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utils-std

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

install.c (7833B)

    

  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. // For copy_file_range
  6. #define _GNU_SOURCE     // musl, glibc
  7. #define _DEFAULT_SOURCE // FreeBSD
  9. #include "../lib/fs.h"
  10. #include "../lib/lib_mkdir.h"
  11. #include "../lib/mode.h"
  12. #include "../lib/user_group_parse.h"
  14. #include <assert.h>
  15. #include <errno.h>
  16. #include <fcntl.h>  // linkat, AT_SYMLINK_FOLLOW
  17. #include <libgen.h> // dirname
  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>
  23. #include <unistd.h> // getopt
  24. #ifdef HAS_GETOPT_LONG
  25. #include <getopt.h>
  26. #endif
  28. bool preserve_times = false, create_directories = false;
  30. // See lib/lib_mkdir.c
  31. bool mkdir_parents_verbose = false;
  32. mode_t mkdir_parents_filemask;
  34. mode_t mode = 00755;
  35. uid_t user = (uid_t)-1;
  36. gid_t group = (gid_t)-1;
  37. const char *argv0 = "install";
  39. bool opt_v = false;
  41. static int
  42. do_install(char *src, char *dest, bool is_dir)
  43. {
  44. 	assert(errno == 0);
  45. 	int src_fd = open(src, O_RDONLY);
  46. 	if(src_fd < 0)
  47. 	{
  48. 		fprintf(stderr,
  49. 		        "%s: error: Failed opening file '%s' for reading: %s\n",
  50. 		        argv0,
  51. 		        src,
  52. 		        strerror(errno));
  53. 		return -1;
  54. 	}
  56. 	struct stat src_stat;
  57. 	if(fstat(src_fd, &src_stat) < 0)
  58. 	{
  59. 		fprintf(stderr,
  60. 		        "%s: error: Failed getting status for source '%s': %s\n",
  61. 		        argv0,
  62. 		        dest,
  63. 		        strerror(errno));
  64. 		return -1;
  65. 	}
  67. 	if(!is_dir)
  68. 	{
  69. 		assert(errno == 0);
  70. 		struct stat dest_stat;
  71. 		if(stat(dest, &dest_stat) < 0)
  72. 		{
  73. 			if(errno != ENOENT)
  74. 			{
  75. 				fprintf(stderr,
  76. 				        "%s: error: Failed getting status for destination '%s': %s\n",
  77. 				        argv0,
  78. 				        dest,
  79. 				        strerror(errno));
  80. 				return -1;
  81. 			}
  82. 			else
  83. 				errno = 0;
  84. 		}
  85. 		else
  86. 		{
  87. 			if(S_ISDIR(dest_stat.st_mode))
  88. 			{
  89. 				is_dir = true;
  90. 			}
  91. 			else
  92. 			{
  93. 				if(unlink(dest) < 0)
  94. 				{
  95. 					fprintf(stderr,
  96. 					        "%s: error: Failed removing existing file at destination '%s': %s\n",
  97. 					        argv0,
  98. 					        dest,
  99. 					        strerror(errno));
  100. 					return -1;
  101. 				}
  102. 			}
  103. 		}
  104. 	}
  106. 	assert(errno == 0);
  108. 	char *dest_path = dest;
  110. 	if(is_dir)
  111. 	{
  112. 		static char target[PATH_MAX] = "";
  113. 		char *src_basename = static_basename(src);
  115. 		if(snprintf(target, PATH_MAX, "%s/%s", dest, src_basename) < 0)
  116. 		{
  117. 			fprintf(stderr,
  118. 			        "%s: error: Failed joining destination '%s' and source '%s'\n",
  119. 			        argv0,
  120. 			        dest,
  121. 			        src_basename);
  122. 			return -1;
  123. 		}
  125. 		dest_path = target;
  126. 	}
  128. 	assert(errno == 0);
  130. 	int dest_fd = open(dest_path, O_CREAT | O_WRONLY | O_TRUNC, mode);
  131. 	if(dest_fd < 0)
