oem/ibm/libpldmresponder/inband_code_update.cpp

#include "inband_code_update.hpp"

#include "libpldmresponder/pdr.hpp"
#include "oem_ibm_handler.hpp"
#include "xyz/openbmc_project/Common/error.hpp"

#include <arpa/inet.h>
#include <libpldm/entity.h>

#include <nlohmann/json.hpp>
#include <phosphor-logging/lg2.hpp>
#include <sdbusplus/server.hpp>
#include <xyz/openbmc_project/Dump/NewDump/server.hpp>

#include <exception>
#include <fstream>

PHOSPHOR_LOG2_USING;

namespace pldm
{
using namespace utils;

namespace responder
{
using namespace oem_ibm_platform;
using namespace oem_ibm_bios;

/** @brief Directory where the lid files without a header are stored */
auto lidDirPath = fs::path(LID_STAGING_DIR) / "lid";

/** @brief Directory where the image files are stored as they are built */
auto imageDirPath = fs::path(LID_STAGING_DIR) / "image";

/** @brief Directory where the code update tarball files are stored */
auto updateDirPath = fs::path(LID_STAGING_DIR) / "update";

/** @brief The file name of the code update tarball */
constexpr auto tarImageName = "image.tar";

/** @brief The file name of the hostfw image */
constexpr auto hostfwImageName = "image-hostfw";

/** @brief The path to the code update tarball file */
auto tarImagePath = fs::path(imageDirPath) / tarImageName;

/** @brief The path to the hostfw image */
auto hostfwImagePath = fs::path(imageDirPath) / hostfwImageName;

/** @brief The path to the tarball file expected by the phosphor software
 *         manager */
auto updateImagePath = fs::path("/tmp/images") / tarImageName;

/** @brief Current boot side */
constexpr auto bootSideAttrName = "fw_boot_side_current";

/** @brief Next boot side */
constexpr auto bootNextSideAttrName = "fw_boot_side";

std::string CodeUpdate::fetchCurrentBootSide()
{
    return currBootSide;
}

std::string CodeUpdate::fetchNextBootSide()
{
    return nextBootSide;
}

int CodeUpdate::setCurrentBootSide(const std::string& currSide)
{
    currBootSide = currSide;
    return PLDM_SUCCESS;
}

int CodeUpdate::setNextBootSide(const std::string& nextSide)
{
    info("setNextBootSide, nextSide={NXT_SIDE}", "NXT_SIDE", nextSide);
    pldm_boot_side_data pldmBootSideData = readBootSideFile();
    currBootSide =
        (pldmBootSideData.current_boot_side == "Perm" ? Pside : Tside);
    nextBootSide = nextSide;
    pldmBootSideData.next_boot_side = (nextSide == Pside ? "Perm" : "Temp");
    std::string objPath{};
    if (nextBootSide == currBootSide)
    {
        info(
            "Current bootside is same as next boot side, setting priority of running version 0");
        objPath = runningVersion;
    }
    else
    {
        info(
            "Current bootside is not same as next boot side, setting priority of non running version 0");
        objPath = nonRunningVersion;
    }
    if (objPath.empty())
    {
        error("no nonRunningVersion present");
        return PLDM_PLATFORM_INVALID_STATE_VALUE;
    }

    try
    {
        auto priorityPropValue = dBusIntf->getDbusPropertyVariant(
            objPath.c_str(), "Priority", redundancyIntf);
        const auto& priorityValue = std::get<uint8_t>(priorityPropValue);
        if (priorityValue == 0)
        {
            // Requested next boot side is already set
            return PLDM_SUCCESS;
        }
    }
    catch (const std::exception& e)
    {
        // Alternate side may not be present due to a failed code update
        error("Alternate side may not be present due to a failed code update. "
              "ERROR: {ERR}",
              "ERR", e);
        return PLDM_PLATFORM_INVALID_STATE_VALUE;
    }

