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#!/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 $NAME)
if [ "$ROOTP" == "" ]; then
# Automatic extraction failed, likely due to parted detecting
# overlapping partitions. Fall back to using fdisk and assume
# ROOT-A is partition #3
echo "(Extracting via parted failed; falling back to fdisk)"
_ssize=$(printf "p q" | fdisk $FILE | grep "Sector size" |
cut -f2 -d: | cut -f2 -d ' ')
_start=$(printf "p q" | fdisk $FILE | grep "bin3" | tr -s ' ' |
cut -f2 -d ' ')
_nsec=$(printf "p q" | fdisk $FILE | grep "bin3" | tr -s ' ' |
cut -f4 -d ' ')
START=$(($_ssize * $_start))
SIZE=$(($_ssize * $_nsec))
else
START=$(($(echo $ROOTP | cut -f2 -d\ | tr -d "B")))
SIZE=$(($(echo $ROOTP | cut -f4 -d\ | tr -d "B")))
fi
dd if=$FILE of=$ROOTFS bs=$_bs skip=$(($START / $_bs)) \
count=$(($SIZE / $_bs)) >/dev/null 2>&1
}
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"
if ! sh $_shellball --unpack $_unpacked >/dev/null 2>&1; then
sh $_shellball --sb_extract $_unpacked >/dev/null 2>&1
fi
if [ -d $_unpacked/models/ ]; then
_version=$(cat $_unpacked/VERSION | grep -m 1 -e Model.*$_board -A5 |
grep "BIOS (RW) version:" | cut -f2 -d: | tr -d \ )
if [ "$_version" == "" ]; then
_version=$(cat $_unpacked/VERSION | grep -m 1 -e Model.*$_board -A5 |
grep "BIOS version:" | cut -f2 -d: | tr -d \ )
fi
_bios_image=$(grep "IMAGE_MAIN" $_unpacked/models/$_board/setvars.sh |
cut -f2 -d\")
else
_version=$(cat $_unpacked/VERSION | grep BIOS\ version: |
cut -f2 -d: | tr -d \ )
_bios_image=bios.bin
fi
if cp $_unpacked/$_bios_image coreboot-$_version.bin; then
echo "Extracted coreboot-$_version.bin"
fi
rm -rf "$_unpacked"
rm $_shellball
}
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 -i $BOARD -A8 $CONF | grep '\(url=\|file=\)')
do_one_board $BOARD $url $file
rm "$CONF"
else
echo "Usage: $0 <boardname>"
echo " $0 all"
echo
exit 1
fi
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