  132. 	{
  133. 		fprintf(stderr,
  134. 		        "%s: error: Failed create-opening file '%s' for writing: %s\n",
  135. 		        argv0,
  136. 		        dest_path,
  137. 		        strerror(errno));
  138. 		return -1;
  139. 	}
  141. 	if(opt_v) fprintf(stderr, "%s: Made file: %s\n", argv0, dest);
  143. 	if(auto_file_copy(src_fd, dest_fd, src_stat.st_size, 0) < 0)
  144. 	{
  145. 		fprintf(stderr,
  146. 		        "%s: error: Failed copying data from '%s' to '%s': %s\n",
  147. 		        argv0,
  148. 		        src,
  149. 		        dest_path,
  150. 		        strerror(errno));
  151. 		return -1;
  152. 	}
  154. 	assert(errno == 0);
  156. 	if(user != (uid_t)-1 || group != (gid_t)-1)
  157. 		if(fchown(dest_fd, user, group) < 0)
  158. 		{
  159. 			fprintf(stderr,
  160. 			        "%s: error: Failed changing ownership of '%s': %s\n",
  161. 			        argv0,
  162. 			        dest_path,
  163. 			        strerror(errno));
  164. 			return -1;
  165. 		}
  167. 	assert(errno == 0);
  169. 	if(preserve_times)
  170. 	{
  171. 		struct timespec src_times[2] = {src_stat.st_atim, src_stat.st_mtim};
  172. 		if(futimens(dest_fd, src_times) != 0)
  173. 		{
  174. 			fprintf(stderr,
  175. 			        "%s: error: Failed setting access/modification times on '%s': %s\n",
  176. 			        argv0,
  177. 			        dest_path,
  178. 			        strerror(errno));
  179. 			return -1;
  180. 		}
  181. 	}
  183. 	if(close(src_fd) < 0)
  184. 	{
  185. 		fprintf(stderr, "%s: error: Failed closing '%s'\n", argv0, src);
  186. 		return -1;
  187. 	}
  189. 	if(close(dest_fd) < 0)
  190. 	{
  191. 		fprintf(stderr, "%s: error: Failed closing '%s'\n", argv0, dest_path);
  192. 		return -1;
  193. 	}
  195. 	assert(errno == 0);
  197. 	return 0;
  198. }
  200. static void
  201. usage(void)
  202. {
  203. 	fprintf(stderr, "\
  204. Usage: install [-CcDpTv] [-g group] [-m mode] [-o owner] source... destination\n\
  205.        install [-CcDpTv] [-g group] [-m mode] [-o owner] -t destination source...\n\
  206.        install -d [-cv] [-g group] [-m mode] [-o owner] directory...\n\
  207. ");
  208. }
  210. int
  211. main(int argc, char *argv[])
  212. {
  213. 	const char *errstr = NULL;
  214. 	bool create_parents = false;
  215. 	bool opt_T = false;
  216. 	char *dest = NULL;
  218. 	mkdir_parents_filemask = umask(0);
  219. 	umask(mkdir_parents_filemask);
  221. 	int c = -1;
  222. #ifdef HAS_GETOPT_LONG
  223. 	// Strictly for GNUisms compatibility so no long-only options
  224. 	// clang-format off
  225. 	static struct option opts[] = {
  226. 		{"compare", no_argument, 0, 'c'},
  227. 		{"directory", no_argument, 0, 'd'},
  228. 		{"group", required_argument, 0, 'g'},
  229. 		{"mode", required_argument, 0, 'm'},
  230. 		{"owner", required_argument, 0, 'o'},
  231. 		{"preserve-timestamps", no_argument, 0, 'p'},
  232. 		{"target-directory", required_argument, 0, 't'},
  233. 		{"no-target-directory", no_argument, 0, 'T'},
  234. 		{"verbose", no_argument, 0, 'v'},
  235. 		{0, 0, 0, 0},
  236. 	};
  237. 	// clang-format on
  239. 	// Need + as first character to get POSIX-style option parsing
  240. 	while((c = getopt_long(argc, argv, "+:CcDdpTt:g:m:o:v", opts, NULL)) != -1)
  241. #else
  242. 	while((c = getopt(argc, argv, ":CcDdpTt:g:m:o:v")) != -1)