    pldm::utils::DBusMapping dbusMapping{objPath, redundancyIntf, "Priority",
                                         "uint8_t"};
    uint8_t val = 0;
    pldm::utils::PropertyValue value = static_cast<uint8_t>(val);
    try
    {
        dBusIntf->setDbusProperty(dbusMapping, value);
    }
    catch (const std::exception& e)
    {
        error("Failed to set the next boot side to {PATH} , error - {ERROR}",
              "PATH", objPath, "ERROR", e);
        return PLDM_ERROR;
    }
    writeBootSideFile(pldmBootSideData);
    return PLDM_SUCCESS;
}

int CodeUpdate::setRequestedApplyTime()
{
    int rc = PLDM_SUCCESS;
    pldm::utils::PropertyValue value =
        "xyz.openbmc_project.Software.ApplyTime.RequestedApplyTimes.OnReset";
    DBusMapping dbusMapping;
    dbusMapping.objectPath = "/xyz/openbmc_project/software/apply_time";
    dbusMapping.interface = "xyz.openbmc_project.Software.ApplyTime";
    dbusMapping.propertyName = "RequestedApplyTime";
    dbusMapping.propertyType = "string";
    try
    {
        pldm::utils::DBusHandler().setDbusProperty(dbusMapping, value);
    }
    catch (const std::exception& e)
    {
        error(
            "Failed to set property '{PROPERTY}' at path '{PATH}' and interface '{INTERFACE}', error - {ERROR}",
            "PATH", dbusMapping.objectPath, "INTERFACE", dbusMapping.interface,
            "PROPERTY", dbusMapping.propertyName, "ERROR", e);
        rc = PLDM_ERROR;
    }
    return rc;
}

int CodeUpdate::setRequestedActivation()
{
    int rc = PLDM_SUCCESS;
    pldm::utils::PropertyValue value =
        "xyz.openbmc_project.Software.Activation.RequestedActivations.Active";
    DBusMapping dbusMapping;
    dbusMapping.objectPath = newImageId;
    dbusMapping.interface = "xyz.openbmc_project.Software.Activation";
    dbusMapping.propertyName = "RequestedActivation";
    dbusMapping.propertyType = "string";
    try
    {
        pldm::utils::DBusHandler().setDbusProperty(dbusMapping, value);
    }
    catch (const std::exception& e)
    {
        error(
            "Failed to set property {PROPERTY} at path '{PATH}' and interface '{INTERFACE}', error - {ERROR}",
            "PATH", dbusMapping.objectPath, "INTERFACE", dbusMapping.interface,
            "PROPERTY", dbusMapping.propertyName, "ERROR", e);
        rc = PLDM_ERROR;
    }
    return rc;
}

void CodeUpdate::setVersions()
{
    PendingAttributesList biosAttrList;
    static constexpr auto mapperService = "xyz.openbmc_project.ObjectMapper";
    static constexpr auto functionalObjPath =
        "/xyz/openbmc_project/software/functional";
    static constexpr auto activeObjPath =
        "/xyz/openbmc_project/software/active";
    static constexpr auto propIntf = "org.freedesktop.DBus.Properties";
    static constexpr auto pathIntf = "xyz.openbmc_project.Common.FilePath";

    auto& bus = dBusIntf->getBus();
    try
    {
        auto method = bus.new_method_call(mapperService, functionalObjPath,
                                          propIntf, "Get");
        method.append("xyz.openbmc_project.Association", "endpoints");
        std::variant<std::vector<std::string>> paths;

        auto reply = bus.call(method, dbusTimeout);
        reply.read(paths);

        runningVersion = std::get<std::vector<std::string>>(paths)[0];
        auto runningPathPropValue = dBusIntf->getDbusPropertyVariant(
            runningVersion.c_str(), "Path", pathIntf);
        const auto& runningPath = std::get<std::string>(runningPathPropValue);

