logo

utils-std

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

mv.c (13692B)

    

  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;
  46. bool opt_T = false;
  48. static int stdin_tty = 0;
  50. struct named_fd
  51. {
  52. 	int fd;
  53. 	const char *name;
  54. 	const char *sep;
  55. };
  57. static int do_renameat(struct named_fd srcdir,
  58.                        const char *restrict src,
  59.                        struct named_fd destdir,
  60.                        const char *restrict dest);
  62. static int
  63. copy_file_unlink(struct named_fd srcdir,
  64.                  const char *restrict src,
  65.                  struct stat src_status,
  66.                  struct named_fd destdir,
  67.                  const char *restrict dest)
  68. {
  69. 	int in = openat(srcdir.fd, src, O_RDONLY | O_NOCTTY);
  70. 	if(in < 0)
  71. 	{
  72. 		fprintf(stderr,
  73. 		        "mv: error: Failed opening source '%s%s%s': %s\n",
  74. 		        srcdir.name,
  75. 		        srcdir.sep,
  76. 		        src,
  77. 		        strerror(errno));
  78. 		errno = 0;
  79. 		return -1;
  80. 	}
  82. 	int out = openat(destdir.fd, dest, O_WRONLY | O_CREAT | O_NOCTTY, src_status.st_mode);
  83. 	if(out < 0)
  84. 	{
  85. 		fprintf(stderr,
  86. 		        "mv: error: Failed opening destination '%s%s%s': %s\n",
  87. 		        destdir.name,
  88. 		        destdir.sep,
  89. 		        dest,
  90. 		        strerror(errno));
  91. 		errno = 0;
  92. 		return -1;
  93. 	}
  95. 	const struct timespec times[2] = {src_status.st_atim, src_status.st_mtim};
  96. 	if(futimens(out, times) != 0)
  97. 	{
  98. 		fprintf(stderr,
  99. 		        "mv: warning: Failed copying access & modification times to '%s%s%s': %s\n",
  100. 		        destdir.name,
  101. 		        destdir.sep,
  102. 		        dest,
  103. 		        strerror(errno));
  104. 		errno = 0;
  105. 	}
  107. 	if(fchown(out, src_status.st_uid, src_status.st_gid) != 0)
  108. 	{
  109. 		fprintf(stderr,
  110. 		        "mv: warning: Failed copying owner & group to '%s%s%s': %s\n",
  111. 		        destdir.name,
  112. 		        destdir.sep,
  113. 		        dest,
  114. 		        strerror(errno));
  115. 		errno = 0;
  116. 	}
  118. 	posix_fadvise(in, 0, 0, POSIX_FADV_SEQUENTIAL);
  119. 	posix_fadvise(out, 0, 0, POSIX_FADV_SEQUENTIAL);
  120. 	errno = 0;
  122. 	if(auto_file_copy(in, out, src_status.st_size, 0) < 0) return -1;
  124. 	int err = 0;
  125. 	err += close(in);
  126. 	err += close(out);
  127. 	err += unlinkat(srcdir.fd, src, 0);
  129. 	return err;
  130. }
  132. static int
  133. rename_dir_entries(struct named_fd srcdir, struct named_fd destdir)
  134. {
  135. 	DIR *dirsrc = fdopendir(srcdir.fd);
  136. 	if(dirsrc == NULL)
  137. 	{
  138. 		fprintf(stderr,
  139. 		        "mv: error: Failed fd-opening source directory '%s': %s\n",
  140. 		        srcdir.name ? srcdir.name : ".",
  141. 		        strerror(errno));
  142. 		return -1;
  143. 	}
  145. 	while(true)
  146. 	{
  147. 		errno = 0;
  148. 		struct dirent *dirsrc_ent = readdir(dirsrc);
  149. 		if(dirsrc_ent == NULL)
  150. 		{
  151. 			if(errno == 0) break;
  153. 			fprintf(stderr,
