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// Copyright (C) 2015 The Android Open Source Project
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "update_engine/image_properties.h"
#include <string>
#include <vector>
#include <base/files/file_util.h>
#include <base/logging.h>
#include <brillo/key_value_store.h>
#include "update_engine/common/constants.h"
#include "update_engine/common/hardware_interface.h"
#include "update_engine/common/platform_constants.h"
#include "update_engine/common/utils.h"
#include "update_engine/system_state.h"
namespace {
const char kLsbRelease[] = "/etc/lsb-release";
const char kLsbReleaseAppIdKey[] = "CHROMEOS_RELEASE_APPID";
const char kLsbReleaseAutoUpdateServerKey[] = "CHROMEOS_AUSERVER";
const char kLsbReleaseBoardAppIdKey[] = "CHROMEOS_BOARD_APPID";
const char kLsbReleaseBoardKey[] = "CHROMEOS_RELEASE_BOARD";
const char kLsbReleaseCanaryAppIdKey[] = "CHROMEOS_CANARY_APPID";
const char kLsbReleaseIsPowerwashAllowedKey[] = "CHROMEOS_IS_POWERWASH_ALLOWED";
const char kLsbReleaseUpdateChannelKey[] = "CHROMEOS_RELEASE_TRACK";
const char kLsbReleaseVersionKey[] = "CHROMEOS_RELEASE_VERSION";
const char kDefaultAppId[] = "{87efface-864d-49a5-9bb3-4b050a7c227a}";
// A prefix added to the path, used for testing.
const char* root_prefix = nullptr;
std::string GetStringWithDefault(const brillo::KeyValueStore& store,
const std::string& key,
const std::string& default_value) {
std::string result;
if (store.GetString(key, &result))
return result;
LOG(INFO) << "Cannot load ImageProperty " << key << ", using default value "
<< default_value;
return default_value;
enum class LsbReleaseSource {
// Loads the lsb-release properties into the key-value |store| reading the file
// from either the system image or the stateful partition as specified by
// |source|. The loaded values are added to the store, possibly overriding
// existing values.
void LoadLsbRelease(LsbReleaseSource source, brillo::KeyValueStore* store) {
std::string path;
if (root_prefix)
path = root_prefix;
if (source == LsbReleaseSource::kStateful)
path += chromeos_update_engine::kStatefulPartition;
store->Load(base::FilePath(path + kLsbRelease));
} // namespace
namespace chromeos_update_engine {
namespace test {
void SetImagePropertiesRootPrefix(const char* test_root_prefix) {
root_prefix = test_root_prefix;
} // namespace test
ImageProperties LoadImageProperties(SystemState* system_state) {
ImageProperties result;
brillo::KeyValueStore lsb_release;
LoadLsbRelease(LsbReleaseSource::kSystem, &lsb_release);
result.current_channel = GetStringWithDefault(
lsb_release, kLsbReleaseUpdateChannelKey, "stable-channel");
// In dev-mode and unofficial build we can override the image properties set
// in the system image with the ones from the stateful partition, except the
// channel of the current image.
HardwareInterface* const hardware = system_state->hardware();
if (!hardware->IsOfficialBuild() || !hardware->IsNormalBootMode())
LoadLsbRelease(LsbReleaseSource::kStateful, &lsb_release);
// The release_app_id is used as the default appid, but can be override by
// the board appid in the general case or the canary appid for the canary
// channel only.
std::string release_app_id =
GetStringWithDefault(lsb_release, kLsbReleaseAppIdKey, kDefaultAppId);
result.product_id = GetStringWithDefault(
lsb_release, kLsbReleaseBoardAppIdKey, release_app_id);
result.canary_product_id = GetStringWithDefault(
lsb_release, kLsbReleaseCanaryAppIdKey, release_app_id);
result.board = GetStringWithDefault(lsb_release, kLsbReleaseBoardKey, "");
result.version = GetStringWithDefault(lsb_release, kLsbReleaseVersionKey, "");
result.omaha_url =
// Build fingerprint not used in Chrome OS.
result.build_fingerprint = "";
result.allow_arbitrary_channels = false;
return result;
MutableImageProperties LoadMutableImageProperties(SystemState* system_state) {
MutableImageProperties result;
brillo::KeyValueStore lsb_release;
LoadLsbRelease(LsbReleaseSource::kSystem, &lsb_release);
LoadLsbRelease(LsbReleaseSource::kStateful, &lsb_release);
result.target_channel = GetStringWithDefault(
lsb_release, kLsbReleaseUpdateChannelKey, "stable-channel");
if (!lsb_release.GetBoolean(kLsbReleaseIsPowerwashAllowedKey,
result.is_powerwash_allowed = false;
return result;
bool StoreMutableImageProperties(SystemState* system_state,
const MutableImageProperties& properties) {
brillo::KeyValueStore lsb_release;
LoadLsbRelease(LsbReleaseSource::kStateful, &lsb_release);
lsb_release.SetString(kLsbReleaseUpdateChannelKey, properties.target_channel);
std::string root_prefix_str = root_prefix ? root_prefix : "";
base::FilePath path(root_prefix_str + kStatefulPartition + kLsbRelease);
if (!base::DirectoryExists(path.DirName()))
return lsb_release.Save(path);
void LogImageProperties() {
std::string lsb_release;
if (utils::ReadFile(kLsbRelease, &lsb_release)) {
LOG(INFO) << "lsb-release inside the old rootfs:\n" << lsb_release;
std::string stateful_lsb_release;
if (utils::ReadFile(std::string(kStatefulPartition) + kLsbRelease,
&stateful_lsb_release)) {
LOG(INFO) << "stateful lsb-release:\n" << stateful_lsb_release;
} // namespace chromeos_update_engine