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utils-std

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

chmod.c (9457B)

    

  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
  7. // NetBSD <10 hides fdopendir behind _NETBSD_SOURCE
  8. #if __NetBSD_Version__ < 1000000000
  9. #define _NETBSD_SOURCE
  10. #endif
  12. #include "../config.h" // HAS_*
  13. #include "../lib/mode.h"
  15. #include <dirent.h> // fdopendir, readdir, closedir
  16. #include <errno.h>
  17. #include <fcntl.h>  // AT_FDCWD
  18. #include <limits.h> // PATH_MAX
  19. #include <stdbool.h>
  20. #include <stdio.h>    // fprintf
  21. #include <string.h>   // strerror
  22. #include <sys/stat.h> // chmod, fstatat, S_ISDIR
  23. #include <unistd.h>   // getopt
  24. #ifdef HAS_GETOPT_LONG
  25. #include <getopt.h>
  26. #endif
  28. const char *argv0 = "chmod";
  29. bool opt_c = false, opt_v = false;
  31. static int
  32. do_fchmodat(int fd, char *mode_arg, char *name, char *acc_path, bool recursive)
  33. {
  34. 	struct stat stats;
  35. 	int err = 0;
  37. 	if(fstatat(fd, name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
  38. 	{
  39. 		fprintf(stderr,
  40. 		        "%s: error: Failed getting status for '%s': %s\n",
  41. 		        argv0,
  42. 		        acc_path,
  43. 		        strerror(errno));
  44. 		errno = 0;
  45. 		return 1;
  46. 	}
  48. 	const char *errstr = NULL;
  49. 	mode_t mode = new_mode(mode_arg, stats.st_mode, &errstr);
  50. 	if(errstr != NULL)
  51. 	{
  52. 		fprintf(stderr, "%s: error: Failed parsing mode '%s': %s\n", argv0, mode_arg, errstr);
  53. 		return 1;
  54. 	}
  56. 	char mode_from[11] = "";
  57. 	symbolize_mode(stats.st_mode, mode_from);
  59. 	if(mode != stats.st_mode)
  60. 	{
  61. 		if(fchmodat(fd, name, mode, 0) != 0)
  62. 		{
  63. 			fprintf(stderr,
  64. 			        "%s: error: Failed setting permissions to 0%04o for '%s': %s\n",
  65. 			        argv0,
  66. 			        mode,
  67. 			        acc_path,
  68. 			        strerror(errno));
  69. 			errno = 0;
  70. 			return 1;
  71. 		}
  73. 		if(opt_c || opt_v)
  74. 		{
  75. 			char mode_to[11] = "";
  76. 			symbolize_mode(mode, mode_to);
  78. 			printf("%s: Permissions changed from 0%04o/%s to 0%04o/%s for '%s'\n",
  79. 			       argv0,
  80. 			       stats.st_mode & 07777,
  81. 			       mode_from,
  82. 			       mode & 07777,
  83. 			       mode_to,
  84. 			       acc_path);
  85. 		}
  86. 	}
  87. 	else if(opt_v)
  88. 		printf("%s: Permissions already set to 0%04o/%s for '%s'\n",
  89. 		       argv0,
  90. 		       stats.st_mode & 07777,
  91. 		       mode_from,
  92. 		       acc_path);
  94. 	if(recursive && S_ISDIR(stats.st_mode))
  95. 	{
  96. 		int dir = openat(fd, name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  97. 		if(dir == -1)
  98. 		{
  99. 			fprintf(stderr,
  100. 			        "%s: error: Couldn't open '%s' as directory: %s\n",
  101. 			        argv0,
  102. 			        acc_path,
  103. 			        strerror(errno));
  104. 			errno = 0;
  105. 			return 1;
  106. 		}
  108. 		DIR *dirp = fdopendir(dir);
  109. 		if(dirp == NULL)
  110. 		{
  111. 			fprintf(stderr,
  112. 			        "%s: error: Couldn't get DIR entry for opened '%s': %s\n",
  113. 			        argv0,
  114. 			        acc_path,
  115. 			        strerror(errno));
  116. 			errno = 0;
  117. 			return 1;
  118. 		}
  120. 		while(true)
  121. 		{
  122. 			struct dirent *dp = readdir(dirp);
  123. 			if(dp == NULL)
  124. 			{
  125. 				if(errno == 0) break;
  127. 				fprintf(stderr,
  128. 				        "%s: error: Failed reading directory '%s': %s\n",
  129. 				        argv0,
  130. 				        acc_path,
  131. 				        strerror(errno));
  132. 				closedir(dirp); // FIXME: unhandled error
  133. 				errno = 0;
  134. 				return 1;
  135. 			}
  137. 			if(strcmp(dp->d_name, ".") == 0) continue;
  138. 			if(strcmp(dp->d_name, "..") == 0) continue;
  140. 			char new_path[PATH_MAX] = "";
