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/*
* Copyright (C) 2021 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.
*/
#include "odr_fs_utils.h"
#include <dirent.h>
#include <ftw.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <unistd.h>
#include <iosfwd>
#include <memory>
#include <ostream>
#include <queue>
#include <string>
#include <string_view>
#include <type_traits>
#include <vector>
#include <android-base/logging.h>
#include <android-base/macros.h>
#include <android-base/strings.h>
#include <base/os.h>
namespace art {
namespace odrefresh {
// Callback for use with nftw(3) to assist with clearing files and sub-directories.
// This method removes files and directories below the top-level directory passed to nftw().
static int NftwCleanUpCallback(const char* fpath,
const struct stat* sb ATTRIBUTE_UNUSED,
int typeflag,
struct FTW* ftwbuf) {
switch (typeflag) {
case FTW_F:
return unlink(fpath);
case FTW_DP:
return (ftwbuf->level == 0) ? 0 : rmdir(fpath);
default:
return -1;
}
}
WARN_UNUSED bool RemoveDirectory(const std::string& dir_path) {
if (!OS::DirectoryExists(dir_path.c_str())) {
return true;
}
static constexpr int kMaxDescriptors = 4; // Limit the need for nftw() to re-open descriptors.
if (nftw(dir_path.c_str(), NftwCleanUpCallback, kMaxDescriptors, FTW_DEPTH | FTW_MOUNT) != 0) {
LOG(ERROR) << "Failed to clean-up '" << dir_path << "'";
return false;
}
if (rmdir(dir_path.c_str()) != 0) {
// It's possible that we are not able to remove the directory itself. For example, when
// odrefresh is running in CompOS, the staging dir is prepared beforehand passed to the VM as an
// FD. In this case, just log and ignore the error. It's okay to keep the directory.
LOG(WARNING) << "Failed to delete '" << dir_path << "'";
}
return true;
}
WARN_UNUSED bool EnsureDirectoryExists(const std::string& absolute_path) {
if (absolute_path.empty() || absolute_path[0] != '/') {
LOG(ERROR) << "Path not absolute '" << absolute_path << "'";
return false;
}
std::string path;
for (const std::string& directory : android::base::Split(absolute_path, "/")) {
path.append("/").append(directory);
if (!OS::DirectoryExists(path.c_str())) {
static constexpr mode_t kDirectoryMode = S_IRWXU | S_IRGRP | S_IXGRP| S_IROTH | S_IXOTH;
if (mkdir(path.c_str(), kDirectoryMode) != 0) {
PLOG(ERROR) << "Could not create directory: " << path;
return false;
}
}
}
return true;
}
bool GetFreeSpace(const std::string& path, uint64_t* bytes) {
struct statvfs sv;
if (statvfs(path.c_str(), &sv) != 0) {
PLOG(ERROR) << "statvfs '" << path << "'";
return false;
}
*bytes = sv.f_bfree * sv.f_bsize;
return true;
}
bool GetUsedSpace(const std::string& path, uint64_t* bytes) {
static constexpr std::string_view kCurrentDirectory{"."};
static constexpr std::string_view kParentDirectory{".."};
static constexpr size_t kBytesPerBlock = 512; // see manual page for stat(2).
uint64_t file_bytes = 0;
std::queue<std::string> unvisited;
unvisited.push(path);
while (!unvisited.empty()) {
std::string current = unvisited.front();
unvisited.pop();
std::unique_ptr<DIR, int (*)(DIR*)> dir(opendir(current.c_str()), closedir);
if (!dir) {
continue;
}
for (auto entity = readdir(dir.get()); entity != nullptr; entity = readdir(dir.get())) {
std::string_view name{entity->d_name};
if (name == kCurrentDirectory || name == kParentDirectory) {
continue;
}
std::string entity_name = current + "/" + entity->d_name;
if (entity->d_type == DT_DIR) {
unvisited.push(entity_name.c_str());
} else if (entity->d_type == DT_REG) {
struct stat sb;
if (stat(entity_name.c_str(), &sb) != 0) {
PLOG(ERROR) << "Failed to stat() file " << entity_name;
continue;
}
file_bytes += sb.st_blocks * kBytesPerBlock;
}
}
}
*bytes = file_bytes;
return true;
}
} // namespace odrefresh
} // namespace art