tdlight/tdutils/td/utils/port/path.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/port/path.h"
#include "td/utils/port/config.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/port/detail/PollableFd.h"
#include "td/utils/ScopeGuard.h"
#if TD_PORT_WINDOWS
#include "td/utils/port/wstring_convert.h"
#include "td/utils/Random.h"
#endif
#if TD_PORT_POSIX
#include <dirent.h>
#include <limits.h>
#include <stdio.h>
// We don't want warnings from system headers
#if TD_GCC
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
#include <sys/stat.h>
#if TD_GCC
#pragma GCC diagnostic pop
#endif
#include <sys/types.h>
#include <unistd.h>
#endif
#if TD_DARWIN
#include <sys/syslimits.h>
#endif
#include <cstdlib>
#include <string>
namespace td {
static string temporary_dir;
Status set_temporary_dir(CSlice dir) {
string input_dir = dir.str();
if (!dir.empty() && dir.back() != TD_DIR_SLASH) {
input_dir += TD_DIR_SLASH;
}
TRY_STATUS(mkpath(input_dir, 0750));
TRY_RESULT(real_dir, realpath(input_dir));
temporary_dir = std::move(real_dir);
return Status::OK();
}
Status mkpath(CSlice path, int32 mode) {
Status first_error = Status::OK();
Status last_error = Status::OK();
for (size_t i = 1; i < path.size(); i++) {
if (path[i] == TD_DIR_SLASH) {
last_error = mkdir(PSLICE() << path.substr(0, i), mode);
if (last_error.is_error() && first_error.is_ok()) {
first_error = last_error.clone();
}
}
}
if (last_error.is_error()) {
return first_error;
}
return Status::OK();
}
Status rmrf(CSlice path) {
return walk_path(path, [](CSlice path, WalkPath::Type type) {
switch (type) {
case WalkPath::Type::EnterDir:
break;
case WalkPath::Type::ExitDir:
rmdir(path).ignore();
break;
case WalkPath::Type::NotDir:
unlink(path).ignore();
break;
}
});
}
#if TD_PORT_POSIX
Status mkdir(CSlice dir, int32 mode) {
int mkdir_res = [&] {
int res;
do {
errno = 0; // just in case
res = ::mkdir(dir.c_str(), static_cast<mode_t>(mode));
} while (res < 0 && (errno == EINTR || errno == EAGAIN));
return res;
}();
if (mkdir_res == 0) {
return Status::OK();
}
auto mkdir_errno = errno;
if (mkdir_errno == EEXIST) {
// TODO check that it is a directory
return Status::OK();
}
return Status::PosixError(mkdir_errno, PSLICE() << "Can't create directory \"" << dir << '"');
}
Status rename(CSlice from, CSlice to) {
int rename_res = detail::skip_eintr([&] { return ::rename(from.c_str(), to.c_str()); });
if (rename_res < 0) {
return OS_ERROR(PSLICE() << "Can't rename \"" << from << "\" to \"" << to << '\"');
}
return Status::OK();
}
Result<string> realpath(CSlice slice, bool ignore_access_denied) {
char full_path[PATH_MAX + 1];
string res;
char *err = detail::skip_eintr_cstr([&] { return ::realpath(slice.c_str(), full_path); });
if (err != full_path) {
if (ignore_access_denied && (errno == EACCES || errno == EPERM)) {
res = slice.str();
} else {
return OS_ERROR(PSLICE() << "Realpath failed for \"" << slice << '"');
}
} else {
res = full_path;
}
if (res.empty()) {
return Status::Error("Empty path");
}
if (!slice.empty() && slice.end()[-1] == TD_DIR_SLASH) {
if (res.back() != TD_DIR_SLASH) {