  154. 			        "mv: error: Failed reading source directory '%s': %s\n",
  155. 			        srcdir.name ? srcdir.name : ".",
  156. 			        strerror(errno));
  157. 			closedir(dirsrc);
  158. 			errno = 0;
  159. 			return -1;
  160. 		}
  162. 		if(strcmp(dirsrc_ent->d_name, ".") == 0) continue;
  163. 		if(strcmp(dirsrc_ent->d_name, "..") == 0) continue;
  165. 		if(do_renameat(srcdir, dirsrc_ent->d_name, destdir, dirsrc_ent->d_name) < 0)
  166. 		{
  167. 			closedir(dirsrc);
  168. 			return -1;
  169. 		}
  170. 	}
  172. 	closedir(dirsrc);
  174. 	return 0;
  175. }
  177. static int
  178. do_renameat(struct named_fd srcdir,
  179.             const char *restrict src,
  180.             struct named_fd destdir,
  181.             const char *restrict dest)
  182. {
  183. 	if(destdir.fd == srcdir.fd && strcmp(src, dest) == 0)
  184. 	{
  185. 		fprintf(stderr, "mv: error: Passed to both source and destination: '%s'\n", src);
  186. 		return -1;
  187. 	}
  189. 	struct stat src_status;
  190. 	if(fstatat(srcdir.fd, src, &src_status, AT_SYMLINK_NOFOLLOW) < 0)
  191. 	{
  192. 		fprintf(stderr,
  193. 		        "mv: error: Failed getting status for source file '%s%s%s': %s\n",
  194. 		        srcdir.name,
  195. 		        srcdir.sep,
  196. 		        src,
  197. 		        strerror(errno));
  198. 		return -1;
  199. 	}
  200. 	if(S_ISLNK(src_status.st_mode))
  201. 	{
  202. 		struct stat src_link_status;
  203. 		if(fstatat(srcdir.fd, src, &src_link_status, 0) == 0)
  204. 		{
  205. 			src_status = src_link_status;
  206. 		}
  207. 	}
  209. 	errno = 0;
  211. 	struct stat dest_status;
  212. 	int ret = fstatat(destdir.fd, dest, &dest_status, 0);
  213. 	if(ret < 0 && errno != ENOENT)
  214. 	{
  215. 		fprintf(stderr,
  216. 		        "mv: error: Failed getting status for destination file '%s%s%s': %s\n",
  217. 		        destdir.name,
  218. 		        destdir.sep,
  219. 		        dest,
  220. 		        strerror(errno));
  221. 		return -1;
  222. 	}
  224. 	errno = 0;
  226. 	if(ret == 0)
  227. 	{
  228. 		if(dest_status.st_ino == src_status.st_ino && dest_status.st_dev == src_status.st_dev) return 0;
  230. 		if(no_clob)
  231. 		{
  232. 			fprintf(stderr,
  233. 			        "mv: error: Destination file '%s%s%s' already exists\n",
  234. 			        destdir.name,
  235. 			        destdir.sep,
  236. 			        dest);
  237. 			return -1;
  238. 		}
  240. 		if(!force)
  241. 		{
  242. 			if(interact)
  243. 			{
  244. 				if(!consentf("mv: Destination file '%s%s%s' already exists, overwrite? [yN] ",
  245. 				             destdir.name,
  246. 				             destdir.sep,
  247. 				             dest))
  248. 					return 0;
  249. 			}
  250. 			else if(stdin_tty)
  251. 			{
  252. 				if(faccessat(destdir.fd, dest, W_OK, 0) != 0)
  253. 				{
  254. 					if(!consentf(
  255. 					       "mv: error: No write permissions for destination file '%s%s%s', overwrite? [yN] ",
  256. 					       destdir.name,
  257. 					       destdir.sep,
  258. 					       dest))
  259. 						return 0;
  260. 				}
  261. 				else
  262. 				{
  263. 					errno = 0;
  264. 				}
  265. 			}
  266. 		}
  267. 	}
