Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 1 | //===--------------------- filesystem/ops.cpp -----------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #include "experimental/filesystem" |
| 11 | #include "iterator" |
| 12 | #include "fstream" |
| 13 | #include "type_traits" |
| 14 | #include "random" /* for unique_path */ |
| 15 | #include "cstdlib" |
| 16 | #include "climits" |
| 17 | |
| 18 | #include <unistd.h> |
| 19 | #include <sys/stat.h> |
| 20 | #include <sys/statvfs.h> |
| 21 | #include <fcntl.h> /* values for fchmodat */ |
Eric Fiselier | 2730c25 | 2016-06-18 19:11:40 +0000 | [diff] [blame] | 22 | #if !defined(UTIME_OMIT) |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 23 | #include <sys/time.h> // for ::utimes as used in __last_write_time |
| 24 | #endif |
| 25 | |
| 26 | _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_FILESYSTEM |
| 27 | |
| 28 | filesystem_error::~filesystem_error() {} |
| 29 | |
| 30 | |
| 31 | // POSIX HELPERS |
| 32 | |
| 33 | namespace detail { namespace { |
| 34 | |
| 35 | using value_type = path::value_type; |
| 36 | using string_type = path::string_type; |
| 37 | |
| 38 | |
| 39 | |
| 40 | inline std::error_code capture_errno() { |
| 41 | _LIBCPP_ASSERT(errno, "Expected errno to be non-zero"); |
| 42 | std::error_code m_ec(errno, std::generic_category()); |
| 43 | return m_ec; |
| 44 | } |
| 45 | |
| 46 | void set_or_throw(std::error_code const& m_ec, std::error_code* ec, |
| 47 | const char* msg, path const& p = {}, path const& p2 = {}) |
| 48 | { |
| 49 | if (ec) { |
| 50 | *ec = m_ec; |
| 51 | } else { |
| 52 | string msg_s("std::experimental::filesystem::"); |
| 53 | msg_s += msg; |
| 54 | __libcpp_throw(filesystem_error(msg_s, p, p2, m_ec)); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | void set_or_throw(std::error_code* ec, const char* msg, |
| 59 | path const& p = {}, path const& p2 = {}) |
| 60 | { |
| 61 | return set_or_throw(capture_errno(), ec, msg, p, p2); |
| 62 | } |
| 63 | |
| 64 | perms posix_get_perms(const struct ::stat & st) noexcept { |
| 65 | return static_cast<perms>(st.st_mode) & perms::mask; |
| 66 | } |
| 67 | |
| 68 | ::mode_t posix_convert_perms(perms prms) { |
| 69 | return static_cast< ::mode_t>(prms & perms::mask); |
| 70 | } |
| 71 | |
| 72 | file_status create_file_status(std::error_code& m_ec, path const& p, |
| 73 | struct ::stat& path_stat, |
| 74 | std::error_code* ec) |
| 75 | { |
| 76 | if (ec) *ec = m_ec; |
| 77 | if (m_ec && (m_ec.value() == ENOENT || m_ec.value() == ENOTDIR)) { |
| 78 | return file_status(file_type::not_found); |
| 79 | } |
| 80 | else if (m_ec) { |
| 81 | set_or_throw(m_ec, ec, "posix_stat", p); |
| 82 | return file_status(file_type::none); |
| 83 | } |
| 84 | // else |
| 85 | |
| 86 | file_status fs_tmp; |
| 87 | auto const mode = path_stat.st_mode; |
| 88 | if (S_ISLNK(mode)) fs_tmp.type(file_type::symlink); |
| 89 | else if (S_ISREG(mode)) fs_tmp.type(file_type::regular); |
| 90 | else if (S_ISDIR(mode)) fs_tmp.type(file_type::directory); |
| 91 | else if (S_ISBLK(mode)) fs_tmp.type(file_type::block); |
| 92 | else if (S_ISCHR(mode)) fs_tmp.type(file_type::character); |
| 93 | else if (S_ISFIFO(mode)) fs_tmp.type(file_type::fifo); |
| 94 | else if (S_ISSOCK(mode)) fs_tmp.type(file_type::socket); |
| 95 | else fs_tmp.type(file_type::unknown); |
| 96 | |
| 97 | fs_tmp.permissions(detail::posix_get_perms(path_stat)); |
| 98 | return fs_tmp; |
| 99 | } |
| 100 | |
| 101 | file_status posix_stat(path const & p, struct ::stat& path_stat, |
| 102 | std::error_code* ec) |
| 103 | { |
| 104 | std::error_code m_ec; |
| 105 | if (::stat(p.c_str(), &path_stat) == -1) |
| 106 | m_ec = detail::capture_errno(); |
| 107 | return create_file_status(m_ec, p, path_stat, ec); |
| 108 | } |
| 109 | |
