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utils-std

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

mv.c (13015B)

    

  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"
  18. #include "../libutils/lib_string.h"
  20. #include <dirent.h> // fdopendir
  21. #include <errno.h>
  22. #include <fcntl.h>  // open
  23. #include <libgen.h> // basename
  24. #include <limits.h> // PATH_MAX
  25. #include <locale.h> // setlocale
  26. #include <stdbool.h>
  27. #include <stdint.h>   // SIZE_MAX
  28. #include <stdio.h>    // fprintf, rename
  29. #include <string.h>   // strcmp
  30. #include <sys/stat.h> // stat, S_ISDIR
  31. #include <unistd.h>   // getopt
  32. #ifdef HAS_GETOPT_LONG
  33. #include <getopt.h>
  34. #endif
  36. // Workaround against GNU glibc
  37. // https://sourceware.org/bugzilla/show_bug.cgi?id=18228
  38. #if defined(__linux__) && !defined(O_SEARCH)
  39. // As defined in musl
  40. #define O_SEARCH O_PATH
  41. #endif
  43. const char *argv0 = "mv";
  45. bool no_clob = false, force = false, interact = false, verbose = false;
  47. static int stdin_tty = 0;
  49. struct named_fd
  50. {
  51. 	int fd;
  52. 	const char *name;
  53. 	const char *sep;
  54. };
  56. static int do_renameat(struct named_fd srcdir,
  57.                        const char *restrict src,
  58.                        struct named_fd destdir,
  59.                        const char *restrict dest);
  61. static int
  62. copy_file_unlink(struct named_fd srcdir,
  63.                  const char *restrict src,
  64.                  struct stat src_status,
  65.                  struct named_fd destdir,
  66.                  const char *restrict dest)
  67. {
  68. 	int in = openat(srcdir.fd, src, O_RDONLY | O_NOCTTY);
  69. 	if(in < 0)
  70. 	{
  71. 		fprintf(stderr,
  72. 		        "mv: error: Failed opening source '%s%s%s': %s\n",
  73. 		        srcdir.name,
  74. 		        srcdir.sep,
  75. 		        src,
  76. 		        strerror(errno));
  77. 		errno = 0;
  78. 		return -1;
  79. 	}
  81. 	int out = openat(destdir.fd, dest, O_WRONLY | O_CREAT | O_NOCTTY, src_status.st_mode);
  82. 	if(out < 0)
  83. 	{
  84. 		fprintf(stderr,
  85. 		        "mv: error: Failed opening destination '%s%s%s': %s\n",
  86. 		        destdir.name,
  87. 		        destdir.sep,
  88. 		        dest,
  89. 		        strerror(errno));
  90. 		errno = 0;
  91. 		return -1;
  92. 	}
  94. 	const struct timespec times[2] = {src_status.st_atim, src_status.st_mtim};
  95. 	if(futimens(out, times) != 0)
  96. 	{
  97. 		fprintf(stderr,
  98. 		        "mv: warning: Failed copying access & modification times to '%s%s%s': %s\n",
  99. 		        destdir.name,
  100. 		        destdir.sep,
  101. 		        dest,
  102. 		        strerror(errno));
  103. 		errno = 0;
  104. 	}
  106. 	if(fchown(out, src_status.st_uid, src_status.st_gid) != 0)
  107. 	{
  108. 		fprintf(stderr,
  109. 		        "mv: warning: Failed copying owner & group to '%s%s%s': %s\n",
  110. 		        destdir.name,
  111. 		        destdir.sep,
  112. 		        dest,
  113. 		        strerror(errno));
  114. 		errno = 0;
  115. 	}
  117. 	posix_fadvise(in, 0, 0, POSIX_FADV_SEQUENTIAL);