        auto method1 =
            bus.new_method_call(mapperService, activeObjPath, propIntf, "Get");
        method1.append("xyz.openbmc_project.Association", "endpoints");

        auto reply1 = bus.call(method1, dbusTimeout);
        reply1.read(paths);
        for (const auto& path : std::get<std::vector<std::string>>(paths))
        {
            if (path != runningVersion)
            {
                nonRunningVersion = path;
                break;
            }
        }
        if (!fs::exists(bootSideDirPath))
        {
            pldm_boot_side_data pldmBootSideData;
            std::string nextBootSideBiosValue = "Temp";
            auto attributeValue = getBiosAttrValue<std::string>("fw_boot_side");

            // We enter this path during Genesis boot/boot after Factory reset.
            // PLDM waits for Entity manager to populate System Type. After
            // receiving system Type from EM it populates the bios attributes
            // specific to that system We do not have bios attributes populated
            // when we reach here so setting it to default value of the
            // attribute as mentioned in the json files.
            if (attributeValue.has_value())
            {
                nextBootSideBiosValue = attributeValue.value();
            }
            else
            {
                info(
                    "Boot side is not initialized yet, so setting default value(Temp). Request was ignored to set the Boot side to {SIDE}",
                    "SIDE", nextBootSideBiosValue);
                nextBootSideBiosValue = "Temp";
            }
            pldmBootSideData.current_boot_side = nextBootSideBiosValue;
            pldmBootSideData.next_boot_side = nextBootSideBiosValue;
            pldmBootSideData.running_version_object = runningPath;

            writeBootSideFile(pldmBootSideData);
            biosAttrList.emplace_back(std::make_pair(
                bootSideAttrName,
                std::make_tuple(EnumAttribute,
                                pldmBootSideData.current_boot_side)));
            biosAttrList.push_back(std::make_pair(
                bootNextSideAttrName,
                std::make_tuple(EnumAttribute,
                                pldmBootSideData.next_boot_side)));
            setBiosAttr(biosAttrList);
        }
        else
        {
            pldm_boot_side_data pldmBootSideData = readBootSideFile();
            if (pldmBootSideData.running_version_object != runningPath)
            {
                info(
                    "BMC have booted with the new image runningPath={RUNN_PATH}",
                    "RUNN_PATH", runningPath.c_str());
                info("Previous Image was: {RUNN_VERS}", "RUNN_VERS",
                     pldmBootSideData.running_version_object);
                auto current_boot_side =
                    (pldmBootSideData.current_boot_side == "Temp" ? "Perm"
                                                                  : "Temp");
                pldmBootSideData.current_boot_side = current_boot_side;
                pldmBootSideData.next_boot_side = current_boot_side;
                pldmBootSideData.running_version_object = runningPath;
                writeBootSideFile(pldmBootSideData);
                biosAttrList.emplace_back(std::make_pair(
                    bootSideAttrName,
                    std::make_tuple(EnumAttribute,
                                    pldmBootSideData.current_boot_side)));
                biosAttrList.push_back(std::make_pair(
                    bootNextSideAttrName,
                    std::make_tuple(EnumAttribute,
                                    pldmBootSideData.next_boot_side)));
                setBiosAttr(biosAttrList);
            }
            else
            {
                info(
                    "BMC have booted with the previous image runningPath={RUNN_PATH}",
                    "RUNN_PATH", pldmBootSideData.running_version_object);
                pldm_boot_side_data pldmBootSideData = readBootSideFile();
                pldmBootSideData.next_boot_side =
                    pldmBootSideData.current_boot_side;
                writeBootSideFile(pldmBootSideData);
                biosAttrList.emplace_back(std::make_pair(
                    bootSideAttrName,
                    std::make_tuple(EnumAttribute,
                                    pldmBootSideData.current_boot_side)));
                biosAttrList.push_back(std::make_pair(
                    bootNextSideAttrName,
                    std::make_tuple(EnumAttribute,
                                    pldmBootSideData.next_boot_side)));
                setBiosAttr(biosAttrList);
            }
            currBootSide =
                (pldmBootSideData.current_boot_side == "Temp" ? Tside : Pside);
            nextBootSide =
                (pldmBootSideData.next_boot_side == "Temp" ? Tside : Pside);
        }
    }
    catch (const std::exception& e)
    {
        error(
            "Failed to make a d-bus call to Object Mapper Association, error - {ERROR}",
            "ERROR", e);
        return;
    }

