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utils-std

Collection of commonly available Unix tools git clone https://anongit.hacktivis.me/git/utils-std.git/

mv.c (12268B)

    

  1. // utils-std: Collection of commonly available Unix tools
  2. // SPDX-FileCopyrightText: 2017 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
  3. // SPDX-License-Identifier: MPL-2.0
  5. #define _POSIX_C_SOURCE 200809L
  6. #define _GNU_SOURCE // copy_file_range
  7. #define _FILE_OFFSET_BITS 64
  9. // NetBSD <10 hides fdopendir behind _NETBSD_SOURCE
  10. #if __NetBSD_Version__ < 1000000000
  11. #define _NETBSD_SOURCE
  12. #endif
  14. #include "../config.h"
  15. #include "../libutils/consent.h"
  16. #include "../libutils/fs.h"
  17. #include "../libutils/getopt_nolong.h"
  19. #include <dirent.h> // fdopendir
  20. #include <errno.h>
  21. #include <fcntl.h>  // open
  22. #include <libgen.h> // basename
  23. #include <limits.h> // PATH_MAX
  24. #include <locale.h> // setlocale
  25. #include <stdbool.h>
  26. #include <stdint.h>   // SIZE_MAX
  27. #include <stdio.h>    // fprintf, rename
  28. #include <string.h>   // strcmp
  29. #include <sys/stat.h> // stat, S_ISDIR
  30. #include <unistd.h>   // getopt
  32. // Workaround against GNU glibc
  33. // https://sourceware.org/bugzilla/show_bug.cgi?id=18228
  34. #if defined(__linux__) && !defined(O_SEARCH)
  35. // As defined in musl
  36. #define O_SEARCH O_PATH
  37. #endif
  39. const char *argv0 = "mv";
  41. bool no_clob = false, force = false, interact = false, verbose = false;
  43. static int stdin_tty = 0;
  45. struct named_fd
  46. {
  47. 	int fd;
  48. 	const char *name;
  49. 	const char *sep;
  50. };
  52. static int do_renameat(struct named_fd srcdir,
  53.                        const char *restrict src,
  54.                        struct named_fd destdir,
  55.                        const char *restrict dest);
  57. static int
  58. copy_file_unlink(struct named_fd srcdir,
  59.                  const char *restrict src,
  60.                  struct stat src_status,
  61.                  struct named_fd destdir,
  62.                  const char *restrict dest)
  63. {
  64. 	int in = openat(srcdir.fd, src, O_RDONLY | O_NOCTTY);
  65. 	if(in < 0)
  66. 	{
  67. 		fprintf(stderr,
  68. 		        "mv: error: Failed opening source '%s%s%s': %s\n",
  69. 		        srcdir.name,
  70. 		        srcdir.sep,
  71. 		        src,
  72. 		        strerror(errno));
  73. 		errno = 0;
  74. 		return -1;
  75. 	}
  77. 	int out = openat(destdir.fd, dest, O_WRONLY | O_CREAT | O_NOCTTY, src_status.st_mode);
  78. 	if(out < 0)
  79. 	{
  80. 		fprintf(stderr,
  81. 		        "mv: error: Failed opening destination '%s%s%s': %s\n",
  82. 		        destdir.name,
  83. 		        destdir.sep,
  84. 		        dest,
  85. 		        strerror(errno));
  86. 		errno = 0;
  87. 		return -1;
  88. 	}
  90. 	const struct timespec times[2] = {src_status.st_atim, src_status.st_mtim};
  91. 	if(futimens(out, times) != 0)
  92. 	{
  93. 		fprintf(stderr,
  94. 		        "mv: warning: Failed copying access & modification times to '%s%s%s': %s\n",