  118. 	posix_fadvise(out, 0, 0, POSIX_FADV_SEQUENTIAL);
  119. 	errno = 0;
  121. 	if(auto_file_copy(in, out, src_status.st_size, 0) < 0) return -1;
  123. 	int err = 0;
  124. 	err += close(in);
  125. 	err += close(out);
  126. 	err += unlinkat(srcdir.fd, src, 0);
  128. 	return err;
  129. }
  131. static int
  132. rename_dir_entries(struct named_fd srcdir, struct named_fd destdir)
  133. {
  134. 	DIR *dirsrc = fdopendir(srcdir.fd);
  135. 	if(dirsrc == NULL)
  136. 	{
  137. 		fprintf(stderr,
  138. 		        "mv: error: Failed fd-opening source directory '%s': %s\n",
  139. 		        srcdir.name ? srcdir.name : ".",
  140. 		        strerror(errno));
  141. 		return -1;
  142. 	}
  144. 	while(true)
  145. 	{
  146. 		errno = 0;
  147. 		struct dirent *dirsrc_ent = readdir(dirsrc);
  148. 		if(dirsrc_ent == NULL)
  149. 		{
  150. 			if(errno == 0) break;
  152. 			fprintf(stderr,
  153. 			        "mv: error: Failed reading source directory '%s': %s\n",
  154. 			        srcdir.name ? srcdir.name : ".",
  155. 			        strerror(errno));
  156. 			closedir(dirsrc);
  157. 			errno = 0;
  158. 			return -1;
  159. 		}
  161. 		if(strcmp(dirsrc_ent->d_name, ".") == 0) continue;
  162. 		if(strcmp(dirsrc_ent->d_name, "..") == 0) continue;
  164. 		if(do_renameat(srcdir, dirsrc_ent->d_name, destdir, dirsrc_ent->d_name) < 0)
  165. 		{
  166. 			closedir(dirsrc);
  167. 			return -1;
  168. 		}
  169. 	}
  171. 	closedir(dirsrc);
  173. 	return 0;
  174. }
  176. static int
  177. do_renameat(struct named_fd srcdir,
  178.             const char *restrict src,
  179.             struct named_fd destdir,
  180.             const char *restrict dest)
  181. {
  182. 	if(destdir.fd == srcdir.fd && strcmp(src, dest) == 0)
  183. 	{
  184. 		fprintf(stderr, "mv: error: Passed to both source and destination: '%s'\n", src);
  185. 		return -1;
  186. 	}
  188. 	struct stat src_status;
  189. 	if(fstatat(srcdir.fd, src, &src_status, AT_SYMLINK_NOFOLLOW) < 0)
  190. 	{
  191. 		fprintf(stderr,
  192. 		        "mv: error: Failed getting status for source file '%s%s%s': %s\n",
  193. 		        srcdir.name,
  194. 		        srcdir.sep,
  195. 		        src,
  196. 		        strerror(errno));
  197. 		return -1;
  198. 	}
  199. 	if(S_ISLNK(src_status.st_mode))
  200. 	{
  201. 		struct stat src_link_status;
  202. 		if(fstatat(srcdir.fd, src, &src_link_status, 0) == 0)
  203. 		{
  204. 			src_status = src_link_status;
  205. 		}
  206. 	}
  208. 	errno = 0;
  210. 	struct stat dest_status;
  211. 	int ret = fstatat(destdir.fd, dest, &dest_status, 0);
  212. 	if(ret < 0 && errno != ENOENT)
  213. 	{
  214. 		fprintf(stderr,
  215. 		        "mv: error: Failed getting status for destination file '%s%s%s': %s\n",
  216. 		        destdir.name,
  217. 		        destdir.sep,
  218. 		        dest,
  219. 		        strerror(errno));
  220. 		return -1;
  221. 	}
  223. 	errno = 0;
  225. 	if(ret == 0)
  226. 	{
  227. 		if(dest_status.st_ino == src_status.st_ino && dest_status.st_dev == src_status.st_dev) return 0;
  229. 		if(no_clob)
  230. 		{
  231. 			fprintf(stderr,
  232. 			        "mv: error: Destination file '%s%s%s' already exists\n",
