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//
// Copyright (C) 2013 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_chromeos.h"
#include <base/files/file_util.h>
#include <base/logging.h>
#include <base/strings/string_number_conversions.h>
#include <base/strings/string_util.h>
#include <brillo/make_unique_ptr.h>
#include <vboot/crossystem.h>
extern "C" {
#include "vboot/vboot_host.h"
}
#include "update_engine/hardware.h"
#include "update_engine/hwid_override.h"
#include "update_engine/subprocess.h"
#include "update_engine/utils.h"
using std::string;
using std::vector;
namespace {
const char kOOBECompletedMarker[] = "/home/chronos/.oobe_completed";
// The stateful directory used by update_engine to store powerwash-safe files.
// The files stored here must be whitelisted in the powerwash scripts.
const char kPowerwashSafeDirectory[] =
"/mnt/stateful_partition/unencrypted/preserve";
// The powerwash_count marker file contains the number of times the device was
// powerwashed. This value is incremented by the clobber-state script when
// a powerwash is performed.
const char kPowerwashCountMarker[] = "powerwash_count";
// The stateful directory used by update_engine. This directory is wiped during
// powerwash.
const char kNonVolatileDirectory[] = "/var/lib/update_engine";
} // namespace
namespace chromeos_update_engine {
namespace hardware {
// Factory defined in hardware.h.
std::unique_ptr<HardwareInterface> CreateHardware() {
return brillo::make_unique_ptr(new HardwareChromeOS());
}
} // namespace hardware
bool HardwareChromeOS::IsOfficialBuild() const {
return VbGetSystemPropertyInt("debug_build") == 0;
}
bool HardwareChromeOS::IsNormalBootMode() const {
bool dev_mode = VbGetSystemPropertyInt("devsw_boot") != 0;
return !dev_mode;
}
bool HardwareChromeOS::IsOOBEComplete(base::Time* out_time_of_oobe) const {
struct stat statbuf;
if (stat(kOOBECompletedMarker, &statbuf) != 0) {
if (errno != ENOENT) {
PLOG(ERROR) << "Error getting information about "
<< kOOBECompletedMarker;
}
return false;
}
if (out_time_of_oobe != nullptr)
*out_time_of_oobe = base::Time::FromTimeT(statbuf.st_mtime);
return true;
}
static string ReadValueFromCrosSystem(const string& key) {
char value_buffer[VB_MAX_STRING_PROPERTY];
const char* rv = VbGetSystemPropertyString(key.c_str(), value_buffer,
sizeof(value_buffer));
if (rv != nullptr) {
string return_value(value_buffer);
base::TrimWhitespaceASCII(return_value, base::TRIM_ALL, &return_value);
return return_value;
}
LOG(ERROR) << "Unable to read crossystem key " << key;
return "";
}
string HardwareChromeOS::GetHardwareClass() const {
if (USE_HWID_OVERRIDE) {
return HwidOverride::Read(base::FilePath("/"));
}
return ReadValueFromCrosSystem("hwid");
}
string HardwareChromeOS::GetFirmwareVersion() const {
return ReadValueFromCrosSystem("fwid");
}
string HardwareChromeOS::GetECVersion() const {
string input_line;
int exit_code = 0;
vector<string> cmd = {"/usr/sbin/mosys", "-k", "ec", "info"};
bool success = Subprocess::SynchronousExec(cmd, &exit_code, &input_line);
if (!success || exit_code) {
LOG(ERROR) << "Unable to read ec info from mosys (" << exit_code << ")";
return "";
}
return utils::ParseECVersion(input_line);
}
int HardwareChromeOS::GetPowerwashCount() const {
int powerwash_count;
base::FilePath marker_path = base::FilePath(kPowerwashSafeDirectory).Append(
kPowerwashCountMarker);
string contents;
if (!utils::ReadFile(marker_path.value(), &contents))
return -1;
base::TrimWhitespaceASCII(contents, base::TRIM_TRAILING, &contents);
if (!base::StringToInt(contents, &powerwash_count))
return -1;
return powerwash_count;
}
bool HardwareChromeOS::GetNonVolatileDirectory(base::FilePath* path) const {
*path = base::FilePath(kNonVolatileDirectory);
return true;
}
bool HardwareChromeOS::GetPowerwashSafeDirectory(base::FilePath* path) const {
*path = base::FilePath(kPowerwashSafeDirectory);
return true;
}
} // namespace chromeos_update_engine