  95. 		        destdir.name,
  96. 		        destdir.sep,
  97. 		        dest,
  98. 		        strerror(errno));
  99. 		errno = 0;
  100. 	}
  102. 	if(fchown(out, src_status.st_uid, src_status.st_gid) != 0)
  103. 	{
  104. 		fprintf(stderr,
  105. 		        "mv: warning: Failed copying owner & group to '%s%s%s': %s\n",
  106. 		        destdir.name,
  107. 		        destdir.sep,
  108. 		        dest,
  109. 		        strerror(errno));
  110. 		errno = 0;
  111. 	}
  113. 	posix_fadvise(in, 0, 0, POSIX_FADV_SEQUENTIAL);
  114. 	posix_fadvise(out, 0, 0, POSIX_FADV_SEQUENTIAL);
  115. 	errno = 0;
  117. 	if(auto_file_copy(in, out, src_status.st_size, 0) < 0) return -1;
  119. 	return unlinkat(srcdir.fd, src, 0);
  120. }
  122. static int
  123. rename_dir_entries(struct named_fd srcdir, struct named_fd destdir)
  124. {
  125. 	DIR *dirsrc = fdopendir(srcdir.fd);
  126. 	if(dirsrc == NULL)
  127. 	{
  128. 		fprintf(stderr,
  129. 		        "mv: error: Failed fd-opening source directory '%s': %s\n",
  130. 		        srcdir.name ? srcdir.name : ".",
  131. 		        strerror(errno));
  132. 		return -1;
  133. 	}
  135. 	while(true)
  136. 	{
  137. 		errno = 0;
  138. 		struct dirent *dirsrc_ent = readdir(dirsrc);
  139. 		if(dirsrc_ent == NULL)
  140. 		{
  141. 			if(errno == 0) break;
  143. 			fprintf(stderr,
  144. 			        "mv: error: Failed reading source directory '%s': %s\n",
  145. 			        srcdir.name ? srcdir.name : ".",
  146. 			        strerror(errno));
  147. 			closedir(dirsrc);
  148. 			errno = 0;
  149. 			return -1;
  150. 		}
  152. 		if(strcmp(dirsrc_ent->d_name, ".") == 0) continue;
  153. 		if(strcmp(dirsrc_ent->d_name, "..") == 0) continue;
  155. 		if(do_renameat(srcdir, dirsrc_ent->d_name, destdir, dirsrc_ent->d_name) < 0)
  156. 		{
  157. 			closedir(dirsrc);
  158. 			return -1;
  159. 		}
  160. 	}
  162. 	return 0;
  163. }
  165. static int
  166. do_renameat(struct named_fd srcdir,
  167.             const char *restrict src,
  168.             struct named_fd destdir,
  169.             const char *restrict dest)
  170. {
  171. 	if(destdir.fd == srcdir.fd && strcmp(src, dest) == 0)
  172. 	{
  173. 		fprintf(stderr, "mv: error: Passed to both source and destination: '%s'\n", src);
  174. 		return -1;
  175. 	}
  177. 	struct stat src_status;
  178. 	if(fstatat(srcdir.fd, src, &src_status, AT_SYMLINK_NOFOLLOW) < 0)
  179. 	{
  180. 		fprintf(stderr,
  181. 		        "mv: error: Failed getting status for source file '%s%s%s': %s\n",
  182. 		        srcdir.name,
  183. 		        srcdir.sep,
  184. 		        src,
  185. 		        strerror(errno));
  186. 		return -1;
  187. 	}
  188. 	if(S_ISLNK(src_status.st_mode))
  189. 	{
  190. 		struct stat src_link_status;
  191. 		if(fstatat(srcdir.fd, src, &src_link_status, 0) == 0)
  192. 		{
  193. 			src_status = src_link_status;
  194. 		}
  195. 	}
  197. 	errno = 0;
  199. 	struct stat dest_status;
  200. 	int ret = fstatat(destdir.fd, dest, &dest_status, 0);
  201. 	if(ret < 0 && errno != ENOENT)
  202. 	{
  203. 		fprintf(stderr,
  204. 		        "mv: error: Failed getting status for destination file '%s%s%s': %s\n",