    using namespace sdbusplus::bus::match::rules;
    captureNextBootSideChange.push_back(
        std::make_unique<sdbusplus::bus::match_t>(
            pldm::utils::DBusHandler::getBus(),
            propertiesChanged(runningVersion, redundancyIntf),
            [this](sdbusplus::message_t& msg) {
                DbusChangedProps props;
                std::string iface;
                msg.read(iface, props);
                processPriorityChangeNotification(props);
            }));
    fwUpdateMatcher.push_back(std::make_unique<sdbusplus::bus::match_t>(
        pldm::utils::DBusHandler::getBus(),
        "interface='org.freedesktop.DBus.ObjectManager',type='signal',"
        "member='InterfacesAdded',path='/xyz/openbmc_project/software'",
        [this](sdbusplus::message_t& msg) {
            DBusInterfaceAdded interfaces;
            sdbusplus::message::object_path path;
            msg.read(path, interfaces);

            for (auto& interface : interfaces)
            {
                if (interface.first ==
                    "xyz.openbmc_project.Software.Activation")
                {
                    auto imageInterface =
                        "xyz.openbmc_project.Software.Activation";
                    auto imageObjPath = path.str.c_str();

                    try
                    {
                        auto propVal = dBusIntf->getDbusPropertyVariant(
                            imageObjPath, "Activation", imageInterface);
                        if (isCodeUpdateInProgress())
                        {
                            newImageId = path.str;
                            if (!imageActivationMatch)
                            {
                                imageActivationMatch = std::make_unique<
                                    sdbusplus::bus::match_t>(
                                    pldm::utils::DBusHandler::getBus(),
                                    propertiesChanged(newImageId,
                                                      "xyz.openbmc_project."
                                                      "Software.Activation"),
                                    [this](sdbusplus::message_t& msg) {
                                        DbusChangedProps props;
                                        std::string iface;
                                        msg.read(iface, props);
                                        const auto itr =
                                            props.find("Activation");
                                        if (itr != props.end())
                                        {
                                            PropertyValue value = itr->second;
                                            auto propVal =
                                                std::get<std::string>(value);
                                            if (propVal ==
                                                "xyz.openbmc_project.Software."
                                                "Activation.Activations.Active")
                                            {
                                                CodeUpdateState state =
                                                    CodeUpdateState::END;
                                                setCodeUpdateProgress(false);
                                                auto sensorId =
                                                    getFirmwareUpdateSensor();
                                                sendStateSensorEvent(
                                                    sensorId,
                                                    PLDM_STATE_SENSOR_STATE, 0,
                                                    uint8_t(state),
                                                    uint8_t(CodeUpdateState::
                                                                START));
                                                newImageId.clear();
                                            }
                                            else if (propVal ==
                                                         "xyz.openbmc_project."
                                                         "Software.Activation."
                                                         "Activations.Failed" ||
                                                     propVal ==
                                                         "xyz.openbmc_"
                                                         "project.Software."
                                                         "Activation."
                                                         "Activations."
                                                         "Invalid")
                                            {
                                                CodeUpdateState state =
                                                    CodeUpdateState::FAIL;
                                                setCodeUpdateProgress(false);
                                                auto sensorId =
                                                    getFirmwareUpdateSensor();
                                                sendStateSensorEvent(
                                                    sensorId,
                                                    PLDM_STATE_SENSOR_STATE, 0,
                                                    uint8_t(state),
                                                    uint8_t(CodeUpdateState::
                                                                START));
                                                newImageId.clear();
                                            }
                                        }
                                    });
                            }
                            auto rc = setRequestedActivation();
                            if (rc != PLDM_SUCCESS)
                            {
                                error("Could not set Requested Activation");
                                CodeUpdateState state = CodeUpdateState::FAIL;
                                setCodeUpdateProgress(false);
                                auto sensorId = getFirmwareUpdateSensor();
                                sendStateSensorEvent(
                                    sensorId, PLDM_STATE_SENSOR_STATE, 0,
                                    uint8_t(state),
                                    uint8_t(CodeUpdateState::START));
                            }
                            break;
                        }
                        else
                        {
                            // Out of band update
                            processRenameEvent();
                        }
                    }
                    catch (const sdbusplus::exception_t& e)
                    {
                        error(
                            "Failed to get activation status for interface '{INTERFACE}' and object path '{PATH}', error - {ERROR}",
                            "ERROR", e, "INTERFACE", imageInterface, "PATH",
                            imageObjPath);
                    }
                }
            }
        }));
}

