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#include "config.h"
#include <experimental/filesystem>
#include <cereal/archives/json.hpp>
#include <fstream>
#include <unistd.h>
#include "serialize.hpp"
#include <sdbusplus/server.hpp>
#include <phosphor-logging/log.hpp>
#include <chrono>
namespace phosphor
{
namespace software
{
namespace updater
{
namespace fs = std::experimental::filesystem;
using namespace phosphor::logging;
using namespace std::chrono_literals;
void storeToFile(std::string versionId, uint8_t priority)
{
auto bus = sdbusplus::bus::new_default();
if (!fs::is_directory(PERSIST_DIR))
{
fs::create_directories(PERSIST_DIR);
}
std::string path = PERSIST_DIR + versionId;
std::ofstream os(path.c_str());
cereal::JSONOutputArchive oarchive(os);
oarchive(cereal::make_nvp("priority", priority));
std::string serviceFile = "obmc-flash-bmc-setenv@" + versionId + "\\x3d" +
std::to_string(priority) + ".service";
auto method = bus.new_method_call(SYSTEMD_BUSNAME, SYSTEMD_PATH,
SYSTEMD_INTERFACE, "StartUnit");
method.append(serviceFile, "replace");
bus.call_noreply(method);
// On average it takes 1-2 seconds for the service to complete.
// Therefore timeout is set to 3x average completion time.
waitForServiceFile(serviceFile, 6);
}
bool restoreFromFile(std::string versionId, uint8_t& priority)
{
std::string path = PERSIST_DIR + versionId;
if (fs::exists(path))
{
std::ifstream is(path.c_str(), std::ios::in);
try
{
cereal::JSONInputArchive iarchive(is);
iarchive(cereal::make_nvp("priority", priority));
return true;
}
catch (cereal::RapidJSONException& e)
{
fs::remove(path);
}
}
// Find the mtd device "u-boot-env" to retrieve the environment variables
std::ifstream mtdDevices("/proc/mtd");
std::string device, devicePath;
try
{
while (std::getline(mtdDevices, device))
{
if (device.find("u-boot-env") != std::string::npos)
{
devicePath = "/dev/" + device.substr(0, device.find(':'));
break;
}
}
if (!devicePath.empty())
{
std::ifstream input(devicePath.c_str());
std::string envVars;
std::getline(input, envVars);
std::string versionVar = versionId + "=";
auto varPosition = envVars.find(versionVar);
if (varPosition != std::string::npos)
{
// Grab the environment variable for this versionId. These
// variables follow the format "versionId=priority\0"
auto var = envVars.substr(varPosition);
priority = std::stoi(var.substr(versionVar.length()));
return true;
}
}
}
catch (const std::exception& e)
{
}
return false;
}
void removeFile(std::string versionId)
{
std::string path = PERSIST_DIR + versionId;
if (fs::exists(path))
{
fs::remove(path);
}
}
void waitForServiceFile(const std::string& serviceFile, int timeout)
{
auto bus = sdbusplus::bus::new_default();
std::time_t start = time(0);
std::time_t end = time(0);
while (end - start < timeout)
{
auto method = bus.new_method_call(SYSTEMD_BUSNAME, SYSTEMD_PATH,
SYSTEMD_INTERFACE, "GetUnit");
method.append(serviceFile);
auto result = bus.call(method);
// "GetUnit" returns the unit object path for a unit name.
// If the unit is not found because it hasn't been loaded yet,
// or in this case because it has finished and exited, the call
// will fail.
if (result.is_method_error())
{
return;
}
std::this_thread::sleep_for(1s);
end = time(0);
}
log<level::ERR>("Service file timed out!",
entry("FILENAME=%s", serviceFile.c_str()));
}
} // namespace phosphor
} // namespace software
} // namespace openpower
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