download/mrc: use cleaner coding style
top-down order for all logic, and shorter code lines, conforming to rfc 2646 (no more than 80 characters) the 80-character rule is violated for variables containing long strings, such as wayback machine urls (can't be helped) a few bugs were discovered, which will be fixed in follow-up revisions, such as: * exit status not handled inside subshell * in general, exit status should be handled more explicitly, rather than relying on -efsdg20230625
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@ -15,18 +15,100 @@
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This script assumes that the working directory is the
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# root of osboot_src or osboot git.
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# This file is forked from util/chromeos/crosfirmware.sh in coreboot cfc26ce278
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# Changes to it in osboot are copyright 2021 Leah Rowe
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[ "x${DEBUG+set}" = 'xset' ] && set -v
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set -u -e
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# On some systems, `parted` and `debugfs` are located in /sbin.
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export PATH="${PATH}:/sbin"
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# This file is forked from util/chromeos/crosfirmware.sh in coreboot cfc26ce278
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# Changes to it in *this version* are copyright 2021 and 2023 Leah Rowe, under
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# the same license as above.
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# use updated manifest from wayback machine, when updating mrc.bin,
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# and update the other variables below accordingly. current manifest used:
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# https://web.archive.org/web/20210211071412/https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf
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# the wayback machine is used so that we get the same manifest. google
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# does not seem to version the manifest, but archives are available
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# variables taken from that manifest:
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_board="peppy"
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_file="chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin"
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_url="https://dl.google.com/dl/edgedl/chromeos/recovery/chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin.zip"
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_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"
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_sha1sum="cd5917cbe7f821ad769bf0fd87046898f9e175c8"
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_mrc_complete_hash="d18de1e3d52c0815b82ea406ca07897c56c65696"
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_mrc_complete="mrc/haswell/mrc.bin"
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cbdir="coreboot/default"
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cbfstool="${cbdir}/util/cbfstool/cbfstool"
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main()
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{
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printf "Downloading Intel MRC blobs\n"
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check_existing && exit 0
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build_dependencies
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fetch_mrc
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}
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check_existing()
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{
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if [ ! -f ${_mrc_complete} ]; then
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return 1
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fi
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printf 'found existing mrc.bin, checking its hash\n'
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if [ "$(sha1sum ${_mrc_complete} | awk '{print $1}')" \
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= "${_mrc_complete_hash}" ]; then
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printf 'checksums matched, skipping downloading\n'
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return 0
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else
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printf 'hashes did not match, starting over\n'
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return 1
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fi
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}
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build_dependencies()
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{
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if [ ! -d "${cbdir}/" ]; then
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./download coreboot default
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fi
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if [ ! -f "${cbfstool}" ]; then
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./build module cbutils default
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fi
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}
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fetch_mrc()
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{
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mkdir -p mrc/haswell/
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(
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cd mrc/haswell/
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download_image ${_url} ${_file} ${_sha1sum}
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if [ ! -f ${_file} ]; then
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download_image ${_url2} ${_file} ${_sha1sum}
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fi
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if [ ! -f $_file ]; then
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printf "%s not downloaded / verification failed. Exiting.\n" \
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${_file}
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exit 1
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fi
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extract_partition ROOT-A ${_file} root-a.ext2
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extract_shellball root-a.ext2 chromeos-firmwareupdate-${_board}
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extract_coreboot chromeos-firmwareupdate-${_board}
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../../${cbfstool} coreboot-*.bin extract -f mrc.bin \
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-n mrc.bin -r RO_SECTION
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rm -f "chromeos-firmwareupdate-${_board}" coreboot-*.bin \
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"${_file}" "root-a.ext2"
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printf "\n\nmrc.bin saved to ${_mrc_complete}\n\n"
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)
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}
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download_image()
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{
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_url=${1}
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@ -35,7 +117,8 @@ download_image()
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echo "Downloading recovery image"
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curl "$_url" > "$_file.zip"
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if [ "$(sha1sum ${_file}.zip | awk '{print $1}')" = "${_sha1sum}" ]; then
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if [ "$(sha1sum ${_file}.zip | awk '{print $1}')" = "${_sha1sum}" ]
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then
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unzip -q "${_file}.zip"
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rm "${_file}.zip"
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echo "Checksum verification passed for recovery image."
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@ -71,8 +154,8 @@ extract_shellball()
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SHELLBALL=${2}
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echo "Extracting chromeos-firmwareupdate"
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printf "cd /usr/sbin\ndump chromeos-firmwareupdate ${SHELLBALL}\nquit" | \
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debugfs ${ROOTFS} > /dev/null 2>&1
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printf "cd /usr/sbin\ndump chromeos-firmwareupdate ${SHELLBALL}\nquit" \
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| debugfs ${ROOTFS} > /dev/null 2>&1
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}
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extract_coreboot()
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@ -90,80 +173,4 @@ extract_coreboot()
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rm -r "${_unpacked}"
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}
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check_existing()
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{
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_mrc_complete_hash="d18de1e3d52c0815b82ea406ca07897c56c65696"
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if [ -f mrc/haswell/mrc.bin ]; then
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printf 'found existing mrc.bin, checking its hash\n'
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if [ "$(sha1sum mrc/haswell/mrc.bin | awk '{print $1}')" = "${_mrc_complete_hash}" ]; then
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printf 'checksums matched, skipping redownloading image\n'
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return 0
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else
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printf 'hashes did not match, starting over\n'
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return 1
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fi
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else
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return 1
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fi
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}
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# Skips redownloading every time the script runs
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check_existing && exit 0
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if [ ! -d "coreboot/default/" ]; then
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./download coreboot default
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fi
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if [ ! -f "coreboot/default/util/cbfstool/cbfstool" ]; then
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./build module cbutils default
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fi
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# Remove the old version that may still exist
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# ------------------------------------------------------------------------------
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printf "Downloading Intel MRC blobs\n"
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#rm -Rf "mrc/"
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mkdir -p mrc/haswell/
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(
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cd mrc/haswell/
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# https://web.archive.org/web/20210211071412/https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf
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# peppy image used as defined here, mrc.bin extracted from that.
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# when wanting to use an updated version later on, just change the url and
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# sha1sums and such, in this script, based on a newer version on archive.org.
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# For haswell mrc.bin, used on ThinkPad T440p and W541
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_board="peppy"
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_file="chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin"
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_url="https://dl.google.com/dl/edgedl/chromeos/recovery/chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin.zip"
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_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"
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_sha1sum="cd5917cbe7f821ad769bf0fd87046898f9e175c8"
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download_image ${_url} ${_file} ${_sha1sum}
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if [ ! -f ${_file} ]; then
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download_image ${_url2} ${_file} ${_sha1sum}
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fi
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if [ ! -f $_file ]; then
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echo "${_file} was not downloaded, or verification failed. Exiting"
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exit 1
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fi
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extract_partition ROOT-A ${_file} root-a.ext2
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extract_shellball root-a.ext2 chromeos-firmwareupdate-${_board}
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extract_coreboot chromeos-firmwareupdate-${_board}
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../../coreboot/default/util/cbfstool/cbfstool coreboot-*.bin extract -f mrc.bin -n mrc.bin -r RO_SECTION
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rm -f "chromeos-firmwareupdate-${_board}" coreboot-*.bin "${_file}" "root-a.ext2"
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printf "\n\nHaswell mrc.bin file (for T440p and W541) downloaded to mrc/haswell/mrc.bin\n\n"
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)
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exit 0
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main $@
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Reference in New Issue