Linux: How To Setup A Lockscreen To Run On Sleep/Suspend

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Australia Brodie Robertson
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If you care even remotely about your security you probably will want to probably want to at least setup a lockscreen for your computer, whilst this isn't perfectly safe it'll keep out the general prying eyes, and if you have a lockscreen you may want it to run when your computer goes to sleep or suspend mode and that's what we're doing today. If you care even more about security you will likely also want to disable the ability to kill your xorg server and switch tty so that it's a bit harder to circumvent your lockscreen, I do address this but I also think it's dangerous for reasons besides security but it's your system so feel free to configure it as you wish.

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==========Resources==========
Slock Arch Wiki:
https://wiki.archlinux.org/index.php/Slock

Linux Lockscreens Arch Wiki:
https://wiki.archlinux.org/index.php/List_of_applications#Screen_lockers

Slock Service:
[Unit]
Description=Lock X session using betterlockscreen for user %i
Before=sleep.target
Before=suspend.target

[Service]
User=%i
Type=simple
Environment=DISPLAY=:0
ExecStartPre=/usr/bin/xset dpms force suspend
ExecStart=/usr/bin/slock
TimeoutSec=infinity

[Install]
WantedBy=sleep.target
WantedBy=suspend.target

Xorg Conf Changes:
Section "ServerFlags"
Option "DontVTSwitch" "True"
Option "DontZap" "True"
EndSection

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