How to trigger a system reboot and still allow a logged in Gnome Desktop user to cancel it? Purpose is for a scheduled reboot of a workstation that can be cancelled by the current user. I am thinking that a DBUS message could trigger Gnome Power Manager to prompt the user.
Ultimately I want to be able to detect if a user is logged in to the desktop(ck-list-sessions) and if so prompt to user about the reboot, else run ‘reboot’ . I wish that this was possible: gnome-session-save —reboot-dialog
de Palo Andrea
[ Editor ]
You could schedule another job to check if a reboot is scheduled in a few minutes and if a user is currently logged in; if this condition is achieved then send a notification to the logged user (via zenity) giving him the possibility to abort the reboot.
Instead of DBus you could use a simple lock/run/text file inside /var: both jobs (the reboot one and the check one) should read it; the check job should write some values inside it to let the check job know to abort the reboot.
I know it’s an hackish solution but it should work.
Adel Moin
[ Editor ]
Hmm… Not sure what you can do here… But you can try to install gnome-scheduler, which is a good tool for GNOME desktop… Then add the users to sudoers file.
After that, make a script like this:
read -p “Would you like to reboot? Tip: Type Y (if yes) or N (if no)” CHOICE
if [ $CHOICE = ‘Y’ ]
then
sudo init 6
fi
if [ $CHOICE = ‘N’ ]
then
echo “OK!”
fi
And then:
chmod 700 FILE
After that, give the path to the file, as the command which should be executed…
The bad thing about this, is that I think it will not work if a user is not logged in... Anyway, I don't know how this works... But maybe, you can at least use some solutions together and work something out...
It will just work if a user is logged in GNOME right now... If a user is logged in, they'll see a new shell, which is asking them if they'd like to reboot, and they can answer Y or N.
Erik Meitner
[ Editor ]
My solution is:
#!/usr/bin/perl -w use strict; my $session_list = `/usr/bin/ck-list-sessions`; my = split /^Session/m,$session_list; my $active_x; my %x_sessions; foreach my $session ( ) { next if $session =~ /session-type = 'LoginWindow'/; $session =~ /x11-display = '([^']+)'/; my $display = $1; if( $display ) { $session =~ /unix-user = '([^']+)'/; my $user = $1; $x_sessions{$display} = $user; next if( $session =~ /active = FALSE/); $active_x = $display; } } if( $active_x ) { $ENV{'DISPLAY'} = $active_x; my $uname = getpwuid( $x_sessions{$active_x} ); system( "zenity" ,"--question" ,"--text=This computer is scheduled to restart at this time. You may choose to prevent this if you wish.\n\nIf you take no action this computer will restart in one minute!" ,"--ok-label=Restart" ,"--cancel-label=NO!" ,"--title=Restart requested" ,"--timeout=10" ); if ( $? >> 8 == 1 ) { system("logger","-t","nice-reboot","$uname chose to cancel the reboot."); exit; } } for my $display ( keys %x_sessions ) { $ENV{'DISPLAY'} = $display; my $uname = getpwuid( $x_sessions{$display} ); system("logger","-t","nice-reboot","Logging out $uname."); system("sudo","-u",$uname,"gnome-session-save", "--force-logout"); } sleep 30; system("logger","-t","nice-reboot","Rebooting now"); system("reboot");
This gets scheduled to run as root at some time.
While I suspect that this same thing can be triggered in Gnome Power Manager via a DBUS call, that elegant solution may have to wait.