  269. 	if(renameat(srcdir.fd, src, destdir.fd, dest) < 0)
  270. 	{
  271. 		switch(errno)
  272. 		{
  273. 		case EXDEV:
  274. 			errno = 0;
  276. 			if(S_ISDIR(src_status.st_mode))
  277. 			{
  278. 				char child_srcdir_name[PATH_MAX] = "";
  279. 				snprintf(child_srcdir_name, PATH_MAX, "%s%s%s", srcdir.name, srcdir.sep, src);
  281. 				struct named_fd child_srcdir = {
  282. 				    .fd = openat(srcdir.fd, src, O_RDONLY | O_DIRECTORY | O_CLOEXEC),
  283. 				    .name = child_srcdir_name,
  284. 				    .sep = "/",
  285. 				};
  287. 				if(child_srcdir.fd < 0)
  288. 				{
  289. 					fprintf(stderr,
  290. 					        "mv: error: Failed opening source directory '%s%s%s': %s\n",
  291. 					        srcdir.name,
  292. 					        srcdir.sep,
  293. 					        src,
  294. 					        strerror(errno));
  295. 					return -1;
  296. 				}
  298. 				if(mkdirat(destdir.fd, dest, src_status.st_mode) < 0)
  299. 				{
  300. 					fprintf(stderr,
  301. 					        "mv: error: Failed creating destination directory '%s%s%s': %s\n",
  302. 					        destdir.name,
  303. 					        destdir.sep,
  304. 					        dest,
  305. 					        strerror(errno));
  306. 					return -1;
  307. 				}
  309. 				char child_destdir_name[PATH_MAX] = "";
  310. 				snprintf(child_destdir_name, PATH_MAX, "%s%s%s", destdir.name, destdir.sep, dest);
  311. 				struct named_fd child_destdir = {
  312. 				    .fd = openat(destdir.fd, dest, O_RDONLY | O_DIRECTORY | O_CLOEXEC),
  313. 				    .name = child_destdir_name,
  314. 				    .sep = "/",
  315. 				};
  317. 				if(child_destdir.fd < 0)
  318. 				{
  319. 					fprintf(stderr,
  320. 					        "mv: error: Failed opening destination directory '%s%s%s': %s\n",
  321. 					        destdir.name,
  322. 					        destdir.sep,
  323. 					        dest,
  324. 					        strerror(errno));
  325. 					return -1;
  326. 				}
  328. 				if(rename_dir_entries(child_srcdir, child_destdir) < 0) return -1;
  330. 				close(child_srcdir.fd);
  331. 				close(child_destdir.fd);
  333. 				if(unlinkat(srcdir.fd, src, AT_REMOVEDIR) < 0)
  334. 				{
  335. 					fprintf(stderr,
  336. 					        "mv: error: Failed removing source directory '%s%s%s': %s\n",
  337. 					        srcdir.name,
  338. 					        srcdir.sep,
  339. 					        src,
  340. 					        strerror(errno));
  341. 					return -1;
  342. 				}
  343. 			}
  344. 			else
  345. 			{
  346. 				if(copy_file_unlink(srcdir, src, src_status, destdir, dest) < 0) return -1;
  347. 			}
  348. 			break;
  349. 		case EISDIR:
  350. 		case ENOTDIR:
  351. 			if(opt_T)
  352. 			{
  353. 				fprintf(stderr, "mv: error: Failed moving '%s' to '%s': %s\n", src, dest, strerror(errno));
  354. 				return -1;
  355. 			}
  357. 			if(destdir.fd != AT_FDCWD)
  358. 			{
  359. 				fprintf(
  360. 				    stderr, "mv: error: Failed moving '%s' into '%s': %s\n", src, dest, strerror(errno));
  361. 				return -1;
  362. 			}
  364. 			int tmp_destdir = openat(destdir.fd, dest, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  365. 			if(tmp_destdir < 0)
  366. 			{
  367. 				fprintf(stderr,
  368. 				        "mv: error: Failed opening destination directory '%s': %s\n",
