394 lines
10 KiB
C++
394 lines
10 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/utils/port/path.h"
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#include "td/utils/port/detail/PollableFd.h"
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#if TD_WINDOWS
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#include "td/utils/Random.h"
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#endif
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#if TD_PORT_POSIX
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#include <limits.h>
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#include <stdio.h>
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// We don't want warnings from system headers
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#if TD_GCC
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wconversion"
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#endif
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#include <sys/stat.h>
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#if TD_GCC
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#pragma GCC diagnostic pop
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#endif
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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#include <cstdlib>
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namespace td {
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static string temporary_dir;
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Status set_temporary_dir(CSlice dir) {
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string input_dir = dir.str();
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if (!dir.empty() && dir.back() != TD_DIR_SLASH) {
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input_dir += TD_DIR_SLASH;
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}
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TRY_STATUS(mkpath(input_dir, 0750));
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TRY_RESULT(real_dir, realpath(input_dir));
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temporary_dir = std::move(real_dir);
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return Status::OK();
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}
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Status mkpath(CSlice path, int32 mode) {
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Status first_error = Status::OK();
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Status last_error = Status::OK();
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for (size_t i = 1; i < path.size(); i++) {
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if (path[i] == TD_DIR_SLASH) {
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last_error = mkdir(PSLICE() << path.substr(0, i), mode);
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if (last_error.is_error() && first_error.is_ok()) {
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first_error = last_error.clone();
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}
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}
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}
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if (last_error.is_error()) {
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return first_error;
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}
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return Status::OK();
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}
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Status rmrf(CSlice path) {
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return walk_path(path, [](CSlice path, bool is_dir) {
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if (is_dir) {
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return rmdir(path);
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} else {
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return unlink(path);
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}
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});
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}
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#if TD_PORT_POSIX
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Status mkdir(CSlice dir, int32 mode) {
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int mkdir_res = detail::skip_eintr([&] { return ::mkdir(dir.c_str(), static_cast<mode_t>(mode)); });
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if (mkdir_res == 0) {
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return Status::OK();
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}
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auto mkdir_errno = errno;
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if (mkdir_errno == EEXIST) {
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// TODO check that it is a directory
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return Status::OK();
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}
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return Status::PosixError(mkdir_errno, PSLICE() << "Can't create directory \"" << dir << '"');
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}
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Status rename(CSlice from, CSlice to) {
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int rename_res = detail::skip_eintr([&] { return ::rename(from.c_str(), to.c_str()); });
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if (rename_res < 0) {
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return OS_ERROR(PSLICE() << "Can't rename \"" << from << "\" to \"" << to << '\"');
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}
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return Status::OK();
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}
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Result<string> realpath(CSlice slice, bool ignore_access_denied) {
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char full_path[PATH_MAX + 1];
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string res;
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char *err = detail::skip_eintr_cstr([&] { return ::realpath(slice.c_str(), full_path); });
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if (err != full_path) {
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if (ignore_access_denied && (errno == EACCES || errno == EPERM)) {
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res = slice.str();
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} else {
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return OS_ERROR(PSLICE() << "Realpath failed for \"" << slice << '"');
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}
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} else {
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res = full_path;
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}
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if (res.empty()) {
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return Status::Error("Empty path");
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}
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if (!slice.empty() && slice.end()[-1] == TD_DIR_SLASH) {
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if (res.back() != TD_DIR_SLASH) {
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res += TD_DIR_SLASH;
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}
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}
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return res;
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}
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Status chdir(CSlice dir) {
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int chdir_res = detail::skip_eintr([&] { return ::chdir(dir.c_str()); });
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if (chdir_res) {
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return OS_ERROR(PSLICE() << "Can't change directory to \"" << dir << '"');
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}
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return Status::OK();
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}
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Status rmdir(CSlice dir) {
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int rmdir_res = detail::skip_eintr([&] { return ::rmdir(dir.c_str()); });
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if (rmdir_res) {
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return OS_ERROR(PSLICE() << "Can't delete directory \"" << dir << '"');
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}
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return Status::OK();
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}
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Status unlink(CSlice path) {
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int unlink_res = detail::skip_eintr([&] { return ::unlink(path.c_str()); });
