..recent udev seems to fail to generate these symlinks for internal devices
because ID_PATH is not set and write_cd_rules needs it for the default
"by-path" method else f.e.
# udevadm test $(udevadm info -q path -n /dev/sr0)
will echo "$DEVPATH not supported by path_id. by-id may work."
The "by-id" method works, however in the factory
/lib/udev/rules.d/75-cd-aliases-generator.rules this is only used for
usb/firewire optical drives, for whatever (deprecated?) reason.
Just override the default rule by creating this simplified
/etc/udev/rules.d/75-cd-aliases-generator.rules:
>>>
# These rules generate rules for the /dev/{cdrom,dvd,...} symlinks and
# write them to /etc/udev/rules.d/70-persistent-cd.rules.
ACTION=="add", SUBSYSTEM=="block", ENV{GENERATED}!="?*", ENV{ID_CDROM}=="?*", \
PROGRAM="write_cd_rules by-id", SYMLINK+="$result"
<<<
fixed it for me.
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https://bugs.launchpad.net/bugs/926976
Title:
udev does not create the proper symlinks to /dev/dvd due to the wrong
: ENV{ID_PATH} in70-persistent-cd.rules
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