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utils-std

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

df.c (9458B)

    

  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 _DEFAULT_SOURCE // mntent in glibc 2.19+
  8. #include "../lib/humanize.h"
  10. #include <assert.h>
  11. #include <ctype.h> // iscntrl, isspace
  12. #include <errno.h> // errno
  13. #include <mntent.h>
  14. #include <stdbool.h>
  15. #include <stdio.h>    // printf
  16. #include <stdlib.h>   // abort, exit
  17. #include <string.h>   // strerror
  18. #include <sys/stat.h> // stat, dev_t
  19. #include <sys/statvfs.h>
  20. #include <unistd.h> // getopt
  22. // Grabbed from OpenRC rc-functions.sh
  23. // clang-format off
  24. static const char *net_fs_list[] = {
  25. 	"afs", "ceph", "cifs", "coda", "davfs", "fuse", "fuse.glusterfs",
  26. 	"fuse.sshfs", "gfs", "glusterfs", "lustre", "ncpfs", "nfs", "nfs4",
  27. 	"ocfs2", "shfs", "smbfs"
  28. };
  29. // clang-format on
  31. blksize_t forced_bsize = 0;
  32. const char *argv0 = "df";
  34. // Replaces control characters and whitespaces with '?' in-place (no allocation)
  35. static void
  36. static_escape(char *str)
  37. {
  38. 	for(size_t i = 0; i < strlen(str); i++)
  39. 		if(iscntrl(str[i]) || isspace(str[i])) str[i] = '?';
  40. }
  42. int
  43. main(int argc, char *argv[])
  44. {
  45. 	bool opt_P = false, opt_h = false, opt_a = false, opt_T = false, opt_l = false, opt_i = false;
  46. 	int fs_col_width = 20;
  48. 	size_t excluded_count = 0;
  49. 	char *excluded[4096];
  51. 	size_t only_count = 0;
  52. 	char *only[4096];
  54. 	int c = -1;
  55. 	while((c = getopt(argc, argv, ":ahilPkTt:x:")) != -1)
  56. 	{
  57. 		switch(c)
  58. 		{
  59. 		case 'a':
  60. 			opt_a = true;
  61. 			break;
  62. 		case 'P':
  63. 			if(forced_bsize == 0) forced_bsize = 512;
  65. 			opt_P = true;
  66. 			break;
  67. 		case 'k':
  68. 			forced_bsize = 1024;
  69. 			break;
  70. 		case 'h':
  71. 			opt_h = true;
  72. 			fs_col_width = 30;
  73. 			break;
  74. 		case 'i':
  75. 			opt_i = true;
  76. 			break;
  77. 		case 'l':
  78. 			opt_l = true;
  79. 			break;
  80. 		case 'T':
  81. 			opt_T = true;
  82. 			break;
  83. 		case 't':
  84. 			only[only_count++] = optarg;
  85. 			break;
  86. 		case 'x':
  87. 			excluded[excluded_count++] = optarg;
  88. 			break;
  89. 		case ':':
  90. 			fprintf(stderr, "%s: error: Missing operand for option: '-%c'\n", argv0, optopt);
  91. 			return 1;
  92. 		case '?':
  93. 			fprintf(stderr, "%s: error: Unrecognised option: '-%c'\n", argv0, optopt);
  94. 			return 1;
  95. 		}
  96. 	}
  98. 	if(opt_P && opt_T)
  99. 	{
  100. 		fprintf(stderr, "%s: error: Options -P and -T are incompatible\n", argv0);
  101. 		return 1;
  102. 	}
  104. 	if(opt_P) opt_h = false;
  106. 	argc -= optind;
  107. 	argv += optind;
  109. 	int args_left = argc != 0 ? argc : 1;
  111. 	bool tty_out = isatty(1);
  112. 	int col_width = tty_out ? 10 : 0;
  114. 	if(!tty_out)
  115. 	{
  116. 		errno = 0;
  117. 		fs_col_width = 0;
  118. 	}
  120. 	dev_t *arg_devs = NULL;
  122. 	if(argc > 0)
  123. 	{
  124. 		arg_devs = calloc(argc, sizeof(dev_t));
  125. 		if(arg_devs == NULL)
  126. 		{
  127. 			fprintf(stderr, "%s: error: Failed to allocate arg_devs array: %s\n", argv0, strerror(errno));
  128. 			return 1;
  129. 		}
  130. 	}
  132. 	assert(errno == 0);
  134. 	for(int i = 0; i < argc; i++)
  135. 	{
  136. 		struct stat file_stats;
  137. 		if(stat(argv[i], &file_stats) != 0)
  138. 		{
  139. 			fprintf(stderr,
  140. 			        "%s: error: Failed getting status for file '%s': %s\n",
  141. 			        argv0,
  142. 			        argv[i],
  143. 			        strerror(errno));
  144. 			goto error;
  145. 		}
  147. 		arg_devs[i] = file_stats.st_dev;
  148. 	}
  150. 	// Begin: Print header
  152. 	printf("%-*s ", fs_col_width, "Filesystem");
