#!/bin/bash

set -e

function usage() {
    echo -n \
        "Usage: $(basename "$0")
Obtain mrc.bin from a Haswell Chromebook firmware image.
"
}

MRC_BIN_HASH="d368ba45096a3b5490ed27014e1f9004bc363434ffdce0c368c08a89c4746722"

if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
    if [[ "${1:-}" == "--help" ]]; then
        usage
    else
        BLOB_DIR="$(cd "$(dirname "$0")" && pwd)"
        COREBOOT_DIR="$(find "${BLOB_DIR}/../../build/x86/" -maxdepth 1 -type d -name 'coreboot-*')"

        pushd "${COREBOOT_DIR}"

        # https://doc.coreboot.org/northbridge/intel/haswell/mrc.bin.html#obtaining-mrc-bin
        make -C util/cbfstool
        cd util/chromeos
        ./crosfirmware.sh peppy
        ../cbfstool/cbfstool coreboot-*.bin extract -f mrc.bin -n mrc.bin -r RO_SECTION

        if ! echo "${MRC_BIN_HASH} mrc.bin" | sha256sum --check; then
            echo "SHA256 checksum for mrc.bin doesn't match."
            exit 1
        fi

        popd

        mv "${COREBOOT_DIR}/util/chromeos/mrc.bin" "$(dirname "$0")/mrc.bin"
    fi
fi