Which packages create/use this group?
The scanner group is created by libsane. Maybe the udev rule should be added by this package as well ?
I also have a question : where can I find any documentation on the SYSFS{type} node ? How is the number assigned ? Does "5" always corresponds to cdrom ? "6" to scanner ?
I also looked for "addgroup" in other dpkg install scripts, and there are several of them. Maybe this could help finding other userful udev rules for specific usages ?
# ls /var/lib/dpkg/info/ | xargs grep addgroup (...) cron.postinst: (...) addgroup --system crontab cupsys-client.postinst: addgroup --system lpadmin cupsys.postinst: addgroup --system lpadmin dbus-1.postinst: addgroup --system "$MESSAGEUSER" gdm.postinst: addgroup --system gdm libgphoto2-2.postinst: addgroup --system camera libsane.postinst: addgroup --quiet --system scanner mysql-server.preinst: addgroup --system mysql pmount.postinst: addgroup --quiet --system plugdev postgresql.preinst: addgroup --system postgres ssh.postinst: addgroup --system --quiet ssh