res += TD_DIR_SLASH;
}
}
return res;
}
Status chdir(CSlice dir) {
int chdir_res = detail::skip_eintr([&] { return ::chdir(dir.c_str()); });
if (chdir_res) {
return OS_ERROR(PSLICE() << "Can't change directory to \"" << dir << '"');
}
return Status::OK();
}
Status rmdir(CSlice dir) {
int rmdir_res = detail::skip_eintr([&] { return ::rmdir(dir.c_str()); });
if (rmdir_res) {
return OS_ERROR(PSLICE() << "Can't delete directory \"" << dir << '"');
}
return Status::OK();
}
Status unlink(CSlice path) {
int unlink_res = detail::skip_eintr([&] { return ::unlink(path.c_str()); });
if (unlink_res) {
return OS_ERROR(PSLICE() << "Can't unlink \"" << path << '"');
}
return Status::OK();
}
CSlice get_temporary_dir() {
static bool is_inited = [] {
if (temporary_dir.empty()) {
const char *s = std::getenv("TMPDIR");
if (s != nullptr && s[0] != '\0') {
temporary_dir = s;
} else if (P_tmpdir != nullptr && P_tmpdir[0] != '\0') {
temporary_dir = P_tmpdir;
} else {
return false;
}
}
if (temporary_dir.size() > 1 && temporary_dir.back() == TD_DIR_SLASH) {
temporary_dir.pop_back();
}
return true;
}();
LOG_IF(FATAL, !is_inited) << "Can't find temporary directory";
return temporary_dir;
}
Result<std::pair<FileFd, string>> mkstemp(CSlice dir) {
if (dir.empty()) {
dir = get_temporary_dir();
if (dir.empty()) {
return Status::Error("Can't find temporary directory");
}
}
TRY_RESULT(dir_real, realpath(dir));
CHECK(!dir_real.empty());
string file_pattern;
file_pattern.reserve(dir_real.size() + 14);
file_pattern = dir_real;
if (file_pattern.back() != TD_DIR_SLASH) {
file_pattern += TD_DIR_SLASH;
}
file_pattern += "tmpXXXXXXXXXX";
int fd = detail::skip_eintr([&] { return ::mkstemp(&file_pattern[0]); });
if (fd == -1) {
return OS_ERROR(PSLICE() << "Can't create temporary file \"" << file_pattern << '"');
}
if (close(fd)) {
return OS_ERROR(PSLICE() << "Can't close temporary file \"" << file_pattern << '"');
}
// TODO create file from fd
TRY_RESULT(file, FileFd::open(file_pattern, FileFd::Write | FileFd::Truncate | FileFd::Append));
return std::make_pair(std::move(file), std::move(file_pattern));
}
Result<string> mkdtemp(CSlice dir, Slice prefix) {
if (dir.empty()) {
dir = get_temporary_dir();
if (dir.empty()) {
return Status::Error("Can't find temporary directory");
}
}
TRY_RESULT(dir_real, realpath(dir));
CHECK(!dir_real.empty());
string dir_pattern;
dir_pattern.reserve(dir_real.size() + prefix.size() + 7);
dir_pattern = dir_real;
if (dir_pattern.back() != TD_DIR_SLASH) {
dir_pattern += TD_DIR_SLASH;
}
dir_pattern.append(prefix.begin(), prefix.size());
dir_pattern += "XXXXXX";
char *result = detail::skip_eintr_cstr([&] { return ::mkdtemp(&dir_pattern[0]); });
if (result == nullptr) {
return OS_ERROR(PSLICE() << "Can't create temporary directory \"" << dir_pattern << '"');
}
return result;
}
namespace detail {
using WalkFunction = std::function<WalkPath::Action(CSlice name, WalkPath::Type type)>;
Result<bool> walk_path_dir(string &path, FileFd fd, const WalkFunction &func) TD_WARN_UNUSED_RESULT;
