How to find out which udev rule is applied?

DISCUSSION [email protected] 2 participants 2 messages Jan 29, 2007

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[email protected]

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2007-01-29 22:12 UTC #0 lore raw

First, I hope I'm on the right mailinglist for my question, and apologize if I'm not ...

How can I find out which rule (at least which rule file) udev uses to generate/assign device nodes?
udevmonitor doesn't give me much information on that.

To make myself clear, my actual problem:
I have a printer/scanner combo, which is working but one problem: Since some time ago, /dev/usb/lp0 is assigned to root:scanner instead of root:lp, causing cups to fail.

I already edited some rules files in hope to sort it out, but without success.

Now I'd like to find out which rule is actually used to create the device node, so I can either modify it or make my own rule setting the permissions.

Is there a way to achieve this?

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Kay Sievers

2007-01-29 22:29 UTC #1 lore raw

Quoted 12 lines · On 1/29/07, [email protected] <[email protected]> wrote:

First, I hope I'm on the right mailinglist for my question, and apologize if I'm not ...
How can I find out which rule (at least which rule file) udev uses to generate/assign device nodes?
udevmonitor doesn't give me much information on that.
To make myself clear, my actual problem:
I have a printer/scanner combo, which is working but one problem: Since some time ago, /dev/usb/lp0 is assigned to root:scanner instead of root:lp, causing cups to fail.

Quoted 8 lines

I already edited some rules files in hope to sort it out, but without success.
Now I'd like to find out which rule is actually used to create the device node, so I can either modify it or make my own rule setting the permissions.
Is there a way to achieve this?

What does:
udevtest /sys/class/printer/lp0

print? If it shows the scanner gid, there must be a rule that assigns it. If not, blame pam_console or similar to mess up your permission after udev has created the node.

Kay