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140 lines
4.2 KiB
140 lines
4.2 KiB
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "odr_fs_utils.h"
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#include <dirent.h>
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#include <ftw.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/statvfs.h>
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#include <unistd.h>
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#include <iosfwd>
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#include <memory>
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#include <ostream>
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#include <queue>
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#include <string>
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#include <string_view>
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#include <type_traits>
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#include <vector>
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#include <android-base/logging.h>
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#include <android-base/macros.h>
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#include <android-base/strings.h>
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#include <base/os.h>
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namespace art {
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namespace odrefresh {
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// Callback for use with nftw(3) to assist with clearing files and sub-directories.
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// This method removes files and directories below the top-level directory passed to nftw().
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static int NftwCleanUpCallback(const char* fpath,
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const struct stat* sb ATTRIBUTE_UNUSED,
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int typeflag,
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struct FTW* ftwbuf) {
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switch (typeflag) {
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case FTW_F:
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return unlink(fpath);
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case FTW_DP:
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return (ftwbuf->level == 0) ? 0 : rmdir(fpath);
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default:
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return -1;
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}
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}
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WARN_UNUSED bool CleanDirectory(const std::string& dir_path) {
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if (!OS::DirectoryExists(dir_path.c_str())) {
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return true;
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}
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static constexpr int kMaxDescriptors = 4; // Limit the need for nftw() to re-open descriptors.
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if (nftw(dir_path.c_str(), NftwCleanUpCallback, kMaxDescriptors, FTW_DEPTH | FTW_MOUNT) != 0) {
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LOG(ERROR) << "Failed to clean-up '" << dir_path << "'";
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return false;
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}
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return true;
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}
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WARN_UNUSED bool EnsureDirectoryExists(const std::string& absolute_path) {
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if (absolute_path.empty() || absolute_path[0] != '/') {
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LOG(ERROR) << "Path not absolute '" << absolute_path << "'";
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return false;
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}
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std::string path;
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for (const std::string& directory : android::base::Split(absolute_path, "/")) {
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path.append("/").append(directory);
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if (!OS::DirectoryExists(path.c_str())) {
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static constexpr mode_t kDirectoryMode = S_IRWXU | S_IRGRP | S_IXGRP| S_IROTH | S_IXOTH;
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if (mkdir(path.c_str(), kDirectoryMode) != 0) {
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PLOG(ERROR) << "Could not create directory: " << path;
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return false;
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}
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}
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}
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return true;
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}
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bool GetFreeSpace(const std::string& path, uint64_t* bytes) {
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struct statvfs sv;
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if (statvfs(path.c_str(), &sv) != 0) {
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PLOG(ERROR) << "statvfs '" << path << "'";
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return false;
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}
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*bytes = sv.f_bfree * sv.f_bsize;
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return true;
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}
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bool GetUsedSpace(const std::string& path, uint64_t* bytes) {
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static constexpr std::string_view kCurrentDirectory{"."};
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static constexpr std::string_view kParentDirectory{".."};
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static constexpr size_t kBytesPerBlock = 512; // see manual page for stat(2).
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uint64_t file_bytes = 0;
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std::queue<std::string> unvisited;
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unvisited.push(path);
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while (!unvisited.empty()) {
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std::string current = unvisited.front();
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unvisited.pop();
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std::unique_ptr<DIR, int (*)(DIR*)> dir(opendir(current.c_str()), closedir);
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if (!dir) {
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continue;
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}
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for (auto entity = readdir(dir.get()); entity != nullptr; entity = readdir(dir.get())) {
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std::string_view name{entity->d_name};
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if (name == kCurrentDirectory || name == kParentDirectory) {
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continue;
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}
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std::string entity_name = current + "/" + entity->d_name;
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if (entity->d_type == DT_DIR) {
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unvisited.push(entity_name.c_str());
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} else if (entity->d_type == DT_REG) {
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struct stat sb;
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if (stat(entity_name.c_str(), &sb) != 0) {
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PLOG(ERROR) << "Failed to stat() file " << entity_name;
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continue;
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}
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file_bytes += sb.st_blocks * kBytesPerBlock;
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}
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}
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}
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*bytes = file_bytes;
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return true;
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}
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} // namespace odrefresh
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} // namespace art
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