Result<bool> walk_path_dir(string &path, const WalkFunction &func) TD_WARN_UNUSED_RESULT;
Result<bool> walk_path_file(string &path, const WalkFunction &func) TD_WARN_UNUSED_RESULT;
Result<bool> walk_path(string &path, const WalkFunction &func) TD_WARN_UNUSED_RESULT;
Result<bool> walk_path_subdir(string &path, DIR *dir, const WalkFunction &func) {
while (true) {
errno = 0;
auto *entry = readdir(dir);
auto readdir_errno = errno;
if (readdir_errno) {
return Status::PosixError(readdir_errno, "readdir");
}
if (entry == nullptr) {
return true;
}
Slice name = Slice(static_cast<const char *>(entry->d_name));
if (name == "." || name == "..") {
continue;
}
auto size = path.size();
if (path.back() != TD_DIR_SLASH) {
path += TD_DIR_SLASH;
}
path.append(name.begin(), name.size());
SCOPE_EXIT {
path.resize(size);
};
Result<bool> status;
#ifdef DT_DIR
if (entry->d_type == DT_UNKNOWN) {
status = walk_path(path, func);
} else if (entry->d_type == DT_DIR) {
status = walk_path_dir(path, func);
} else if (entry->d_type == DT_REG) {
status = walk_path_file(path, func);
}
#else
#warning "Slow walk_path"
status = walk_path(path, func);
#endif
TRY_RESULT(is_ok, std::move(status));
if (!is_ok) {
return false;
}
}
}
Result<bool> walk_path_dir(string &path, DIR *subdir, const WalkFunction &func) {
SCOPE_EXIT {
closedir(subdir);
};
switch (func(path, WalkPath::Type::EnterDir)) {
case WalkPath::Action::Abort:
return false;
case WalkPath::Action::SkipDir:
return true;
case WalkPath::Action::Continue:
break;
}
TRY_RESULT(is_ok, walk_path_subdir(path, subdir, func));
if (!is_ok) {
return false;
}
switch (func(path, WalkPath::Type::ExitDir)) {
case WalkPath::Action::Abort:
return false;
case WalkPath::Action::SkipDir:
case WalkPath::Action::Continue:
break;
}
return true;
}
Result<bool> walk_path_dir(string &path, FileFd fd, const WalkFunction &func) {
auto native_fd = fd.move_as_native_fd();
auto *subdir = fdopendir(native_fd.fd());
if (subdir == nullptr) {
return OS_ERROR("fdopendir");
}
native_fd.release();
return walk_path_dir(path, subdir, func);
}
Result<bool> walk_path_dir(string &path, const WalkFunction &func) {
auto *subdir = opendir(path.c_str());
if (subdir == nullptr) {
return OS_ERROR(PSLICE() << tag("opendir", path));
}
return walk_path_dir(path, subdir, func);
}
Result<bool> walk_path_file(string &path, const WalkFunction &func) {
switch (func(path, WalkPath::Type::NotDir)) {
case WalkPath::Action::Abort:
return false;
case WalkPath::Action::SkipDir:
case WalkPath::Action::Continue:
break;
}
return true;
}
Result<bool> walk_path(string &path, const WalkFunction &func) {
TRY_RESULT(fd, FileFd::open(path, FileFd::Read));
auto stat = fd.stat();
bool is_dir = stat.is_dir_;
bool is_reg = stat.is_reg_;
if (is_dir) {
return walk_path_dir(path, std::move(fd), func);
}
fd.close();
if (is_reg) {
return walk_path_file(path, func);
}
return true;
}
} // namespace detail
Status WalkPath::do_run(CSlice path, const detail::WalkFunction &func) {
string curr_path;
curr_path.reserve(PATH_MAX + 10);
curr_path = path.c_str();
TRY_STATUS(detail::walk_path(curr_path, func));
