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# SPDX-License-Identifier: GPL-2.0-only
# Logic based on util/chromeos/crosfirmware.sh in coreboot cfc26ce278.
# Modifications in this version are Copyright 2021 and 2023 Leah Rowe.
# Original copyright detailed in repo: https://review.coreboot.org/coreboot/
extract_mrc()
{
[ -z "${MRC_board}" ] && err "extract_mrc $MRC_hash: MRC_board not set"
[ -z "${CONFIG_MRC_FILE}" ] && \
err "extract_mrc $MRC_hash: CONFIG_MRC_FILE not set"
_file="${MRC_url##*/}"
_file="${_file%.zip}"
(
cd "${appdir}" || err "extract_mrc: !cd ${appdir}"
extract_partition ROOT-A "${_file}" root-a.ext2
extract_shellball root-a.ext2 chromeos-firmwareupdate-${MRC_board}
extract_coreboot chromeos-firmwareupdate-${MRC_board}
)
"${cbfstool}" "${appdir}/"coreboot-*.bin extract -n mrc.bin \
-f "${_dest}" -r RO_SECTION || \
err "extract_mrc: could not fetch mrc.bin"
}
extract_partition()
{
NAME=${1}
FILE=${2}
ROOTFS=${3}
_bs=1024
printf "Extracting ROOT-A partition\n"
ROOTP=$( printf "unit\nB\nprint\nquit\n" | \
parted "${FILE}" 2>/dev/null | grep "${NAME}" )
START=$(( $( echo ${ROOTP} | cut -f2 -d\ | tr -d "B" ) ))
SIZE=$(( $( echo ${ROOTP} | cut -f4 -d\ | tr -d "B" ) ))
dd if="${FILE}" of="${ROOTFS}" bs=${_bs} skip=$(( ${START} / ${_bs} )) \
count=$(( ${SIZE} / ${_bs} )) || \
err "extract_partition: can't extract root file system"
}
extract_shellball()
{
ROOTFS=${1}
SHELLBALL=${2}
printf "Extracting chromeos-firmwareupdate\n"
printf "cd /usr/sbin\ndump chromeos-firmwareupdate ${SHELLBALL}\nquit" \
| debugfs "${ROOTFS}" || err "extract_shellball: debugfs"
}
extract_coreboot()
{
_shellball=${1}
_unpacked=$( mktemp -d )
printf "Extracting coreboot image\n"
[ -f "${_shellball}" ] || \
err "extract_coreboot: shellball missing in google cros image"
sh "${_shellball}" --unpack "${_unpacked}" || \
err "extract_coreboot: shellball exits with non-zero status"
# TODO: audit the f* out of that shellball, for each mrc version.
# it has to be updated for each mrc update. we should ideally
# implement the functionality ourselves.
[ -f "${_unpacked}/VERSION" ] || \
err "extract_coreboot: VERSION file missing on google coreboot rom"
_version=$( cat "${_unpacked}/VERSION" | grep BIOS\ version: | \
cut -f2 -d: | tr -d \ )
cp "${_unpacked}/bios.bin" "coreboot-${_version}.bin" || \
err "extract_coreboot: cannot copy google cros rom"
}
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