  205. 		        destdir.name,
  206. 		        destdir.sep,
  207. 		        dest,
  208. 		        strerror(errno));
  209. 		return -1;
  210. 	}
  212. 	errno = 0;
  214. 	if(ret == 0)
  215. 	{
  216. 		if(dest_status.st_ino == src_status.st_ino && dest_status.st_dev == src_status.st_dev) return 0;
  218. 		if(no_clob)
  219. 		{
  220. 			fprintf(stderr,
  221. 			        "mv: error: Destination file '%s%s%s' already exists\n",
  222. 			        destdir.name,
  223. 			        destdir.sep,
  224. 			        dest);
  225. 			return -1;
  226. 		}
  228. 		if(!force)
  229. 		{
  230. 			if(interact)
  231. 			{
  232. 				if(!consentf("mv: Destination file '%s%s%s' already exists, overwrite? [yN] ",
  233. 				             destdir.name,
  234. 				             destdir.sep,
  235. 				             dest))
  236. 					return 0;
  237. 			}
  238. 			else if(stdin_tty)
  239. 			{
  240. 				if(faccessat(destdir.fd, dest, W_OK, 0) == 0)
  241. 				{
  242. 					if(!consentf(
  243. 					       "mv: error: No write permissions for destination file '%s%s%s', overwrite? [yN] ",
  244. 					       destdir.name,
  245. 					       destdir.sep,
  246. 					       dest))
  247. 						return 0;
  248. 				}
  249. 				else
  250. 				{
  251. 					errno = 0;
  252. 				}
  253. 			}
  254. 		}
  255. 	}
  257. 	if(renameat(srcdir.fd, src, destdir.fd, dest) < 0)
  258. 	{
  259. 		switch(errno)
  260. 		{
  261. 		case EXDEV:
  262. 			errno = 0;
  264. 			if(S_ISDIR(src_status.st_mode))
  265. 			{
  266. 				char child_srcdir_name[PATH_MAX] = "";
  267. 				snprintf(child_srcdir_name, PATH_MAX, "%s%s%s", srcdir.name, srcdir.sep, src);
  269. 				struct named_fd child_srcdir = {
  270. 				    .fd = openat(srcdir.fd, src, O_RDONLY | O_DIRECTORY | O_CLOEXEC),
  271. 				    .name = child_srcdir_name,
  272. 				    .sep = "/",
  273. 				};
  275. 				if(child_srcdir.fd < 0)
  276. 				{
  277. 					fprintf(stderr,
  278. 					        "mv: error: Failed opening source directory '%s%s%s': %s\n",
  279. 					        srcdir.name,
  280. 					        srcdir.sep,
  281. 					        src,
  282. 					        strerror(errno));
  283. 					return -1;
  284. 				}
  286. 				if(mkdirat(destdir.fd, dest, src_status.st_mode) < 0)
  287. 				{
  288. 					fprintf(stderr,
  289. 					        "mv: error: Failed creating destination directory '%s%s%s': %s\n",
  290. 					        destdir.name,
  291. 					        destdir.sep,
  292. 					        dest,
  293. 					        strerror(errno));
  294. 					return -1;
  295. 				}
  297. 				char child_destdir_name[PATH_MAX] = "";
  298. 				snprintf(child_destdir_name, PATH_MAX, "%s%s%s", destdir.name, destdir.sep, dest);
  299. 				struct named_fd child_destdir = {
  300. 				    .fd = openat(destdir.fd, dest, O_RDONLY | O_DIRECTORY | O_CLOEXEC),
  301. 				    .name = child_destdir_name,
  302. 				    .sep = "/",
  303. 				};
  305. 				if(child_destdir.fd < 0)
  306. 				{
  307. 					fprintf(stderr,
  308. 					        "mv: error: Failed opening destination directory '%s%s%s': %s\n",
  309. 					        destdir.name,
