1 // 2 // Copyright (C) 2025 The Android Open Source Project 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 17 #pragma once 18 19 #include <android-base/result.h> 20 #include <fcntl.h> 21 #include <sys/stat.h> 22 23 #include <functional> 24 #include <string> 25 #include <vector> 26 27 struct Entry { 28 // file mode 29 mode_t mode; 30 31 // path to this entry. 32 // - each entry should start with './' 33 // - directory entry should end with '/' 34 std::string path; 35 36 std::string security_context; 37 }; 38 39 // Generic lister 40 template <typename ReadEntry, typename ReadDir> List(ReadEntry read_entry,ReadDir read_dir)41android::base::Result<std::vector<Entry>> List(ReadEntry read_entry, 42 ReadDir read_dir) { 43 namespace fs = std::filesystem; 44 using namespace android::base; 45 46 std::vector<Entry> entries; 47 48 // Recursive visitor 49 std::function<Result<void>(const fs::path& path)> visit = 50 [&](const fs::path& path) -> Result<void> { 51 auto entry = OR_RETURN(read_entry(path)); 52 entries.push_back(entry); 53 54 if (S_ISDIR(entry.mode)) { 55 auto names = OR_RETURN(read_dir(path)); 56 std::ranges::sort(names); 57 for (auto name : names) { 58 // Skip . and .. 59 if (name == "." || name == "..") continue; 60 OR_RETURN(visit(path / name)); 61 } 62 } 63 return {}; 64 }; 65 66 // Visit each path entry recursively starting from root 67 OR_RETURN(visit(".")); 68 69 return entries; 70 }