  154. 	if(opt_T) printf("%*s ", col_width, "Type");
  156. 	if(opt_i)
  157. 	{
  158. 		printf("%*s %*s %*s ", col_width, "Inodes", col_width, "Iused", col_width, "IFree");
  160. 		if(opt_P)
  161. 			printf("IUse%% Mounted on\n");
  162. 		else
  163. 			printf("IUse%% Mountpoint\n");
  164. 	}
  165. 	else
  166. 	{
  167. 		if(forced_bsize != 0)
  168. 			printf("%zd-blocks ", forced_bsize);
  169. 		else
  170. 			printf("%*s ", col_width, "Total");
  172. 		printf("%*s %*s ", col_width, "Used", col_width, "Available");
  174. 		if(opt_P)
  175. 			printf("Capacity Mounted on\n");
  176. 		else
  177. 			printf("Use%% Mountpoint\n");
  178. 	}
  179. 	// End: Print header
  181. 	assert(errno == 0);
  182. 	FILE *mounted = setmntent(MOUNTED, "r");
  183. 	if(mounted == NULL)
  184. 	{
  185. 		fprintf(stderr,
  186. 		        "%s: error: Failed opening setmntent(\"" MOUNTED "\", \"r\"): %s\n",
  187. 		        argv0,
  188. 		        strerror(errno));
  189. 		goto error;
  190. 	}
  192. 	// FIXME: Fix maximum number of mount entries / devices
  193. 	dev_t devices[4096];
  194. 	size_t devices_found = 0;
  196. 	// Even with argc>0 we still need to go over mntent for the filesystem mountpoint and type
  197. 	while(args_left > 0)
  198. 	{
  199. 		struct mntent *mntent = getmntent(mounted);
  200. 		if(mntent == NULL) break;
  202. 		if(excluded_count > 0)
  203. 		{
  204. 			bool exclude = false;
  206. 			for(size_t i = 0; i < excluded_count; i++)
  207. 				if(strcmp(excluded[i], mntent->mnt_type) == 0)
  208. 				{
  209. 					exclude = true;
  210. 					break;
  211. 				}
  213. 			if(exclude) continue;
  214. 		}
  216. 		if(only_count > 0)
  217. 		{
  218. 			bool include = false;
  220. 			for(size_t i = 0; i < only_count; i++)
  221. 				if(strcmp(only[i], mntent->mnt_type) == 0)
  222. 				{
  223. 					include = true;
  224. 					break;
  225. 				}
  227. 			if(!include) continue;
  228. 		}
  230. 		if(opt_l)
  231. 		{
  232. 			bool remote = false;
  234. 			for(size_t i = 0; i < sizeof(net_fs_list) / sizeof(char *); i++)
  235. 				if(strcmp(net_fs_list[i], mntent->mnt_type) == 0)
  236. 				{
  237. 					remote = true;
  238. 					break;
  239. 				}
  241. 			if(remote) continue;
  242. 		}
  244. 		assert(errno == 0);
  245. 		struct stat file_stats;
  246. 		if(!opt_a || argc > 0)
  247. 		{
  248. 			if(stat(mntent->mnt_dir, &file_stats) != 0)
  249. 			{
  250. 				fprintf(stderr,
  251. 				        "%s: warning: Failed getting status for file '%s': %s\n",
  252. 				        argv0,
  253. 				        mntent->mnt_dir,
  254. 				        strerror(errno));
  255. 				errno = 0;
  256. 			}
  257. 		}
  259. 		if(argc > 0)
  260. 		{
  261. 			bool found = false;
  262. 			for(int i = 0; i < argc; i++)
  263. 				if(arg_devs[i] == file_stats.st_dev)
  264. 				{
  265. 					found = true;
  266. 					break;
  267. 				}
  269. 			if(!found) continue;
  271. 			args_left--;
  272. 		}
  274. 		if(!opt_a)
  275. 		{
  276. 			bool dupe = false;
  277. 			for(size_t i = 0; i < devices_found; i++)
  278. 				if(devices[i] == file_stats.st_dev)
  279. 				{
  280. 					dupe = true;
  281. 					break;
  282. 				}
  284. 			if(dupe) continue;
  286. 			if(devices_found >= 4096)
  287. 				fprintf(stderr,
  288. 				        "%s: warning: Reached maximum amount of devices which can be deduplicated\n",
  289. 				        argv0);
  291. 			devices[devices_found++] = file_stats.st_dev;
  292. 		}
  294. 		// Note: musl prior to 1.2.5 has broken getmntent when octal sequences and carriage return is used
  295. 		// https://git.musl-libc.org/cgit/musl/commit/src/misc/mntent.c?id=f314e133929b6379eccc632bef32eaebb66a7335
  296. 		// https://git.musl-libc.org/cgit/musl/commit/src/misc/mntent.c?id=ee1d39bc1573c1ae49ee6b658938b56bbef95a6c
  297. 		assert(errno == 0);