  310. 					        destdir.sep,
  311. 					        dest,
  312. 					        strerror(errno));
  313. 					return -1;
  314. 				}
  316. 				if(rename_dir_entries(child_srcdir, child_destdir) < 0) return -1;
  318. 				close(child_srcdir.fd);
  319. 				close(child_destdir.fd);
  321. 				if(unlinkat(srcdir.fd, src, AT_REMOVEDIR) < 0)
  322. 				{
  323. 					fprintf(stderr,
  324. 					        "mv: error: Failed removing source directory '%s%s%s': %s\n",
  325. 					        srcdir.name,
  326. 					        srcdir.sep,
  327. 					        src,
  328. 					        strerror(errno));
  329. 					return -1;
  330. 				}
  331. 			}
  332. 			else
  333. 			{
  334. 				if(copy_file_unlink(srcdir, src, src_status, destdir, dest) < 0) return -1;
  335. 			}
  336. 			break;
  337. 		case EISDIR:
  338. 		case ENOTDIR:
  339. 			if(destdir.fd != AT_FDCWD)
  340. 			{
  341. 				fprintf(
  342. 				    stderr, "mv: error: Failed moving '%s' into '%s': %s\n", src, dest, strerror(errno));
  343. 				return -1;
  344. 			}
  346. 			int tmp_destdir = openat(destdir.fd, dest, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  347. 			if(tmp_destdir < 0)
  348. 			{
  349. 				fprintf(stderr,
  350. 				        "mv: error: Failed opening destination directory '%s': %s\n",
  351. 				        dest,
  352. 				        strerror(errno));
  353. 				return -1;
  354. 			}
  356. 			if(renameat(srcdir.fd, src, tmp_destdir, src) < 0)
  357. 			{
  358. 				fprintf(stderr,
  359. 				        "mv: error: Failed moving '%s' into directory '%s': %s\n",
  360. 				        src,
  361. 				        dest,
  362. 				        strerror(errno));
  363. 				return -1;
  364. 			}
  366. 			if(close(tmp_destdir) < 0)
  367. 			{
  368. 				fprintf(stderr, "mv: error: Failed closing directory '%s': %s\n", dest, strerror(errno));
  369. 				return -1;
  370. 			}
  371. 			break;
  372. 		default:
  373. 			fprintf(stderr,
  374. 			        "mv: error: Failed moving '%s' to '%s%s%s': %s\n",
  375. 			        src,
  376. 			        destdir.name,
  377. 			        destdir.sep,
  378. 			        dest,
  379. 			        strerror(errno));
  380. 			return -1;
  381. 		}
  382. 	}
  384. 	if(verbose)
  385. 		fprintf(stderr, "mv: renamed '%s' -> '%s%s%s'\n", src, destdir.name, destdir.sep, dest);
  387. 	return 0;
  388. }
  390. static void
  391. usage(void)
  392. {
  393. 	fprintf(stderr, "Usage: mv [-f|-i|-n] [-v] source dest\n");
  394. 	fprintf(stderr, "       mv [-f|-i|-n] [-v] source... destdir\n");
  395. 	fprintf(stderr, "       mv [-f|-i|-n] [-v] -t destdir source...\n");
  396. }
  398. int
  399. main(int argc, char *argv[])
  400. {
  401. 	struct named_fd destdir = {
  402. 	    .fd = AT_FDCWD,
  403. 	    .name = "",
  404. 	    .sep = "",
  405. 	};
  406. 	struct named_fd srcdir = {
  407. 	    .fd = AT_FDCWD,
  408. 	    .name = "",
  409. 	    .sep = "",
  410. 	};
  412. 	for(int c = -1; (c = getopt_nolong(argc, argv, ":fint:v")) != -1;)
  413. 	{
  414. 		switch(c)
  415. 		{
  416. 		case 'f':
  417. 			force = true;
  418. 			interact = false;
  419. 			no_clob = false;
  420. 			break;
