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utils-std

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

mv.c (12870B)

    

  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
  31. #ifdef HAS_GETOPT_LONG
  32. #include <getopt.h>
  33. #endif
  35. // Workaround against GNU glibc
  36. // https://sourceware.org/bugzilla/show_bug.cgi?id=18228
  37. #if defined(__linux__) && !defined(O_SEARCH)
  38. // As defined in musl
  39. #define O_SEARCH O_PATH
  40. #endif
  42. const char *argv0 = "mv";
  44. bool no_clob = false, force = false, interact = false, verbose = false;
  46. static int stdin_tty = 0;
  48. struct named_fd
  49. {
  50. 	int fd;
  51. 	const char *name;
  52. 	const char *sep;
  53. };
  55. static int do_renameat(struct named_fd srcdir,
  56.                        const char *restrict src,
  57.                        struct named_fd destdir,
  58.                        const char *restrict dest);
  60. static int
  61. copy_file_unlink(struct named_fd srcdir,
  62.                  const char *restrict src,
  63.                  struct stat src_status,
  64.                  struct named_fd destdir,
  65.                  const char *restrict dest)
  66. {
  67. 	int in = openat(srcdir.fd, src, O_RDONLY | O_NOCTTY);
  68. 	if(in < 0)
  69. 	{
  70. 		fprintf(stderr,
  71. 		        "mv: error: Failed opening source '%s%s%s': %s\n",
  72. 		        srcdir.name,
  73. 		        srcdir.sep,
  74. 		        src,
  75. 		        strerror(errno));
  76. 		errno = 0;
  77. 		return -1;
  78. 	}
  80. 	int out = openat(destdir.fd, dest, O_WRONLY | O_CREAT | O_NOCTTY, src_status.st_mode);
  81. 	if(out < 0)
  82. 	{
  83. 		fprintf(stderr,
  84. 		        "mv: error: Failed opening destination '%s%s%s': %s\n",
  85. 		        destdir.name,
  86. 		        destdir.sep,
  87. 		        dest,
  88. 		        strerror(errno));
  89. 		errno = 0;
  90. 		return -1;
  91. 	}
  93. 	const struct timespec times[2] = {src_status.st_atim, src_status.st_mtim};
  94. 	if(futimens(out, times) != 0)
  95. 	{
  96. 		fprintf(stderr,
  97. 		        "mv: warning: Failed copying access & modification times to '%s%s%s': %s\n",
  98. 		        destdir.name,
  99. 		        destdir.sep,
  100. 		        dest,
  101. 		        strerror(errno));
  102. 		errno = 0;
  103. 	}
  105. 	if(fchown(out, src_status.st_uid, src_status.st_gid) != 0)
  106. 	{
  107. 		fprintf(stderr,
  108. 		        "mv: warning: Failed copying owner & group to '%s%s%s': %s\n",
  109. 		        destdir.name,
  110. 		        destdir.sep,
  111. 		        dest,
  112. 		        strerror(errno));
  113. 		errno = 0;
  114. 	}
  116. 	posix_fadvise(in, 0, 0, POSIX_FADV_SEQUENTIAL);
  117. 	posix_fadvise(out, 0, 0, POSIX_FADV_SEQUENTIAL);
  118. 	errno = 0;
  120. 	if(auto_file_copy(in, out, src_status.st_size, 0) < 0) return -1;
  122. 	return unlinkat(srcdir.fd, src, 0);
  123. }
  125. static int
  126. rename_dir_entries(struct named_fd srcdir, struct named_fd destdir)
  127. {
  128. 	DIR *dirsrc = fdopendir(srcdir.fd);
  129. 	if(dirsrc == NULL)
  130. 	{
  131. 		fprintf(stderr,
  132. 		        "mv: error: Failed fd-opening source directory '%s': %s\n",
  133. 		        srcdir.name ? srcdir.name : ".",
  134. 		        strerror(errno));
  135. 		return -1;
  136. 	}
  138. 	while(true)
  139. 	{
  140. 		errno = 0;
  141. 		struct dirent *dirsrc_ent = readdir(dirsrc);
  142. 		if(dirsrc_ent == NULL)
  143. 		{
  144. 			if(errno == 0) break;
  146. 			fprintf(stderr,
  147. 			        "mv: error: Failed reading source directory '%s': %s\n",
  148. 			        srcdir.name ? srcdir.name : ".",
  149. 			        strerror(errno));
  150. 			closedir(dirsrc);
  151. 			errno = 0;
  152. 			return -1;
  153. 		}
  155. 		if(strcmp(dirsrc_ent->d_name, ".") == 0) continue;
