Merge "Move libboot_control to boot_control 1.1" into rvc-dev am: 2774d5f4f0 am: c8f84dd3ec (7ad231b7) · Commits · e / os / android_bootable_recovery

boot_control/Android.bp

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		//
		// Copyright (C) 2018 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.
		//

		cc_defaults {
		name: "libboot_control_defaults",
		vendor: true,
		recovery_available: true,
		relative_install_path: "hw",

		cflags: [
		"-D_FILE_OFFSET_BITS=64",
		"-Werror",
		"-Wall",
		"-Wextra",
		],

		shared_libs: [
		"android.hardware.boot@1.1",
		"libbase",
		"liblog",
		],
		static_libs: [
		"libbootloader_message_vendor",
		"libfstab",
		],
		}

		cc_library_static {
		name: "libboot_control",
		defaults: ["libboot_control_defaults"],
		export_include_dirs: ["include"],

		srcs: ["libboot_control.cpp"],
		}

		cc_library_shared {
		name: "bootctrl.default",
		defaults: ["libboot_control_defaults"],

		srcs: ["legacy_boot_control.cpp"],

		static_libs: [
		"libboot_control",
		],
		shared_libs: [
		"libhardware",
		],
		}

boot_control/include/libboot_control/libboot_control.h

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		//
		// Copyright (C) 2019 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.
		//

		#pragma once

		#include <string>

		#include <android/hardware/boot/1.1/IBootControl.h>

		namespace android {
		namespace bootable {

		// Helper library to implement the IBootControl HAL using the misc partition.
		class BootControl {
		using MergeStatus = ::android::hardware::boot::V1_1::MergeStatus;

		public:
		bool Init();
		unsigned int GetNumberSlots();
		unsigned int GetCurrentSlot();
		bool MarkBootSuccessful();
		bool SetActiveBootSlot(unsigned int slot);
		bool SetSlotAsUnbootable(unsigned int slot);
		bool SetSlotBootable(unsigned int slot);
		bool IsSlotBootable(unsigned int slot);
		const char* GetSuffix(unsigned int slot);
		bool IsSlotMarkedSuccessful(unsigned int slot);
		bool SetSnapshotMergeStatus(MergeStatus status);
		MergeStatus GetSnapshotMergeStatus();

		bool IsValidSlot(unsigned int slot);

		const std::string& misc_device() const {
		return misc_device_;
		}

		private:
		// Whether this object was initialized with data from the bootloader message
		// that doesn't change until next reboot.
		bool initialized_ = false;

		// The path to the misc_device as reported in the fstab.
		std::string misc_device_;

		// The number of slots present on the device.
		unsigned int num_slots_ = 0;

		// The slot where we are running from.
		unsigned int current_slot_ = 0;
		};

		// Helper functions to write the Virtual A/B merge status message. These are
		// separate because BootControl uses bootloader_control_ab in vendor space,
		// whereas the Virtual A/B merge status is in system space. A HAL might not
		// use bootloader_control_ab, but may want to use the AOSP method of maintaining
		// the merge status.

		// If the Virtual A/B message has not yet been initialized, then initialize it.
		// This should be called when the BootControl HAL first loads.
		//
		// If the Virtual A/B message in misc was already initialized, true is returned.
		// If initialization was attempted, but failed, false is returned, and the HAL
		// should fail to load.
		bool InitMiscVirtualAbMessageIfNeeded();

		// Save the current merge status as well as the current slot.
		bool SetMiscVirtualAbMergeStatus(unsigned int current_slot,
		android::hardware::boot::V1_1::MergeStatus status);

		// Return the current merge status. If the saved status is SNAPSHOTTED but the
		// slot hasn't changed, the status returned will be NONE.
		bool GetMiscVirtualAbMergeStatus(unsigned int current_slot,
		android::hardware::boot::V1_1::MergeStatus* status);

		} // namespace bootable
		} // namespace android

boot_control/legacy_boot_control.cpp

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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 <string>

		#include <hardware/boot_control.h>
		#include <hardware/hardware.h>

		#include <libboot_control/libboot_control.h>

		using android::bootable::BootControl;

		struct boot_control_private_t {
		// The base struct needs to be first in the list.
		boot_control_module_t base;

