udisks2 monitor not reachable
Due to recent changes in !833 (merged), the udisks2 monitor's definition isn't available in the runtime:
(sound-juicer:2): GLib-GIO-WARNING **: 12:21:00.677: Can't find module 'udisks2' specified in GIO_USE_VOLUME_MONITOR
The definition is supposed to contain the D-Bus name, so it can be contacted from within the sandbox. This is the content of the file on the host:
$ cat /usr/share/gvfs/remote-volume-monitors/udisks2.monitor [RemoteVolumeMonitor] Name=GProxyVolumeMonitorUDisks2 DBusName=org.gtk.vfs.UDisks2VolumeMonitor IsNative=true NativePriority=4
Without this, sound-juicer can't adequately enumerate optical drives.