  233. 			        destdir.name,
  234. 			        destdir.sep,
  235. 			        dest);
  236. 			return -1;
  237. 		}
  239. 		if(!force)
  240. 		{
  241. 			if(interact)
  242. 			{
  243. 				if(!consentf("mv: Destination file '%s%s%s' already exists, overwrite? [yN] ",
  244. 				             destdir.name,
  245. 				             destdir.sep,
  246. 				             dest))
  247. 					return 0;
  248. 			}
  249. 			else if(stdin_tty)
  250. 			{
  251. 				if(faccessat(destdir.fd, dest, W_OK, 0) == 0)
  252. 				{
  253. 					if(!consentf(
  254. 					       "mv: error: No write permissions for destination file '%s%s%s', overwrite? [yN] ",
  255. 					       destdir.name,
  256. 					       destdir.sep,
  257. 					       dest))
  258. 						return 0;
  259. 				}
  260. 				else
  261. 				{
  262. 					errno = 0;
  263. 				}
  264. 			}
  265. 		}
  266. 	}
  268. 	if(renameat(srcdir.fd, src, destdir.fd, dest) < 0)
  269. 	{
  270. 		switch(errno)
  271. 		{
  272. 		case EXDEV:
  273. 			errno = 0;
  275. 			if(S_ISDIR(src_status.st_mode))
  276. 			{
  277. 				char child_srcdir_name[PATH_MAX] = "";
  278. 				snprintf(child_srcdir_name, PATH_MAX, "%s%s%s", srcdir.name, srcdir.sep, src);
  280. 				struct named_fd child_srcdir = {
  281. 				    .fd = openat(srcdir.fd, src, O_RDONLY | O_DIRECTORY | O_CLOEXEC),
  282. 				    .name = child_srcdir_name,
  283. 				    .sep = "/",
  284. 				};
  286. 				if(child_srcdir.fd < 0)
  287. 				{
  288. 					fprintf(stderr,
  289. 					        "mv: error: Failed opening source directory '%s%s%s': %s\n",
  290. 					        srcdir.name,
  291. 					        srcdir.sep,
  292. 					        src,
  293. 					        strerror(errno));
  294. 					return -1;
  295. 				}
  297. 				if(mkdirat(destdir.fd, dest, src_status.st_mode) < 0)
  298. 				{
  299. 					fprintf(stderr,
  300. 					        "mv: error: Failed creating destination directory '%s%s%s': %s\n",
  301. 					        destdir.name,
  302. 					        destdir.sep,
  303. 					        dest,
  304. 					        strerror(errno));
  305. 					return -1;
  306. 				}
  308. 				char child_destdir_name[PATH_MAX] = "";
  309. 				snprintf(child_destdir_name, PATH_MAX, "%s%s%s", destdir.name, destdir.sep, dest);
  310. 				struct named_fd child_destdir = {
  311. 				    .fd = openat(destdir.fd, dest, O_RDONLY | O_DIRECTORY | O_CLOEXEC),
  312. 				    .name = child_destdir_name,
  313. 				    .sep = "/",
  314. 				};
  316. 				if(child_destdir.fd < 0)
  317. 				{
  318. 					fprintf(stderr,
  319. 					        "mv: error: Failed opening destination directory '%s%s%s': %s\n",
  320. 					        destdir.name,
  321. 					        destdir.sep,
  322. 					        dest,
  323. 					        strerror(errno));
  324. 					return -1;
  325. 				}
  327. 				if(rename_dir_entries(child_srcdir, child_destdir) < 0) return -1;
  329. 				close(child_srcdir.fd);
  330. 				close(child_destdir.fd);
  332. 				if(unlinkat(srcdir.fd, src, AT_REMOVEDIR) < 0)
  333. 				{
  334. 					fprintf(stderr,
  335. 					        "mv: error: Failed removing source directory '%s%s%s': %s\n",
  336. 					        srcdir.name,
  337. 					        srcdir.sep,
  338. 					        src,
