util: Add scripts to download and extract blobs

This turned out really handy when I tried to build coreboot
for my Chromebox.

These scripts can be used to extract System Agent reference code
and other blobs (e.g. mrc.bin, refcode, VGA option roms) from a
Chrome OS recovery image.

crosfirmware.sh downloads a Chrome OS recovery image from the recovery
image server, unpacks it, extracts the firmware update shell archive,
extracts the firmware images from the shell archive.

To download all Chrome OS firmware images, run
$ ./crosfirmware.sh

To download, e.g. the Panther firmware image, run
$ ./crosfirmware.sh panther

extract_blobs.sh extracts the blobs from a Chrome OS firmware image.

Right now it will produce the ME firmware blob, IFD, VGA option rom,
and mrc.bin

Change-Id: I5fb7e14b10e03e18cd360bc35f1dc92e8ed34e63
Signed-off-by: Joe Pillow <joseph.a.pillow@gmail.com>
Reviewed-on: https://review.coreboot.org/13752
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 140 insertions, 0 deletions

diff --git a/util/chromeos/crosfirmware.sh b/util/chromeos/crosfirmware.sh
new file mode 100644
index 0000000000..a4cb487c2c
--- /dev/null
+++ b/util/chromeos/crosfirmware.sh
@@ -0,0 +1,140 @@
+#!/bin/bash -x
+#
+# This file is part of the coreboot project.
+#
+# Copyright (C) 2016 Joe Pillow
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+# This script needs
+# * sharutils
+
+#DEBUG=1
+
+debug()
+{
+	test "$DEBUG" == "1" && echo "$*"
+}
+
+get_inventory()
+{
+	_conf=$1
+	_url=https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf
+
+	debug "Downloading recovery image inventory..."
+
+	curl -s "$_url" > $_conf
+}
+
+download_image()
+{
+	_url=$1
+	_file=$2
+
+	debug "Downloading recovery image"
+	curl -s "$_url" > "$_file.zip"
+	debug "Decompressing recovery image"
+	unzip -q "$_file.zip"
+	rm "$_file.zip"
+}
+
+extract_partition()
+{
+	NAME=$1
+	FILE=$2
+	ROOTFS=$3
+	_bs=1024
+
+	debug "Extracting ROOT-A partition"
+	ROOTP=$( printf "unit\nB\nprint\nquit\n" | parted $FILE | 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 2>&1
+}
+
+extract_shellball()
+{
+	ROOTFS=$1
+	SHELLBALL=$2
+
+	debug "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 )
+
+	debug "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=$1
+
+if [ "$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