Experimental Physics and
Industrial Control System

On 9/25/23 15:15, Lucas Russo via Tech-talk wrote:

Hi Mark,

Three sets of commands that helped me in the past:

When making changes, don't forget to reload the modified files with:

udevadm control --reload

$ udevadm monitor

Will show you events for a device

$ udevadm test --action=add <device path>

For example, I have a yubikey with a special udev rule:

$ cat /etc/udev/rules.d/yubikey.rules SUBSYSTEMS=="usb", ATTRS{idVendor}=="1050", ATTRS{idProduct}=="0407", GROUP="plugdev", TAG+="uaccess"

I see the following, where group "plugdev" has gid 46.

sudo udevadm test --action=add /dev/bus/usb/001/008

...

Reading rules file: /etc/udev/rules.d/yubikey.rules

...

1-6: /etc/udev/rules.d/yubikey.rules:1 GROUP 46
1-6: Setting permissions /dev/bus/usb/001/008, uid=0, gid=46, mode=0664

References:

USB permissions Mark Rivers via Tech-talk

Re: USB permissions Lucas Russo via Tech-talk

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