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/*
// Copyright (c) 2019 Intel Corporation
//
// 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 "u-boot-env-mgr.hpp"
#include <phosphor-logging/log.hpp>
#include <phosphor-logging/elog-errors.hpp>
#include <boost/process/child.hpp>
#include <boost/process/io.hpp>
#include <vector>
#include <unordered_map>
#include <xyz/openbmc_project/Common/error.hpp>
template <typename... ArgTypes>
static std::vector<std::string> executeCmd(const char* path,
ArgTypes&&... tArgs)
{
std::vector<std::string> stdOutput;
boost::process::ipstream stdOutStream;
boost::process::child execProg(path, const_cast<char*>(tArgs)...,
boost::process::std_out > stdOutStream);
std::string stdOutLine;
while (stdOutStream && std::getline(stdOutStream, stdOutLine) &&
!stdOutLine.empty())
{
stdOutput.emplace_back(stdOutLine);
}
execProg.wait();
int retCode = execProg.exit_code();
if (retCode)
{
phosphor::logging::log<phosphor::logging::level::ERR>(
"Command execution failed",
phosphor::logging::entry("PATH=%d", path),
phosphor::logging::entry("RETURN_CODE:%d", retCode));
phosphor::logging::elog<
sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure>();
}
return stdOutput;
}
UBootEnvMgr::UBootEnvMgr(boost::asio::io_service& io_,
sdbusplus::asio::object_server& srv_,
std::shared_ptr<sdbusplus::asio::connection>& conn_) :
io(io_),
server(srv_), conn(conn_)
{
iface = server.add_interface(uBootEnvMgrPath, uBootEnvMgrIface);
iface->register_method("ReadAll", [this]() { return readAllVariable(); });
iface->register_method("Read", [this](const std::string& key) {
std::unordered_map<std::string, std::string> env = readAllVariable();
auto it = env.find(key);
if (it != env.end())
{
return it->second;
}
return std::string{};
});
iface->register_method(
"Write", [this](const std::string& key, const std::string& value) {
writeVariable(key, value);
});
iface->initialize(true);
}
std::unordered_map<std::string, std::string> UBootEnvMgr::readAllVariable()
{
std::unordered_map<std::string, std::string> env;
std::vector<std::string> output = executeCmd("/sbin/fw_printenv");
for (const auto& entry : output)
{
size_t pos = entry.find("=");
if (pos + 1 >= entry.size())
{
phosphor::logging::log<phosphor::logging::level::ERR>(
"Invalid U-Boot environment",
phosphor::logging::entry("ENTRY=%s", entry.c_str()));
continue;
}
// using string instead of string_view for null termination
std::string key = entry.substr(0, pos);
std::string value = entry.substr(pos + 1);
env.emplace(key, value);
}
return env;
}
void UBootEnvMgr::writeVariable(const std::string& key,
const std::string& value)
{
executeCmd("/sbin/fw_setenv", key.c_str(), value.c_str());
return;
}
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