Autologin depending on the unlocking LUKS key slot

(Attention: this is a only a proof of concept without error checking and testing... Use with care and on your own risk!!!)

Modify initramfs:

Script to generate LightDM-Config

/usr/share/lightdm/gen-50-autologin.sh

#!/bin/bash
set -e
if grep "Key slot 0 unlocked" /run/initramfs/cryptsetup.out; then
  echo -e "[Seat:*]\nautologin-user=##USER0##" > /usr/share/lightdm/lightdm.conf.d/50-autologin.conf
elif grep "Key slot 1 unlocked" /run/initramfs/cryptsetup.out; then
  echo -e "[Seat:*]\nautologin-user=##USER1##" > /usr/share/lightdm/lightdm.conf.d/50-autologin.conf
else
  rm -f /usr/share/lightdm/lightdm.conf.d/50-autologin.conf
fi

Modify systemd-config to include this script

/lib/systemd/system/lightdm.service
Replace ExecStart-entry by:

ExecStart=/bin/sh -c '/usr/share/lightdm/gen-50-autologin.sh; /usr/sbin/lightdm'

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Operation System

Linux distribution (not cygwin)
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