summaryrefslogtreecommitdiff
path: root/util/chromeos/crosfirmware.sh
blob: dc33fac8cef883e52a943d6f52dea64bd54cb127 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
#!/usr/bin/env bash
#
# 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.
#

# 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"
}

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