Systemd/rules.d/60-cdrom_id.rules

# do not edit this file, it will be overwritten on update

ACTION=="remove", GOTO="cdrom_end"
SUBSYSTEM!="block", GOTO="cdrom_end"
KERNEL!="sr[0-9]*|vdisk*|xvd*", GOTO="cdrom_end"
ENV{DEVTYPE}!="disk", GOTO="cdrom_end"

# unconditionally tag device as CDROM
KERNEL=="sr[0-9]*", ENV{ID_CDROM}="1"

# stop automatically any mount units bound to the device if the media eject
# button is pressed.
ENV{ID_CDROM}=="1", ENV{SYSTEMD_MOUNT_DEVICE_BOUND}="1"

# media eject button pressed
ENV{DISK_EJECT_REQUEST}=="?*", RUN+="cdrom_id --eject-media $devnode", GOTO="cdrom_end"

# import device and media properties and lock tray to
# enable the receiving of media eject button events
IMPORT{program}="cdrom_id --lock-media $devnode"

# ejecting a CD does not remove the device node, so mark the systemd device
# unit as inactive while there is no medium; this automatically cleans up of
# stale mounts after ejecting
ENV{DISK_MEDIA_CHANGE}=="?*", ENV{ID_CDROM_MEDIA}!="?*", ENV{SYSTEMD_READY}="0"

KERNEL=="sr0", SYMLINK+="cdrom", OPTIONS+="link_priority=-100"

LABEL="cdrom_end"