| 110 | file_status posix_stat(path const & p, std::error_code* ec) { |
| 111 | struct ::stat path_stat; |
| 112 | return posix_stat(p, path_stat, ec); |
| 113 | } |
| 114 | |
| 115 | file_status posix_lstat(path const & p, struct ::stat & path_stat, |
| 116 | std::error_code* ec) |
| 117 | { |
| 118 | std::error_code m_ec; |
| 119 | if (::lstat(p.c_str(), &path_stat) == -1) |
| 120 | m_ec = detail::capture_errno(); |
| 121 | return create_file_status(m_ec, p, path_stat, ec); |
| 122 | } |
| 123 | |
| 124 | file_status posix_lstat(path const & p, std::error_code* ec) { |
| 125 | struct ::stat path_stat; |
| 126 | return posix_lstat(p, path_stat, ec); |
| 127 | } |
| 128 | |
| 129 | bool stat_equivalent(struct ::stat& st1, struct ::stat& st2) { |
| 130 | return (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino); |
| 131 | } |
| 132 | |
| 133 | // DETAIL::MISC |
| 134 | |
| 135 | |
| 136 | bool copy_file_impl(const path& from, const path& to, perms from_perms, |
| 137 | std::error_code *ec) |
| 138 | { |
| 139 | std::ifstream in(from.c_str(), std::ios::binary); |
| 140 | std::ofstream out(to.c_str(), std::ios::binary); |
| 141 | |
| 142 | if (in.good() && out.good()) { |
| 143 | using InIt = std::istreambuf_iterator<char>; |
| 144 | using OutIt = std::ostreambuf_iterator<char>; |
| 145 | InIt bin(in); |
| 146 | InIt ein; |
| 147 | OutIt bout(out); |
| 148 | std::copy(bin, ein, bout); |
| 149 | } |
| 150 | if (out.fail() || in.fail()) { |
| 151 | set_or_throw(make_error_code(errc::operation_not_permitted), |
| 152 | ec, "copy_file", from, to); |
| 153 | return false; |
| 154 | } |
| 155 | __permissions(to, from_perms, ec); |
| 156 | // TODO what if permissions fails? |
| 157 | return true; |
| 158 | } |
| 159 | |
| 160 | }} // end namespace detail |
| 161 | |
| 162 | using detail::set_or_throw; |
| 163 | |
| 164 | path __canonical(path const & orig_p, const path& base, std::error_code *ec) |
| 165 | { |
| 166 | path p = absolute(orig_p, base); |
| 167 | char buff[PATH_MAX + 1]; |
| 168 | char *ret; |
| 169 | if ((ret = ::realpath(p.c_str(), buff)) == nullptr) { |
| 170 | set_or_throw(ec, "canonical", orig_p, base); |
| 171 | return {}; |
| 172 | } |
| 173 | if (ec) ec->clear(); |
| 174 | return {ret}; |
| 175 | } |
| 176 | |
| 177 | void __copy(const path& from, const path& to, copy_options options, |
| 178 | std::error_code *ec) |
| 179 | { |
| 180 | const bool sym_status = bool(options & |
| 181 | (copy_options::create_symlinks | copy_options::skip_symlinks)); |
| 182 | |
| 183 | const bool sym_status2 = bool(options & |
| 184 | copy_options::copy_symlinks); |
| 185 | |
| 186 | std::error_code m_ec; |
| 187 | struct ::stat f_st = {}; |
| 188 | const file_status f = sym_status || sym_status2 |
| 189 | ? detail::posix_lstat(from, f_st, &m_ec) |
| 190 | : detail::posix_stat(from, f_st, &m_ec); |
| 191 | if (m_ec) |
| 192 | return set_or_throw(m_ec, ec, "copy", from, to); |
| 193 | |
| 194 | struct ::stat t_st = {}; |
| 195 | const file_status t = sym_status ? detail::posix_lstat(to, t_st, &m_ec) |
| 196 | : detail::posix_stat(to, t_st, &m_ec); |
| 197 | |
| 198 | if (not status_known(t)) |
| 199 | return set_or_throw(m_ec, ec, "copy", from, to); |
| 200 | |
| 201 | if (!exists(f) || is_other(f) || is_other(t) |
| 202 | || (is_directory(f) && is_regular_file(t)) |
| 203 | || detail::stat_equivalent(f_st, t_st)) |
| 204 | { |
| 205 | return set_or_throw(make_error_code(errc::function_not_supported), |
| 206 | ec, "copy", from, to); |
| 207 | } |
| 208 | |
| 209 | if (ec) ec->clear(); |
| 210 | |
| 211 | if (is_symlink(f)) { |
| 212 | if (bool(copy_options::skip_symlinks & options)) { |
| 213 | // do nothing |
| 214 | } else if (not exists(t)) { |
| 215 | __copy_symlink(from, to, ec); |
| 216 | } else { |
| 217 | set_or_throw(make_error_code(errc::file_exists), |
