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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
//
// 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/image_properties.h"
#include <fcntl.h>
#include <string>
#include <android-base/properties.h>
#include <base/logging.h>
#include <base/strings/string_util.h>
#include <bootloader_message/bootloader_message.h>
#include <brillo/osrelease_reader.h>
#include <brillo/strings/string_utils.h>
#include "update_engine/common/boot_control_interface.h"
#include "update_engine/common/constants.h"
#include "update_engine/common/platform_constants.h"
#include "update_engine/common/prefs_interface.h"
#include "update_engine/common/utils.h"
#include "update_engine/system_state.h"
#include "update_engine/utils_android.h"
using android::base::GetProperty;
using std::string;
namespace chromeos_update_engine {
namespace {
// Build time properties name used in Android Things.
const char kProductId[] = "product_id";
const char kProductVersion[] = "product_version";
const char kSystemId[] = "system_id";
const char kSystemVersion[] = "system_version";
// The path to the product_components file which stores the version of each
// components in OEM partition.
const char kProductComponentsPath[] = "/oem/os-release.d/product_components";
// Prefs used to store the powerwash settings.
const char kPrefsImgPropPowerwashAllowed[] = "img-prop-powerwash-allowed";
// System properties that identifies the "board".
const char kPropProductName[] = "ro.product.name";
const char kPropBuildFingerprint[] = "ro.build.fingerprint";
const char kPropBuildType[] = "ro.build.type";
// Default channel from factory.prop
const char kPropDefaultChannel[] = "ro.update.default_channel";
// A prefix added to the path, used for testing.
const char* root_prefix = nullptr;
string GetStringWithDefault(const brillo::OsReleaseReader& osrelease,
const string& key,
const string& default_value) {
string result;
if (osrelease.GetString(key, &result))
return result;
LOG(INFO) << "Cannot load ImageProperty " << key << ", using default value "
<< default_value;
return default_value;
}
// Open misc partition for read or write and output the fd in |out_fd|.
bool OpenMisc(bool write, int* out_fd) {
base::FilePath misc_device;
int flags = write ? O_WRONLY | O_SYNC : O_RDONLY;
if (root_prefix) {
// Use a file for unittest and create one if doesn't exist.
misc_device = base::FilePath(root_prefix).Append("misc");
if (write)
flags |= O_CREAT;
} else if (!utils::DeviceForMountPoint("/misc", &misc_device)) {
return false;
}
int fd = HANDLE_EINTR(open(misc_device.value().c_str(), flags, 0600));
if (fd < 0) {
PLOG(ERROR) << "Opening misc failed";
return false;
}
*out_fd = fd;
return true;
}
// The offset and size of the channel field in misc partition.
constexpr size_t kChannelOffset =
BOOTLOADER_MESSAGE_OFFSET_IN_MISC +
offsetof(bootloader_message_ab, update_channel);
constexpr size_t kChannelSize = sizeof(bootloader_message_ab::update_channel);
// Read channel from misc partition to |out_channel|, return false if unable to
// read misc or no channel is set in misc.
bool ReadChannelFromMisc(string* out_channel) {
int fd;
TEST_AND_RETURN_FALSE(OpenMisc(false, &fd));
ScopedFdCloser fd_closer(&fd);
char channel[kChannelSize] = {0};
ssize_t bytes_read = 0;
if (!utils::PReadAll(
fd, channel, kChannelSize - 1, kChannelOffset, &bytes_read) ||
bytes_read != kChannelSize - 1) {
PLOG(ERROR) << "Reading update channel from misc failed";
return false;
}
if (channel[0] == '\0') {
LOG(INFO) << "No channel set in misc.";
return false;
}
if (!base::EndsWith(channel, "-channel", base::CompareCase::SENSITIVE)) {
LOG(ERROR) << "Channel " << channel << " doesn't end with -channel.";
return false;
}
out_channel->assign(channel);
return true;
}
// Write |in_channel| to misc partition, return false if failed to write.
