| /* |
| * 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. |
| */ |
| |
| #define LOG_TAG "derive_sdk" |
| |
| #include <algorithm> |
| #include <dirent.h> |
| #include <iostream> |
| #include <sys/stat.h> |
| #include <vector> |
| |
| #include <android-base/file.h> |
| #include <android-base/logging.h> |
| #include <android-base/properties.h> |
| |
| #include "frameworks/base/apex/sdkext/derive_sdk/sdk.pb.h" |
| |
| using com::android::sdkext::proto::SdkVersion; |
| |
| int main(int, char**) { |
| std::unique_ptr<DIR, decltype(&closedir)> apex(opendir("/apex"), closedir); |
| if (!apex) { |
| LOG(ERROR) << "Could not read /apex"; |
| return EXIT_FAILURE; |
| } |
| struct dirent* de; |
| std::vector<std::string> paths; |
| while ((de = readdir(apex.get()))) { |
| std::string name = de->d_name; |
| if (name[0] == '.' || name.find('@') != std::string::npos) { |
| // Skip <name>@<ver> dirs, as they are bind-mounted to <name> |
| continue; |
| } |
| std::string path = "/apex/" + name + "/etc/sdkinfo.binarypb"; |
| struct stat statbuf; |
| if (stat(path.c_str(), &statbuf) == 0) { |
| paths.push_back(path); |
| } |
| } |
| |
| std::vector<int> versions; |
| for (const auto& path : paths) { |
| std::string contents; |
| if (!android::base::ReadFileToString(path, &contents, true)) { |
| LOG(ERROR) << "failed to read " << path; |
| continue; |
| } |
| SdkVersion sdk_version; |
| if (!sdk_version.ParseFromString(contents)) { |
| LOG(ERROR) << "failed to parse " << path; |
| continue; |
| } |
| versions.push_back(sdk_version.version()); |
| } |
| auto itr = std::min_element(versions.begin(), versions.end()); |
| std::string prop_value = itr == versions.end() ? "0" : std::to_string(*itr); |
| |
| if (!android::base::SetProperty("ro.build.version.extensions.r", prop_value)) { |
| LOG(ERROR) << "failed to set sdk_info prop"; |
| return EXIT_FAILURE; |
| } |
| |
| return EXIT_SUCCESS; |
| } |