_exit: exiting [net] sane_exit: finished.

This setup was working on before the upgrade.