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https://codeberg.org/libreboot/lbmk.git
synced 2026-03-28 23:19:03 +02:00
2e779a5495
most of these are probably redundant, and will never be called, but lbmk needs to be as safe as possible under fault conditions. fail early, fail hard. Signed-off-by: Leah Rowe <leah@libreboot.org>
77 lines
2.3 KiB
Bash
Executable File
77 lines
2.3 KiB
Bash
Executable File
# SPDX-License-Identifier: GPL-2.0-only
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# Logic based on util/chromeos/crosfirmware.sh in coreboot cfc26ce278.
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# Modifications in this version are Copyright 2021 and 2023 Leah Rowe.
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# Original copyright detailed in repo: https://review.coreboot.org/coreboot/
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eval "$(setvars "" MRC_url MRC_url_bkup MRC_hash MRC_board ROOTFS SHELLBALL)"
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extract_mrc()
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{
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[ -z "${MRC_board}" ] && err "extract_mrc $MRC_hash: MRC_board not set"
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[ -z "${CONFIG_MRC_FILE}" ] && \
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err "extract_mrc $MRC_hash: CONFIG_MRC_FILE not set"
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ROOTFS="root-a.ext2"
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SHELLBALL="chromeos-firmwareupdate-${MRC_board}"
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(
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x_ cd "${appdir}"
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extract_partition
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extract_shellball
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extract_coreboot
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) || err "mrc download/extract failure"
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"${cbfstool}" "${appdir}/"coreboot-*.bin extract -n mrc.bin \
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-f "${_dest}" -r RO_SECTION || err "extract_mrc: cbfstool ${_dest}"
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}
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extract_partition()
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{
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NAME="ROOT-A"
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FILE="${MRC_url##*/}"
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FILE="${FILE%.zip}"
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_bs=1024
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printf "Extracting ROOT-A partition\n"
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ROOTP=$( printf "unit\nB\nprint\nquit\n" | \
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parted "${FILE}" 2>/dev/null | grep "${NAME}" )
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START=$(( $( echo ${ROOTP} | cut -f2 -d\ | tr -d "B" ) ))
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SIZE=$(( $( echo ${ROOTP} | cut -f4 -d\ | tr -d "B" ) ))
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dd if="${FILE}" of="${ROOTFS}" bs=${_bs} \
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skip=$(( ${START} / ${_bs} )) count=$(( ${SIZE} / ${_bs} )) || \
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err "extract_partition, dd ${FILE}, ${ROOTFS}"
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}
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extract_shellball()
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{
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printf "Extracting chromeos-firmwareupdate\n"
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printf "cd /usr/sbin\ndump chromeos-firmwareupdate ${SHELLBALL}\nquit" \
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| debugfs "${ROOTFS}" || err "extract_shellball: debugfs"
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}
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extract_coreboot()
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{
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_unpacked=$( mktemp -d )
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printf "Extracting coreboot image\n"
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[ -f "${SHELLBALL}" ] || \
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err "extract_coreboot: shellball missing in google cros image"
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sh "${SHELLBALL}" --unpack "${_unpacked}" || err "shellball, ${SHELLBALL}"
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# TODO: audit the f* out of that shellball, for each mrc version.
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# it has to be updated for each mrc update. we should ideally
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# implement the functionality ourselves.
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[ -f "${_unpacked}/VERSION" ] || \
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err "extract_coreboot: VERSION file missing on google coreboot rom"
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_version=$( cat "${_unpacked}/VERSION" | grep BIOS\ version: | \
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cut -f2 -d: | tr -d \ )
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cp "${_unpacked}/bios.bin" "coreboot-${_version}.bin" || \
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err "!cp unpacked, ${_unpacked}/bios.bin, coreboot-${_version}.rom"
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}
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