bool WriteChannelToMisc(const string& in_channel) {
int fd;
TEST_AND_RETURN_FALSE(OpenMisc(true, &fd));
ScopedFdCloser fd_closer(&fd);
if (in_channel.size() >= kChannelSize) {
LOG(ERROR) << "Channel name is too long: " << in_channel
<< ", the maximum length is " << kChannelSize - 1;
return false;
}
char channel[kChannelSize] = {0};
memcpy(channel, in_channel.data(), in_channel.size());
if (!utils::PWriteAll(fd, channel, kChannelSize, kChannelOffset)) {
PLOG(ERROR) << "Writing update channel to misc failed";
return false;
}
return true;
}
string GetTargetChannel() {
string channel;
if (!ReadChannelFromMisc(&channel))
channel = GetProperty(kPropDefaultChannel, "stable-channel");
return channel;
}
} // namespace
namespace test {
void SetImagePropertiesRootPrefix(const char* test_root_prefix) {
root_prefix = test_root_prefix;
}
} // namespace test
ImageProperties LoadImageProperties(SystemState* system_state) {
ImageProperties result;
brillo::OsReleaseReader osrelease;
if (root_prefix)
osrelease.LoadTestingOnly(base::FilePath(root_prefix));
else
osrelease.Load();
result.product_id =
GetStringWithDefault(osrelease, kProductId, "invalid-product");
result.system_id = GetStringWithDefault(
osrelease, kSystemId, "developer-boards:brillo-starter-board");
// Update the system id to match the prefix of product id for testing.
string prefix, not_used, system_id;
if (brillo::string_utils::SplitAtFirst(
result.product_id, ":", &prefix, &not_used, false) &&
brillo::string_utils::SplitAtFirst(
result.system_id, ":", &not_used, &system_id, false)) {
result.system_id = prefix + ":" + system_id;
}
result.canary_product_id = result.product_id;
result.version = GetStringWithDefault(osrelease, kProductVersion, "0.0.0.0");
result.system_version =
GetStringWithDefault(osrelease, kSystemVersion, "0.0.0.0");
// Can't read it with OsReleaseReader because it has multiple lines.
utils::ReadFile(kProductComponentsPath, &result.product_components);
result.board = GetProperty(kPropProductName, "brillo");
result.build_fingerprint = GetProperty(kPropBuildFingerprint, "none");
result.build_type = GetProperty(kPropBuildType, "");
// Android doesn't have channel information in system image, we try to read
// the channel of current slot from prefs and then fallback to use the
// persisted target channel as current channel.
string current_channel_key =
kPrefsChannelOnSlotPrefix +
std::to_string(system_state->boot_control()->GetCurrentSlot());
string current_channel;
if (!system_state->prefs()->Exists(current_channel_key) ||
!system_state->prefs()->GetString(current_channel_key, &current_channel))
current_channel = GetTargetChannel();
result.current_channel = current_channel;
result.allow_arbitrary_channels = true;
// Brillo only supports the official omaha URL.
result.omaha_url = constants::kOmahaDefaultProductionURL;
return result;
}
MutableImageProperties LoadMutableImageProperties(SystemState* system_state) {
MutableImageProperties result;
result.target_channel = GetTargetChannel();
if (!system_state->prefs()->GetBoolean(kPrefsImgPropPowerwashAllowed,
&result.is_powerwash_allowed)) {
result.is_powerwash_allowed = false;
}
return result;
}
bool StoreMutableImageProperties(SystemState* system_state,
const MutableImageProperties& properties) {
bool ret = true;
if (!WriteChannelToMisc(properties.target_channel))
ret = false;
if (!system_state->prefs()->SetBoolean(kPrefsImgPropPowerwashAllowed,
properties.is_powerwash_allowed))
ret = false;
return ret;
}
void LogImageProperties() {
// TODO(*): Implement this.
}
} // namespace chromeos_update_engine