		BootControl impl;
		};

		namespace {

		void BootControl_init(boot_control_module_t* module) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		impl.Init();
		}

		unsigned int BootControl_getNumberSlots(boot_control_module_t* module) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		return impl.GetNumberSlots();
		}

		unsigned int BootControl_getCurrentSlot(boot_control_module_t* module) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		return impl.GetCurrentSlot();
		}

		int BootControl_markBootSuccessful(boot_control_module_t* module) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		return impl.MarkBootSuccessful() ? 0 : -1;
		}

		int BootControl_setActiveBootSlot(boot_control_module_t* module, unsigned int slot) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		return impl.SetActiveBootSlot(slot) ? 0 : -1;
		}

		int BootControl_setSlotAsUnbootable(struct boot_control_module* module, unsigned int slot) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		return impl.SetSlotAsUnbootable(slot) ? 0 : -1;
		}

		int BootControl_isSlotBootable(struct boot_control_module* module, unsigned int slot) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		return impl.IsSlotBootable(slot) ? 0 : -1;
		}

		int BootControl_isSlotMarkedSuccessful(struct boot_control_module* module, unsigned int slot) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		return impl.IsSlotMarkedSuccessful(slot) ? 0 : -1;
		}

		const char* BootControl_getSuffix(boot_control_module_t* module, unsigned int slot) {
		auto& impl = reinterpret_cast<boot_control_private_t*>(module)->impl;
		return impl.GetSuffix(slot);
		}

		static int BootControl_open(const hw_module_t* module __unused, const char* id __unused,
		hw_device_t** device __unused) {
		/* Nothing to do currently. */
		return 0;
		}

		struct hw_module_methods_t BootControl_methods = {
		.open = BootControl_open,
		};

		} // namespace

		boot_control_private_t HAL_MODULE_INFO_SYM = {
		.base =
		{
		.common =
		{
		.tag = HARDWARE_MODULE_TAG,
		.module_api_version = BOOT_CONTROL_MODULE_API_VERSION_0_1,
		.hal_api_version = HARDWARE_HAL_API_VERSION,
		.id = BOOT_CONTROL_HARDWARE_MODULE_ID,
		.name = "AOSP reference bootctrl HAL",
		.author = "The Android Open Source Project",
		.methods = &BootControl_methods,
		},
		.init = BootControl_init,
		.getNumberSlots = BootControl_getNumberSlots,
		.getCurrentSlot = BootControl_getCurrentSlot,
		.markBootSuccessful = BootControl_markBootSuccessful,
		.setActiveBootSlot = BootControl_setActiveBootSlot,
		.setSlotAsUnbootable = BootControl_setSlotAsUnbootable,
		.isSlotBootable = BootControl_isSlotBootable,
		.getSuffix = BootControl_getSuffix,
		.isSlotMarkedSuccessful = BootControl_isSlotMarkedSuccessful,
		},
		};

boot_control/libboot_control.cpp

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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 <libboot_control/libboot_control.h>

		#include <endian.h>
		#include <errno.h>
		#include <fcntl.h>
		#include <string.h>

		#include <string>

		#include <android-base/file.h>
		#include <android-base/logging.h>
		#include <android-base/properties.h>
		#include <android-base/stringprintf.h>
		#include <android-base/unique_fd.h>

		#include <bootloader_message/bootloader_message.h>

		namespace android {
		namespace bootable {

		using ::android::hardware::boot::V1_1::MergeStatus;

		// The number of boot attempts that should be made from a new slot before
		// rolling back to the previous slot.
		constexpr unsigned int kDefaultBootAttempts = 7;
		static_assert(kDefaultBootAttempts < 8, "tries_remaining field only has 3 bits");

		constexpr unsigned int kMaxNumSlots =
		sizeof(bootloader_control::slot_info) / sizeof(bootloader_control::slot_info[0]);
		constexpr const char* kSlotSuffixes[kMaxNumSlots] = { "_a", "_b", "_c", "_d" };
		constexpr off_t kBootloaderControlOffset = offsetof(bootloader_message_ab, slot_suffix);

		static uint32_t CRC32(const uint8_t* buf, size_t size) {
		static uint32_t crc_table[256];

		// Compute the CRC-32 table only once.
		if (!crc_table[1]) {
		for (uint32_t i = 0; i < 256; ++i) {
		uint32_t crc = i;
		for (uint32_t j = 0; j < 8; ++j) {
		uint32_t mask = -(crc & 1);
		crc = (crc >> 1) ^ (0xEDB88320 & mask);
		}
		crc_table[i] = crc;
		}
		}

		uint32_t ret = -1;
		for (size_t i = 0; i < size; ++i) {
		ret = (ret >> 8) ^ crc_table[(ret ^ buf[i]) & 0xFF];
		}

		return ~ret;
		}

		// Return the little-endian representation of the CRC-32 of the first fields
		// in \|boot_ctrl\| up to the crc32_le field.
		uint32_t BootloaderControlLECRC(const bootloader_control* boot_ctrl) {
		return htole32(
		CRC32(reinterpret_cast<const uint8_t*>(boot_ctrl), offsetof(bootloader_control, crc32_le)));
		}

