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How can I execute a command in an LXC system container whenever a specific USB device is connected? Ordinarily, I'd use udev (cf. 1, 2, 3, 4, 5), but as far as I can tell, udev cannot be used inside a container.

More specifically, I have a privileged LXC system container running Ubuntu 14.04 (Trusty) on an Ubuntu 16.04 (Xenial) host system. The USB device in question (a Xilinx Platform Cable USB II) requires loading a firmware (by means of fxload).

In the configuration file for the container, I have

lxc.cgroup.devices.allow = c 189:* rwm
lxc.mount.entry = /dev/bus/usb dev/bus/usb none bind,optional,create=dir

This allows me to load the firmware manually from within the container, and subsequently to use the device. I would like to have the firmware loaded automatically when the device is connected.

As a workaround, I currently use udev on the host to load the firmware automatically with the following rule:

SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="03fd", ATTRS{idProduct}=="0013", RUN+="/sbin/fxload -v -t fx2lp -I /opt/Xilinx/firmware/xusb_xp2.hex -D $tempnode"

However, I would like to achieve this from within the container; ideally in a way that does not require any modification to the host system (except, of course, the container configuration).

Community
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Martin
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1 Answers1

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you can do a cron job script to detect a conditional lsusb stdout with a particular ID in a while loop on else condition...and trigger whatever you want.

dernyn
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