On 05/08/2018 at 20:44, Antony Stone wrote:

> On Sunday 05 August 2018 at 20:24:30, Alessandro Selli wrote:
>
>> On 05/08/2018 at 16:29, Antonio Trkdz.tab wrote:
>>> Dear All,
>>>
>>> I am struggling to understand how to run a script automatically upon
>>> plugging a USB keyboard.
>>> I know this issue is not directly related to Devuan, but I will
>>> certainly appreciate a little help.
>>>
>>> I created the following rule as /etc/udev/rules.d/90-usb-keyboard.rules:
>>> ATTRS{idVendor}=="XXXX", ATTRS{idProduct}=="XXXX", ACTION=="add",
>>> RUN+="/full/path_to/restore_space_as_modifier.sh"
>>> and reloaded eudev (I am on ASCII).
>>>
>>> The script essentially has to do this:
>>>
>>> #!/bin/bash
>>> /usr/bin/xmodmap -e "keycode 65=Super_L"
>>> /usr/bin/xmodmap -e "keycode any=space"
>>> /usr/bin/pkill xcape
>>> /usr/bin/xcape -e "Super_L=space"
>> I think the problem lies in the x* from the commands: they are X11
>> commands, i.e. they interact with a running Xorg. But, as they are run
>> by udevd, i.e. by a system daemon, they do not have the DISPLAY variable
>> initialized and do not have the appropriate session Xauthority cookies
>> set. Thus they fail.
> That sounds plausible, but doesn't explain:
>
>>> it is not working, nothing happens, not even a simple echo something to a
>>> file, the only command I have got working is touching a file with
>>> 'RUN+="/usr/bin/touch path_to/filename"

  How are you running the echo command from the udev rule?


Alessandro