		bool LoadBootloaderControl(const std::string& misc_device, bootloader_control* buffer) {
		android::base::unique_fd fd(open(misc_device.c_str(), O_RDONLY));
		if (fd.get() == -1) {
		PLOG(ERROR) << "failed to open " << misc_device;
		return false;
		}
		if (lseek(fd, kBootloaderControlOffset, SEEK_SET) != kBootloaderControlOffset) {
		PLOG(ERROR) << "failed to lseek " << misc_device;
		return false;
		}
		if (!android::base::ReadFully(fd.get(), buffer, sizeof(bootloader_control))) {
		PLOG(ERROR) << "failed to read " << misc_device;
		return false;
		}
		return true;
		}

		bool UpdateAndSaveBootloaderControl(const std::string& misc_device, bootloader_control* buffer) {
		buffer->crc32_le = BootloaderControlLECRC(buffer);
		android::base::unique_fd fd(open(misc_device.c_str(), O_WRONLY \| O_SYNC));
		if (fd.get() == -1) {
		PLOG(ERROR) << "failed to open " << misc_device;
		return false;
		}
		if (lseek(fd.get(), kBootloaderControlOffset, SEEK_SET) != kBootloaderControlOffset) {
		PLOG(ERROR) << "failed to lseek " << misc_device;
		return false;
		}
		if (!android::base::WriteFully(fd.get(), buffer, sizeof(bootloader_control))) {
		PLOG(ERROR) << "failed to write " << misc_device;
		return false;
		}
		return true;
		}

		void InitDefaultBootloaderControl(BootControl* control, bootloader_control* boot_ctrl) {
		memset(boot_ctrl, 0, sizeof(*boot_ctrl));

		unsigned int current_slot = control->GetCurrentSlot();
		if (current_slot < kMaxNumSlots) {
		strlcpy(boot_ctrl->slot_suffix, kSlotSuffixes[current_slot], sizeof(boot_ctrl->slot_suffix));
		}
		boot_ctrl->magic = BOOT_CTRL_MAGIC;
		boot_ctrl->version = BOOT_CTRL_VERSION;

		// Figure out the number of slots by checking if the partitions exist,
		// otherwise assume the maximum supported by the header.
		boot_ctrl->nb_slot = kMaxNumSlots;
		std::string base_path = control->misc_device();
		size_t last_path_sep = base_path.rfind('/');
		if (last_path_sep != std::string::npos) {
		// We test the existence of the "boot" partition on each possible slot,
		// which is a partition required by Android Bootloader Requirements.
		base_path = base_path.substr(0, last_path_sep + 1) + "boot";
		int last_existing_slot = -1;
		int first_missing_slot = -1;
		for (unsigned int slot = 0; slot < kMaxNumSlots; ++slot) {
		std::string partition_path = base_path + kSlotSuffixes[slot];
		struct stat part_stat;
		int err = stat(partition_path.c_str(), &part_stat);
		if (!err) {
		last_existing_slot = slot;
		LOG(INFO) << "Found slot: " << kSlotSuffixes[slot];
		} else if (err < 0 && errno == ENOENT && first_missing_slot == -1) {
		first_missing_slot = slot;
		}
		}
		// We only declare that we found the actual number of slots if we found all
		// the boot partitions up to the number of slots, and no boot partition
		// after that. Not finding any of the boot partitions implies a problem so
		// we just leave the number of slots in the maximum value.
		if ((last_existing_slot != -1 && last_existing_slot + 1 == first_missing_slot) \|\|
		(first_missing_slot == -1 && last_existing_slot + 1 == kMaxNumSlots)) {
		boot_ctrl->nb_slot = last_existing_slot + 1;
		LOG(INFO) << "Found a system with " << last_existing_slot + 1 << " slots.";
		}
		}

		for (unsigned int slot = 0; slot < kMaxNumSlots; ++slot) {
		slot_metadata entry = {};

		if (slot < boot_ctrl->nb_slot) {
		entry.priority = 7;
		entry.tries_remaining = kDefaultBootAttempts;
		entry.successful_boot = 0;
		} else {
		entry.priority = 0; // Unbootable
		}

