Starting Synergy during gdm startup (greeter) in CentOS8

Question

This is similar to Starting synergy automatically on RHEL/CentOS However this doesn't seem to be working anymore.

What I basically want to do is execute a program when the greeter is shown. THis has been working before by adding it to the /etc/gdm/Init/Default script. However right now the script doesn't seem to be called anymore (tested with a 'logger' call).

SElinux is in permissive mode. The script is executable. synergyc is specified with the full path.

Answer 1

The below resolves the issue. So to make synergyc always running at the GDM greeter use the PostSession script below and put the /usr/share/gdm/greeter/autostart/synergyc.desktop file into place:

[Desktop Entry]
Type=Application
Name=Synergy Client
Exec=synergyc 192.168.1.110
X-GNOME-AutoRestart=true

/etc/gdm/PostSession/Default:

#!/bin/sh

# Kill old process
/usr/bin/killall synergyc
while [ $(pgrep -x synergyc) ]; do sleep 0.1; done

# Get the xauthority file GDM uses, setup DISPLAY var and start synergyc again
xauthfile=$(ps aux |grep Xauth | grep '^gdm' | grep -oP '\-auth \K[\w/]+')
export DISPLAY=:0
export XAUTHORITY=${xauthfile}
/usr/bin/synergyc 192.168.1.110

exit 0