[udev] how to set a rule depending on the manufacturer or the serial number?

thomas.bucaioni

For example, how to adapt the line
SUBSYSTEM=="usb", SYMLINK+="myusb"
to filter according to the manufacturer or the serial number? Adding ATTR{Manufacturer}==6989 or ATTRS{Manufacturer}==6989 didn't work.

Also, the Nautilus call didn't work neither:
SUBSYSTEM=="usb", SYMLINK+="myusb", RUN+="/usr/bin/nautilus"

Any idea what goes wrong?

thomas.bucaioni

For the serial number, it's ATTR{serial}=="serialnumber" as shown with command udevadm info --attribute-walk --name /dev/myusb"

thomas.bucaioni

And for the manufacturer, it's ATTR{manufacturer}=="number"

lee42x

I was having an interesting time changing the usb-key's name as it was busy with systems-udev, but that is another day.
Here is an example of some udev commands to write a file. There is the udev-rule file and two tiny scripts. The idea was write to a file if the usb-key was plugged in or pulled out.

98-usb-stick.rules

#

#

#

used "udevadm info -a /dev/sdb > /tmp/udev"

to list related device information

#

skip to end if not a block device

#
SUBSYSTEM!="block", GOTO="endoffile
#

look for the root device, not the partitions

maybe add in "change" with "add"

KERNEL=="sd?", ACTION=="add" \
, ATTRS{manufacturer}=="Kingston"\
, ATTRS{product}=="DataTraveler 2.0"\
, ATTRS{serial}=="5B870E000068"\
, RUN+="/usr/local/bin/usb-on.sh"

KERNEL=="sd?", ACTION=="remove"\
, ATTRS{manufacturer}=="Kingston"\
, ATTRS{product}=="DataTraveler 2.0"\
, ATTRS{serial}=="5B870E000068"\
, RUN+="/usr/local/bin/usb-off.sh"

LABEL="endoffile"

usb-off.sh

!/bin/bash

echo "usb is offline " >>/tmp/usb.out
/bin/date >> /tmp/usb.out

usb-on.sh#!/bin/bash

echo "usb is offline " >>/tmp/usb.out
/bin/date >> /tmp/usb.out

Yours should be similar.
Regards, Lee

thomas.bucaioni

Hi Lee,
Your scripts work great, thank you very much for the trick.
At the end I tried to add /usr/bin/nautilus & but it doesn't launch, there must be something I don't know about Xorg that prevents it to do so...
Regards, Thomas

thomas.bucaioni

Tried xdg-open /tmp/usb.out at the end but it doesn't work neither

coop

I'm not 100 percent sure in this instance, but running Desktop GUI commands won't work when you launch things non-interactively from a script not attached to a terminal. This has nothing to do with udev, just try it from a bash script. They have to be run from the right context.

thomas.bucaioni

In this thread, it says to use ENV{SYSTEMD_WANTS}=="some.service": https://bbs.archlinux.org/viewtopic.php?id=206555

luisviveropena

Hi @thomas.bucaioni ,

It seems SYSTEMD_WANTS is intended for other stuff. From the udev(7) man page:

In order to activate long-running processes from udev rules,
provide a service unit and pull it in from a udev device
using the SYSTEMD_WANTS device property. See
systemd.device(5) for details.

Perhaps you can try with the RUN key, as shown in the man page:

RUN{type}
Specify a program to be executed after processing of all the
rules for the event. With "+=", this invocation is added to
the list, and with "=" or ":=", it replaces any previous
contents of the list. Please note that both "program" and
"builtin" types described below share a common list, so
clearing the list with ":=" and "=" affects both types.

       type may be:

       "program"
           Execute an external program specified as the assigned
           value. If no absolute path is given, the program is
           expected to live in /usr/lib/udev; otherwise, the
           absolute path must be specified.

           This is the default if no type is specified.

I understand you are playing around with udev, because this doesn't seem to be a real case example.

Regards,
Luis.

thomas.bucaioni

Hi @luisviveropena,
With SUBSYSTEM=="usb", ATTR{serial}=="number", SYMLINK+="myusb", RUN+="/usr/bin/nautilus", ACTION=="add" it doesn't work neither.
But yes, it's not a real case example indeed... It was to try to do the same as in Windows, no big deal
Regards,
Thomas

thomas.bucaioni

This works: https://bbs.archlinux.org/viewtopic.php?pid=1709570#p1709570
In Lee's script, it takes to add echo 'nautilus' >> execme.sh