  339. 					        strerror(errno));
  340. 					return -1;
  341. 				}
  342. 			}
  343. 			else
  344. 			{
  345. 				if(copy_file_unlink(srcdir, src, src_status, destdir, dest) < 0) return -1;
  346. 			}
  347. 			break;
  348. 		case EISDIR:
  349. 		case ENOTDIR:
  350. 			if(destdir.fd != AT_FDCWD)
  351. 			{
  352. 				fprintf(
  353. 				    stderr, "mv: error: Failed moving '%s' into '%s': %s\n", src, dest, strerror(errno));
  354. 				return -1;
  355. 			}
  357. 			int tmp_destdir = openat(destdir.fd, dest, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  358. 			if(tmp_destdir < 0)
  359. 			{
  360. 				fprintf(stderr,
  361. 				        "mv: error: Failed opening destination directory '%s': %s\n",
  362. 				        dest,
  363. 				        strerror(errno));
  364. 				return -1;
  365. 			}
  367. 			if(renameat(srcdir.fd, src, tmp_destdir, src) < 0)
  368. 			{
  369. 				fprintf(stderr,
  370. 				        "mv: error: Failed moving '%s' into directory '%s': %s\n",
  371. 				        src,
  372. 				        dest,
  373. 				        strerror(errno));
  374. 				return -1;
  375. 			}
  377. 			if(close(tmp_destdir) < 0)
  378. 			{
  379. 				fprintf(stderr, "mv: error: Failed closing directory '%s': %s\n", dest, strerror(errno));
  380. 				return -1;
  381. 			}
  382. 			break;
  383. 		default:
  384. 			fprintf(stderr,
  385. 			        "mv: error: Failed moving '%s' to '%s%s%s': %s\n",
  386. 			        src,
  387. 			        destdir.name,
  388. 			        destdir.sep,
  389. 			        dest,
  390. 			        strerror(errno));
  391. 			return -1;
  392. 		}
  393. 	}
  395. 	if(verbose)
  396. 		fprintf(stderr, "mv: renamed '%s' -> '%s%s%s'\n", src, destdir.name, destdir.sep, dest);
  398. 	return 0;
  399. }
  401. static void
  402. usage(void)
  403. {
  404. 	fprintf(stderr, "Usage: mv [-f|-i|-n] [-v] source dest\n");
  405. 	fprintf(stderr, "       mv [-f|-i|-n] [-v] source... destdir\n");
  406. 	fprintf(stderr, "       mv [-f|-i|-n] [-v] -t destdir source...\n");
  407. }
  409. int
  410. main(int argc, char *argv[])
  411. {
  412. 	struct named_fd destdir = {
  413. 	    .fd = AT_FDCWD,
  414. 	    .name = "",
  415. 	    .sep = "",
  416. 	};
  417. 	struct named_fd srcdir = {
  418. 	    .fd = AT_FDCWD,
  419. 	    .name = "",
  420. 	    .sep = "",
  421. 	};
  423. #ifdef HAS_GETOPT_LONG
  424. 	// Strictly for GNUisms compatibility so no long-only options
  425. 	// clang-format off
  426. 	static struct option opts[] = {
  427. 		{"force", no_argument, NULL, 'f'},
  428. 		{"interactive", no_argument, NULL, 'i'},
  429. 		{"no-clobber", no_argument, NULL, 'n'},
  430. 		{"target-directory", required_argument, NULL, 't'},
  431. 		{"verbose", no_argument, NULL, 'v'},
  432. 		{0, 0, 0, 0},
  433. 	};
  434. 	// clang-format on
  436. 	// Need + as first character to get POSIX-style option parsing
  437. 	for(int c = -1; (c = getopt_long(argc, argv, "+:fint:v", opts, NULL)) != -1;)
  438. #else
  439. 	for(int c = -1; (c = getopt_nolong(argc, argv, ":fint:v")) != -1;)
  440. #endif
  441. 	{
  442. 		switch(c)
  443. 		{
  444. 		case 'f':
  445. 			force = true;
  446. 			interact = false;