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if (unlink_res) {
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return OS_ERROR(PSLICE() << "Can't unlink \"" << path << '"');
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}
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return Status::OK();
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}
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CSlice get_temporary_dir() {
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static bool is_inited = [] {
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if (temporary_dir.empty()) {
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const char *s = std::getenv("TMPDIR");
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if (s != nullptr && s[0] != '\0') {
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temporary_dir = s;
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} else if (P_tmpdir != nullptr && P_tmpdir[0] != '\0') {
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temporary_dir = P_tmpdir;
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} else {
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return false;
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}
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}
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if (temporary_dir.size() > 1 && temporary_dir.back() == TD_DIR_SLASH) {
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temporary_dir.pop_back();
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}
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return true;
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}();
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LOG_IF(FATAL, !is_inited) << "Can't find temporary directory";
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return temporary_dir;
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}
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Result<std::pair<FileFd, string>> mkstemp(CSlice dir) {
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if (dir.empty()) {
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dir = get_temporary_dir();
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if (dir.empty()) {
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return Status::Error("Can't find temporary directory");
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}
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}
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TRY_RESULT(dir_real, realpath(dir));
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CHECK(!dir_real.empty());
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string file_pattern;
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file_pattern.reserve(dir_real.size() + 14);
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file_pattern = dir_real;
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if (file_pattern.back() != TD_DIR_SLASH) {
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file_pattern += TD_DIR_SLASH;
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}
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file_pattern += "tmpXXXXXXXXXX";
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int fd = detail::skip_eintr([&] { return ::mkstemp(&file_pattern[0]); });
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if (fd == -1) {
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return OS_ERROR(PSLICE() << "Can't create temporary file \"" << file_pattern << '"');
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}
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if (close(fd)) {
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return OS_ERROR(PSLICE() << "Can't close temporary file \"" << file_pattern << '"');
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}
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// TODO create file from fd
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TRY_RESULT(file, FileFd::open(file_pattern, FileFd::Write | FileFd::Truncate | FileFd::Append));
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return std::make_pair(std::move(file), std::move(file_pattern));
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}
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Result<string> mkdtemp(CSlice dir, Slice prefix) {
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if (dir.empty()) {
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dir = get_temporary_dir();
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if (dir.empty()) {
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return Status::Error("Can't find temporary directory");
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}
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}
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TRY_RESULT(dir_real, realpath(dir));
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CHECK(!dir_real.empty());
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string dir_pattern;
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dir_pattern.reserve(dir_real.size() + prefix.size() + 7);
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dir_pattern = dir_real;
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if (dir_pattern.back() != TD_DIR_SLASH) {
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dir_pattern += TD_DIR_SLASH;
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}
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dir_pattern.append(prefix.begin(), prefix.size());
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dir_pattern += "XXXXXX";
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char *result = detail::skip_eintr_cstr([&] { return ::mkdtemp(&dir_pattern[0]); });
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if (result == nullptr) {
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return OS_ERROR(PSLICE() << "Can't create temporary directory \"" << dir_pattern << '"');
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}
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return result;
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}
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#endif
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#if TD_PORT_WINDOWS
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Status mkdir(CSlice dir, int32 mode) {
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TRY_RESULT(wdir, to_wstring(dir));
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auto status = CreateDirectoryW(wdir.c_str(), nullptr);
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if (status == 0 && GetLastError() != ERROR_ALREADY_EXISTS) {
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return OS_ERROR(PSLICE() << "Can't create directory \"" << dir << '"');
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}
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return Status::OK();
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}
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Status rename(CSlice from, CSlice to) {
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TRY_RESULT(wfrom, to_wstring(from));
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TRY_RESULT(wto, to_wstring(to));
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auto status = MoveFileExW(wfrom.c_str(), wto.c_str(), MOVEFILE_REPLACE_EXISTING);
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if (status == 0) {
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return OS_ERROR(PSLICE() << "Can't rename \"" << from << "\" to \"" << to << '\"');
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}
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return Status::OK();
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}
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Result<string> realpath(CSlice slice, bool ignore_access_denied) {
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wchar_t buf[MAX_PATH + 1];
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TRY_RESULT(wslice, to_wstring(slice));
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auto status = GetFullPathNameW(wslice.c_str(), MAX_PATH, buf, nullptr);
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string res;
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if (status == 0) {
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if (ignore_access_denied && errno == ERROR_ACCESS_DENIED) {
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res = slice.str();
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} else {
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return OS_ERROR(PSLICE() << "GetFullPathNameW failed for \"" << slice << '"');
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}
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} else {
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TRY_RESULT(t_res, from_wstring(buf));
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res = std::move(t_res);