void CodeUpdate::processRenameEvent()
{
    info("Processing Rename Event");

    PendingAttributesList biosAttrList;
    pldm_boot_side_data pldmBootSideData = readBootSideFile();
    pldmBootSideData.current_boot_side = "Perm";
    pldmBootSideData.next_boot_side = "Perm";

    currBootSide = Pside;
    nextBootSide = Pside;

    auto sensorId = getBootSideRenameStateSensor();
    info("Received sendor id for rename {ID}", "ID", sensorId);
    sendStateSensorEvent(sensorId, PLDM_STATE_SENSOR_STATE, 0,
                         PLDM_OEM_IBM_BOOT_SIDE_RENAME_STATE_RENAMED,
                         PLDM_OEM_IBM_BOOT_SIDE_RENAME_STATE_NOT_RENAMED);
    writeBootSideFile(pldmBootSideData);
    biosAttrList.emplace_back(std::make_pair(
        bootSideAttrName,
        std::make_tuple(EnumAttribute, pldmBootSideData.current_boot_side)));
    biosAttrList.push_back(std::make_pair(
        bootNextSideAttrName,
        std::make_tuple(EnumAttribute, pldmBootSideData.next_boot_side)));
    setBiosAttr(biosAttrList);
}

void CodeUpdate::writeBootSideFile(const pldm_boot_side_data& pldmBootSideData)
{
    try
    {
        fs::create_directories(fs::path(bootSideDirPath).parent_path());
        std::ofstream writeFile(bootSideDirPath, std::ios::out);
        if (!writeFile.is_open())
        {
            error("Failed to open bootside file {FILE} for writing", "FILE",
                  bootSideDirPath);
            return;
        }

        nlohmann::json data;
        data["CurrentBootSide"] = pldmBootSideData.current_boot_side;
        data["NextBootSide"] = pldmBootSideData.next_boot_side;
        data["RunningObject"] = pldmBootSideData.running_version_object;

        try
        {
            writeFile << data.dump(4);
        }
        catch (const nlohmann::json::exception& e)
        {
            error("JSON serialization for BootSide failed: {ERROR}", "ERROR",
                  e);
            return;
        }

        writeFile.close();
    }
    catch (const std::exception& e)
    {
        error("Error {ERROR] while writing bootside file: {FILE}", "ERROR", e,
              "FILE", bootSideDirPath);
    }
}

pldm_boot_side_data CodeUpdate::readBootSideFile()
{
    pldm_boot_side_data pldmBootSideDataRead{};

    std::ifstream readFile(bootSideDirPath, std::ios::in);

    if (!readFile)
    {
        error("Failed to read Bootside file");
        return pldmBootSideDataRead;
    }

    nlohmann::json jsonBootSideData;
    readFile >> jsonBootSideData;