| 218 | ec, "copy", from, to); |
| 219 | } |
| 220 | return; |
| 221 | } |
| 222 | else if (is_regular_file(f)) { |
| 223 | if (bool(copy_options::directories_only & options)) { |
| 224 | // do nothing |
| 225 | } |
| 226 | else if (bool(copy_options::create_symlinks & options)) { |
| 227 | __create_symlink(from, to, ec); |
| 228 | } |
| 229 | else if (bool(copy_options::create_hard_links & options)) { |
| 230 | __create_hard_link(from, to, ec); |
| 231 | } |
| 232 | else if (is_directory(t)) { |
| 233 | __copy_file(from, to / from.filename(), options, ec); |
| 234 | } else { |
| 235 | __copy_file(from, to, options, ec); |
| 236 | } |
| 237 | return; |
| 238 | } |
| 239 | else if (is_directory(f)) { |
| 240 | if (not bool(copy_options::recursive & options) && |
| 241 | bool(copy_options::__in_recursive_copy & options)) |
| 242 | { |
| 243 | return; |
| 244 | } |
| 245 | |
| 246 | if (!exists(t)) { |
| 247 | // create directory to with attributes from 'from'. |
| 248 | __create_directory(to, from, ec); |
| 249 | if (ec && *ec) { return; } |
| 250 | } |
| 251 | directory_iterator it = ec ? directory_iterator(from, *ec) |
| 252 | : directory_iterator(from); |
| 253 | if (ec && *ec) { return; } |
| 254 | std::error_code m_ec; |
| 255 | for (; it != directory_iterator(); it.increment(m_ec)) { |
| 256 | if (m_ec) return set_or_throw(m_ec, ec, "copy", from, to); |
| 257 | __copy(it->path(), to / it->path().filename(), |
| 258 | options | copy_options::__in_recursive_copy, ec); |
| 259 | if (ec && *ec) { return; } |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | |
| 265 | bool __copy_file(const path& from, const path& to, copy_options options, |
| 266 | std::error_code *ec) |
| 267 | { |
| 268 | if (ec) ec->clear(); |
| 269 | |
| 270 | std::error_code m_ec; |
| 271 | auto from_st = detail::posix_stat(from, &m_ec); |
| 272 | if (not is_regular_file(from_st)) { |
| 273 | if (not m_ec) |
| 274 | m_ec = make_error_code(errc::not_supported); |
| 275 | set_or_throw(m_ec, ec, "copy_file", from, to); |
| 276 | return false; |
| 277 | } |
| 278 | |
| 279 | auto to_st = detail::posix_stat(to, &m_ec); |
| 280 | if (!status_known(to_st)) { |
| 281 | set_or_throw(m_ec, ec, "copy_file", from, to); |
| 282 | return false; |
| 283 | } |
| 284 | |
| 285 | const bool to_exists = exists(to_st); |
| 286 | if (to_exists && bool(copy_options::skip_existing & options)) { |
| 287 | return false; |
| 288 | } |
| 289 | else if (to_exists && bool(copy_options::update_existing & options)) { |
| 290 | auto from_time = __last_write_time(from, ec); |
| 291 | if (ec && *ec) { return false; } |
| 292 | auto to_time = __last_write_time(to, ec); |
| 293 | if (ec && *ec) { return false; } |
| 294 | if (from_time <= to_time) { |
| 295 | return false; |
| 296 | } |
| 297 | return detail::copy_file_impl(from, to, from_st.permissions(), ec); |
| 298 | } |
| 299 | else if (!to_exists || bool(copy_options::overwrite_existing & options)) { |
| 300 | return detail::copy_file_impl(from, to, from_st.permissions(), ec); |
| 301 | } |
| 302 | else { |
| 303 | set_or_throw(make_error_code(errc::file_exists), ec, "copy", from, to); |
| 304 | return false; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | void __copy_symlink(const path& existing_symlink, const path& new_symlink, |
| 309 | std::error_code *ec) |
| 310 | { |
| 311 | const path real_path(__read_symlink(existing_symlink, ec)); |
| 312 | if (ec && *ec) { return; } |
| 313 | // NOTE: proposal says you should detect if you should call |
| 314 | // create_symlink or create_directory_symlink. I don't think this |
| 315 | // is needed with POSIX |
| 316 | __create_symlink(real_path, new_symlink, ec); |
| 317 | } |
| 318 | |
| 319 | |
| 320 | bool __create_directories(const path& p, std::error_code *ec) |
