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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/hardware_android.h"
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <algorithm>
#include <memory>
#include <bootloader.h>
#include <base/files/file_util.h>
#include <base/strings/stringprintf.h>
#include <cutils/properties.h>
#include "update_engine/common/hardware.h"
#include "update_engine/common/platform_constants.h"
#include "update_engine/common/utils.h"
#include "update_engine/utils_android.h"
using std::string;
namespace chromeos_update_engine {
namespace {
// The powerwash arguments passed to recovery. Arguments are separated by \n.
const char kAndroidRecoveryPowerwashCommand[] =
// Android properties that identify the hardware and potentially non-updatable
// parts of the bootloader (such as the bootloader version and the baseband
// version).
const char kPropBootBootloader[] = "ro.boot.bootloader";
const char kPropBootBaseband[] = "ro.boot.baseband";
const char kPropProductManufacturer[] = "ro.product.manufacturer";
const char kPropBootHardwareSKU[] = "ro.boot.hardware.sku";
const char kPropBootRevision[] = "ro.boot.revision";
// Write a recovery command line |message| to the BCB. The arguments to recovery
// must be separated by '\n'. An empty string will erase the BCB.
bool WriteBootloaderRecoveryMessage(const string& message) {
base::FilePath misc_device;
if (!utils::DeviceForMountPoint("/misc", &misc_device))
return false;
// Setup a bootloader_message with just the command and recovery fields set.
bootloader_message boot = {};
if (!message.empty()) {
strncpy(boot.command, "boot-recovery", sizeof(boot.command) - 1);
std::min(message.size(), sizeof(boot.recovery) - 1));
int fd =
HANDLE_EINTR(open(misc_device.value().c_str(), O_WRONLY | O_SYNC, 0600));
if (fd < 0) {
PLOG(ERROR) << "Opening misc";
return false;
ScopedFdCloser fd_closer(&fd);
// We only re-write the first part of the bootloader_message, up to and
// including the recovery message.
size_t boot_size =
offsetof(bootloader_message, recovery) + sizeof(boot.recovery);
if (!utils::WriteAll(fd, &boot, boot_size)) {
PLOG(ERROR) << "Writing recovery command to misc";
return false;
return true;
} // namespace
namespace hardware {
// Factory defined in hardware.h.
std::unique_ptr<HardwareInterface> CreateHardware() {
return std::make_unique<HardwareAndroid>();
} // namespace hardware
// In Android there are normally three kinds of builds: eng, userdebug and user.
// These builds target respectively a developer build, a debuggable version of
// the final product and the pristine final product the end user will run.
// Apart from the property name, they differ in the following
// properties that characterize the builds:
// * eng builds: and ro.debuggable=1
// * userdebug builds: and ro.debuggable=1
// * user builds: and ro.debuggable=0
// See IsOfficialBuild() and IsNormalMode() for the meaning of these options in
// Android.
bool HardwareAndroid::IsOfficialBuild() const {
// We run an official build iff == 1, because we expect the build to
// behave like the end user product and check for updates. Note that while
// developers are able to build "official builds" by just running "make user",
// that will only result in a more restrictive environment. The important part
// is that we don't produce and push "non-official" builds to the end user.
// In case of a non-bool value, we take the most restrictive option and
// assume we are in an official-build.
return property_get_bool("", 1) != 0;
bool HardwareAndroid::IsNormalBootMode() const {
// We are running in "dev-mode" iff ro.debuggable == 1. In dev-mode the
// update_engine will allow extra developers options, such as providing a
// different update URL. In case of error, we assume the build is in
// normal-mode.
return property_get_bool("ro.debuggable", 0) != 1;
bool HardwareAndroid::AreDevFeaturesEnabled() const {
return !IsNormalBootMode();
bool HardwareAndroid::IsOOBEEnabled() const {
// No OOBE flow blocking updates for Android-based boards.
return false;
bool HardwareAndroid::IsOOBEComplete(base::Time* out_time_of_oobe) const {
LOG(WARNING) << "OOBE is not enabled but IsOOBEComplete() called.";
if (out_time_of_oobe)
*out_time_of_oobe = base::Time();
return true;
string HardwareAndroid::GetHardwareClass() const {
char manufacturer[PROPERTY_VALUE_MAX];
char revision[PROPERTY_VALUE_MAX];
property_get(kPropBootHardwareSKU, sku, "");
property_get(kPropProductManufacturer, manufacturer, "");
property_get(kPropBootRevision, revision, "");
return base::StringPrintf("%s:%s:%s", manufacturer, sku, revision);
string HardwareAndroid::GetFirmwareVersion() const {
char bootloader[PROPERTY_VALUE_MAX];
property_get(kPropBootBootloader, bootloader, "");
return bootloader;
string HardwareAndroid::GetECVersion() const {
char baseband[PROPERTY_VALUE_MAX];
property_get(kPropBootBaseband, baseband, "");
return baseband;
int HardwareAndroid::GetPowerwashCount() const {
LOG(WARNING) << "STUB: Assuming no factory reset was performed.";
return 0;
bool HardwareAndroid::SchedulePowerwash() {
LOG(INFO) << "Scheduling a powerwash to BCB.";
return WriteBootloaderRecoveryMessage(kAndroidRecoveryPowerwashCommand);
bool HardwareAndroid::CancelPowerwash() {
return WriteBootloaderRecoveryMessage("");
bool HardwareAndroid::GetNonVolatileDirectory(base::FilePath* path) const {
base::FilePath local_path(constants::kNonVolatileDirectory);
if (!base::PathExists(local_path)) {
LOG(ERROR) << "Non-volatile directory not found: " << local_path.value();
return false;
*path = local_path;
return true;
bool HardwareAndroid::GetPowerwashSafeDirectory(base::FilePath* path) const {
// On Android, we don't have a directory persisted across powerwash.
return false;
bool HardwareAndroid::GetFirstActiveOmahaPingSent() const {
LOG(WARNING) << "STUB: Assuming first active omaha was never set.";
return false;
void HardwareChromeOS::SetFirstActiveOmahaPingSent() {
LOG(WARNING) << "STUB: Assuming first active omaha is never set.";
} // namespace chromeos_update_engine