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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/boot_control_recovery.h"
#include <base/bind.h>
#include <base/files/file_util.h>
#include <base/logging.h>
#include <base/strings/string_util.h>
#include <brillo/make_unique_ptr.h>
#include <brillo/message_loops/message_loop.h>
#include "update_engine/common/utils.h"
#include "update_engine/utils_android.h"
using std::string;
#ifndef _UE_SIDELOAD
#error "BootControlRecovery should only be used for update_engine_sideload."
#endif
// When called from update_engine_sideload, we don't attempt to dynamically load
// the right boot_control HAL, instead we use the only HAL statically linked in
// via the PRODUCT_STATIC_BOOT_CONTROL_HAL make variable and access the module
// struct directly.
extern const hw_module_t HAL_MODULE_INFO_SYM;
namespace chromeos_update_engine {
namespace boot_control {
// Factory defined in boot_control.h.
std::unique_ptr<BootControlInterface> CreateBootControl() {
std::unique_ptr<BootControlRecovery> boot_control(new BootControlRecovery());
if (!boot_control->Init()) {
return nullptr;
}
return std::move(boot_control);
}
} // namespace boot_control
bool BootControlRecovery::Init() {
const hw_module_t* hw_module;
int ret;
// For update_engine_sideload, we simulate the hw_get_module() by accessing it
// from the current process directly.
hw_module = &HAL_MODULE_INFO_SYM;
ret = 0;
if (!hw_module ||
strcmp(BOOT_CONTROL_HARDWARE_MODULE_ID, hw_module->id) != 0) {
ret = -EINVAL;
}
if (ret != 0) {
LOG(ERROR) << "Error loading boot_control HAL implementation.";
return false;
}
module_ = reinterpret_cast<boot_control_module_t*>(
const_cast<hw_module_t*>(hw_module));
module_->init(module_);
LOG(INFO) << "Loaded boot_control HAL "
<< "'" << hw_module->name << "' "
<< "version " << (hw_module->module_api_version >> 8) << "."
<< (hw_module->module_api_version & 0xff) << " "
<< "authored by '" << hw_module->author << "'.";
return true;
}
unsigned int BootControlRecovery::GetNumSlots() const {
return module_->getNumberSlots(module_);
}
BootControlInterface::Slot BootControlRecovery::GetCurrentSlot() const {
return module_->getCurrentSlot(module_);
}
bool BootControlRecovery::GetPartitionDevice(const string& partition_name,
Slot slot,
string* device) const {
// We can't use fs_mgr to look up |partition_name| because fstab
// doesn't list every slot partition (it uses the slotselect option
// to mask the suffix).
//
// We can however assume that there's an entry for the /misc mount
// point and use that to get the device file for the misc
// partition. This helps us locate the disk that |partition_name|
// resides on. From there we'll assume that a by-name scheme is used
// so we can just replace the trailing "misc" by the given
// |partition_name| and suffix corresponding to |slot|, e.g.
//
// /dev/block/platform/soc.0/7824900.sdhci/by-name/misc ->
// /dev/block/platform/soc.0/7824900.sdhci/by-name/boot_a
//
// If needed, it's possible to relax the by-name assumption in the
// future by trawling /sys/block looking for the appropriate sibling
// of misc and then finding an entry in /dev matching the sysfs
// entry.
base::FilePath misc_device;
if (!utils::DeviceForMountPoint("/misc", &misc_device))
return false;
if (!utils::IsSymlink(misc_device.value().c_str())) {
LOG(ERROR) << "Device file " << misc_device.value() << " for /misc "
<< "is not a symlink.";
return false;
}
const char* suffix = module_->getSuffix(module_, slot);
if (suffix == nullptr) {
LOG(ERROR) << "boot_control impl returned no suffix for slot "
<< SlotName(slot);
return false;
}
base::FilePath path = misc_device.DirName().Append(partition_name + suffix);
if (!base::PathExists(path)) {
LOG(ERROR) << "Device file " << path.value() << " does not exist.";
return false;
}
*device = path.value();
return true;
}
bool BootControlRecovery::IsSlotBootable(Slot slot) const {
int ret = module_->isSlotBootable(module_, slot);
if (ret < 0) {
LOG(ERROR) << "Unable to determine if slot " << SlotName(slot)
<< " is bootable: " << strerror(-ret);
return false;
}
return ret == 1;
}
bool BootControlRecovery::MarkSlotUnbootable(Slot slot) {
int ret = module_->setSlotAsUnbootable(module_, slot);
if (ret < 0) {
LOG(ERROR) << "Unable to mark slot " << SlotName(slot)
<< " as bootable: " << strerror(-ret);
return false;
}
return ret == 0;
}
bool BootControlRecovery::SetActiveBootSlot(Slot slot) {
int ret = module_->setActiveBootSlot(module_, slot);
if (ret < 0) {
LOG(ERROR) << "Unable to set the active slot to slot " << SlotName(slot)
<< ": " << strerror(-ret);
}
return ret == 0;
}
bool BootControlRecovery::MarkBootSuccessfulAsync(
base::Callback<void(bool)> callback) {
int ret = module_->markBootSuccessful(module_);
if (ret < 0) {
LOG(ERROR) << "Unable to mark boot successful: " << strerror(-ret);
}
return brillo::MessageLoop::current()->PostTask(
FROM_HERE, base::Bind(callback, ret == 0)) !=
brillo::MessageLoop::kTaskIdNull;
}
} // namespace chromeos_update_engine