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#!/usr/bin/env bash
set -e
# This assumes that /proc/cmdline contains a cryptdevice with a UUID identifier,
# like:
#
# cryptdevice=UUID=1ff1d6f7-7540-4500-8011-1abe1e9ac00d:cryptroot
uuid=$(cat /proc/cmdline | \
tr ' ' '\n' | \
grep cryptdevice | \
cut -d= -f3 | \
cut -d: -f1)
device=$(lsblk -o PATH,UUID | grep "$uuid" | awk '{print $1}')
echo "Root device is $device"
echo -n "Enter root key: "
read -s pw
echo ""
# This will check if the key is right, and cause the process to exit if not due
# to the "set -e"
echo "Checking key..."
echo "$pw" | sudo cryptsetup open --test-passphrase "$device"
echo "Good job, writing /boot/keyfile..."
echo -n "$pw" | sudo tee /boot/keyfile >/dev/null
echo "Shutting down..."
sudo systemctl poweroff
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