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utils-std

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

df.c (9351B)

    

  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 <ctype.h> // iscntrl, isspace
  11. #include <errno.h> // errno
  12. #include <mntent.h>
  13. #include <stdbool.h>
  14. #include <stdio.h>    // printf
  15. #include <stdlib.h>   // abort, exit
  16. #include <string.h>   // strerror
  17. #include <sys/stat.h> // stat, dev_t
  18. #include <sys/statvfs.h>
  19. #include <unistd.h> // getopt
  21. // Grabbed from OpenRC rc-functions.sh
  22. // clang-format off
  23. static const char *net_fs_list[] = {
  24. 	"afs", "ceph", "cifs", "coda", "davfs", "fuse", "fuse.glusterfs",
  25. 	"fuse.sshfs", "gfs", "glusterfs", "lustre", "ncpfs", "nfs", "nfs4",
  26. 	"ocfs2", "shfs", "smbfs"
  27. };
  28. // clang-format on
  30. blksize_t forced_bsize = 0;
  31. const char *argv0 = "df";
  33. // Replaces control characters and whitespaces with '?' in-place (no allocation)
  34. static void
  35. static_escape(char *str)
  36. {
  37. 	for(size_t i = 0; i < strlen(str); i++)
  38. 		if(iscntrl(str[i]) || isspace(str[i])) str[i] = '?';
  39. }
  41. int
  42. main(int argc, char *argv[])
  43. {
  44. 	bool opt_P = false, opt_h = false, opt_a = false, opt_T = false, opt_l = false, opt_i = false;
  45. 	int fs_col_width = 20;
  47. 	size_t excluded_count = 0;
  48. 	char *excluded[4096];
  50. 	size_t only_count = 0;
  51. 	char *only[4096];
  53. 	int c = -1;
  54. 	while((c = getopt(argc, argv, ":ahilPkTt:x:")) != -1)
  55. 	{
  56. 		switch(c)
  57. 		{
  58. 		case 'a':
  59. 			opt_a = true;
  60. 			break;
  61. 		case 'P':
  62. 			if(forced_bsize == 0) forced_bsize = 512;
  64. 			opt_P = true;
  65. 			break;
  66. 		case 'k':
  67. 			forced_bsize = 1024;
  68. 			break;
  69. 		case 'h':
  70. 			opt_h = true;
  71. 			fs_col_width = 30;
  72. 			break;
  73. 		case 'i':
  74. 			opt_i = true;
  75. 			break;
  76. 		case 'l':
  77. 			opt_l = true;
  78. 			break;
  79. 		case 'T':
  80. 			opt_T = true;
  81. 			break;
  82. 		case 't':
  83. 			only[only_count++] = optarg;
  84. 			break;
  85. 		case 'x':
  86. 			excluded[excluded_count++] = optarg;
  87. 			break;
  88. 		case ':':
  89. 			fprintf(stderr, "%s: error: Missing operand for option: '-%c'\n", argv0, optopt);
  90. 			return 1;
  91. 		case '?':
  92. 			fprintf(stderr, "%s: error: Unrecognised option: '-%c'\n", argv0, optopt);
  93. 			return 1;
  94. 		}
  95. 	}
  97. 	if(opt_P && opt_T)
  98. 	{
  99. 		fprintf(stderr, "%s: error: Options -P and -T are incompatible\n", argv0);
  100. 		return 1;
  101. 	}
  103. 	if(opt_P) opt_h = false;
  105. 	argc -= optind;
  106. 	argv += optind;
  108. 	int args_left = argc != 0 ? argc : 1;
  110. 	bool tty_out = isatty(1);
  111. 	int col_width = tty_out ? 10 : 0;
  113. 	if(!tty_out)
  114. 	{
  115. 		errno = 0;
  116. 		fs_col_width = 0;
  117. 	}
  119. 	dev_t *arg_devs = NULL;
  121. 	if(argc > 0)
  122. 	{
  123. 		arg_devs = calloc(argc, sizeof(dev_t));
  124. 		if(arg_devs == NULL)
  125. 		{
  126. 			fprintf(stderr, "%s: error: Failed to allocate arg_devs array: %s\n", argv0, strerror(errno));
  127. 			return 1;
  128. 		}
  129. 	}
  131. 	for(int i = 0; i < argc; i++)
  132. 	{