  156. 		if(strcmp(dirsrc_ent->d_name, "..") == 0) continue;
  158. 		if(do_renameat(srcdir, dirsrc_ent->d_name, destdir, dirsrc_ent->d_name) < 0)
  159. 		{
  160. 			closedir(dirsrc);
  161. 			return -1;
  162. 		}
  163. 	}
  165. 	return 0;
  166. }
  168. static int
  169. do_renameat(struct named_fd srcdir,
  170.             const char *restrict src,
  171.             struct named_fd destdir,
  172.             const char *restrict dest)
  173. {
  174. 	if(destdir.fd == srcdir.fd && strcmp(src, dest) == 0)
  175. 	{
  176. 		fprintf(stderr, "mv: error: Passed to both source and destination: '%s'\n", src);
  177. 		return -1;
  178. 	}
  180. 	struct stat src_status;
  181. 	if(fstatat(srcdir.fd, src, &src_status, AT_SYMLINK_NOFOLLOW) < 0)
  182. 	{
  183. 		fprintf(stderr,
  184. 		        "mv: error: Failed getting status for source file '%s%s%s': %s\n",
  185. 		        srcdir.name,
  186. 		        srcdir.sep,
  187. 		        src,
  188. 		        strerror(errno));
  189. 		return -1;
  190. 	}
  191. 	if(S_ISLNK(src_status.st_mode))
  192. 	{
  193. 		struct stat src_link_status;
  194. 		if(fstatat(srcdir.fd, src, &src_link_status, 0) == 0)
  195. 		{
  196. 			src_status = src_link_status;
  197. 		}
  198. 	}
  200. 	errno = 0;
  202. 	struct stat dest_status;
  203. 	int ret = fstatat(destdir.fd, dest, &dest_status, 0);
  204. 	if(ret < 0 && errno != ENOENT)
  205. 	{
  206. 		fprintf(stderr,
  207. 		        "mv: error: Failed getting status for destination file '%s%s%s': %s\n",
  208. 		        destdir.name,
  209. 		        destdir.sep,
  210. 		        dest,
  211. 		        strerror(errno));
  212. 		return -1;
  213. 	}
  215. 	errno = 0;
  217. 	if(ret == 0)
  218. 	{
  219. 		if(dest_status.st_ino == src_status.st_ino && dest_status.st_dev == src_status.st_dev) return 0;
  221. 		if(no_clob)
  222. 		{
  223. 			fprintf(stderr,
  224. 			        "mv: error: Destination file '%s%s%s' already exists\n",
  225. 			        destdir.name,
  226. 			        destdir.sep,
  227. 			        dest);
  228. 			return -1;
  229. 		}
  231. 		if(!force)
  232. 		{
  233. 			if(interact)
  234. 			{
  235. 				if(!consentf("mv: Destination file '%s%s%s' already exists, overwrite? [yN] ",
  236. 				             destdir.name,
  237. 				             destdir.sep,
  238. 				             dest))
  239. 					return 0;
  240. 			}
  241. 			else if(stdin_tty)
  242. 			{
  243. 				if(faccessat(destdir.fd, dest, W_OK, 0) == 0)
  244. 				{
  245. 					if(!consentf(
  246. 					       "mv: error: No write permissions for destination file '%s%s%s', overwrite? [yN] ",
  247. 					       destdir.name,
  248. 					       destdir.sep,
  249. 					       dest))
  250. 						return 0;
  251. 				}
  252. 				else
  253. 				{
  254. 					errno = 0;
  255. 				}
  256. 			}
  257. 		}
  258. 	}
  260. 	if(renameat(srcdir.fd, src, destdir.fd, dest) < 0)
  261. 	{
  262. 		switch(errno)
  263. 		{
  264. 		case EXDEV:
  265. 			errno = 0;
  267. 			if(S_ISDIR(src_status.st_mode))
  268. 			{
  269. 				char child_srcdir_name[PATH_MAX] = "";
  270. 				snprintf(child_srcdir_name, PATH_MAX, "%s%s%s", srcdir.name, srcdir.sep, src);
  272. 				struct named_fd child_srcdir = {
  273. 				    .fd = openat(srcdir.fd, src, O_RDONLY | O_DIRECTORY | O_CLOEXEC),
  274. 				    .name = child_srcdir_name,
  275. 				    .sep = "/",
  276. 				};
  278. 				if(child_srcdir.fd < 0)
  279. 				{
  280. 					fprintf(stderr,
  281. 					        "mv: error: Failed opening source directory '%s%s%s': %s\n",
  282. 					        srcdir.name,
  283. 					        srcdir.sep,
  284. 					        src,
  285. 					        strerror(errno));
  286. 					return -1;
  287. 				}
  289. 				if(mkdirat(destdir.fd, dest, src_status.st_mode) < 0)
  290. 				{
  291. 					fprintf(stderr,
  292. 					        "mv: error: Failed creating destination directory '%s%s%s': %s\n",