  421. 		case 'i':
  422. 			force = false;
  423. 			interact = true;
  424. 			no_clob = false;
  425. 			break;
  426. 		case 'n':
  427. 			force = false;
  428. 			interact = false;
  429. 			no_clob = true;
  430. 			break;
  431. 		case 't':
  432. 			destdir.name = optarg;
  433. 			destdir.sep = "/";
  434. 			destdir.fd = open(optarg, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  436. 			if(destdir.fd < 0)
  437. 			{
  438. 				fprintf(stderr,
  439. 				        "mv: error: Failed opening destination directory '%s': %s\n",
  440. 				        optarg,
  441. 				        strerror(errno));
  442. 				return 1;
  443. 			}
  444. 			break;
  445. 		case 'v':
  446. 			verbose = true;
  447. 			break;
  448. 		case ':':
  449. 			fprintf(stderr, "mv: error: Missing operand for option: '-%c'\n", optopt);
  450. 			usage();
  451. 			return 1;
  452. 		case '?':
  453. 			GETOPT_UNKNOWN_OPT
  454. 			usage();
  455. 			return 1;
  456. 		}
  457. 	}
  459. 	argc -= optind;
  460. 	argv += optind;
  462. 	char *lc_all = setlocale(LC_ALL, "");
  463. 	if(lc_all == NULL)
  464. 	{
  465. 		fprintf(stderr,
  466. 		        "%s: warning: Failed loading locales. setlocale(LC_ALL, \"\"): %s\n",
  467. 		        argv0,
  468. 		        strerror(errno));
  469. 	}
  470. 	errno = 0;
  472. 	consent_init();
  474. 	stdin_tty = isatty(STDIN_FILENO);
  475. 	if(!stdin_tty) errno = 0;
  477. 	if(destdir.fd == AT_FDCWD)
  478. 	{
  479. 		if(argc <= 1)
  480. 		{
  481. 			fprintf(stderr, "mv: error: Not enough operands, %d given, expect >= 2\n", argc);
  482. 			return 1;
  483. 		}
  485. 		struct stat dest_status;
  486. 		int ret_stat = fstatat(destdir.fd, argv[1], &dest_status, 0);
  487. 		if(
  488. 		    // clang-format off
  489. 		    argc == 2 && (
  490. 		        (ret_stat != 0 && errno == ENOENT) ||
  491. 		        (ret_stat == 0 && !S_ISDIR(dest_status.st_mode))
  492. 		    )
  493. 		    // clang-format on
  494. 		)
  495. 		{
  496. 			int ret = do_renameat(srcdir, argv[0], destdir, argv[1]);
  498. 			consent_finish();
  499. 			return ret < 0 ? 1 : 0;
  500. 		}
  501. 		errno = 0;
  503. 		argc--;
  504. 		destdir.name = argv[argc];
  505. 		destdir.sep = "/";
  506. 		destdir.fd = open(destdir.name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  507. 		if(destdir.fd < 0)
  508. 		{
  509. 			fprintf(stderr,
  510. 			        "mv: error: Failed opening destination directory '%s': %s\n",
  511. 			        destdir.name,
  512. 			        strerror(errno));
  514. 			consent_finish();
  515. 			return 1;
  516. 		}
  517. 	}
  519. 	for(int i = 0; i < argc; i++)
  520. 	{
  521. 		char arg[PATH_MAX] = "";
  522. 		strcpy(arg, argv[i]);
  524. 		char *filename = basename(arg);
  526. 		if(do_renameat(srcdir, argv[i], destdir, filename) < 0)
  527. 		{
  528. 			consent_finish();
  529. 			return 1;
  530. 		}
  531. 	}
  533. 	consent_finish();
  535. 	if(close(destdir.fd) < 0)
  536. 	{
  537. 		fprintf(
  538. 		    stderr, "mv: error: Failed closing directory '%s': %s\n", destdir.name, strerror(errno));
  539. 		return 1;
  540. 	}
  542. 	return 0;
  543. }