  369. 				        dest,
  370. 				        strerror(errno));
  371. 				return -1;
  372. 			}
  374. 			if(renameat(srcdir.fd, src, tmp_destdir, src) < 0)
  375. 			{
  376. 				fprintf(stderr,
  377. 				        "mv: error: Failed moving '%s' into directory '%s': %s\n",
  378. 				        src,
  379. 				        dest,
  380. 				        strerror(errno));
  381. 				return -1;
  382. 			}
  384. 			if(close(tmp_destdir) < 0)
  385. 			{
  386. 				fprintf(stderr, "mv: error: Failed closing directory '%s': %s\n", dest, strerror(errno));
  387. 				return -1;
  388. 			}
  389. 			break;
  390. 		default:
  391. 			fprintf(stderr,
  392. 			        "mv: error: Failed moving '%s' to '%s%s%s': %s\n",
  393. 			        src,
  394. 			        destdir.name,
  395. 			        destdir.sep,
  396. 			        dest,
  397. 			        strerror(errno));
  398. 			return -1;
  399. 		}
  400. 	}
  402. 	if(verbose)
  403. 		fprintf(stderr, "mv: renamed '%s' -> '%s%s%s'\n", src, destdir.name, destdir.sep, dest);
  405. 	return 0;
  406. }
  408. static void
  409. usage(void)
  410. {
  411. 	fprintf(stderr, "Usage: mv [-f|-i|-n] [-Tv] source dest\n");
  412. 	fprintf(stderr, "       mv [-f|-i|-n] [-v] source... destdir\n");
  413. 	fprintf(stderr, "       mv [-f|-i|-n] [-v] -t destdir source...\n");
  414. }
  416. int
  417. main(int argc, char *argv[])
  418. {
  419. 	struct named_fd destdir = {
  420. 	    .fd = AT_FDCWD,
  421. 	    .name = "",
  422. 	    .sep = "",
  423. 	};
  424. 	struct named_fd srcdir = {
  425. 	    .fd = AT_FDCWD,
  426. 	    .name = "",
  427. 	    .sep = "",
  428. 	};
  430. #ifdef HAS_GETOPT_LONG
  431. 	// Strictly for GNUisms compatibility so no long-only options
  432. 	// clang-format off
  433. 	static struct option opts[] = {
  434. 		{"force", no_argument, NULL, 'f'},
  435. 		{"interactive", no_argument, NULL, 'i'},
  436. 		{"no-clobber", no_argument, NULL, 'n'},
  437. 		{"target-directory", required_argument, NULL, 't'},
  438. 		{"no-target-directory", no_argument, NULL, 'T'},
  439. 		{"verbose", no_argument, NULL, 'v'},
  440. 		{0, 0, 0, 0},
  441. 	};
  442. 	// clang-format on
  444. 	// Need + as first character to get POSIX-style option parsing
  445. 	for(int c = -1; (c = getopt_long(argc, argv, "+:fint:Tv", opts, NULL)) != -1;)
  446. #else
  447. 	for(int c = -1; (c = getopt_nolong(argc, argv, ":fint:Tv")) != -1;)
  448. #endif
  449. 	{
  450. 		switch(c)
  451. 		{
  452. 		case 'f':
  453. 			force = true;
  454. 			interact = false;
  455. 			no_clob = false;
  456. 			break;
  457. 		case 'i':
  458. 			force = false;
  459. 			interact = true;
  460. 			no_clob = false;
  461. 			break;
  462. 		case 'n':
  463. 			force = false;
  464. 			interact = false;
  465. 			no_clob = true;
  466. 			break;
  467. 		case 't':
  468. 			destdir.name = optarg;
  469. 			destdir.sep = "/";
  470. 			destdir.fd = open(optarg, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  472. 			if(destdir.fd < 0)
  473. 			{
  474. 				fprintf(stderr,
  475. 				        "mv: error: Failed opening destination directory '%s': %s\n",
  476. 				        optarg,
  477. 				        strerror(errno));