  293. 					        destdir.name,
  294. 					        destdir.sep,
  295. 					        dest,
  296. 					        strerror(errno));
  297. 					return -1;
  298. 				}
  300. 				char child_destdir_name[PATH_MAX] = "";
  301. 				snprintf(child_destdir_name, PATH_MAX, "%s%s%s", destdir.name, destdir.sep, dest);
  302. 				struct named_fd child_destdir = {
  303. 				    .fd = openat(destdir.fd, dest, O_RDONLY | O_DIRECTORY | O_CLOEXEC),
  304. 				    .name = child_destdir_name,
  305. 				    .sep = "/",
  306. 				};
  308. 				if(child_destdir.fd < 0)
  309. 				{
  310. 					fprintf(stderr,
  311. 					        "mv: error: Failed opening destination directory '%s%s%s': %s\n",
  312. 					        destdir.name,
  313. 					        destdir.sep,
  314. 					        dest,
  315. 					        strerror(errno));
  316. 					return -1;
  317. 				}
  319. 				if(rename_dir_entries(child_srcdir, child_destdir) < 0) return -1;
  321. 				close(child_srcdir.fd);
  322. 				close(child_destdir.fd);
  324. 				if(unlinkat(srcdir.fd, src, AT_REMOVEDIR) < 0)
  325. 				{
  326. 					fprintf(stderr,
  327. 					        "mv: error: Failed removing source directory '%s%s%s': %s\n",
  328. 					        srcdir.name,
  329. 					        srcdir.sep,
  330. 					        src,
  331. 					        strerror(errno));
  332. 					return -1;
  333. 				}
  334. 			}
  335. 			else
  336. 			{
  337. 				if(copy_file_unlink(srcdir, src, src_status, destdir, dest) < 0) return -1;
  338. 			}
  339. 			break;
  340. 		case EISDIR:
  341. 		case ENOTDIR:
  342. 			if(destdir.fd != AT_FDCWD)
  343. 			{
  344. 				fprintf(
  345. 				    stderr, "mv: error: Failed moving '%s' into '%s': %s\n", src, dest, strerror(errno));
  346. 				return -1;
  347. 			}
  349. 			int tmp_destdir = openat(destdir.fd, dest, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  350. 			if(tmp_destdir < 0)
  351. 			{
  352. 				fprintf(stderr,
  353. 				        "mv: error: Failed opening destination directory '%s': %s\n",
  354. 				        dest,
  355. 				        strerror(errno));
  356. 				return -1;
  357. 			}
  359. 			if(renameat(srcdir.fd, src, tmp_destdir, src) < 0)
  360. 			{
  361. 				fprintf(stderr,
  362. 				        "mv: error: Failed moving '%s' into directory '%s': %s\n",
  363. 				        src,
  364. 				        dest,
  365. 				        strerror(errno));
  366. 				return -1;
  367. 			}
  369. 			if(close(tmp_destdir) < 0)
  370. 			{
  371. 				fprintf(stderr, "mv: error: Failed closing directory '%s': %s\n", dest, strerror(errno));
  372. 				return -1;
  373. 			}
  374. 			break;
  375. 		default:
  376. 			fprintf(stderr,
  377. 			        "mv: error: Failed moving '%s' to '%s%s%s': %s\n",
  378. 			        src,
  379. 			        destdir.name,
  380. 			        destdir.sep,
  381. 			        dest,
  382. 			        strerror(errno));
  383. 			return -1;
  384. 		}
  385. 	}
  387. 	if(verbose)
  388. 		fprintf(stderr, "mv: renamed '%s' -> '%s%s%s'\n", src, destdir.name, destdir.sep, dest);
  390. 	return 0;
  391. }
  393. static void
  394. usage(void)
  395. {
  396. 	fprintf(stderr, "Usage: mv [-f|-i|-n] [-v] source dest\n");
  397. 	fprintf(stderr, "       mv [-f|-i|-n] [-v] source... destdir\n");
  398. 	fprintf(stderr, "       mv [-f|-i|-n] [-v] -t destdir source...\n");
  399. }
  401. int
  402. main(int argc, char *argv[])
  403. {
  404. 	struct named_fd destdir = {
  405. 	    .fd = AT_FDCWD,
  406. 	    .name = "",
  407. 	    .sep = "",
  408. 	};
  409. 	struct named_fd srcdir = {
  410. 	    .fd = AT_FDCWD,
  411. 	    .name = "",
  412. 	    .sep = "",
  413. 	};
  415. #ifdef HAS_GETOPT_LONG
  416. 	// Strictly for GNUisms compatibility so no long-only options
  417. 	// clang-format off
  418. 	static struct option opts[] = {