  133. 		struct stat file_stats;
  134. 		if(stat(argv[i], &file_stats) != 0)
  135. 		{
  136. 			fprintf(stderr,
  137. 			        "%s: error: Failed getting status for file '%s': %s\n",
  138. 			        argv0,
  139. 			        argv[i],
  140. 			        strerror(errno));
  141. 			goto error;
  142. 		}
  144. 		arg_devs[i] = file_stats.st_dev;
  145. 	}
  147. 	// Begin: Print header
  149. 	printf("%-*s ", fs_col_width, "Filesystem");
  151. 	if(opt_T) printf("%*s ", col_width, "Type");
  153. 	if(opt_i)
  154. 	{
  155. 		printf("%*s %*s %*s ", col_width, "Inodes", col_width, "Iused", col_width, "IFree");
  157. 		if(opt_P)
  158. 			printf("IUse%% Mounted on\n");
  159. 		else
  160. 			printf("IUse%% Mountpoint\n");
  161. 	}
  162. 	else
  163. 	{
  164. 		if(forced_bsize != 0)
  165. 			printf("%zd-blocks ", forced_bsize);
  166. 		else
  167. 			printf("%*s ", col_width, "Total");
  169. 		printf("%*s %*s ", col_width, "Used", col_width, "Available");
  171. 		if(opt_P)
  172. 			printf("Capacity Mounted on\n");
  173. 		else
  174. 			printf("Use%% Mountpoint\n");
  175. 	}
  176. 	// End: Print header
  178. 	FILE *mounted = setmntent(MOUNTED, "r");
  179. 	if(mounted == NULL)
  180. 	{
  181. 		fprintf(stderr,
  182. 		        "%s: error: Failed opening setmntent(\"" MOUNTED "\", \"r\"): %s\n",
  183. 		        argv0,
  184. 		        strerror(errno));
  185. 		goto error;
  186. 	}
  188. 	// FIXME: Fix maximum number of mount entries / devices
  189. 	dev_t devices[4096];
  190. 	size_t devices_found = 0;
  192. 	// Even with argc>0 we still need to go over mntent for the filesystem mountpoint and type
  193. 	while(args_left > 0)
  194. 	{
  195. 		struct mntent *mntent = getmntent(mounted);
  196. 		if(mntent == NULL) break;
  198. 		if(excluded_count > 0)
  199. 		{
  200. 			bool exclude = false;
  202. 			for(size_t i = 0; i < excluded_count; i++)
  203. 				if(strcmp(excluded[i], mntent->mnt_type) == 0)
  204. 				{
  205. 					exclude = true;
  206. 					break;
  207. 				}
  209. 			if(exclude) continue;
  210. 		}
  212. 		if(only_count > 0)
  213. 		{
  214. 			bool include = false;
  216. 			for(size_t i = 0; i < only_count; i++)
  217. 				if(strcmp(only[i], mntent->mnt_type) == 0)
  218. 				{
  219. 					include = true;
  220. 					break;
  221. 				}
  223. 			if(!include) continue;
  224. 		}
  226. 		if(opt_l)
  227. 		{
  228. 			bool remote = false;
  230. 			for(size_t i = 0; i < sizeof(net_fs_list) / sizeof(char *); i++)
  231. 				if(strcmp(net_fs_list[i], mntent->mnt_type) == 0)
  232. 				{
  233. 					remote = true;
  234. 					break;
  235. 				}
  237. 			if(remote) continue;
  238. 		}
  240. 		struct stat file_stats;
  241. 		if(!opt_a || argc > 0)
  242. 		{
  243. 			if(stat(mntent->mnt_dir, &file_stats) != 0)
  244. 			{
  245. 				fprintf(stderr,
  246. 				        "%s: warning: Failed getting status for file '%s': %s\n",
  247. 				        argv0,
  248. 				        mntent->mnt_dir,
  249. 				        strerror(errno));
  250. 				errno = 0;
  251. 			}
  252. 		}
  254. 		if(argc > 0)
  255. 		{
  256. 			bool found = false;
  257. 			for(int i = 0; i < argc; i++)
  258. 				if(arg_devs[i] == file_stats.st_dev)
  259. 				{
  260. 					found = true;
  261. 					break;
  262. 				}
  264. 			if(!found) continue;