return Status::OK();
}
#endif
#if TD_PORT_WINDOWS
Status mkdir(CSlice dir, int32 mode) {
TRY_RESULT(wdir, to_wstring(dir));
auto status = CreateDirectoryW(wdir.c_str(), nullptr);
if (status == 0 && GetLastError() != ERROR_ALREADY_EXISTS) {
return OS_ERROR(PSLICE() << "Can't create directory \"" << dir << '"');
}
return Status::OK();
}
Status rename(CSlice from, CSlice to) {
TRY_RESULT(wfrom, to_wstring(from));
TRY_RESULT(wto, to_wstring(to));
auto status = MoveFileExW(wfrom.c_str(), wto.c_str(), MOVEFILE_REPLACE_EXISTING);
if (status == 0) {
return OS_ERROR(PSLICE() << "Can't rename \"" << from << "\" to \"" << to << '\"');
}
return Status::OK();
}
Result<string> realpath(CSlice slice, bool ignore_access_denied) {
wchar_t buf[MAX_PATH + 1];
TRY_RESULT(wslice, to_wstring(slice));
auto status = GetFullPathNameW(wslice.c_str(), MAX_PATH, buf, nullptr);
string res;
if (status == 0) {
if (ignore_access_denied && errno == ERROR_ACCESS_DENIED) {
res = slice.str();
} else {
return OS_ERROR(PSLICE() << "GetFullPathNameW failed for \"" << slice << '"');
}
} else {
TRY_RESULT(t_res, from_wstring(buf));
res = std::move(t_res);
}
if (res.empty()) {
return Status::Error("Empty path");
}
if (!slice.empty() && slice.end()[-1] == TD_DIR_SLASH) {
if (res.back() != TD_DIR_SLASH) {
res += TD_DIR_SLASH;
}
}
return res;
}
Status chdir(CSlice dir) {
TRY_RESULT(wdir, to_wstring(dir));
auto res = SetCurrentDirectoryW(wdir.c_str());
if (res == 0) {
return OS_ERROR(PSLICE() << "Can't change directory to \"" << dir << '"');
}
return Status::OK();
}
Status rmdir(CSlice dir) {
TRY_RESULT(wdir, to_wstring(dir));
int status = RemoveDirectoryW(wdir.c_str());
if (!status) {
return OS_ERROR(PSLICE() << "Can't delete directory \"" << dir << '"');
}
return Status::OK();
}
Status unlink(CSlice path) {
TRY_RESULT(wpath, to_wstring(path));
int status = DeleteFileW(wpath.c_str());
if (!status) {
return OS_ERROR(PSLICE() << "Can't unlink \"" << path << '"');
}
return Status::OK();
}
CSlice get_temporary_dir() {
static bool is_inited = [] {
if (temporary_dir.empty()) {
wchar_t buf[MAX_PATH + 1];
if (GetTempPathW(MAX_PATH, buf) == 0) {
auto error = OS_ERROR("GetTempPathW failed");
LOG(FATAL) << error;
}
auto rs = from_wstring(buf);
LOG_IF(FATAL, rs.is_error()) << "GetTempPathW failed: " << rs.error();
temporary_dir = rs.ok();
}
if (temporary_dir.size() > 1 && temporary_dir.back() == TD_DIR_SLASH) {
temporary_dir.pop_back();
}
return true;
}();
LOG_IF(FATAL, !is_inited) << "Can't find temporary directory";
return temporary_dir;
}
Result<string> mkdtemp(CSlice dir, Slice prefix) {
if (dir.empty()) {
dir = get_temporary_dir();
if (dir.empty()) {
return Status::Error("Can't find temporary directory");
}
}
TRY_RESULT(dir_real, realpath(dir));
CHECK(!dir_real.empty());
string dir_pattern;
dir_pattern.reserve(dir_real.size() + prefix.size() + 7);
dir_pattern = dir_real;
if (dir_pattern.back() != TD_DIR_SLASH) {
dir_pattern += TD_DIR_SLASH;
}
dir_pattern.append(prefix.begin(), prefix.size());
for (auto iter = 0; iter < 20; iter++) {
auto path = dir_pattern;
