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cdrom_id
For polling devices and getting information sent into udev, the package builds a program called cdrom_id. It's located at /lib/udev/cdrom_id. Running it will give information that is passed to udev triggers.
/lib/udev/cdrom_id /dev/sr0
ID_CDROM=1 ID_CDROM_CD=1 ID_CDROM_DVD=1 ID_CDROM_BD=1 ID_CDROM_MRW=1 ID_CDROM_MRW_W=1 ID_CDROM_MEDIA=1 ID_CDROM_MEDIA_DVD=1 ID_CDROM_MEDIA_STATE=complete ID_CDROM_MEDIA_SESSION_COUNT=1 ID_CDROM_MEDIA_TRACK_COUNT=1 ID_CDROM_MEDIA_TRACK_COUNT_DATA=1