    pldm_boot_side_data data;
    data.current_boot_side = jsonBootSideData.value("CurrentBootSide", "");
    data.next_boot_side = jsonBootSideData.value("NextBootSide", "");
    data.running_version_object = jsonBootSideData.value("RunningObject", "");

    readFile.close();

    return pldmBootSideDataRead;
}

void CodeUpdate::processPriorityChangeNotification(
    const DbusChangedProps& chProperties)
{
    error("Processing priority change notification");
    static constexpr auto propName = "Priority";
    const auto it = chProperties.find(propName);
    if (it == chProperties.end())
    {
        return;
    }
    uint8_t newVal = std::get<uint8_t>(it->second);

    pldm_boot_side_data pldmBootSideData = readBootSideFile();
    pldmBootSideData.next_boot_side =
        (newVal == 0)
            ? pldmBootSideData.current_boot_side
            : ((pldmBootSideData.current_boot_side == "Temp") ? "Perm"
                                                              : "Temp");
    writeBootSideFile(pldmBootSideData);
    nextBootSide = (pldmBootSideData.next_boot_side == "Temp" ? Tside : Pside);
    std::string currNextBootSide;
    auto attributeValue = getBiosAttrValue<std::string>(bootNextSideAttrName);
    if (attributeValue.has_value())
    {
        currNextBootSide = attributeValue.value();
    }

    if (currNextBootSide == nextBootSide)
    {
        return;
    }
    PendingAttributesList biosAttrList;
    biosAttrList.push_back(std::make_pair(
        bootNextSideAttrName,
        std::make_tuple(EnumAttribute, pldmBootSideData.next_boot_side)));
    setBiosAttr(biosAttrList);
}

void CodeUpdate::setOemPlatformHandler(
    pldm::responder::oem_platform::Handler* handler)
{
    oemPlatformHandler = handler;
}

void CodeUpdate::clearDirPath(const std::string& dirPath)
{
    if (!fs::is_directory(dirPath))
    {
        error("The directory '{PATH}' does not exist", "PATH", dirPath);
        return;
    }
    for (const auto& iter : fs::directory_iterator(dirPath))
    {
        fs::remove_all(iter);
    }
}

void CodeUpdate::sendStateSensorEvent(
    uint16_t sensorId, enum sensor_event_class_states sensorEventClass,
    uint8_t sensorOffset, uint8_t eventState, uint8_t prevEventState)
{
    pldm::responder::oem_ibm_platform::Handler* oemIbmPlatformHandler =
        dynamic_cast<pldm::responder::oem_ibm_platform::Handler*>(
            oemPlatformHandler);
    oemIbmPlatformHandler->sendStateSensorEvent(
        sensorId, sensorEventClass, sensorOffset, eventState, prevEventState);
}

void CodeUpdate::deleteImage()
{
    static constexpr auto UPDATER_SERVICE =
        "xyz.openbmc_project.Software.BMC.Updater";
    static constexpr auto SW_OBJ_PATH = "/xyz/openbmc_project/software";
    static constexpr auto DELETE_INTF =
        "xyz.openbmc_project.Collection.DeleteAll";

    auto& bus = dBusIntf->getBus();
    try
    {
        auto method = bus.new_method_call(UPDATER_SERVICE, SW_OBJ_PATH,
                                          DELETE_INTF, "DeleteAll");
        bus.call_noreply(method, dbusTimeout);
    }
    catch (const std::exception& e)
    {
        error(
            "Failed to delete image at path '{PATH}' and interface '{INTERFACE}', error - {ERROR}",
            "PATH", SW_OBJ_PATH, "INTERFACE", DELETE_INTF, "ERROR", e);
        return;
    }
}

