Primary button goes back to default on external mouse

I use a KVM switcher box and so I have the same issue every time I switch since upgrading.

At the moment I have this quick and dirty script. Run it in a terminal as the logged in user;

xinput list | grep Mouse | sed -nre 's/^.*sid=([0-9]+)s.*$/1/p' | xargs -r -I '{}' echo xinput set-button-map {} 3 2 1

Hope to get something better but should be useful for now.

For completeness, it's worth noting that you can also use the mouse settings UI tool, and change the primary button to right handed and then back to left handed.

UPDATE/EDIT BELOW

I now have a more convenient solution that is automated for each kvm switch, but it's still a hacky/dirty solution, and I run a script after login...

Customise the following for your vendor id and product id, based on output of lsusb. Where the hex number with a colon in the middle is the {idvendor}:{idproduct} for your mouse. Also, as flipjacob adds, customise "Mouse" string in the grep statement to your match what you get from xinput.

Create a file (as root) /etc/udev/rules.d/80-force-left-handed-mouse-on-plugin-event.rules with the following contents

ATTRS{idVendor}=="045e", ATTRS{idProduct}=="0047", ACTION=="bind", RUN+="/root/notify-mouse-plugged.sh"

Create the script that it will run (as root) /root/notify-mouse-plugged.sh.

#!/bin/bash

umask 0000
echo $ACTION >> /tmp/mouse-flag
date >> /tmp/mouse-flag

And finally create the script to pick up the 'notification' in the context of the logged in user. I run this after logging in in a terminal and leave it running there.

Listener script $HOME/listen-for-mouse-plugged.sh.

#!/bin/bash

echo "" > /tmp/mouse-flag

tail -qfn 0 /tmp/mouse-flag 2>/dev/null | while read s
do
  #inotifywait -e create /tmp/mouse-flag
  echo reset mouse $s
  xinput list | grep Mouse | sed -nre 's/^.*sid=([0-9]+)s.*$/1/p' | xargs -I '{}' xinput set-button-map {} 3 2 1

  #sleep 5
done

It fires the listener loop 3 times for me, but that is of little consequence for something I hope to throw away soon.