  298. 		struct statvfs stats;
  299. 		if(statvfs(mntent->mnt_dir, &stats) != 0)
  300. 		{
  301. 			fprintf(stderr,
  302. 			        "%s: warning: Failed getting statistics for filesystem '%s': %s\n",
  303. 			        argv0,
  304. 			        mntent->mnt_dir,
  305. 			        strerror(errno));
  306. 			errno = 0;
  308. 			static_escape(mntent->mnt_fsname);
  309. 			static_escape(mntent->mnt_dir);
  311. 			if(opt_a)
  312. 			{
  313. 				printf("%-*s ", fs_col_width, mntent->mnt_fsname);
  315. 				if(opt_T) printf("%*s ", col_width, mntent->mnt_type);
  317. 				printf("%*s ", col_width, "-");       // total
  318. 				printf("%*s ", col_width, "-");       // used
  319. 				printf("%*s ", col_width, "-");       // free
  320. 				printf("%*s ", tty_out ? 3 : 0, "-"); // percent
  321. 				printf("%s\n", mntent->mnt_dir);
  322. 			}
  324. 			continue;
  325. 		}
  327. 		// Skip null filesystems
  328. 		if(!opt_a && stats.f_blocks == 0) continue;
  330. 		// Needs to be done after calling statvfs(3) and stat(3)
  331. 		static_escape(mntent->mnt_fsname);
  332. 		static_escape(mntent->mnt_dir);
  334. 		printf("%-*s ", fs_col_width, mntent->mnt_fsname);
  336. 		if(opt_T) printf("%*s ", col_width, mntent->mnt_type);
  338. 		if(opt_i)
  339. 		{
  340. 			fsfilcnt_t used = stats.f_files - stats.f_ffree;
  341. 			fsfilcnt_t percent = (used / stats.f_files) * 100;
  343. 			if(opt_h && !opt_P)
  344. 			{
  345. 				struct si_scale total_scl = dtosi(stats.f_files, false);
  346. 				struct si_scale used_scl = dtosi(used, false);
  347. 				struct si_scale free_scl = dtosi(stats.f_ffree, false);
  349. 				int width_num = tty_out ? col_width - 1 : 0;
  350. 				int width_pre = tty_out ? 1 : 0;
  352. 				printf("%*.2f%-*s ", width_num, total_scl.number, width_pre, total_scl.prefix);
  353. 				printf("%*.2f%-*s ", width_num, used_scl.number, width_pre, used_scl.prefix);
  354. 				printf("%*.2f%-*s ", width_num, free_scl.number, width_pre, free_scl.prefix);
  355. 			}
  356. 			else
  357. 			{
  358. 				printf("%*zd ", col_width, stats.f_files);
  359. 				printf("%*zd ", col_width, used);
  360. 				printf("%*zd ", col_width, stats.f_ffree);
  361. 			}
  363. 			printf("%*zd%% ", tty_out ? 4 : 0, percent);
  364. 			printf("%s\n", mntent->mnt_dir);
  366. 			continue;
  367. 		}
  369. 		off_t percent = 0;
  370. 		off_t total = stats.f_frsize * (stats.f_blocks != 0 ? stats.f_blocks : 1);
  371. 		off_t free = stats.f_bfree * (stats.f_bsize != 0 ? stats.f_bsize : 1);
  372. 		off_t used = total - free;
  374. 		if(used + free)
  375. 		{
  376. 			percent = (used * 100) / (used + free);
  377. 			if(used * 100 != percent * (used + free)) percent++;
  378. 		}
  380. 		if(forced_bsize != 0)
  381. 		{
  382. 			total /= forced_bsize;
  383. 			free /= forced_bsize;
  384. 			used /= forced_bsize;
  385. 		}
  387. 		if(opt_h && !opt_P)
  388. 		{
  389. 			struct si_scale total_scl = dtosi(total, true);
  390. 			struct si_scale used_scl = dtosi(used, true);
  391. 			struct si_scale free_scl = dtosi(free, true);
  393. 			int width_num = tty_out ? col_width - 3 : 0;
  394. 			int width_pre = tty_out ? 3 : 0;
  396. 			printf("%*.2f%-*s ", width_num, total_scl.number, width_pre, total_scl.prefix);
  397. 			printf("%*.2f%-*s ", width_num, used_scl.number, width_pre, used_scl.prefix);
  398. 			printf("%*.2f%-*s ", width_num, free_scl.number, width_pre, free_scl.prefix);
  399. 		}
  400. 		else
  401. 		{
  402. 			printf("%*zd ", col_width, total);
  403. 			printf("%*zd ", col_width, used);
  404. 			printf("%*zd ", col_width, free);
  405. 		}
  407. 		printf("%*zd%% ", tty_out ? 3 : 0, percent);
  408. 		printf("%s\n", mntent->mnt_dir);
  409. 	}
  411. 	endmntent(mounted);
  413. 	if(argc > 0) free(arg_devs);
  415. 	return 0;
  417. error:
  418. 	if(argc > 0) free(arg_devs);
  420. 	return 1;
  421. }