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#!/usr/bin/env sh
# SPDX-License-Identifier: GPL-2.0-only
# Forked from util/chromeos/crosfirmware.sh in coreboot cfc26ce278. Changes to
# it in this version are exclusively by Leah Rowe, copyright as of 2021 and
# 2023, on top of original coreboot copyright auditable in coreboot.git.
[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e
. "include/err.sh"
export PATH="${PATH}:/sbin"
# use updated manifest from wayback machine, when updating mrc.bin,
# and update the other variables below accordingly. current manifest used:
# https://web.archive.org/web/20210211071412/https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf
# the wayback machine is used so that we get the same manifest. google
# does not seem to version the manifest, but archives are available
# variables taken from that manifest:
_board="peppy"
_file="chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin"
_url="https://dl.google.com/dl/edgedl/chromeos/recovery/chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin.zip"
_url2="https://web.archive.org/web/20200516070928/https://dl.google.com/dl/edgedl/chromeos/recovery/chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin.zip"
_sha512sum="340a1cd41136a3ba0de9d306db0e65f51640a2efe63aee9934f326b276adc1af0a2df80c0731c5a749161ec32546909eedfa8ba95801faeb5dcfe1aa4e0840c7"
_mrc_complete_hash="e5b6d510a5fdb6a7ba0027588dbceef363a2bf30255e9222020abbe71468822f49962d423d872cc05b37098682281c016445f6aa20f88351a134facfe5f70d5b"
_mrc_complete="mrc/haswell/mrc.bin"
# NOTE: the checksums, defined above, are actually sha-2 (sha512sum)
# but google only defines sha1 and md5. we verify with sha1sum, but then
# we use sha512sum in lbmk
cbdir="coreboot/default"
cbfstool="cbutils/default/cbfstool"
sname=""
main()
{
sname=${0}
printf "Downloading Intel MRC blobs\n"
check_existing || return 0
build_dependencies
fetch_mrc || err "could not fetch mrc.bin"
}
check_existing()
{
[ -f "${_mrc_complete}" ] || \
return 0
printf "found existing mrc.bin\n" 1>&2
[ "$(sha512sum "${_mrc_complete}" | awk '{print $1}')" \
= "${_mrc_complete_hash}" ] && \
return 1
printf "hashes did not match, starting over\n" 1>&2
}
build_dependencies()
{
[ -d "${cbdir}/" ] || ./update project trees coreboot default || \
err "build_dependencies: cannot fetch coreboot/default"
./build coreboot utils default || \
err "build_dependencies: cannot build cbutils/default"
}
fetch_mrc()
{
mkdir -p mrc/haswell/ || err "fetch_mrc: !mkdir mrc/haswell"
(
cd mrc/haswell/ || err "fetch_mrc: !cd mrc/haswell"
download_image "${_url}" "${_file}" "${_sha512sum}"
[ -f ${_file} ] || \
download_image "${_url2}" "${_file}" "${_sha512sum}"
[ -f $_file ] || \
err "fetch_mrc: ${_file} not downloaded / verification failed."
extract_partition ROOT-A "${_file}" root-a.ext2
extract_shellball root-a.ext2 chromeos-firmwareupdate-${_board}
extract_coreboot chromeos-firmwareupdate-${_board}
../../"${cbfstool}" coreboot-*.bin extract -f mrc.bin -n mrc.bin \
-r RO_SECTION || err "fetch_mrc: could not fetch mrc.bin"
rm -f "chromeos-firmwareupdate-${_board}" coreboot-*.bin \
"${_file}" "root-a.ext2" || err "fetch_mrc: cannot remove files"
printf "\n\nmrc.bin saved to ${_mrc_complete}\n\n"
)
}
download_image()
{
url=${1}
_file=${2}
_sha512sum=${3}
printf "Downloading recovery image\n"
curl --retry 3 "$url" > "$_file.zip" || err "download_image: curl failed"
printf "Verifying recovery image checksum\n"
if [ "$(sha512sum "${_file}.zip" | awk '{print $1}')" = "${_sha512sum}" ]
then
unzip -q "${_file}.zip" || err "download_image: cannot unzip"
rm -f "${_file}.zip" || err "download_image: can't rm zip {1}"
return 0
fi
rm -f "${_file}.zip" || err "download_image: bad hash, and can't rm zip"
err "download_image: Bad checksum. Recovery image deleted"
}
extract_partition()
{
NAME=${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 "${_shellball}" ] || \
err "extract_coreboot: shellball missing in google peppy image"
sh "${_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 peppy rom"
rm -Rf "${_unpacked}" || \
err "extract_coreboot: cannot remove extracted google peppy archive"
}
main $@
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