View source for CentOS 8.x Disable graphical power-off option for non-admin users

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Normally when users do graphical login, they can use the menu option to power-off the system.  If we want to disable non-admin (non-root) users from powering of the system we can use:
# Create '<tt>/etc/polkit-1/rules.d/55-inhibit-shutdown.rules</tt>' with:
#:<pre>
#:: polkit.addRule(function(action, subject) {
#:: if ((action.id == "org.freedesktop.consolekit.system.stop" || action.id == "org.freedesktop.consolekit.system.poweroff") && subject.isInGroup("admin")) {
#:: return polkit.Result.YES;
#:: }
#:: else {
#:: return polkit.Result.NO;
#:: }
#:: }); 
#:</pre>

Refer: https://forums.centos.org/viewtopic.php?t=58193





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