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I'm not an expert, but I wrote some udev rules a couple of weeks ago.
I think man udev gives some critical information that's not in the document you cited.
There are two sets of udev rules. The default set of rules is in /lib/udev/rules.d/. The custom rule set is in /etc/udev/rules.d/.
If your custom udev rules seem to have no effect, maybe your custom rules are failing to override the default udev rules in /lib/udev/rules.d/.
For example, the floppy devices fd* are created in /lib/udev/rules.d/50-udev-default-rules. In order to override those rules, your custom rules file would need to be in /etc/udev/rules.d/ 50-udev-default-rules.
Anyway, take a look at the man page for udev and see if you are properly taking into account the existence of the default rules already in /lib/udev/rules.d/.
Last edited by DavidHindman; 02-18-2009 at 11:40 PM.
Reason: Correct an error
I'm not absolutely sure, but I think your problem is that the underlying device node has not the permissions you want. It probably won't help to create just a symlink with other permissions if the real node has other ones.
That said I guess you have to change udev's default rules. Mine (Slackware 12.1) are in /etc/udev/rules.d/50-udev-default.rules, yours should AFAIK be in /lib/udev/rules.d if you are running Slackware 12.2. Look there for the floppy and sd* node creation and change it to your needs ... (to make a copy of this file first is a good idea)
...What I have made so far (in /etc/udev/rules.d/98-local-rules) is the following...
For the version of udev on Slack 12.2, a rule file must end with the extension .rules
That is, for my version of udev, the file "98-local-rules" would have to be named "98-local-rules.rules", else it would have no effect.
I took your floppy rule and put it into my /etc/udev/rules.d/98-local-rules.rules. I also changed it to generate devices named /dev/xfd* instead of /dev/fd*, so I could isolate the effect of your new rule. It sort of worked, giving the 666 permissions you intended. The device name came out as /dev/xfd/0 instead of /dev/xfd0, but it's close!
But so far this seems to have had no effect on the 'real world' /read/write/execute permissions and ownerships of these devices.
/dev/sda1 on /media/512_Cruzer type vfat (rw,nosuid,nodev,noatime,flush,uid=1000,utf8,shortname=lower)
ls -l /dev/sda1
brwxrwxrwx 1 user plugdev 8, 1 2009-02-23 13:25 /dev/sda1
ls -l /media/512_Cruzer
-rwxr-xr-x 1 user root 5619080 2009-02-16 13:38 Opera_963_en_Setup.exe
As you can see from the above code, the /dev's are now getting the correct permissions that I have set, but their corresponding /media mountpoints still retain the original permissions (which are no good).
Can anyone offer a suggestion as to how I can make a systemwide policy of making these user (vfat) floppy and USB mountpoints automatically default to rwx for all users?
(Please don't mention fstab as I need this to be done automatically via UDEV/HAL/DBUS? as devices are inserted by the user; without requiring user intervention, or (su)root access editing).
p.s. I'm currently working on a Slackware 12.0.0 system, but would like to migrate this (rule/policy?) [once I get it working] to multiple Slackware 12.1.0 and Slackware 12.2.0 systems.