#!/usr/bin/env bash # # SPDX-License-Identifier: GPL-2.0-only # On some systems, `parted` and `debugfs` are located in /sbin. export PATH="$PATH:/sbin" exit_if_uninstalled() { local cmd_name="$1" local deb_pkg_name="$2" if type "$cmd_name" >/dev/null 2>&1; then return fi printf '`%s` was not found. ' "$cmd_name" >&2 printf 'On Debian-based systems, it can be installed\n' >&2 printf 'by running `apt install %s`.\n' "$deb_pkg_name" >&2 exit 1 } exit_if_dependencies_are_missing() { exit_if_uninstalled "uudecode" "sharutils" exit_if_uninstalled "debugfs" "e2fsprogs" exit_if_uninstalled "parted" "parted" exit_if_uninstalled "curl" "curl" exit_if_uninstalled "unzip" "unzip" } get_inventory() { _conf=$1 _url=https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf echo "Downloading recovery image inventory..." curl -s "$_url" > $_conf } download_image() { _url=$1 _file=$2 echo "Downloading recovery image" curl "$_url" > "$_file.zip" echo "Decompressing recovery image" unzip -q "$_file.zip" rm "$_file.zip" } extract_partition() { NAME=$1 FILE=$2 ROOTFS=$3 _bs=1024 echo "Extracting ROOT-A partition" ROOTP=$( 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 )) > /dev/null } extract_shellball() { ROOTFS=$1 SHELLBALL=$2 echo "Extracting chromeos-firmwareupdate" printf "cd /usr/sbin\ndump chromeos-firmwareupdate $SHELLBALL\nquit" | \ debugfs $ROOTFS > /dev/null 2>&1 } extract_coreboot() { _shellball=$1 _unpacked=$( mktemp -d ) echo "Extracting coreboot image" sh $_shellball --sb_extract $_unpacked > /dev/null _version=$( cat $_unpacked/VERSION | grep BIOS\ version: | \ cut -f2 -d: | tr -d \ ) cp $_unpacked/bios.bin coreboot-$_version.bin rm -r "$_unpacked" } do_one_board() { _board=$1 _url=$2 _file=$3 download_image $_url $_file extract_partition ROOT-A $_file root-a.ext2 extract_shellball root-a.ext2 chromeos-firmwareupdate-$_board rm $_file root-a.ext2 extract_coreboot chromeos-firmwareupdate-$_board } # # Main # BOARD=$1 exit_if_dependencies_are_missing if [ "$BOARD" == "all" ]; then CONF=$( mktemp ) get_inventory $CONF grep ^name= $CONF| while read _line; do name=$( echo $_line | cut -f2 -d= ) echo Processing board $name eval $( grep -v hwid= $CONF | grep -A11 "$_line" | \ grep '\(url=\|file=\)' ) BOARD=$( echo $url | cut -f3 -d_ ) do_one_board $BOARD $url $file done rm "$CONF" elif [ "$BOARD" != "" ]; then CONF=$( mktemp ) get_inventory $CONF echo Processing board $BOARD eval $( grep $BOARD $CONF | grep '\(url=\|file=\)' ) do_one_board $BOARD $url $file rm "$CONF" else echo "Usage: $0 <boardname>" echo " $0 all" echo exit 1 fi