uint8_t fetchBootSide(uint16_t entityInstance, CodeUpdate* codeUpdate)
{
    uint8_t sensorOpState = tSideNum;
    if (entityInstance == 0)
    {
        auto currSide = codeUpdate->fetchCurrentBootSide();
        if (currSide == Pside)
        {
            sensorOpState = pSideNum;
        }
    }
    else if (entityInstance == 1)
    {
        auto nextSide = codeUpdate->fetchNextBootSide();
        if (nextSide == Pside)
        {
            sensorOpState = pSideNum;
        }
    }
    else
    {
        sensorOpState = PLDM_SENSOR_UNKNOWN;
    }

    return sensorOpState;
}

int setBootSide(uint16_t entityInstance, uint8_t currState,
                const std::vector<set_effecter_state_field>& stateField,
                CodeUpdate* codeUpdate)
{
    int rc = PLDM_SUCCESS;
    auto side = (stateField[currState].effecter_state == pSideNum) ? "P" : "T";

    if (entityInstance == 0)
    {
        rc = codeUpdate->setCurrentBootSide(side);
    }
    else if (entityInstance == 1)
    {
        rc = codeUpdate->setNextBootSide(side);
    }
    else
    {
        rc = PLDM_PLATFORM_INVALID_STATE_VALUE;
    }
    return rc;
}

template <typename... T>
int executeCmd(const T&... t)
{
    std::stringstream cmd;
    ((cmd << t << " "), ...) << std::endl;
    FILE* pipe = popen(cmd.str().c_str(), "r");
    if (!pipe)
    {
        throw std::runtime_error("popen() failed!");
    }
    int rc = pclose(pipe);
    if (WEXITSTATUS(rc))
    {
        std::cerr << "Error executing: ";
        ((std::cerr << " " << t), ...);
        std::cerr << "\n";
        return -1;
    }

    return 0;
}

int processCodeUpdateLid(const std::string& filePath)
{
    struct LidHeader
    {
        uint16_t magicNumber;
        uint16_t headerVersion;
        uint32_t lidNumber;
        uint32_t lidDate;
        uint16_t lidTime;
        uint16_t lidClass;
        uint32_t lidCrc;
        uint32_t lidSize;
        uint32_t headerSize;
    };
    LidHeader header;

    std::ifstream ifs(filePath, std::ios::in | std::ios::binary);
    if (!ifs)
    {
        error("Failed to opening file '{FILE}' ifstream", "PATH", filePath);
        return PLDM_ERROR;
    }
    ifs.seekg(0);
    ifs.read(reinterpret_cast<char*>(&header), sizeof(header));

    // File size should be the value of lid size minus the header size
    auto fileSize = fs::file_size(filePath);
    fileSize -= htonl(header.headerSize);
    if (fileSize < htonl(header.lidSize))
    {
        // File is not completely written yet
        ifs.close();
        return PLDM_SUCCESS;
    }

    constexpr auto magicNumber = 0x0222;
    if (htons(header.magicNumber) != magicNumber)
    {
        error("Invalid magic number for file '{PATH}'", "PATH", filePath);
        ifs.close();
        return PLDM_ERROR;
    }

    fs::create_directories(imageDirPath);
    fs::create_directories(lidDirPath);

    constexpr auto bmcClass = 0x2000;
    if (htons(header.lidClass) == bmcClass)
    {
        // Skip the header and concatenate the BMC LIDs into a tar file
        std::ofstream ofs(tarImagePath,
                          std::ios::out | std::ios::binary | std::ios::app);
        ifs.seekg(htonl(header.headerSize));
        ofs << ifs.rdbuf();
        ofs.flush();
        ofs.close();
    }
    else
    {
        std::stringstream lidFileName;
        lidFileName << std::hex << htonl(header.lidNumber) << ".lid";
        auto lidNoHeaderPath = fs::path(lidDirPath) / lidFileName.str();
        std::ofstream ofs(lidNoHeaderPath,
                          std::ios::out | std::ios::binary | std::ios::trunc);
        ifs.seekg(htonl(header.headerSize));
        ofs << ifs.rdbuf();
        ofs.flush();
        ofs.close();
    }