for (int i = 0; i < 6 + iter / 5; i++) {
path += static_cast<char>(Random::fast('a', 'z'));
}
auto status = mkdir(path);
if (status.is_ok()) {
return path;
}
}
return Status::Error(PSLICE() << "Can't create temporary directory \"" << dir_pattern << '"');
}
Result<std::pair<FileFd, string>> mkstemp(CSlice dir) {
if (dir.empty()) {
dir = get_temporary_dir();
if (dir.empty()) {
return Status::Error("Can't find temporary directory");
}
}
TRY_RESULT(dir_real, realpath(dir));
CHECK(!dir_real.empty());
string file_pattern;
file_pattern.reserve(dir_real.size() + 14);
file_pattern = dir_real;
if (file_pattern.back() != TD_DIR_SLASH) {
file_pattern += TD_DIR_SLASH;
}
file_pattern += "tmp";
for (auto iter = 0; iter < 20; iter++) {
auto path = file_pattern;
for (int i = 0; i < 6 + iter / 5; i++) {
path += static_cast<char>(Random::fast('a', 'z'));
}
auto r_file = FileFd::open(path, FileFd::Write | FileFd::Read | FileFd::CreateNew);
if (r_file.is_ok()) {
return std::make_pair(r_file.move_as_ok(), path);
}
}
return Status::Error(PSLICE() << "Can't create temporary file \"" << file_pattern << '"');
}
static Result<bool> walk_path_dir(const std::wstring &dir_name,
const std::function<WalkPath::Action(CSlice name, WalkPath::Type type)> &func) {
std::wstring name = dir_name + L"\\*";
WIN32_FIND_DATA file_data;
auto handle = FindFirstFileExW(name.c_str(), FindExInfoStandard, &file_data, FindExSearchNameMatch, nullptr, 0);
if (handle == INVALID_HANDLE_VALUE) {
return OS_ERROR(PSLICE() << "FindFirstFileEx" << tag("name", from_wstring(name).ok()));
}
SCOPE_EXIT {
FindClose(handle);
};
TRY_RESULT(dir_entry_name, from_wstring(dir_name));
switch (func(dir_entry_name, WalkPath::Type::EnterDir)) {
case WalkPath::Action::Abort:
return false;
case WalkPath::Action::SkipDir:
return true;
case WalkPath::Action::Continue:
break;
}
while (true) {
auto full_name = dir_name + L"\\" + file_data.cFileName;
TRY_RESULT(entry_name, from_wstring(full_name));
if (file_data.cFileName[0] != '.') {
if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
TRY_RESULT(is_ok, walk_path_dir(full_name, func));
if (!is_ok) {
return false;
}
} else {
switch (func(entry_name, WalkPath::Type::NotDir)) {
case WalkPath::Action::Abort:
return false;
case WalkPath::Action::SkipDir:
case WalkPath::Action::Continue:
break;
}
}
}
auto status = FindNextFileW(handle, &file_data);
if (status == 0) {
auto last_error = GetLastError();
if (last_error == ERROR_NO_MORE_FILES) {
break;
}
return OS_ERROR("FindNextFileW");
}
}
switch (func(dir_entry_name, WalkPath::Type::ExitDir)) {
case WalkPath::Action::Abort:
return false;
case WalkPath::Action::SkipDir:
case WalkPath::Action::Continue:
break;
}
return true;
}
Status WalkPath::do_run(CSlice path, const std::function<Action(CSlice name, Type)> &func) {
TRY_RESULT(wpath, to_wstring(path));
Slice path_slice = path;
while (!path_slice.empty() && (path_slice.back() == '/' || path_slice.back() == '\\')) {
path_slice.remove_suffix(1);
wpath.pop_back();
}
TRY_STATUS(walk_path_dir(wpath, func));
return Status::OK();
}
#endif
} // namespace td