| 321 | { |
| 322 | std::error_code m_ec; |
| 323 | auto const st = detail::posix_stat(p, &m_ec); |
| 324 | if (!status_known(st)) { |
| 325 | set_or_throw(m_ec, ec, "create_directories", p); |
| 326 | return false; |
| 327 | } |
| 328 | else if (is_directory(st)) { |
| 329 | if (ec) ec->clear(); |
| 330 | return false; |
| 331 | } |
| 332 | else if (exists(st)) { |
| 333 | set_or_throw(make_error_code(errc::file_exists), |
| 334 | ec, "create_directories", p); |
| 335 | return false; |
| 336 | } |
| 337 | |
| 338 | const path parent = p.parent_path(); |
| 339 | if (!parent.empty()) { |
| 340 | const file_status parent_st = status(parent, m_ec); |
| 341 | if (not status_known(parent_st)) { |
| 342 | set_or_throw(m_ec, ec, "create_directories", p); |
| 343 | return false; |
| 344 | } |
| 345 | if (not exists(parent_st)) { |
| 346 | __create_directories(parent, ec); |
| 347 | if (ec && *ec) { return false; } |
| 348 | } |
| 349 | } |
| 350 | return __create_directory(p, ec); |
| 351 | } |
| 352 | |
| 353 | bool __create_directory(const path& p, std::error_code *ec) |
| 354 | { |
| 355 | if (ec) ec->clear(); |
| 356 | if (::mkdir(p.c_str(), static_cast<int>(perms::all)) == 0) |
| 357 | return true; |
| 358 | if (errno != EEXIST || !is_directory(p)) |
| 359 | set_or_throw(ec, "create_directory", p); |
| 360 | return false; |
| 361 | } |
| 362 | |
| 363 | bool __create_directory(path const & p, path const & attributes, |
| 364 | std::error_code *ec) |
| 365 | { |
| 366 | struct ::stat attr_stat; |
| 367 | std::error_code mec; |
| 368 | auto st = detail::posix_stat(attributes, attr_stat, &mec); |
| 369 | if (!status_known(st)) { |
| 370 | set_or_throw(mec, ec, "create_directory", p, attributes); |
| 371 | return false; |
| 372 | } |
| 373 | if (ec) ec->clear(); |
| 374 | if (::mkdir(p.c_str(), attr_stat.st_mode) == 0) |
| 375 | return true; |
| 376 | if (errno != EEXIST || !is_directory(p)) |
| 377 | set_or_throw(ec, "create_directory", p, attributes); |
| 378 | return false; |
| 379 | } |
| 380 | |
| 381 | void __create_directory_symlink(path const & from, path const & to, |
| 382 | std::error_code *ec){ |
| 383 | if (::symlink(from.c_str(), to.c_str()) != 0) |
| 384 | set_or_throw(ec, "create_directory_symlink", from, to); |
| 385 | else if (ec) |
| 386 | ec->clear(); |
| 387 | } |
| 388 | |
| 389 | void __create_hard_link(const path& from, const path& to, std::error_code *ec){ |
| 390 | if (::link(from.c_str(), to.c_str()) == -1) |
| 391 | set_or_throw(ec, "create_hard_link", from, to); |
| 392 | else if (ec) |
| 393 | ec->clear(); |
| 394 | } |
| 395 | |
| 396 | void __create_symlink(path const & from, path const & to, std::error_code *ec) { |
| 397 | |
| 398 | if (::symlink(from.c_str(), to.c_str()) == -1) |
| 399 | set_or_throw(ec, "create_symlink", from, to); |
| 400 | else if (ec) |
| 401 | ec->clear(); |
| 402 | } |
| 403 | |
| 404 | path __current_path(std::error_code *ec) { |
| 405 | auto size = ::pathconf(".", _PC_PATH_MAX); |
| 406 | _LIBCPP_ASSERT(size >= 0, "pathconf returned a 0 as max size"); |
| 407 | |
| 408 | auto buff = std::unique_ptr<char[]>(new char[size + 1]); |
| 409 | char* ret; |
| 410 | if ((ret = ::getcwd(buff.get(), static_cast<size_t>(size))) == nullptr) { |
| 411 | set_or_throw(ec, "current_path"); |
| 412 | return {}; |
| 413 | } |
| 414 | if (ec) ec->clear(); |
| 415 | return {buff.get()}; |
| 416 | } |
| 417 | |
| 418 | void __current_path(const path& p, std::error_code *ec) { |
| 419 | if (::chdir(p.c_str()) == -1) |
| 420 | set_or_throw(ec, "current_path", p); |
| 421 | else if (ec) |
| 422 | ec->clear(); |
| 423 | } |
| 424 | |
| 425 | bool __equivalent(const path& p1, const path& p2, std::error_code *ec) |
| 426 | { |
| 427 | std::error_code ec1, ec2; |
| 428 | struct ::stat st1 = {}; |