  447. 			no_clob = false;
  448. 			break;
  449. 		case 'i':
  450. 			force = false;
  451. 			interact = true;
  452. 			no_clob = false;
  453. 			break;
  454. 		case 'n':
  455. 			force = false;
  456. 			interact = false;
  457. 			no_clob = true;
  458. 			break;
  459. 		case 't':
  460. 			destdir.name = optarg;
  461. 			destdir.sep = "/";
  462. 			destdir.fd = open(optarg, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  464. 			if(destdir.fd < 0)
  465. 			{
  466. 				fprintf(stderr,
  467. 				        "mv: error: Failed opening destination directory '%s': %s\n",
  468. 				        optarg,
  469. 				        strerror(errno));
  470. 				return 1;
  471. 			}
  472. 			break;
  473. 		case 'v':
  474. 			verbose = true;
  475. 			break;
  476. 		case ':':
  477. 			fprintf(stderr, "mv: error: Missing operand for option: '-%c'\n", optopt);
  478. 			usage();
  479. 			return 1;
  480. 		case '?':
  481. 			GETOPT_UNKNOWN_OPT
  482. 			usage();
  483. 			return 1;
  484. 		}
  485. 	}
  487. 	argc -= optind;
  488. 	argv += optind;
  490. 	char *lc_all = setlocale(LC_ALL, "");
  491. 	if(lc_all == NULL)
  492. 	{
  493. 		fprintf(stderr,
  494. 		        "%s: warning: Failed loading locales. setlocale(LC_ALL, \"\"): %s\n",
  495. 		        argv0,
  496. 		        strerror(errno));
  497. 	}
  498. 	errno = 0;
  500. 	consent_init();
  502. 	stdin_tty = isatty(STDIN_FILENO);
  503. 	if(!stdin_tty) errno = 0;
  505. 	if(destdir.fd == AT_FDCWD)
  506. 	{
  507. 		if(argc <= 1)
  508. 		{
  509. 			fprintf(stderr, "mv: error: Not enough operands, %d given, expect >= 2\n", argc);
  510. 			return 1;
  511. 		}
  513. 		struct stat dest_status;
  514. 		int ret_stat = fstatat(destdir.fd, argv[1], &dest_status, 0);
  515. 		if(
  516. 		    // clang-format off
  517. 		    argc == 2 && (
  518. 		        (ret_stat != 0 && errno == ENOENT) ||
  519. 		        (ret_stat == 0 && !S_ISDIR(dest_status.st_mode))
  520. 		    )
  521. 		    // clang-format on
  522. 		)
  523. 		{
  524. 			int ret = do_renameat(srcdir, argv[0], destdir, argv[1]);
  526. 			consent_finish();
  527. 			return ret < 0 ? 1 : 0;
  528. 		}
  529. 		errno = 0;
  531. 		argc--;
  532. 		destdir.name = argv[argc];
  533. 		destdir.sep = "/";
  534. 		destdir.fd = open(destdir.name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  535. 		if(destdir.fd < 0)
  536. 		{
  537. 			fprintf(stderr,
  538. 			        "mv: error: Failed opening destination directory '%s': %s\n",
  539. 			        destdir.name,
  540. 			        strerror(errno));
  542. 			consent_finish();
  543. 			return 1;
  544. 		}
  545. 	}
  547. 	for(int i = 0; i < argc; i++)
  548. 	{
  549. 		static char arg[PATH_MAX] = "";
  550. 		lib_strlcpy(arg, argv[i], PATH_MAX);
  552. 		char *filename = basename(arg);
  554. 		if(do_renameat(srcdir, argv[i], destdir, filename) < 0)
  555. 		{
  556. 			consent_finish();
  557. 			return 1;
  558. 		}
  559. 	}
  561. 	consent_finish();
  563. 	if(close(destdir.fd) < 0)
  564. 	{
  565. 		fprintf(
  566. 		    stderr, "mv: error: Failed closing directory '%s': %s\n", destdir.name, strerror(errno));
  567. 		return 1;
  568. 	}
  570. 	return 0;
  571. }