blob: 653ccf907b6f6b28793ee1004615f001c23ed621 [file] [log] [blame]
//
// 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// 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 <bootloader.h>
#include <base/files/file_util.h>
#include <brillo/make_unique_ptr.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[] =
"recovery\n"
"--wipe_data\n"
"--reason=wipe_data_from_ota\n";
// 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);
memcpy(boot.recovery,
message.data(),
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 brillo::make_unique_ptr(new 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 ro.build.type property name, they differ in the following
// properties that characterize the builds:
// * eng builds: ro.secure=0 and ro.debuggable=1
// * userdebug builds: ro.secure=1 and ro.debuggable=1
// * user builds: ro.secure=1 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 ro.secure == 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("ro.secure", 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 {
LOG(WARNING) << "STUB: GetHardwareClass().";
return "ANDROID";
}
string HardwareAndroid::GetFirmwareVersion() const {
LOG(WARNING) << "STUB: GetFirmwareVersion().";
return "0";
}
string HardwareAndroid::GetECVersion() const {
LOG(WARNING) << "STUB: GetECVersion().";
return "0";
}
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;
}
} // namespace chromeos_update_engine