| 429 | struct ::stat st2 = {}; |
| 430 | auto s1 = detail::posix_stat(p1.native(), st1, &ec1); |
| 431 | auto s2 = detail::posix_stat(p2.native(), st2, &ec2); |
| 432 | |
| 433 | if ((!exists(s1) && !exists(s2)) || (is_other(s1) && is_other(s2))) { |
| 434 | set_or_throw(make_error_code(errc::not_supported), ec, |
| 435 | "equivalent", p1, p2); |
| 436 | return false; |
| 437 | } |
| 438 | if (ec) ec->clear(); |
| 439 | return (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino); |
| 440 | } |
| 441 | |
| 442 | |
| 443 | std::uintmax_t __file_size(const path& p, std::error_code *ec) |
| 444 | { |
| 445 | std::error_code m_ec; |
| 446 | struct ::stat st; |
| 447 | file_status fst = detail::posix_stat(p, st, &m_ec); |
| 448 | if (!exists(fst) || !is_regular_file(fst)) { |
| 449 | if (!m_ec) |
| 450 | m_ec = make_error_code(errc::not_supported); |
| 451 | set_or_throw(m_ec, ec, "file_size", p); |
| 452 | return static_cast<uintmax_t>(-1); |
| 453 | } |
| 454 | // is_regular_file(p) == true |
| 455 | if (ec) ec->clear(); |
| 456 | return static_cast<std::uintmax_t>(st.st_size); |
| 457 | } |
| 458 | |
| 459 | std::uintmax_t __hard_link_count(const path& p, std::error_code *ec) |
| 460 | { |
| 461 | std::error_code m_ec; |
| 462 | struct ::stat st; |
| 463 | detail::posix_stat(p, st, &m_ec); |
| 464 | if (m_ec) { |
| 465 | set_or_throw(m_ec, ec, "hard_link_count", p); |
| 466 | return static_cast<std::uintmax_t>(-1); |
| 467 | } |
| 468 | if (ec) ec->clear(); |
| 469 | return static_cast<std::uintmax_t>(st.st_nlink); |
| 470 | } |
| 471 | |
| 472 | |
| 473 | bool __fs_is_empty(const path& p, std::error_code *ec) |
| 474 | { |
| 475 | if (ec) ec->clear(); |
| 476 | std::error_code m_ec; |
| 477 | struct ::stat pst; |
| 478 | auto st = detail::posix_stat(p, pst, &m_ec); |
| 479 | if (is_directory(st)) |
| 480 | return directory_iterator(p) == directory_iterator{}; |
| 481 | else if (is_regular_file(st)) |
| 482 | return static_cast<std::uintmax_t>(pst.st_size) == 0; |
| 483 | // else |
| 484 | set_or_throw(m_ec, ec, "is_empty", p); |
| 485 | return false; |
| 486 | } |
| 487 | |
| 488 | |
Eric Fiselier | 70f7afe | 2016-06-19 02:04:49 +0000 | [diff] [blame] | 489 | namespace detail { namespace { |
| 490 | |
| 491 | template <class CType, class ChronoType> |
| 492 | bool checked_set(CType* out, ChronoType time) { |
| 493 | using Lim = numeric_limits<CType>; |
| 494 | if (time > Lim::max() || time < Lim::min()) |
| 495 | return false; |
| 496 | *out = static_cast<CType>(time); |
| 497 | return true; |
| 498 | } |
| 499 | |
| 500 | constexpr long long min_seconds = file_time_type::duration::min().count() |
| 501 | / file_time_type::period::den; |
| 502 | |
| 503 | template <class SubSecDurT, class SubSecT> |
| 504 | bool set_times_checked(time_t* sec_out, SubSecT* subsec_out, file_time_type tp) { |
| 505 | using namespace chrono; |
| 506 | auto dur = tp.time_since_epoch(); |
| 507 | auto sec_dur = duration_cast<seconds>(dur); |
| 508 | auto subsec_dur = duration_cast<SubSecDurT>(dur - sec_dur); |
| 509 | // The tv_nsec and tv_usec fields must not be negative so adjust accordingly |
| 510 | if (subsec_dur.count() < 0) { |
| 511 | if (sec_dur.count() > min_seconds) { |
| 512 | |
| 513 | sec_dur -= seconds(1); |
| 514 | subsec_dur += seconds(1); |
| 515 | } else { |
| 516 | subsec_dur = SubSecDurT::zero(); |
| 517 | } |
| 518 | } |
| 519 | return checked_set(sec_out, sec_dur.count()) |
| 520 | && checked_set(subsec_out, subsec_dur.count()); |
| 521 | } |
| 522 | |
| 523 | }} // end namespace detail |
| 524 | |
| 525 | |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 526 | file_time_type __last_write_time(const path& p, std::error_code *ec) |
| 527 | { |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 528 | std::error_code m_ec; |
