1 /** 2 * Copyright © 2020 IBM Corporation 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #include "config.h" 17 18 #include "util.hpp" 19 20 namespace phosphor::logging::util 21 { 22 23 std::optional<std::string> getOSReleaseValue(const std::string& key) 24 { 25 std::ifstream versionFile{BMC_VERSION_FILE}; 26 std::string line; 27 std::string keyPattern{key + '='}; 28 29 while (std::getline(versionFile, line)) 30 { 31 if (line.substr(0, keyPattern.size()).find(keyPattern) != 32 std::string::npos) 33 { 34 // If the value isn't surrounded by quotes, then pos will be 35 // npos + 1 = 0, and the 2nd arg to substr() will be npos 36 // which means get the rest of the string. 37 auto value = line.substr(keyPattern.size()); 38 std::size_t pos = value.find_first_of('"') + 1; 39 return value.substr(pos, value.find_last_of('"') - pos); 40 } 41 } 42 43 return std::nullopt; 44 } 45 46 } // namespace phosphor::logging::util 47