  243. #endif
  244. 	{
  245. 		switch(c)
  246. 		{
  247. 		case 'C':
  248. 			// ignore, for compatibility
  249. 			break;
  250. 		case 'c':
  251. 			// ignore, modern default behavior
  252. 			break;
  253. 		case 'D':
  254. 			create_parents = true;
  255. 			break;
  256. 		case 'd':
  257. 			create_directories = true;
  258. 			break;
  259. 		case 'p':
  260. 			preserve_times = true;
  261. 			break;
  262. 		case 'g':
  263. 			if(parse_group(optarg, &group) != 0) return 1;
  264. 			break;
  265. 		case 'o':
  266. 			if(parse_group(optarg, &user) != 0) return 1;
  267. 			break;
  268. 		case 'T':
  269. 			opt_T = true;
  270. 			break;
  271. 		case 't':
  272. 			dest = optarg;
  273. 			break;
  274. 		case 'm':
  275. 			mode = new_mode(optarg, 0755, &errstr);
  276. 			if(errstr != NULL)
  277. 			{
  278. 				fprintf(stderr, "install: error: Failed parsing mode '%s': %s\n", optarg, errstr);
  279. 				return 1;
  280. 			}
  281. 			break;
  282. 		case 'v':
  283. 			opt_v = true;
  284. 			mkdir_parents_verbose = true;
  285. 			break;
  286. 		case ':':
  287. 			fprintf(stderr, "install: error: Missing operand for option: '-%c'\n", optopt);
  288. 			usage();
  289. 			return 1;
  290. 		case '?':
  291. 			fprintf(stderr, "install: error: Unknown option '-%c'\n", optopt);
  292. 			usage();
  293. 			return 1;
  294. 		}
  295. 	}
  297. 	assert(errno == 0);
  299. 	argc -= optind;
  300. 	argv += optind;
  302. 	if(create_directories)
  303. 	{
  304. 		for(int i = 0; i < argc; i++)
  305. 		{
  306. 			char *dest = argv[i];
  308. 			if(mkdir_parents(dest, mode) != 0) return -1;
  310. 			if(opt_v) fprintf(stderr, "%s: Made directory: %s\n", argv0, dest);
  312. 			if(user != (uid_t)-1 || group != (gid_t)-1)
  313. 			{
  314. 				if(chown(dest, user, group) < 0)
  315. 				{
  316. 					fprintf(stderr,
  317. 					        "%s: error: Failed changing ownership of '%s': %s\n",
  318. 					        argv0,
  319. 					        dest,
  320. 					        strerror(errno));
  321. 					return -1;
  322. 				}
  323. 			}
  324. 		}
  326. 		return 0;
  327. 	}
  329. 	if(dest == NULL) dest = argv[--argc];
  330. 	bool multi_src = argc > 1;
  332. 	if(opt_T)
  333. 	{
  334. 		if(argc != 1)
  335. 		{
  336. 			fprintf(stderr,
  337. 			        "%s: error: Option -T passed, expected exactly 1 source operand, got %d\n",
  338. 			        argv0,
  339. 			        argc);
  340. 			return 1;
  341. 		}
  343. 		assert(!multi_src);
  344. 	}
  345. 	else if(argc < 1)
  346. 	{
  347. 		fprintf(stderr, "%s: error: Expected at least 1 source operand\n", argv0);
  348. 		return 1;
  349. 	}
  351. 	if(create_parents)
  352. 	{
  353. 		char *destdir = dest;
  354. 		// Same as in mkdir_parents
  355. 		mode_t parent_mode = (S_IWUSR | S_IXUSR | ~mkdir_parents_filemask) & 0777;
  357. 		if(!multi_src)
  358. 		{
  359. 			char path_dup[PATH_MAX] = "";
  360. 			strncpy(path_dup, dest, PATH_MAX);
  362. 			destdir = dirname(path_dup);
  363. 		}
  365. 		if(mkdir_parents(destdir, parent_mode) != 0) return 1;
  366. 	}
  368. 	for(int i = 0; i < argc; i++)
  369. 	{
  370. 		char *src = argv[i];
  371. 		if(do_install(src, dest, multi_src) < 0) return 1;
  372. 	}
  374. 	return 0;
  375. }