		// When the boot_control stored on disk is invalid, we assume that the
		// current slot is successful. The bootloader should repair this situation
		// before booting and write a valid boot_control slot, so if we reach this
		// stage it means that the misc partition was corrupted since boot.
		if (current_slot == slot) {
		entry.successful_boot = 1;
		}

		boot_ctrl->slot_info[slot] = entry;
		}
		boot_ctrl->recovery_tries_remaining = 0;

		boot_ctrl->crc32_le = BootloaderControlLECRC(boot_ctrl);
		}

		// Return the index of the slot suffix passed or -1 if not a valid slot suffix.
		int SlotSuffixToIndex(const char* suffix) {
		for (unsigned int slot = 0; slot < kMaxNumSlots; ++slot) {
		if (!strcmp(kSlotSuffixes[slot], suffix)) return slot;
		}
		return -1;
		}

		// Initialize the boot_control_private struct with the information from
		// the bootloader_message buffer stored in \|boot_ctrl\|. Returns whether the
		// initialization succeeded.
		bool BootControl::Init() {
		if (initialized_) return true;

		// Initialize the current_slot from the read-only property. If the property
		// was not set (from either the command line or the device tree), we can later
		// initialize it from the bootloader_control struct.
		std::string suffix_prop = android::base::GetProperty("ro.boot.slot_suffix", "");
		if (suffix_prop.empty()) {
		LOG(ERROR) << "Slot suffix property is not set";
		return false;
		}
		current_slot_ = SlotSuffixToIndex(suffix_prop.c_str());

		std::string err;
		std::string device = get_bootloader_message_blk_device(&err);
		if (device.empty()) {
		LOG(ERROR) << "Could not find bootloader message block device: " << err;
		return false;
		}

		bootloader_control boot_ctrl;
		if (!LoadBootloaderControl(device.c_str(), &boot_ctrl)) {
		LOG(ERROR) << "Failed to load bootloader control block";
		return false;
		}

		// Note that since there isn't a module unload function this memory is leaked.
		// We use `device` below sometimes, so it's not moved out of here.
		misc_device_ = device;
		initialized_ = true;

		// Validate the loaded data, otherwise we will destroy it and re-initialize it
		// with the current information.
		uint32_t computed_crc32 = BootloaderControlLECRC(&boot_ctrl);
		if (boot_ctrl.crc32_le != computed_crc32) {
		LOG(WARNING) << "Invalid boot control found, expected CRC-32 0x" << std::hex << computed_crc32
		<< " but found 0x" << std::hex << boot_ctrl.crc32_le << ". Re-initializing.";
		InitDefaultBootloaderControl(this, &boot_ctrl);
		UpdateAndSaveBootloaderControl(device.c_str(), &boot_ctrl);
		}

		if (!InitMiscVirtualAbMessageIfNeeded()) {
		return false;
		}

		num_slots_ = boot_ctrl.nb_slot;
		return true;
		}

		unsigned int BootControl::GetNumberSlots() {
		return num_slots_;
		}

		unsigned int BootControl::GetCurrentSlot() {
		return current_slot_;
		}

		bool BootControl::MarkBootSuccessful() {
		bootloader_control bootctrl;
		if (!LoadBootloaderControl(misc_device_, &bootctrl)) return false;

		bootctrl.slot_info[current_slot_].successful_boot = 1;
		// tries_remaining == 0 means that the slot is not bootable anymore, make
		// sure we mark the current slot as bootable if it succeeds in the last
		// attempt.
		bootctrl.slot_info[current_slot_].tries_remaining = 1;
		return UpdateAndSaveBootloaderControl(misc_device_, &bootctrl);
		}

		bool BootControl::SetActiveBootSlot(unsigned int slot) {
		if (slot >= kMaxNumSlots \|\| slot >= num_slots_) {
		// Invalid slot number.
		return false;
		}

		bootloader_control bootctrl;
		if (!LoadBootloaderControl(misc_device_, &bootctrl)) return false;

		// Set every other slot with a lower priority than the new "active" slot.
		const unsigned int kActivePriority = 15;
		const unsigned int kActiveTries = 6;
		for (unsigned int i = 0; i < num_slots_; ++i) {
		if (i != slot) {
		if (bootctrl.slot_info[i].priority >= kActivePriority)
		bootctrl.slot_info[i].priority = kActivePriority - 1;
		}
		}

		// Note that setting a slot as active doesn't change the successful bit.
		// The successful bit will only be changed by setSlotAsUnbootable().
		bootctrl.slot_info[slot].priority = kActivePriority;
		bootctrl.slot_info[slot].tries_remaining = kActiveTries;

		// Setting the current slot as active is a way to revert the operation that
		// set another slot as active at the end of an updater. This is commonly
		// used to cancel the pending update. We should only reset the verity_corrpted
		// bit when attempting a new slot, otherwise the verity bit on the current
		// slot would be flip.
		if (slot != current_slot_) bootctrl.slot_info[slot].verity_corrupted = 0;

		return UpdateAndSaveBootloaderControl(misc_device_, &bootctrl);
		}

		bool BootControl::SetSlotAsUnbootable(unsigned int slot) {
		if (slot >= kMaxNumSlots \|\| slot >= num_slots_) {
		// Invalid slot number.
		return false;
		}

		bootloader_control bootctrl;
		if (!LoadBootloaderControl(misc_device_, &bootctrl)) return false;