  141. 			if(snprintf(new_path, PATH_MAX, "%s/%s", acc_path, dp->d_name) < 0)
  142. 			{
  143. 				fprintf(
  144. 				    stderr,
  145. 				    "%s: error: Couldn't concatenate '%s' into parent '%s', skipping to next entry: %s\n",
  146. 				    argv0,
  147. 				    name,
  148. 				    acc_path,
  149. 				    strerror(errno));
  150. 				err++;
  151. 				errno = 0;
  152. 				continue;
  153. 			}
  155. 			// No depth counter for now, unlikely to be a problem
  156. 			int ret = do_fchmodat(dir, mode_arg, dp->d_name, new_path, true);
  157. 			if(ret != 0) return ret;
  158. 		}
  160. 		// fdopendir allocates memory for DIR, needs closedir
  161. 		if(closedir(dirp) != 0)
  162. 		{
  163. 			fprintf(stderr,
  164. 			        "%s: error: Deallocating directory entry for '%s' failed: %s\n",
  165. 			        argv0,
  166. 			        acc_path,
  167. 			        strerror(errno));
  168. 			errno = 0;
  169. 			return 1;
  170. 		}
  171. 	}
  173. 	return err;
  174. }
  176. static int
  177. copy_mode(int fd, mode_t mode, char *name, char *acc_path, bool recursive)
  178. {
  179. 	struct stat stats;
  180. 	int err = 0;
  182. 	if(fstatat(fd, name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
  183. 	{
  184. 		fprintf(stderr,
  185. 		        "%s: error: Failed getting status for '%s': %s\n",
  186. 		        argv0,
  187. 		        acc_path,
  188. 		        strerror(errno));
  189. 		errno = 0;
  190. 		return 1;
  191. 	}
  193. 	char mode_from[11] = "";
  194. 	symbolize_mode(stats.st_mode, mode_from);
  196. 	if(mode != stats.st_mode)
  197. 	{
  198. 		if(fchmodat(fd, name, mode, 0) != 0)
  199. 		{
  200. 			fprintf(stderr,
  201. 			        "%s: error: Failed setting permissions to 0%04o for '%s': %s\n",
  202. 			        argv0,
  203. 			        mode,
  204. 			        acc_path,
  205. 			        strerror(errno));
  206. 			errno = 0;
  207. 			return 1;
  208. 		}
  210. 		if(opt_c || opt_v)
  211. 		{
  212. 			char mode_to[11] = "";
  213. 			symbolize_mode(mode, mode_to);
  215. 			printf("%s: Permissions changed from 0%04o/%s to 0%04o/%s for '%s'\n",
  216. 			       argv0,
  217. 			       stats.st_mode & 07777,
  218. 			       mode_from,
  219. 			       mode & 07777,
  220. 			       mode_to,
  221. 			       acc_path);
  222. 		}
  223. 	}
  224. 	else if(opt_v)
  225. 		printf("%s: Permissions already set to 0%04o/%s for '%s'\n",
  226. 		       argv0,
  227. 		       stats.st_mode & 07777,
  228. 		       mode_from,
  229. 		       acc_path);
  231. 	if(recursive && S_ISDIR(stats.st_mode))
  232. 	{
  233. 		int dir = openat(fd, name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
  234. 		if(dir == -1)
  235. 		{
  236. 			fprintf(stderr,
  237. 			        "%s: error: Couldn't open '%s' as directory: %s\n",
  238. 			        argv0,
  239. 			        acc_path,
  240. 			        strerror(errno));
  241. 			errno = 0;
  242. 			return 1;
  243. 		}
  245. 		DIR *dirp = fdopendir(dir);
  246. 		if(dirp == NULL)
  247. 		{
  248. 			fprintf(stderr,
  249. 			        "%s: error: Couldn't get DIR entry for opened '%s': %s\n",
  250. 			        argv0,
  251. 			        acc_path,
  252. 			        strerror(errno));
  253. 			errno = 0;
  254. 			return 1;
  255. 		}
  257. 		while(true)
  258. 		{
  259. 			struct dirent *dp = readdir(dirp);
  260. 			if(dp == NULL)
  261. 			{
  262. 				if(errno == 0) break;
  264. 				fprintf(stderr,
  265. 				        "%s: error: Failed reading directory '%s': %s\n",
  266. 				        argv0,
  267. 				        acc_path,
  268. 				        strerror(errno));
  269. 				closedir(dirp); // FIXME: unhandled error
  270. 				errno = 0;
  271. 				return 1;
  272. 			}
  274. 			if(strcmp(dp->d_name, ".") == 0) continue;
  275. 			if(strcmp(dp->d_name, "..") == 0) continue;
  277. 			char new_path[PATH_MAX] = "";
  278. 			if(snprintf(new_path, PATH_MAX, "%s/%s", acc_path, dp->d_name) < 0)
  279. 			{
  280. 				fprintf(
  281. 				    stderr,
