dotfiles/root/etc/initcpio/hooks/lukskeyfile

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#!/bin/ash
run_hook() {
# This is a needed kernel parameter for this hook
if [ -n "$lukskeyfile" ]; then
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
# Ask user whether to detect the device (detecting may
# take up a while and asking is faster)
while true; do
read -t5 -p "Use external key file? (default: yes, waiting 5s): " yn
if [ $? -gt 0 ]; then
echo "Timed out, assuming yes"
break
fi
case $yn in
[Yy]*)
break
;;
[Nn]*) return 0;;
"")
echo "Default (yes)"
break
;;
*) echo "Please answer yes or no.";;
esac
done
# Resolve and mount the device, in case we can't mount, show error
echo "Mounting device..."
if resoleved=$(resolve_device "${rootKeyDev}" $rootdelay); then
if mount -o noatime "${rootKeyDev}" /mnt>/dev/null 2>&1; then
# Copy the keyfile present in the device into the
# ramfs filesystem to be read by dm-crypt
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
}