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utils-std

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

install.c (7354B)

    

  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/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/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. static int
  40. do_install(char *src, char *dest, bool is_dir)
  41. {
  42. 	assert(errno == 0);
  43. 	int src_fd = open(src, O_RDONLY);
  44. 	if(src_fd < 0)
  45. 	{
  46. 		fprintf(stderr, "%s: Failed opening file '%s' for reading: %s\n", argv0, src, strerror(errno));
  47. 		return -1;
  48. 	}
  50. 	struct stat src_stat;
  51. 	if(fstat(src_fd, &src_stat) < 0)
  52. 	{
  53. 		fprintf(
  54. 		    stderr, "%s: Failed getting status for source '%s': %s\n", argv0, dest, strerror(errno));
  55. 		return -1;
  56. 	}
  58. 	if(!is_dir)
  59. 	{
  60. 		assert(errno == 0);
  61. 		struct stat dest_stat;
  62. 		if(stat(dest, &dest_stat) < 0)
  63. 		{
  64. 			if(errno != ENOENT)
  65. 			{
  66. 				fprintf(stderr,
  67. 				        "%s: Failed getting status for destination '%s': %s\n",
  68. 				        argv0,
  69. 				        dest,
  70. 				        strerror(errno));
  71. 				return -1;
  72. 			}
  73. 			else
  74. 				errno = 0;
  75. 		}
  76. 		else
  77. 		{
  78. 			if(S_ISDIR(dest_stat.st_mode))
  79. 			{
  80. 				is_dir = true;
  81. 			}
  82. 			else
  83. 			{
  84. 				if(unlink(dest) < 0)
  85. 				{
  86. 					fprintf(stderr,
  87. 					        "%s: Failed removing existing file at destination '%s': %s\n",
  88. 					        argv0,
  89. 					        dest,
  90. 					        strerror(errno));
  91. 					return -1;
  92. 				}
  93. 			}
  94. 		}
  95. 	}
  97. 	assert(errno == 0);
  99. 	char *dest_path = dest;
  101. 	if(is_dir)
  102. 	{
  103. 		char target[PATH_MAX] = "";
  104. 		char *src_basename = static_basename(src);
  106. 		if(snprintf(target, PATH_MAX, "%s/%s", dest, src_basename) < 0)
  107. 		{
  108. 			fprintf(stderr,
  109. 			        "%s: Failed joining destination '%s' and source '%s'\n",
  110. 			        argv0,
  111. 			        dest,
  112. 			        src_basename);
  113. 			return -1;
  114. 		}
  116. 		dest_path = target;
  117. 	}
  119. 	assert(errno == 0);
  121. 	int dest_fd = open(dest_path, O_CREAT | O_WRONLY | O_TRUNC, mode);
  122. 	if(dest_fd < 0)
  123. 	{
  124. 		fprintf(stderr,
  125. 		        "%s: Failed create-opening file '%s' for writing: %s\n",
  126. 		        argv0,
  127. 		        dest_path,
  128. 		        strerror(errno));
  129. 		return -1;
  130. 	}
  132. 	if(auto_file_copy(src_fd, dest_fd, src_stat.st_size, 0) < 0)
  133. 	{
  134. 		fprintf(stderr,
  135. 		        "%s: Error: Failed copying data from '%s' to '%s': %s\n",
  136. 		        argv0,
  137. 		        src,
  138. 		        dest_path,
  139. 		        strerror(errno));
  140. 		return -1;
  141. 	}
  143. 	assert(errno == 0);
  145. 	if(user != (uid_t)-1 || group != (gid_t)-1)
  146. 		if(fchown(dest_fd, user, group) < 0)
  147. 		{
  148. 			fprintf(stderr,
  149. 			        "%s: Error: Failed changing ownership of '%s': %s\n",
  150. 			        argv0,
  151. 			        dest_path,
  152. 			        strerror(errno));
  153. 			return -1;
  154. 		}
  156. 	assert(errno == 0);
  158. 	if(preserve_times)
  159. 	{
  160. 		struct timespec src_times[2] = {src_stat.st_atim, src_stat.st_mtim};
  161. 		if(futimens(dest_fd, src_times) != 0)
  162. 		{
  163. 			fprintf(stderr,
  164. 			        "%s: Error while setting access/modification times on '%s': %s\n",
  165. 			        argv0,
  166. 			        dest_path,
  167. 			        strerror(errno));
  168. 			return -1;
  169. 		}
  170. 	}
  172. 	if(close(src_fd) < 0)
  173. 	{
  174. 		fprintf(stderr, "%s: Error closing '%s'\n", argv0, src);
  175. 		return -1;
  176. 	}
  178. 	if(close(dest_fd) < 0)
  179. 	{
  180. 		fprintf(stderr, "%s: Error closing '%s'\n", argv0, dest_path);
  181. 		return -1;
  182. 	}
  184. 	assert(errno == 0);
  186. 	return 0;
  187. }
  189. static void
  190. usage(void)
  191. {
  192. 	fprintf(stderr, "\
  193. Usage: install [-CcDpT] [-g group] [-m mode] [-o owner] source... destination\n\
  194.        install [-CcDpT] [-g group] [-m mode] [-o owner] -t destination source...\n\