| 529 | struct ::stat st; |
| 530 | detail::posix_stat(p, st, &m_ec); |
| 531 | if (m_ec) { |
| 532 | set_or_throw(m_ec, ec, "last_write_time", p); |
| 533 | return file_time_type::min(); |
| 534 | } |
| 535 | if (ec) ec->clear(); |
Eric Fiselier | 70f7afe | 2016-06-19 02:04:49 +0000 | [diff] [blame] | 536 | return file_time_type::clock::from_time_t(st.st_mtime); |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 537 | } |
| 538 | |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 539 | void __last_write_time(const path& p, file_time_type new_time, |
| 540 | std::error_code *ec) |
| 541 | { |
| 542 | using namespace std::chrono; |
| 543 | std::error_code m_ec; |
| 544 | |
Eric Fiselier | 2730c25 | 2016-06-18 19:11:40 +0000 | [diff] [blame] | 545 | // We can use the presence of UTIME_OMIT to detect platforms that do not |
| 546 | // provide utimensat. |
| 547 | #if !defined(UTIME_OMIT) |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 548 | // This implementation has a race condition between determining the |
| 549 | // last access time and attempting to set it to the same value using |
| 550 | // ::utimes |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 551 | struct ::stat st; |
| 552 | file_status fst = detail::posix_stat(p, st, &m_ec); |
| 553 | if (m_ec && !status_known(fst)) { |
| 554 | set_or_throw(m_ec, ec, "last_write_time", p); |
| 555 | return; |
| 556 | } |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 557 | struct ::timeval tbuf[2]; |
Eric Fiselier | 70f7afe | 2016-06-19 02:04:49 +0000 | [diff] [blame] | 558 | tbuf[0].tv_sec = st.st_atime; |
| 559 | tbuf[0].tv_usec = 0; |
| 560 | const bool overflowed = !detail::set_times_checked<microseconds>( |
| 561 | &tbuf[1].tv_sec, &tbuf[1].tv_usec, new_time); |
| 562 | |
| 563 | if (overflowed) { |
| 564 | set_or_throw(make_error_code(errc::invalid_argument), ec, |
| 565 | "last_write_time", p); |
| 566 | return; |
| 567 | } |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 568 | if (::utimes(p.c_str(), tbuf) == -1) { |
| 569 | m_ec = detail::capture_errno(); |
| 570 | } |
| 571 | #else |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 572 | struct ::timespec tbuf[2]; |
| 573 | tbuf[0].tv_sec = 0; |
| 574 | tbuf[0].tv_nsec = UTIME_OMIT; |
Eric Fiselier | 70f7afe | 2016-06-19 02:04:49 +0000 | [diff] [blame] | 575 | |
| 576 | const bool overflowed = !detail::set_times_checked<nanoseconds>( |
| 577 | &tbuf[1].tv_sec, &tbuf[1].tv_nsec, new_time); |
| 578 | if (overflowed) { |
| 579 | set_or_throw(make_error_code(errc::invalid_argument), |
| 580 | ec, "last_write_time", p); |
| 581 | return; |
| 582 | } |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 583 | if (::utimensat(AT_FDCWD, p.c_str(), tbuf, 0) == -1) { |
| 584 | m_ec = detail::capture_errno(); |
| 585 | } |
| 586 | #endif |
| 587 | if (m_ec) |
| 588 | set_or_throw(m_ec, ec, "last_write_time", p); |
| 589 | else if (ec) |
| 590 | ec->clear(); |
| 591 | } |
| 592 | |
| 593 | |
| 594 | void __permissions(const path& p, perms prms, std::error_code *ec) |
| 595 | { |
| 596 | |
Eric Fiselier | 7c96ddb | 2016-06-21 22:42:42 +0000 | [diff] [blame] | 597 | const bool resolve_symlinks = !bool(perms::symlink_nofollow & prms); |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 598 | const bool add_perms = bool(perms::add_perms & prms); |
| 599 | const bool remove_perms = bool(perms::remove_perms & prms); |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 600 | _LIBCPP_ASSERT(!(add_perms && remove_perms), |
| 601 | "Both add_perms and remove_perms are set"); |
| 602 | |
Eric Fiselier | 55e084d | 2016-06-22 07:57:38 +0000 | [diff] [blame^] | 603 | bool set_sym_perms = false; |
| 604 | prms &= perms::mask; |
| 605 | if (!resolve_symlinks || (add_perms || remove_perms)) { |