  282. 				    "%s: error: Couldn't concatenate '%s' into parent '%s', skipping to next entry: %s\n",
  283. 				    argv0,
  284. 				    name,
  285. 				    acc_path,
  286. 				    strerror(errno));
  287. 				err++;
  288. 				errno = 0;
  289. 				continue;
  290. 			}
  292. 			// No depth counter for now, unlikely to be a problem
  293. 			int ret = copy_mode(dir, mode, dp->d_name, new_path, true);
  294. 			if(ret != 0) return ret;
  295. 		}
  297. 		// fdopendir allocates memory for DIR, needs closedir
  298. 		if(closedir(dirp) != 0)
  299. 		{
  300. 			fprintf(stderr,
  301. 			        "%s: error: Deallocating directory entry for '%s' failed: %s\n",
  302. 			        argv0,
  303. 			        acc_path,
  304. 			        strerror(errno));
  305. 			errno = 0;
  306. 			return 1;
  307. 		}
  308. 	}
  310. 	return err;
  311. }
  313. static void
  314. usage(void)
  315. {
  316. 	fprintf(stderr, "\
  317. Usage: chmod [-cRv] <mode> <file...>\n\
  318.        chmod [-cRv] -F <ref_file> <file...>\n");
  319. }
  321. int
  322. main(int argc, char *argv[])
  323. {
  324. 	bool opt_R = false;
  325. 	char *ref_file = NULL;
  327. #ifdef HAS_GETOPT_LONG
  328. 	// Strictly for GNUisms compatibility so no long-only options
  329. 	// clang-format off
  330. 	static struct option opts[] = {
  331. 		{"changes", no_argument, 0, 'c'},
  332. 		{"recursive", no_argument, 0, 'R'},
  333. 		{"reference", required_argument, 0, 'F'},
  334. 		{"verbose", no_argument, 0, 'v'},
  335. 		{0, 0, 0, 0},
  336. 	};
  337. 	// clang-format on
  338. #endif
  340. 	for(int c = -1;;)
  341. 	{
  342. 		if(optind >= argc || !argv[optind]) break;
  344. 		if(argv[optind][0] == '-' && strchr("rwxugoa", argv[optind][1]))
  345. 		{
  346. 			fprintf(stderr,
  347. 			        "%s: warning: (portability) Pass -- before a mode with a leading dash(-) to "
  348. 			        "separate it from options\n",
  349. 			        argv0);
  350. 			break;
  351. 		}
  353. #ifdef HAS_GETOPT_LONG
  354. 		// Need + as first character to get POSIX-style option parsing
  355. 		c = getopt_long(argc, argv, "+:cF:Rv", opts, NULL);
  356. #else
  357. 		c = getopt(argc, argv, ":cF:Rv");
  358. #endif
  359. 		if(c == -1) break;
  361. 		switch(c)
  362. 		{
  363. 		case 'c': // GNU
  364. 			opt_c = true;
  365. 			break;
  366. 		case 'F': // GNU & NetBSD for --reference, utils-std for -F
  367. 			ref_file = optarg;
  368. 			break;
  369. 		case 'R': // POSIX
  370. 			opt_R = true;
  371. 			break;
  372. 		case 'v': // GNU
  373. 			opt_v = true;
  374. 			break;
  375. 		case ':':
  376. 			fprintf(stderr, "%s: error: Missing operand for option: '-%c'\n", argv0, optopt);
  377. 			usage();
  378. 			return 1;
  379. 		case '?': // GNU
  380. 			fprintf(stderr, "%s: error: Unrecognised option: '-%c'\n", argv0, optopt);
  381. 			usage();
  382. 			return 1;
  383. 		}
  384. 	}
  386. 	argc -= optind;
  387. 	argv += optind;
  389. 	if(ref_file != NULL)
  390. 	{
  391. 		if(argc < 1)
  392. 		{
  393. 			fprintf(stderr, "%s: error: Expected >=1 arguments, %d given\n", argv0, argc);
  394. 			usage();
  395. 			return 1;
  396. 		}
  398. 		struct stat ref_stat;
  399. 		if(stat(ref_file, &ref_stat) != 0)
  400. 		{
  401. 			fprintf(stderr,
  402. 			        "%s: error: Failed to get status from reference file '%s': %s\n",
  403. 			        argv0,
  404. 			        ref_file,
  405. 			        strerror(errno));
  406. 			return 1;
  407. 		}
  409. 		for(int i = 0; i < argc; i++)
  410. 		{
  411. 			int ret = copy_mode(AT_FDCWD, ref_stat.st_mode, argv[i], argv[i], opt_R);
  412. 			if(ret != 0) return ret;
  413. 		}
  415. 		return 0;
  416. 	}
  418. 	if(argc < 2)
  419. 	{
  420. 		fprintf(stderr, "%s: error: Expected >=2 arguments, %d given\n", argv0, argc);
  421. 		usage();
  422. 		return 1;
  423. 	}
  425. 	for(int i = 1; i < argc; i++)
  426. 	{
  427. 		int ret = do_fchmodat(AT_FDCWD, argv[0], argv[i], argv[i], opt_R);
  428. 		if(ret != 0) return ret;
  429. 	}
  431. 	return 0;
  432. }