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#!/bin/bash
# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Script to generate a Chromium OS update for use by the update engine.
# If a source .bin is specified, the update is assumed to be a delta update.
# --- BEGIN COMMON.SH BOILERPLATE ---
# Load common CrOS utilities. Inside the chroot this file is installed in
# /usr/lib/crosutils. Outside the chroot we find it relative to the script's
# location.
find_common_sh() {
local thisdir="$(dirname "$(readlink -f "$0")")"
local common_paths=(/usr/lib/crosutils "${thisdir}")
local path
SCRIPT_ROOT=
for path in "${common_paths[@]}"; do
if [ -r "${path}/common.sh" ]; then
SCRIPT_ROOT=${path}
break
fi
done
# HACK(zbehan): We have to fake GCLIENT_ROOT in case we're running inside
# au_zip enviroment. GCLIENT_ROOT detection became fatal...
[ "${SCRIPT_ROOT}" == "${thisdir}" ] && \
export GCLIENT_ROOT="."
}
find_common_sh
. "${SCRIPT_ROOT}/common.sh" || (echo "Unable to load common.sh" && exit 1)
# --- END COMMON.SH BOILERPLATE ---
# Load functions and constants for chromeos-install
# NOTE: Needs to be called from outside the chroot.
. "/usr/lib/installer/chromeos-common.sh" &> /dev/null || \
. "${SRC_ROOT}/platform/installer/chromeos-common.sh" &> /dev/null || \
. "./chromeos-common.sh" || \
die "Unable to load /usr/lib/installer/chromeos-common.sh"
SRC_MNT=""
DST_MNT=""
SRC_KERNEL=""
SRC_ROOT=""
DST_KERNEL=""
DST_ROOT=""
STATE_MNT=""
STATE_LOOP_DEV=""
# Pass an arg to not exit 1 at the end
cleanup() {
set +e
if [ -n "$SRC_MNT" ]; then
sudo umount -d "$SRC_MNT"
[ -d "$SRC_MNT" ] && rmdir "$SRC_MNT"
SRC_MNT=""
fi
if [ -n "$DST_MNT" ]; then
sudo umount -d "$DST_MNT"
[ -d "$DST_MNT" ] && rmdir "$DST_MNT"
DST_MNT=""
fi
if [ -n "$STATE_MNT" ]; then
sudo umount "$STATE_MNT"
[ -d "$STATE_MNT" ] && rmdir "$STATE_MNT"
STATE_MNT=""
fi
if [ -n "$STATE_LOOP_DEV" ]; then
sudo losetup -d "$STATE_LOOP_DEV"
STATE_LOOP_DEV=""
fi
rm -f "$SRC_KERNEL"
rm -f "$SRC_ROOT"
rm -f "$DST_KERNEL"
rm -f "$DST_ROOT"
[ -n "$1" ] || exit 1
}
extract_partition_to_temp_file() {
local filename="$1"
local partition="$2"
local temp_file="$3"
if [ -z "$temp_file" ]; then
temp_file=$(mktemp /tmp/cros_generate_update_payload.XXXXXX)
echo "$temp_file"
fi
local offset=$(partoffset "${filename}" ${partition}) # 512-byte sectors
local length=$(partsize "${filename}" ${partition}) # 512-byte sectors
local bs=512
local sectors_per_two_mib=$((2 * 1024 * 1024 / 512))
if [ $(( $offset % $sectors_per_two_mib )) -eq 0 -a \
$(( $length % $sectors_per_two_mib )) -eq 0 ]; then
bs=$((2 * 1024 * 1024))
offset=$(($offset / $sectors_per_two_mib))
length=$(($length / $sectors_per_two_mib))
else
warn "partition offset or length not at 2MiB boundary"
fi
dd if="$filename" of="$temp_file" bs=$bs count="$length" \
skip="$offset" 2>/dev/null
}
patch_kernel() {
local IMAGE="$1"
local KERN_FILE="$2"
echo "Patching kernel" $KERN_FILE
echo " into" $IMAGE
STATE_LOOP_DEV=$(sudo losetup -f)
[ -n "$STATE_LOOP_DEV" ] || die "no free loop device"
local offset=$(partoffset "${IMAGE}" 1)
offset=$(($offset * 512))
sudo losetup -o "$offset" "$STATE_LOOP_DEV" "$IMAGE"
STATE_MNT=$(mktemp -d /tmp/state.XXXXXX)
sudo mount --read-only "$STATE_LOOP_DEV" "$STATE_MNT"
dd if="$STATE_MNT"/vmlinuz_hd.vblock of="$KERN_FILE" conv=notrunc 2>/dev/null
sudo umount "$STATE_MNT"
STATE_MNT=""
sudo losetup -d "$STATE_LOOP_DEV"
STATE_LOOP_DEV=""
}
extract_kern_root() {
local bin_file="$1"
local kern_out="$2"
local root_out="$3"
if [ -z "$kern_out" ]; then
die "missing kernel output filename"
fi
if [ -z "$root_out" ]; then
die "missing root output filename"
fi
extract_partition_to_temp_file "$bin_file" 2 "$kern_out"
if [ "$FLAGS_patch_kernel" -eq "$FLAGS_TRUE" ]; then
patch_kernel "$bin_file" "$kern_out"
fi
extract_partition_to_temp_file "$bin_file" 3 "$root_out"
}
DEFINE_string image "" "The image that should be sent to clients."
DEFINE_string src_image "" "Optional: a source image. If specified, this makes\
a delta update."
