dotfiles/root/etc/initcpio/hooks/lukskeyfile

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#!/bin/ash
run_hook() {
if [ -n "$lukskeyfile" ]; then
# This is a needed kernel parameter for this hook
modprobe -a -q loop dm-crypt >/dev/null 2>&1
# Refer to help from `mkinitcpio -H lukskeyfile`.
IFS=: read rootKeyDev rootKey cryptkeyLoc <<EOF
$lukskeyfile
EOF
if [ -z "${cryptkeyLoc}" ]; then
cryptkeyLoc=/crypto_keyfile.bin
fi
if resoleved=$(resolve_device "${rootKeyDev}" $rootdelay); then
if mount -o noatime "${rootKeyDev}" /mnt>/dev/null 2>&1; then
cat "/mnt/${rootKey}" > "${cryptkeyLoc}"
else
echo "Failed to mount ${rootKeyDev} on /mnt"
/bin/sh
fi
else
echo "Failed to find ${rootKeyDev} containing LUKS root key."
fi
fi
}