Hi Seems like a bug, imho. My cdrom is only accessible by root. My /etc/udev/rules.d/70-persistent-cd.rules does not have GROUP="cdrom" clause. Reproducible: Always
Small patch does the trick. --- /lib/udev/write_cd_rules.bak 2010-02-04 19:22:37.000000000 +0200 +++ /lib/udev/write_cd_rules 2010-02-04 19:23:01.000000000 +0200 @@ -43,7 +43,7 @@ fi [ "$comment" ] && echo "# $comment" - echo "$match, SYMLINK+=\"$link\", ENV{GENERATED}=\"1\"" + echo "$match, SYMLINK+=\"$link\", GROUP=\"cdrom\", ENV{GENERATED}=\"1\"" } >> $RULES_FILE SYMLINKS="$SYMLINKS $link" }
IIRC, permissions on the symlink shouldn't matter in such case, just the ones on the real device.
My mistake, seems they do.
As only permissions of the device matter, this is just fine. $ ls -l /dev/cdrom /dev/dvd /dev/sr0 lrwxrwxrwx 1 root root 3 30. Jan 15:15 /dev/cdrom -> sr0 lrwxrwxrwx 1 root root 3 30. Jan 15:15 /dev/dvd -> sr0 brw-rw----+ 1 root cdrom 11, 0 30. Jan 15:15 /dev/sr0 $ grep cdrom /lib/udev/rules.d/* [...] /lib/udev/rules.d/50-udev-default.rules:SUBSYSTEM=="block", KERNEL=="sr[0-9]*", SYMLINK+="scd%n", GROUP="cdrom" /lib/udev/rules.d/50-udev-default.rules:SUBSYSTEM=="block", KERNEL=="hd*", SUBSYSTEMS=="ide", ATTRS{media}=="cdrom", GROUP="cdrom" /lib/udev/rules.d/50-udev-default.rules:SUBSYSTEM=="scsi_generic", SUBSYSTEMS=="scsi", ATTRS{type}=="4|5", GROUP="cdrom" /lib/udev/rules.d/50-udev-default.rules:KERNEL=="pktcdvd[0-9]*", GROUP="cdrom" /lib/udev/rules.d/50-udev-default.rules:KERNEL=="pktcdvd", GROUP="cdrom" [...] So all relevant devices get GROUP=cdrom assigned
Hm. I see your point. You are right. I have these rules. But sr0 still does not get cdrom group without some hack like mine. I'll try to investigate.
Investigation (udevadm test /sys/block/sr0 2>&1 | grep apply) showed that I had old file /etc/udev/rules.d/50-udev-default.rules hanging around. It had a rule for cdrom and lacked cdrom group setting. After removing it, more recent /lib/udev/rules.d/50-udev-default.rules came into play. So it works now without any problems. Sorry for noise.