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}
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if (res.empty()) {
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return Status::Error("Empty path");
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}
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if (!slice.empty() && slice.end()[-1] == TD_DIR_SLASH) {
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if (res.back() != TD_DIR_SLASH) {
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res += TD_DIR_SLASH;
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}
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}
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return res;
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}
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Status chdir(CSlice dir) {
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TRY_RESULT(wdir, to_wstring(dir));
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auto res = SetCurrentDirectoryW(wdir.c_str());
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if (res == 0) {
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return OS_ERROR(PSLICE() << "Can't change directory to \"" << dir << '"');
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}
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return Status::OK();
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}
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Status rmdir(CSlice dir) {
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TRY_RESULT(wdir, to_wstring(dir));
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int status = RemoveDirectoryW(wdir.c_str());
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if (!status) {
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return OS_ERROR(PSLICE() << "Can't delete directory \"" << dir << '"');
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}
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return Status::OK();
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}
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Status unlink(CSlice path) {
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TRY_RESULT(wpath, to_wstring(path));
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int status = DeleteFileW(wpath.c_str());
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if (!status) {
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return OS_ERROR(PSLICE() << "Can't unlink \"" << path << '"');
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}
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return Status::OK();
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}
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CSlice get_temporary_dir() {
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static bool is_inited = [] {
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if (temporary_dir.empty()) {
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wchar_t buf[MAX_PATH + 1];
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if (GetTempPathW(MAX_PATH, buf) == 0) {
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auto error = OS_ERROR("GetTempPathW failed");
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LOG(FATAL) << error;
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}
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auto rs = from_wstring(buf);
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LOG_IF(FATAL, rs.is_error()) << "GetTempPathW failed: " << rs.error();
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temporary_dir = rs.ok();
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}
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if (temporary_dir.size() > 1 && temporary_dir.back() == TD_DIR_SLASH) {
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temporary_dir.pop_back();
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}
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return true;
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}();
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LOG_IF(FATAL, !is_inited) << "Can't find temporary directory";
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return temporary_dir;
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}
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Result<string> mkdtemp(CSlice dir, Slice prefix) {
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if (dir.empty()) {
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dir = get_temporary_dir();
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if (dir.empty()) {
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return Status::Error("Can't find temporary directory");
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}
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}
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TRY_RESULT(dir_real, realpath(dir));
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CHECK(!dir_real.empty());
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string dir_pattern;
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dir_pattern.reserve(dir_real.size() + prefix.size() + 7);
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dir_pattern = dir_real;
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if (dir_pattern.back() != TD_DIR_SLASH) {
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dir_pattern += TD_DIR_SLASH;
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}
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dir_pattern.append(prefix.begin(), prefix.size());
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for (auto iter = 0; iter < 20; iter++) {
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auto path = dir_pattern;
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for (int i = 0; i < 6 + iter / 5; i++) {
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path += static_cast<char>(Random::fast('a', 'z'));
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}
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auto status = mkdir(path);
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if (status.is_ok()) {
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return path;
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}
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}
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return Status::Error(PSLICE() << "Can't create temporary directory \"" << dir_pattern << '"');
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}
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Result<std::pair<FileFd, string>> mkstemp(CSlice dir) {
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if (dir.empty()) {
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dir = get_temporary_dir();
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if (dir.empty()) {
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return Status::Error("Can't find temporary directory");
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}
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}
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TRY_RESULT(dir_real, realpath(dir));
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CHECK(!dir_real.empty());
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string file_pattern;
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file_pattern.reserve(dir_real.size() + 14);
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file_pattern = dir_real;
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if (file_pattern.back() != TD_DIR_SLASH) {
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file_pattern += TD_DIR_SLASH;
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}
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file_pattern += "tmp";
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for (auto iter = 0; iter < 20; iter++) {
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auto path = file_pattern;
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for (int i = 0; i < 6 + iter / 5; i++) {
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path += static_cast<char>(Random::fast('a', 'z'));
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}
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auto r_file = FileFd::open(path, FileFd::Write | FileFd::Read | FileFd::CreateNew);
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if (r_file.is_ok()) {
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return std::make_pair(r_file.move_as_ok(), path);
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}
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}
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return Status::Error(PSLICE() << "Can't create temporary file \"" << file_pattern << '"');
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}
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#endif
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} // namespace td
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