#!/usr/bin/ash

run_hook() {
    modprobe -a -q dm-crypt >/dev/null 2>&1

    if [ -n "${cryptdevice}" ]; then
        DEPRECATED_CRYPT=0
        IFS=: read cryptdev cryptname <<EOF
$cryptdevice
EOF
    else
        DEPRECATED_CRYPT=1
        cryptdev="${root}"
        cryptname="root"
    fi

    # This may happen if third party hooks do the crypt setup
    if [ -b "/dev/mapper/${cryptname}" ]; then
        echo "Device ${cryptname} already exists, not doing any crypt setup."
        return 0
    fi

    warn_deprecated() {
        echo "The syntax 'root=${root}' where '${root}' is an encrypted volume is deprecated"
        echo "Use 'cryptdevice=${root}:root root=/dev/mapper/root' instead."
    }

    if resolved=$(resolve_device "${cryptdev}" ${rootdelay}); then
        if cryptsetup isLuks ${resolved} >/dev/null 2>&1; then
            [ ${DEPRECATED_CRYPT} -eq 1 ] && warn_deprecated
            dopassphrase=1
            # Ask for a passphrase
            if [ ${dopassphrase} -gt 0 ]; then
                echo ""
                echo "A password is required to access the ${cryptname} volume"
                #loop until we get a real password
                while ! [ -b "/dev/mapper/${cryptname}" ]; do
                    unl0kr | cryptsetup open "${cryptdev}" "${cryptname}"
                    export CRYPTTAB_TRIED=1
                done
            fi
            if [ -e "/dev/mapper/${cryptname}" ]; then
                if [ ${DEPRECATED_CRYPT} -eq 1 ]; then
                    export root="/dev/mapper/root"
                fi
            else
                err "Password succeeded, but ${cryptname} creation failed, aborting..."
                return 1
            fi
        else
            err "Failed to open encryption mapping: The device ${cryptdev} is not a LUKS volume."
        fi
    fi
}