  419. 		{"force", no_argument, NULL, 'f'},
  420. 		{"interactive", no_argument, NULL, 'i'},
  421. 		{"no-clobber", no_argument, NULL, 'n'},
  422. 		{"target-directory", required_argument, NULL, 't'},
  423. 		{"verbose", no_argument, NULL, 'v'},
  424. 		{0, 0, 0, 0},
  425. 	};
  426. 	// clang-format on
  428. 	// Need + as first character to get POSIX-style option parsing
  429. 	for(int c = -1; (c = getopt_long(argc, argv, "+:fint:v", opts, NULL)) != -1;)
  430. #else
  431. 	for(int c = -1; (c = getopt_nolong(argc, argv, ":fint:v")) != -1;)
  432. #endif
  433. 	{
  434. 		switch(c)
  435. 		{
  436. 		case 'f':
  437. 			force = true;
  438. 			interact = false;
  439. 			no_clob = false;
  440. 			break;
  441. 		case 'i':
  442. 			force = false;
  443. 			interact = true;
  444. 			no_clob = false;
  445. 			break;
  446. 		case 'n':
  447. 			force = false;
  448. 			interact = false;
  449. 			no_clob = true;
  450. 			break;
  451. 		case 't':
  452. 			destdir.name = optarg;
  453. 			destdir.sep = "/";
  454. 			destdir.fd = open(optarg, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  456. 			if(destdir.fd < 0)
  457. 			{
  458. 				fprintf(stderr,
  459. 				        "mv: error: Failed opening destination directory '%s': %s\n",
  460. 				        optarg,
  461. 				        strerror(errno));
  462. 				return 1;
  463. 			}
  464. 			break;
  465. 		case 'v':
  466. 			verbose = true;
  467. 			break;
  468. 		case ':':
  469. 			fprintf(stderr, "mv: error: Missing operand for option: '-%c'\n", optopt);
  470. 			usage();
  471. 			return 1;
  472. 		case '?':
  473. 			GETOPT_UNKNOWN_OPT
  474. 			usage();
  475. 			return 1;
  476. 		}
  477. 	}
  479. 	argc -= optind;
  480. 	argv += optind;
  482. 	char *lc_all = setlocale(LC_ALL, "");
  483. 	if(lc_all == NULL)
  484. 	{
  485. 		fprintf(stderr,
  486. 		        "%s: warning: Failed loading locales. setlocale(LC_ALL, \"\"): %s\n",
  487. 		        argv0,
  488. 		        strerror(errno));
  489. 	}
  490. 	errno = 0;
  492. 	consent_init();
  494. 	stdin_tty = isatty(STDIN_FILENO);
  495. 	if(!stdin_tty) errno = 0;
  497. 	if(destdir.fd == AT_FDCWD)
  498. 	{
  499. 		if(argc <= 1)
  500. 		{
  501. 			fprintf(stderr, "mv: error: Not enough operands, %d given, expect >= 2\n", argc);
  502. 			return 1;
  503. 		}
  505. 		struct stat dest_status;
  506. 		int ret_stat = fstatat(destdir.fd, argv[1], &dest_status, 0);
  507. 		if(
  508. 		    // clang-format off
  509. 		    argc == 2 && (
  510. 		        (ret_stat != 0 && errno == ENOENT) ||
  511. 		        (ret_stat == 0 && !S_ISDIR(dest_status.st_mode))
  512. 		    )
  513. 		    // clang-format on
  514. 		)
  515. 		{
  516. 			int ret = do_renameat(srcdir, argv[0], destdir, argv[1]);
  518. 			consent_finish();
  519. 			return ret < 0 ? 1 : 0;
  520. 		}
  521. 		errno = 0;
  523. 		argc--;
  524. 		destdir.name = argv[argc];
  525. 		destdir.sep = "/";
  526. 		destdir.fd = open(destdir.name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  527. 		if(destdir.fd < 0)
  528. 		{
  529. 			fprintf(stderr,
  530. 			        "mv: error: Failed opening destination directory '%s': %s\n",
  531. 			        destdir.name,
  532. 			        strerror(errno));
  534. 			consent_finish();
  535. 			return 1;
  536. 		}
  537. 	}
  539. 	for(int i = 0; i < argc; i++)
  540. 	{
  541. 		char arg[PATH_MAX] = "";
  542. 		strcpy(arg, argv[i]);
  544. 		char *filename = basename(arg);
  546. 		if(do_renameat(srcdir, argv[i], destdir, filename) < 0)
  547. 		{
  548. 			consent_finish();
  549. 			return 1;
  550. 		}
  551. 	}
  553. 	consent_finish();
  555. 	if(close(destdir.fd) < 0)
  556. 	{
  557. 		fprintf(
  558. 		    stderr, "mv: error: Failed closing directory '%s': %s\n", destdir.name, strerror(errno));
  559. 		return 1;
  560. 	}
  562. 	return 0;
  563. }