working demo

README.md

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+# xlock screen locker
+
+`xlock` really does nothing, it uses and wraps [`i3lock`]() into [systemd]() to allow a seamless screen lock. You have as a background the screenshot of your current screen, the mouse pointer works, nothing can happen. You just have to type your password, press enter and here you go.
+
+
+Your friends and coworkers can be attempted, they won't succeed !
+
+
+### Installation
+
+run `./install.sh` ; you need sudo permissions.
+
+### How to use
+A lock file is created at '/tmp/.unlocked'. To lock your screen, simply delete this file. After the install the service 'xlock@<user>.path' with `<user>` being your username during install. To start it `systemctl start xlock@user.path`, at the install it is enabled by default, so launched at boot.
+
+To add a key binding or to automate your script lock, simply delete the `/tmp/.unlocked` file.
+
+
+
+### Security issues
+
+Killin the `i3lock` process does not remove the locker.

install.sh

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+#!/bin/bash
+
+user=`whoami`
+local_d="$(realpath `dirname $0`)";
+bin_d="/usr/sbin/";
+systemd_d="/usr/lib/systemd/system";
+
+# copy lock script
+printf "(1) copying xlock executable\n";
+sudo cp "$local_d/src/xlock" "$bin_d/xlock";
+sudo chmod +x "$bin_d/xlock";
+
+# copy systemd files
+printf "(2) copying systemd units\n";
+sudo cp $local_d/systemd/* "$systemd_d";
+
+# enable path
+printf "(3) enabling systemd watcher\n";
+sudo systemctl enable "xlock@$user.path" > /dev/null 2>&1;
+
+printf "\n .  install sucessful\n"

src/xlock

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+#!/bin/bash
+screenshot_f="/tmp/.lock.screenshot.png";
+unlock_f="/tmp/.unlocked";
+
+# if lock file -> exit
+if [ -f "$unlock_f" ]; then
+	exit 0;
+fi;
+
+
+# take screenshot (if not exists)
+if [ ! -f $screenshot_f ]; then
+	scrot $screenshot_f;
+fi;
+
+# lock w/ screenshot
+i3lock -n -u -p default -e -i $screenshot_f;
+# -n         : no fork (does not work with systemd eitherway)
+# -u         : do not display lock indicator
+# -p default : do not hide mouse pointer
+# -e         : ignore empty passwords
+
+# if 'i3lock' has been killed or has error
+if [ "$?" -ne 0 ]; then
+
+
+	# re-lock
+	exec $0;
+	exit 0;
+fi;
+
+# create lock file
+touch $unlock_f;
+chmod o=rwx $unlock_f;
+
+# remove screenshot
+rm -f $screenshot_f;

systemd/xlock@.path

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+[Unit]
+Description=Locker lock file watcher
+
+[Path]
+PathModified=/tmp
+Unit=xlock@%i.service
+
+[Install]
+WantedBy=multi-user.target

systemd/xlock@.service

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+[Unit]
+Description=Locker daemon
+
+[Service]
+Type=oneshot
+RemainAfterExit=false
+User=%i
+Group=%i
+
+Environment="DISPLAY=:0"
+Environment="XAUTHORITY=/home/%i/.Xauthority"
+ExecStart=/usr/sbin/xlock