DEFINE_boolean old_style "$FLAGS_FALSE" "Generate an old-style .gz full update."
DEFINE_string output "" "Output file"
DEFINE_boolean outside_chroot "$FLAGS_FALSE" "Running outside of chroot."
DEFINE_boolean patch_kernel "$FLAGS_FALSE" "Whether or not to patch the kernel \
with the patch from the stateful partition (default: false)"
DEFINE_string private_key "" "Path to private key in .pem format."
DEFINE_boolean extract "$FLAGS_FALSE" "If set, extract old/new kernel/rootfs \
to [old|new]_[kern|root].dat. Useful for debugging (default: false)"
DEFINE_boolean full_kernel "$FLAGS_FALSE" "Generate a full kernel update even \
if generating a delta update (default: false)"
# Parse command line
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"
set -e
if [ -n "$FLAGS_src_image" ] && \
[ "$FLAGS_outside_chroot" -eq "$FLAGS_FALSE" ]; then
# We need to be in the chroot for generating delta images.
# by specifying --outside_chroot you can choose not to assert
# this will allow us to run this script outside chroot.
# Running this script outside chroot requires copying delta_generator binary
# and also copying few shared libraries with it.
assert_inside_chroot
fi
locate_gpt
if [ "$FLAGS_extract" -eq "$FLAGS_TRUE" ]; then
if [ -n "$FLAGS_src_image" ]; then
extract_kern_root "$FLAGS_src_image" old_kern.dat old_root.dat
fi
if [ -n "$FLAGS_image" ]; then
extract_kern_root "$FLAGS_image" new_kern.dat new_root.dat
fi
echo Done extracting kernel/root
exit 0
fi
DELTA=$FLAGS_TRUE
[ -n "$FLAGS_output" ] || die \
"Error: you must specify an output filename with --output FILENAME"
if [ -z "$FLAGS_src_image" ]; then
DELTA=$FLAGS_FALSE
fi
if [ "$DELTA" -eq "$FLAGS_TRUE" -o "$FLAGS_old_style" -eq "$FLAGS_FALSE" ]; then
echo "Generating a delta update"
# Sanity check that the real generator exists:
GENERATOR="$(which delta_generator)"
[ -x "$GENERATOR" ] || die "can't find delta_generator"
trap cleanup INT TERM EXIT
if [ "$DELTA" -eq "$FLAGS_TRUE" ]; then
if [ "$FLAGS_full_kernel" -eq "$FLAGS_FALSE" ]; then
SRC_KERNEL=$(extract_partition_to_temp_file "$FLAGS_src_image" 2)
if [ "$FLAGS_patch_kernel" -eq "$FLAGS_TRUE" ]; then
patch_kernel "$FLAGS_src_image" "$SRC_KERNEL"
fi
echo md5sum of src kernel:
md5sum "$SRC_KERNEL"
else
echo "Generating a full kernel update."
fi
SRC_ROOT=$(extract_partition_to_temp_file "$FLAGS_src_image" 3)
echo md5sum of src root:
md5sum "$SRC_ROOT"
fi
DST_KERNEL=$(extract_partition_to_temp_file "$FLAGS_image" 2)
if [ "$FLAGS_patch_kernel" -eq "$FLAGS_TRUE" ]; then
patch_kernel "$FLAGS_image" "$DST_KERNEL"
fi
DST_ROOT=$(extract_partition_to_temp_file "$FLAGS_image" 3)
if [ "$DELTA" -eq "$FLAGS_TRUE" ]; then
SRC_MNT=$(mktemp -d /tmp/src_root.XXXXXX)
sudo mount -o loop,ro "$SRC_ROOT" "$SRC_MNT"
DST_MNT=$(mktemp -d /tmp/src_root.XXXXXX)
sudo mount -o loop,ro "$DST_ROOT" "$DST_MNT"
sudo LD_LIBRARY_PATH=${LD_LIBRARY_PATH} PATH=${PATH} "$GENERATOR" \
-new_dir "$DST_MNT" -new_image "$DST_ROOT" -new_kernel "$DST_KERNEL" \
-old_dir "$SRC_MNT" -old_image "$SRC_ROOT" -old_kernel "$SRC_KERNEL" \
-out_file "$FLAGS_output" -private_key "$FLAGS_private_key"
else
"$GENERATOR" \
-new_image "$DST_ROOT" -new_kernel "$DST_KERNEL" \
-out_file "$FLAGS_output" -private_key "$FLAGS_private_key"
fi
trap - INT TERM EXIT
cleanup noexit
if [ "$DELTA" -eq "$FLAGS_TRUE" ]; then
echo "Done generating delta."
else
echo "Done generating new style full update."
fi
else
echo "Generating old-style full update"
trap cleanup INT TERM EXIT
DST_KERNEL=$(extract_partition_to_temp_file "$FLAGS_image" 2)
if [ "$FLAGS_patch_kernel" -eq "$FLAGS_TRUE" ]; then
patch_kernel "$FLAGS_image" "$DST_KERNEL"
fi
DST_ROOT=$(extract_partition_to_temp_file "$FLAGS_image" 3)
GENERATOR="${SCRIPTS_DIR}/mk_memento_images.sh"
CROS_GENERATE_UPDATE_PAYLOAD_CALLED=1 "$GENERATOR" "$DST_KERNEL" "$DST_ROOT"
mv "$(dirname "$DST_KERNEL")/update.gz" "$FLAGS_output"
trap - INT TERM EXIT
cleanup noexit
echo "Done generating full update."
fi