//
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// Copyright (C) 2015 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "update_engine/hardware_android.h"
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#include <sys/types.h>
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#include <memory>
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#include <android-base/properties.h>
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#include <base/files/file_util.h>
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#include <bootloader_message/bootloader_message.h>
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#include "update_engine/common/hardware.h"
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#include "update_engine/common/platform_constants.h"
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using android::base::GetBoolProperty;
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using android::base::GetIntProperty;
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using android::base::GetProperty;
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using std::string;
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namespace chromeos_update_engine {
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namespace {
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// Android properties that identify the hardware and potentially non-updatable
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// parts of the bootloader (such as the bootloader version and the baseband
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// version).
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const char kPropBootBootloader[] = "ro.boot.bootloader";
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const char kPropBootBaseband[] = "ro.boot.baseband";
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const char kPropProductManufacturer[] = "ro.product.manufacturer";
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const char kPropBootHardwareSKU[] = "ro.boot.hardware.sku";
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const char kPropBootRevision[] = "ro.boot.revision";
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const char kPropBuildDateUTC[] = "ro.build.date.utc";
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} // namespace
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namespace hardware {
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// Factory defined in hardware.h.
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std::unique_ptr<HardwareInterface> CreateHardware() {
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return std::make_unique<HardwareAndroid>();
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}
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} // namespace hardware
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// In Android there are normally three kinds of builds: eng, userdebug and user.
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// These builds target respectively a developer build, a debuggable version of
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// the final product and the pristine final product the end user will run.
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// Apart from the ro.build.type property name, they differ in the following
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// properties that characterize the builds:
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// * eng builds: ro.secure=0 and ro.debuggable=1
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// * userdebug builds: ro.secure=1 and ro.debuggable=1
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// * user builds: ro.secure=1 and ro.debuggable=0
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//
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// See IsOfficialBuild() and IsNormalMode() for the meaning of these options in
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// Android.
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bool HardwareAndroid::IsOfficialBuild() const {
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// We run an official build iff ro.secure == 1, because we expect the build to
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// behave like the end user product and check for updates. Note that while
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// developers are able to build "official builds" by just running "make user",
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// that will only result in a more restrictive environment. The important part
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// is that we don't produce and push "non-official" builds to the end user.
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//
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// In case of a non-bool value, we take the most restrictive option and
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// assume we are in an official-build.
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return GetBoolProperty("ro.secure", true);
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}
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bool HardwareAndroid::IsNormalBootMode() const {
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// We are running in "dev-mode" iff ro.debuggable == 1. In dev-mode the
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// update_engine will allow extra developers options, such as providing a
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// different update URL. In case of error, we assume the build is in
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// normal-mode.
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return !GetBoolProperty("ro.debuggable", false);
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}
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bool HardwareAndroid::AreDevFeaturesEnabled() const {
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return !IsNormalBootMode();
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}
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bool HardwareAndroid::IsOOBEEnabled() const {
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// No OOBE flow blocking updates for Android-based boards.
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return false;
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}
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bool HardwareAndroid::IsOOBEComplete(base::Time* out_time_of_oobe) const {
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LOG(WARNING) << "OOBE is not enabled but IsOOBEComplete() called.";
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if (out_time_of_oobe)
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*out_time_of_oobe = base::Time();
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return true;
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}
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string HardwareAndroid::GetHardwareClass() const {
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auto manufacturer = GetProperty(kPropProductManufacturer, "");
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auto sku = GetProperty(kPropBootHardwareSKU, "");
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auto revision = GetProperty(kPropBootRevision, "");
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return manufacturer + ":" + sku + ":" + revision;
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}
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string HardwareAndroid::GetFirmwareVersion() const {
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return GetProperty(kPropBootBootloader, "");
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}
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string HardwareAndroid::GetECVersion() const {
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return GetProperty(kPropBootBaseband, "");
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}
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int HardwareAndroid::GetMinKernelKeyVersion() const {
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LOG(WARNING) << "STUB: No Kernel key version is available.";
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return -1;
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}
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int HardwareAndroid::GetMinFirmwareKeyVersion() const {
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LOG(WARNING) << "STUB: No Firmware key version is available.";
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return -1;
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}
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int HardwareAndroid::GetMaxFirmwareKeyRollforward() const {
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LOG(WARNING) << "STUB: Getting firmware_max_rollforward is not supported.";
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return -1;
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}
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bool HardwareAndroid::SetMaxFirmwareKeyRollforward(
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int firmware_max_rollforward) {
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LOG(WARNING) << "STUB: Setting firmware_max_rollforward is not supported.";
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return false;
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}
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bool HardwareAndroid::SetMaxKernelKeyRollforward(int kernel_max_rollforward) {
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LOG(WARNING) << "STUB: Setting kernel_max_rollforward is not supported.";
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return false;
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}
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int HardwareAndroid::GetPowerwashCount() const {
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LOG(WARNING) << "STUB: Assuming no factory reset was performed.";
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return 0;
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}
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bool HardwareAndroid::SchedulePowerwash(bool is_rollback) {
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LOG(INFO) << "Scheduling a powerwash to BCB.";
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LOG_IF(WARNING, is_rollback) << "is_rollback was true but isn't supported.";
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string err;
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if (!update_bootloader_message({"--wipe_data", "--reason=wipe_data_from_ota"},
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&err)) {
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LOG(ERROR) << "Failed to update bootloader message: " << err;
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return false;
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}
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return true;
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}
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bool HardwareAndroid::CancelPowerwash() {
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string err;
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if (!clear_bootloader_message(&err)) {
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LOG(ERROR) << "Failed to clear bootloader message: " << err;
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return false;
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}
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return true;
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}
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bool HardwareAndroid::GetNonVolatileDirectory(base::FilePath* path) const {
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base::FilePath local_path(constants::kNonVolatileDirectory);
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if (!base::PathExists(local_path)) {
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LOG(ERROR) << "Non-volatile directory not found: " << local_path.value();
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return false;
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}
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*path = local_path;
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return true;
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}
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bool HardwareAndroid::GetPowerwashSafeDirectory(base::FilePath* path) const {
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// On Android, we don't have a directory persisted across powerwash.
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return false;
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}
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int64_t HardwareAndroid::GetBuildTimestamp() const {
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return GetIntProperty<int64_t>(kPropBuildDateUTC, 0);
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}
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bool HardwareAndroid::GetFirstActiveOmahaPingSent() const {
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LOG(WARNING) << "STUB: Assuming first active omaha was never set.";
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return false;
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}
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bool HardwareAndroid::SetFirstActiveOmahaPingSent() {
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LOG(WARNING) << "STUB: Assuming first active omaha is set.";
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// We will set it true, so its failure doesn't cause escalation.
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return true;
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}
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} // namespace chromeos_update_engine
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