| 606 | std::error_code m_ec; |
| 607 | file_status st = resolve_symlinks ? detail::posix_stat(p, &m_ec) |
| 608 | : detail::posix_lstat(p, &m_ec); |
| 609 | set_sym_perms = is_symlink(st); |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 610 | if (m_ec) return set_or_throw(m_ec, ec, "permissions", p); |
Eric Fiselier | 55e084d | 2016-06-22 07:57:38 +0000 | [diff] [blame^] | 611 | _LIBCPP_ASSERT(st.permissions() != perms::unknown, |
| 612 | "Permissions unexpectedly unknown"); |
| 613 | if (add_perms) |
| 614 | prms |= st.permissions(); |
| 615 | else if (remove_perms) |
| 616 | prms = st.permissions() & ~prms; |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 617 | } |
Eric Fiselier | 55e084d | 2016-06-22 07:57:38 +0000 | [diff] [blame^] | 618 | const auto real_perms = detail::posix_convert_perms(prms); |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 619 | |
| 620 | # if defined(AT_SYMLINK_NOFOLLOW) && defined(AT_FDCWD) |
| 621 | const int flags = set_sym_perms ? AT_SYMLINK_NOFOLLOW : 0; |
| 622 | if (::fchmodat(AT_FDCWD, p.c_str(), real_perms, flags) == -1) { |
Eric Fiselier | 7c96ddb | 2016-06-21 22:42:42 +0000 | [diff] [blame] | 623 | return set_or_throw(ec, "permissions", p); |
| 624 | } |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 625 | # else |
| 626 | if (set_sym_perms) |
| 627 | return set_or_throw(make_error_code(errc::operation_not_supported), |
| 628 | ec, "permissions", p); |
| 629 | if (::chmod(p.c_str(), real_perms) == -1) { |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 630 | return set_or_throw(ec, "permissions", p); |
| 631 | } |
Eric Fiselier | 7c96ddb | 2016-06-21 22:42:42 +0000 | [diff] [blame] | 632 | # endif |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 633 | if (ec) ec->clear(); |
| 634 | } |
| 635 | |
| 636 | |
| 637 | path __read_symlink(const path& p, std::error_code *ec) { |
| 638 | char buff[PATH_MAX + 1]; |
| 639 | std::error_code m_ec; |
| 640 | ::ssize_t ret; |
| 641 | if ((ret = ::readlink(p.c_str(), buff, PATH_MAX)) == -1) { |
| 642 | set_or_throw(ec, "read_symlink", p); |
| 643 | return {}; |
| 644 | } |
| 645 | _LIBCPP_ASSERT(ret <= PATH_MAX, "TODO"); |
| 646 | _LIBCPP_ASSERT(ret > 0, "TODO"); |
| 647 | if (ec) ec->clear(); |
| 648 | buff[ret] = 0; |
| 649 | return {buff}; |
| 650 | } |
| 651 | |
| 652 | |
| 653 | bool __remove(const path& p, std::error_code *ec) { |
| 654 | if (ec) ec->clear(); |
| 655 | if (::remove(p.c_str()) == -1) { |
| 656 | set_or_throw(ec, "remove", p); |
| 657 | return false; |
| 658 | } |
| 659 | return true; |
| 660 | } |
| 661 | |
| 662 | namespace { |
| 663 | |
| 664 | std::uintmax_t remove_all_impl(path const & p, std::error_code& ec) |
| 665 | { |
| 666 | const auto npos = static_cast<std::uintmax_t>(-1); |
| 667 | const file_status st = __symlink_status(p, &ec); |
| 668 | if (ec) return npos; |
| 669 | std::uintmax_t count = 1; |
| 670 | if (is_directory(st)) { |
| 671 | for (directory_iterator it(p, ec); !ec && it != directory_iterator(); |
| 672 | it.increment(ec)) { |
| 673 | auto other_count = remove_all_impl(it->path(), ec); |
| 674 | if (ec) return npos; |
| 675 | count += other_count; |
| 676 | } |
| 677 | if (ec) return npos; |
| 678 | } |
| 679 | if (!__remove(p, &ec)) return npos; |
| 680 | return count; |
| 681 | } |
| 682 | |
| 683 | } // end namespace |
| 684 | |
| 685 | std::uintmax_t __remove_all(const path& p, std::error_code *ec) { |
| 686 | std::error_code mec; |
| 687 | auto count = remove_all_impl(p, mec); |
| 688 | if (mec) { |
| 689 | set_or_throw(mec, ec, "remove_all", p); |
| 690 | return static_cast<std::uintmax_t>(-1); |
| 691 | } |
| 692 | if (ec) ec->clear(); |
| 693 | return count; |
| 694 | } |
| 695 | |
| 696 | void __rename(const path& from, const path& to, std::error_code *ec) { |