    ifs.close();
    fs::remove(filePath);
    return PLDM_SUCCESS;
}

int CodeUpdate::assembleCodeUpdateImage()
{
    pid_t pid = fork();

    if (pid == 0)
    {
        pid_t nextPid = fork();
        if (nextPid == 0)
        {
            // Create the hostfw squashfs image from the LID files without
            // header
            auto rc = executeCmd("/usr/sbin/mksquashfs", lidDirPath.c_str(),
                                 hostfwImagePath.c_str(), "-all-root",
                                 "-no-recovery");
            if (rc < 0)
            {
                error("Error occurred during the mksqusquashfs call");
                setCodeUpdateProgress(false);
                auto sensorId = getFirmwareUpdateSensor();
                sendStateSensorEvent(sensorId, PLDM_STATE_SENSOR_STATE, 0,
                                     uint8_t(CodeUpdateState::FAIL),
                                     uint8_t(CodeUpdateState::START));
                exit(EXIT_FAILURE);
            }

            fs::create_directories(updateDirPath);

            // Extract the BMC tarball content
            rc = executeCmd("/bin/tar", "-xf", tarImagePath.c_str(), "-C",
                            updateDirPath);
            if (rc < 0)
            {
                setCodeUpdateProgress(false);
                auto sensorId = getFirmwareUpdateSensor();
                sendStateSensorEvent(sensorId, PLDM_STATE_SENSOR_STATE, 0,
                                     uint8_t(CodeUpdateState::FAIL),
                                     uint8_t(CodeUpdateState::START));
                exit(EXIT_FAILURE);
            }

            // Add the hostfw image to the directory where the contents were
            // extracted
            fs::copy_file(hostfwImagePath,
                          fs::path(updateDirPath) / hostfwImageName,
                          fs::copy_options::overwrite_existing);

            // Remove the tarball file, then re-generate it with so that the
            // hostfw image becomes part of the tarball
            fs::remove(tarImagePath);
            rc = executeCmd("/bin/tar", "-cf", tarImagePath, ".", "-C",
                            updateDirPath);
            if (rc < 0)
            {
                error("Error occurred during the generation of the tarball");
                setCodeUpdateProgress(false);
                auto sensorId = getFirmwareUpdateSensor();
                sendStateSensorEvent(sensorId, PLDM_STATE_SENSOR_STATE, 0,
                                     uint8_t(CodeUpdateState::FAIL),
                                     uint8_t(CodeUpdateState::START));
                exit(EXIT_FAILURE);
            }

            // Copy the tarball to the update directory to trigger the phosphor
            // software manager to create a version interface
            fs::copy_file(tarImagePath, updateImagePath,
                          fs::copy_options::overwrite_existing);

            // Cleanup
            fs::remove_all(updateDirPath);
            fs::remove_all(lidDirPath);
            fs::remove_all(imageDirPath);

            exit(EXIT_SUCCESS);
        }
        else if (nextPid < 0)
        {
            error("Failure occurred during fork, error number - {ERROR_NUM}",
                  "ERROR_NUM", errno);
            exit(EXIT_FAILURE);
        }

        // Do nothing as parent. When parent exits, child will be reparented
        // under init and be reaped properly.
        exit(0);
    }
    else if (pid > 0)
    {
        int status;
        if (waitpid(pid, &status, 0) < 0)
        {
            error("Error occurred during waitpid, error number - {ERROR_NUM}",
                  "ERROR_NUM", errno);

            return PLDM_ERROR;
        }
        else if (WEXITSTATUS(status) != 0)
        {
            error(
                "Failed to execute the assembling of the image, status is {IMG_STATUS}",
                "IMG_STATUS", status);
            return PLDM_ERROR;
        }
    }
    else
    {
        error("Error occurred during fork, error number - {ERROR_NUM}}",
              "ERROR_NUM", errno);
        return PLDM_ERROR;
    }

    return PLDM_SUCCESS;
}

} // namespace responder
} // namespace pldm