		// The only way to mark a slot as unbootable, regardless of the priority is to
		// set the tries_remaining to 0.
		bootctrl.slot_info[slot].successful_boot = 0;
		bootctrl.slot_info[slot].tries_remaining = 0;
		return UpdateAndSaveBootloaderControl(misc_device_, &bootctrl);
		}

		bool BootControl::IsSlotBootable(unsigned int slot) {
		if (slot >= kMaxNumSlots \|\| slot >= num_slots_) {
		// Invalid slot number.
		return false;
		}

		bootloader_control bootctrl;
		if (!LoadBootloaderControl(misc_device_, &bootctrl)) return false;

		return bootctrl.slot_info[slot].tries_remaining != 0;
		}

		bool BootControl::IsSlotMarkedSuccessful(unsigned int slot) {
		if (slot >= kMaxNumSlots \|\| slot >= num_slots_) {
		// Invalid slot number.
		return false;
		}

		bootloader_control bootctrl;
		if (!LoadBootloaderControl(misc_device_, &bootctrl)) return false;

		return bootctrl.slot_info[slot].successful_boot && bootctrl.slot_info[slot].tries_remaining;
		}

		bool BootControl::IsValidSlot(unsigned int slot) {
		return slot < kMaxNumSlots && slot < num_slots_;
		}

		bool BootControl::SetSnapshotMergeStatus(MergeStatus status) {
		return SetMiscVirtualAbMergeStatus(current_slot_, status);
		}

		MergeStatus BootControl::GetSnapshotMergeStatus() {
		MergeStatus status;
		if (!GetMiscVirtualAbMergeStatus(current_slot_, &status)) {
		return MergeStatus::UNKNOWN;
		}
		return status;
		}

		const char* BootControl::GetSuffix(unsigned int slot) {
		if (slot >= kMaxNumSlots \|\| slot >= num_slots_) {
		return nullptr;
		}
		return kSlotSuffixes[slot];
		}

		bool InitMiscVirtualAbMessageIfNeeded() {
		std::string err;
		misc_virtual_ab_message message;
		if (!ReadMiscVirtualAbMessage(&message, &err)) {
		LOG(ERROR) << "Could not read merge status: " << err;
		return false;
		}

		if (message.version == MISC_VIRTUAL_AB_MESSAGE_VERSION &&
		message.magic == MISC_VIRTUAL_AB_MAGIC_HEADER) {
		// Already initialized.
		return true;
		}

		message = {};
		message.version = MISC_VIRTUAL_AB_MESSAGE_VERSION;
		message.magic = MISC_VIRTUAL_AB_MAGIC_HEADER;
		if (!WriteMiscVirtualAbMessage(message, &err)) {
		LOG(ERROR) << "Could not write merge status: " << err;
		return false;
		}
		return true;
		}

		bool SetMiscVirtualAbMergeStatus(unsigned int current_slot,
		android::hardware::boot::V1_1::MergeStatus status) {
		std::string err;
		misc_virtual_ab_message message;

		if (!ReadMiscVirtualAbMessage(&message, &err)) {
		LOG(ERROR) << "Could not read merge status: " << err;
		return false;
		}

		message.merge_status = static_cast<uint8_t>(status);
		message.source_slot = current_slot;
		if (!WriteMiscVirtualAbMessage(message, &err)) {
		LOG(ERROR) << "Could not write merge status: " << err;
		return false;
		}
		return true;
		}

		bool GetMiscVirtualAbMergeStatus(unsigned int current_slot,
		android::hardware::boot::V1_1::MergeStatus* status) {
		std::string err;
		misc_virtual_ab_message message;

		if (!ReadMiscVirtualAbMessage(&message, &err)) {
		LOG(ERROR) << "Could not read merge status: " << err;
		return false;
		}

		// If the slot reverted after having created a snapshot, then the snapshot will
		// be thrown away at boot. Thus we don't count this as being in a snapshotted
		// state.
		*status = static_cast<MergeStatus>(message.merge_status);
		if (*status == MergeStatus::SNAPSHOTTED && current_slot == message.source_slot) {
		*status = MergeStatus::NONE;
		}
		return true;
		}

		} // namespace bootable
		} // namespace android

bootloader_message/include/bootloader_message/bootloader_message.h

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