| 697 | if (::rename(from.c_str(), to.c_str()) == -1) |
| 698 | set_or_throw(ec, "rename", from, to); |
| 699 | else if (ec) |
| 700 | ec->clear(); |
| 701 | } |
| 702 | |
| 703 | void __resize_file(const path& p, std::uintmax_t size, std::error_code *ec) { |
| 704 | if (::truncate(p.c_str(), static_cast<long>(size)) == -1) |
| 705 | set_or_throw(ec, "resize_file", p); |
| 706 | else if (ec) |
| 707 | ec->clear(); |
| 708 | } |
| 709 | |
| 710 | space_info __space(const path& p, std::error_code *ec) { |
| 711 | space_info si; |
Eric Fiselier | 591e18f | 2016-06-18 02:11:48 +0000 | [diff] [blame] | 712 | struct statvfs m_svfs = {}; |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 713 | if (::statvfs(p.c_str(), &m_svfs) == -1) { |
| 714 | set_or_throw(ec, "space", p); |
| 715 | si.capacity = si.free = si.available = |
| 716 | static_cast<std::uintmax_t>(-1); |
| 717 | return si; |
| 718 | } |
| 719 | if (ec) ec->clear(); |
| 720 | // Multiply with overflow checking. |
Eric Fiselier | 591e18f | 2016-06-18 02:11:48 +0000 | [diff] [blame] | 721 | auto do_mult = [&](std::uintmax_t& out, std::uintmax_t other) { |
Eric Fiselier | 6e9a694 | 2016-06-17 19:46:40 +0000 | [diff] [blame] | 722 | out = other * m_svfs.f_frsize; |
| 723 | if (out / other != m_svfs.f_frsize || other == 0) |
| 724 | out = static_cast<std::uintmax_t>(-1); |
| 725 | }; |
| 726 | do_mult(si.capacity, m_svfs.f_blocks); |
| 727 | do_mult(si.free, m_svfs.f_bfree); |
| 728 | do_mult(si.available, m_svfs.f_bavail); |
| 729 | return si; |
| 730 | } |
| 731 | |
| 732 | file_status __status(const path& p, std::error_code *ec) { |
| 733 | return detail::posix_stat(p, ec); |
| 734 | } |
| 735 | |
| 736 | file_status __symlink_status(const path& p, std::error_code *ec) { |
| 737 | return detail::posix_lstat(p, ec); |
| 738 | } |
| 739 | |
| 740 | path __system_complete(const path& p, std::error_code *ec) { |
| 741 | if (ec) ec->clear(); |
| 742 | return absolute(p, current_path()); |
| 743 | } |
| 744 | |
| 745 | path __temp_directory_path(std::error_code *ec) { |
| 746 | const char* env_paths[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"}; |
| 747 | const char* ret = nullptr; |
| 748 | for (auto & ep : env_paths) { |
| 749 | if ((ret = std::getenv(ep))) |
| 750 | break; |
| 751 | } |
| 752 | path p(ret ? ret : "/tmp"); |
| 753 | std::error_code m_ec; |
| 754 | if (is_directory(p, m_ec)) { |
| 755 | if (ec) ec->clear(); |
| 756 | return p; |
| 757 | } |
| 758 | if (!m_ec || m_ec == make_error_code(errc::no_such_file_or_directory)) |
| 759 | m_ec = make_error_code(errc::not_a_directory); |
| 760 | set_or_throw(m_ec, ec, "temp_directory_path"); |
| 761 | return {}; |
| 762 | } |
| 763 | |
| 764 | // An absolute path is composed according to the table in [fs.op.absolute]. |
| 765 | path absolute(const path& p, const path& base) { |
| 766 | auto root_name = p.root_name(); |
| 767 | auto root_dir = p.root_directory(); |
| 768 | |
| 769 | if (!root_name.empty() && !root_dir.empty()) |
| 770 | return p; |
| 771 | |
| 772 | auto abs_base = base.is_absolute() ? base : absolute(base); |
| 773 | |
| 774 | /* !has_root_name && !has_root_dir */ |
| 775 | if (root_name.empty() && root_dir.empty()) |
| 776 | { |
| 777 | return abs_base / p; |
| 778 | } |
| 779 | else if (!root_name.empty()) /* has_root_name && !has_root_dir */ |
| 780 | { |
| 781 | return root_name / abs_base.root_directory() |
| 782 | / |
| 783 | abs_base.relative_path() / p.relative_path(); |
| 784 | } |
| 785 | else /* !has_root_name && has_root_dir */ |
| 786 | { |
| 787 | if (abs_base.has_root_name()) |
| 788 | return abs_base.root_name() / p; |
| 789 | // else p is absolute, return outside of block |
| 790 | } |
| 791 | return p; |
| 792 | } |
| 793 | |
| 794 | _LIBCPP_END_NAMESPACE_EXPERIMENTAL_FILESYSTEM |