  195.        install -d [-c] [-g group] [-m mode] [-o owner] directory...\n\
  196. ");
  197. }
  199. int
  200. main(int argc, char *argv[])
  201. {
  202. 	const char *errstr = NULL;
  203. 	bool create_parents = false;
  204. 	bool opt_T = false;
  205. 	char *dest = NULL;
  207. 	mkdir_parents_filemask = umask(0);
  208. 	umask(mkdir_parents_filemask);
  210. 	int c = -1;
  211. #ifdef HAS_GETOPT_LONG
  212. 	// Strictly for GNUisms compatibility so no long-only options
  213. 	// clang-format off
  214. 	static struct option opts[] = {
  215. 		{"compare", no_argument, 0, 'c'},
  216. 		{"directory", no_argument, 0, 'd'},
  217. 		{"group", required_argument, 0, 'g'},
  218. 		{"mode", required_argument, 0, 'm'},
  219. 		{"owner", required_argument, 0, 'o'},
  220. 		{"preserve-timestamps", no_argument, 0, 'p'},
  221. 		{"target-directory", required_argument, 0, 't'},
  222. 		{"no-target-directory", no_argument, 0, 'T'},
  223. 		{0, 0, 0, 0},
  224. 	};
  225. 	// clang-format on
  227. 	// Need + as first character to get POSIX-style option parsing
  228. 	while((c = getopt_long(argc, argv, "+:CcDdpTt:g:m:o:", opts, NULL)) != -1)
  229. #else
  230. 	while((c = getopt(argc, argv, ":CcDdpTt:g:m:o:")) != -1)
  231. #endif
  232. 	{
  233. 		switch(c)
  234. 		{
  235. 		case 'C':
  236. 			// ignore, for compatibility
  237. 			break;
  238. 		case 'c':
  239. 			// ignore, modern default behavior
  240. 			break;
  241. 		case 'D':
  242. 			create_parents = true;
  243. 			break;
  244. 		case 'd':
  245. 			create_directories = true;
  246. 			break;
  247. 		case 'p':
  248. 			preserve_times = true;
  249. 			break;
  250. 		case 'g':
  251. 			if(parse_group(optarg, &group) != 0) return 1;
  252. 			break;
  253. 		case 'o':
  254. 			if(parse_group(optarg, &user) != 0) return 1;
  255. 			break;
  256. 		case 'T':
  257. 			opt_T = true;
  258. 			break;
  259. 		case 't':
  260. 			dest = optarg;
  261. 			break;
  262. 		case 'm':
  263. 			mode = new_mode(optarg, 0755, &errstr);
  264. 			if(errstr != NULL)
  265. 			{
  266. 				fprintf(stderr, "install: Failed parsing mode '%s': %s\n", optarg, errstr);
  267. 				return 1;
  268. 			}
  269. 			break;
  270. 		case ':':
  271. 			fprintf(stderr, "install: Missing operand for option: '-%c'\n", optopt);
  272. 			usage();
  273. 			return 1;
  274. 		case '?':
  275. 			fprintf(stderr, "install: Unknown option '-%c'\n", optopt);
  276. 			usage();
  277. 			return 1;
  278. 		}
  279. 	}
  281. 	assert(errno == 0);
  283. 	argc -= optind;
  284. 	argv += optind;
  286. 	if(create_directories)
  287. 	{
  288. 		for(int i = 0; i < argc; i++)
  289. 		{
  290. 			char *dest = argv[i];
  292. 			if(mkdir_parents(dest, mode) != 0) return -1;
  294. 			if(user != (uid_t)-1 || group != (gid_t)-1)
  295. 			{
  296. 				if(chown(dest, user, group) < 0)
  297. 				{
  298. 					fprintf(stderr,
  299. 					        "%s: Error: Failed changing ownership of '%s': %s\n",
  300. 					        argv0,
  301. 					        dest,
  302. 					        strerror(errno));
  303. 					return -1;
  304. 				}
  305. 			}
  306. 		}
  308. 		return 0;
  309. 	}
  311. 	if(dest == NULL) dest = argv[--argc];
  312. 	bool multi_src = argc > 1;
  314. 	if(opt_T)
  315. 	{
  316. 		if(argc != 1)
  317. 		{
  318. 			fprintf(
  319. 			    stderr, "%s: Option -T passed, expected exactly 1 source operand, got %d\n", argv0, argc);
  320. 			return 1;
  321. 		}
  323. 		assert(!multi_src);
  324. 	}
  325. 	else if(argc < 1)
  326. 	{
  327. 		fprintf(stderr, "%s: Expected at least 1 source operand\n", argv0);
  328. 		return 1;
  329. 	}
  331. 	if(create_parents)
  332. 	{
  333. 		char *destdir = dest;
  334. 		// Same as in mkdir_parents
  335. 		mode_t parent_mode = (S_IWUSR | S_IXUSR | ~mkdir_parents_filemask) & 0777;
  337. 		if(!multi_src)
  338. 		{
  339. 			char path_dup[PATH_MAX] = "";
  340. 			strncpy(path_dup, dest, PATH_MAX);
  342. 			destdir = dirname(path_dup);
  343. 		}
  345. 		if(mkdir_parents(destdir, parent_mode) != 0) return 1;
  346. 	}
  348. 	for(int i = 0; i < argc; i++)
  349. 	{
  350. 		char *src = argv[i];
  351. 		if(do_install(src, dest, multi_src) < 0) return 1;
  352. 	}
  354. 	return 0;
  355. }