dotfiles/root/etc/initcpio/install/lukskeyfile

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#!/bin/bash
build() {
add_dir "/mnt"
add_module loop
add_module dm-crypt
add_runscript
}
help() {
cat <<EOF
Open root partition with LUKS root key present on internal
or external accessible non-encrypted partition.
To use this hook, specify lukskeyfile in kernel parameters.
This hook is designed to copy over the specified key file into
initramfs internal path designated as cryptkey by encrypt hook.
lukskeyfile=rootKeyDev:rootKey[:cryptkeyLoc]
rootKeyDev = /path/to/rootKeyDev, UUID=uuid-of-rootKeyDev
rootKey = /path/to/rootKey in rootKeyDev
cryptkeyLoc = /path/to/cryptkey in initramfs.
Default values
cryptkeyLoc=/crypto_keyfile.bin
EOF
}