[GTALUG] Locking KDE 5 screen from shell script

[Randy Jonasz]

Thanks for the tip Mauro, Lennart! It turns out the problem was with not 
having the DISPLAY variable set properly.  So in lockkde.sh I invoke 
qdbus this way

Konsole output
DISPLAY=:0 /usr/bin/qdbus org.freedesktop.ScreenSaver /ScreenSaver Lock

And now it works!

Thanks again,

Randy

On 12/08/15 07:35 AM, Mauro Souza wrote:
>
> You could change this line
> ps aux | grep cinnamon-session | grep -v grep
>
> to this
> pgrep cinnamon-session
>
> It's cleaner and works well.
>
> To answer the main question, try to install bashdb and run the script 
> thru it. It's the bash debugger, it's far more powerful than bash -vx.
>
> On Aug 12, 2015 04:22, "Randy Jonasz" <rjonasz at rjonasz.org 
> <mailto:rjonasz at rjonasz.org>> wrote:
>
>     I recently installed kde5 on debian stretch.  I have a yubikey
>     which I use to log in with.  I'd like to lock the screen when I
>     remove the yubikey.  I have it working with cinnamon and lxde but
>     I can't quite get it with kde.  I can lock the screen if I run the
>     shell script from a terminal as root but when I remove the yubikey
>     the shell script returns error code 1.
>
>     Here's my shell scripts:
>
>     ykgone.sh
>
>     #! /bin/sh
>     if [ -z "$(lsusb | grep Yubikey)" ] ; then
>            if [ ! -z "$(ps aux | grep cinnamon-session | grep -v
>     grep)" ] ; then
>                    /bin/su rjonasz -c "DISPLAY=:0
>     cinnamon-screensaver-command -l"
>            elif [ ! -z "$(ps aux | grep startkde | grep -v grep)" ] ;
>     then
>                    /usr/bin/sudo -u rjonasz -H -i
>      /usr/local/bin/lockkde.sh
>            else
>                    /bin/su rjonasz -c "DISPLAY=:0 xscreensaver-command
>     --lock"
>            fi
>     fi
>
>
>     lockkde.sh
>
>     #! /bin/sh
>
>     kde_pid=`pidof kdeinit5`
>     export `cat /proc/$kde_pid/environ|grep -ao
>     'DBUS_SESSION_BUS_ADDRESS=[[:graph:]]*'`
>     /usr/bin/qdbus org.freedesktop.ScreenSaver /ScreenSaver Lock
>
>
>     I can't seem to figure this one out.
>
>     Thanks for any help!
>
>     Randy
>
>     -- 
>     Even philosophers will praise war as ennobling mankind, forgetting
>     the Greek who said: 'War is bad in that it begets more evil than
>     it kills.'
>
>     Immanuel Kant
>
>
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-- 
Even philosophers will praise war as ennobling mankind, forgetting
the Greek who said: 'War is bad in that it begets more evil than
it kills.'

Immanuel Kant

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