  478. 				return 1;
  479. 			}
  480. 			break;
  481. 		case 'T':
  482. 			opt_T = true;
  483. 			break;
  484. 		case 'v':
  485. 			verbose = true;
  486. 			break;
  487. 		case ':':
  488. 			fprintf(stderr, "mv: error: Missing operand for option: '-%c'\n", optopt);
  489. 			usage();
  490. 			return 1;
  491. 		case '?':
  492. 			GETOPT_UNKNOWN_OPT
  493. 			usage();
  494. 			return 1;
  495. 		}
  496. 	}
  498. 	argc -= optind;
  499. 	argv += optind;
  501. 	char *lc_all = setlocale(LC_ALL, "");
  502. 	if(lc_all == NULL)
  503. 	{
  504. 		fprintf(stderr,
  505. 		        "%s: warning: Failed loading locales. setlocale(LC_ALL, \"\"): %s\n",
  506. 		        argv0,
  507. 		        strerror(errno));
  508. 	}
  509. 	errno = 0;
  511. 	consent_init();
  513. 	stdin_tty = isatty(STDIN_FILENO);
  514. 	if(!stdin_tty) errno = 0;
  516. 	if(opt_T)
  517. 	{
  518. 		if(destdir.fd != AT_FDCWD)
  519. 		{
  520. 			fprintf(stderr, "mv: error: Cannot pass both -t and -T\n");
  521. 			usage();
  522. 			return 1;
  523. 		}
  525. 		if(argc != 2)
  526. 		{
  527. 			fprintf(stderr, "mv: error: Option -T passed but got %d arguments instead of 2\n", argc);
  528. 			usage();
  529. 			return 1;
  530. 		}
  531. 	}
  533. 	if(destdir.fd == AT_FDCWD)
  534. 	{
  535. 		if(argc <= 1)
  536. 		{
  537. 			fprintf(stderr, "mv: error: Not enough operands, %d given, expect >= 2\n", argc);
  538. 			usage();
  539. 			return 1;
  540. 		}
  542. 		if(opt_T)
  543. 		{
  544. 			int ret = do_renameat(srcdir, argv[0], destdir, argv[1]);
  546. 			consent_finish();
  547. 			return ret < 0 ? 1 : 0;
  548. 		}
  550. 		struct stat dest_status;
  551. 		int ret_stat = fstatat(destdir.fd, argv[1], &dest_status, 0);
  552. 		if(
  553. 		    // clang-format off
  554. 		    argc == 2 && (
  555. 		        (ret_stat != 0 && errno == ENOENT) ||
  556. 		        (ret_stat == 0 && !S_ISDIR(dest_status.st_mode))
  557. 		    )
  558. 		    // clang-format on
  559. 		)
  560. 		{
  561. 			int ret = do_renameat(srcdir, argv[0], destdir, argv[1]);
  563. 			consent_finish();
  564. 			return ret < 0 ? 1 : 0;
  565. 		}
  566. 		errno = 0;
  568. 		argc--;
  569. 		destdir.name = argv[argc];
  570. 		destdir.sep = "/";
  571. 		destdir.fd = open(destdir.name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  572. 		if(destdir.fd < 0)
  573. 		{
  574. 			fprintf(stderr,
  575. 			        "mv: error: Failed opening destination directory '%s': %s\n",
  576. 			        destdir.name,
  577. 			        strerror(errno));
  579. 			consent_finish();
  580. 			return 1;
  581. 		}
  582. 	}
  584. 	for(int i = 0; i < argc; i++)
  585. 	{
  586. 		static char arg[PATH_MAX] = "";
  587. 		lib_strlcpy(arg, argv[i], PATH_MAX);
  589. 		char *filename = basename(arg);
  591. 		if(do_renameat(srcdir, argv[i], destdir, filename) < 0)
  592. 		{
  593. 			consent_finish();
  594. 			return 1;
  595. 		}
  596. 	}
  598. 	consent_finish();
  600. 	if(close(destdir.fd) < 0)
  601. 	{
  602. 		fprintf(
  603. 		    stderr, "mv: error: Failed closing directory '%s': %s\n", destdir.name, strerror(errno));
  604. 		return 1;
  605. 	}
  607. 	return 0;
  608. }