  266. 			args_left--;
  267. 		}
  269. 		if(!opt_a)
  270. 		{
  271. 			bool dupe = false;
  272. 			for(size_t i = 0; i < devices_found; i++)
  273. 				if(devices[i] == file_stats.st_dev)
  274. 				{
  275. 					dupe = true;
  276. 					break;
  277. 				}
  279. 			if(dupe) continue;
  281. 			if(devices_found >= 4096)
  282. 				fprintf(stderr,
  283. 				        "%s: warning: Reached maximum amount of devices which can be deduplicated\n",
  284. 				        argv0);
  286. 			devices[devices_found++] = file_stats.st_dev;
  287. 		}
  289. 		// Note: musl prior to 1.2.5 has broken getmntent when octal sequences and carriage return is used
  290. 		// https://git.musl-libc.org/cgit/musl/commit/src/misc/mntent.c?id=f314e133929b6379eccc632bef32eaebb66a7335
  291. 		// https://git.musl-libc.org/cgit/musl/commit/src/misc/mntent.c?id=ee1d39bc1573c1ae49ee6b658938b56bbef95a6c
  292. 		struct statvfs stats;
  293. 		if(statvfs(mntent->mnt_dir, &stats) != 0)
  294. 		{
  295. 			fprintf(stderr,
  296. 			        "%s: warning: Failed getting statistics for filesystem '%s': %s\n",
  297. 			        argv0,
  298. 			        mntent->mnt_dir,
  299. 			        strerror(errno));
  300. 			errno = 0;
  302. 			static_escape(mntent->mnt_fsname);
  303. 			static_escape(mntent->mnt_dir);
  305. 			if(opt_a)
  306. 			{
  307. 				printf("%-*s ", fs_col_width, mntent->mnt_fsname);
  309. 				if(opt_T) printf("%*s ", col_width, mntent->mnt_type);
  311. 				printf("%*s ", col_width, "-");       // total
  312. 				printf("%*s ", col_width, "-");       // used
  313. 				printf("%*s ", col_width, "-");       // free
  314. 				printf("%*s ", tty_out ? 3 : 0, "-"); // percent
  315. 				printf("%s\n", mntent->mnt_dir);
  316. 			}
  318. 			continue;
  319. 		}
  321. 		// Skip null filesystems
  322. 		if(!opt_a && stats.f_blocks == 0) continue;
  324. 		// Needs to be done after calling statvfs(3) and stat(3)
  325. 		static_escape(mntent->mnt_fsname);
  326. 		static_escape(mntent->mnt_dir);
  328. 		printf("%-*s ", fs_col_width, mntent->mnt_fsname);
  330. 		if(opt_T) printf("%*s ", col_width, mntent->mnt_type);
  332. 		if(opt_i)
  333. 		{
  334. 			fsfilcnt_t used = stats.f_files - stats.f_ffree;
  335. 			fsfilcnt_t percent = (used / stats.f_files) * 100;
  337. 			if(opt_h && !opt_P)
  338. 			{
  339. 				struct si_scale total_scl = dtosi(stats.f_files, false);
  340. 				struct si_scale used_scl = dtosi(used, false);
  341. 				struct si_scale free_scl = dtosi(stats.f_ffree, false);
  343. 				int width_num = tty_out ? col_width - 1 : 0;
  344. 				int width_pre = tty_out ? 1 : 0;
  346. 				printf("%*.2f%-*s ", width_num, total_scl.number, width_pre, total_scl.prefix);
  347. 				printf("%*.2f%-*s ", width_num, used_scl.number, width_pre, used_scl.prefix);
  348. 				printf("%*.2f%-*s ", width_num, free_scl.number, width_pre, free_scl.prefix);
  349. 			}
  350. 			else
  351. 			{
  352. 				printf("%*zd ", col_width, stats.f_files);
  353. 				printf("%*zd ", col_width, used);
  354. 				printf("%*zd ", col_width, stats.f_ffree);
  355. 			}
  357. 			printf("%*zd%% ", tty_out ? 4 : 0, percent);
  358. 			printf("%s\n", mntent->mnt_dir);
  360. 			continue;
  361. 		}
  363. 		off_t percent = 0;
  364. 		off_t total = stats.f_frsize * (stats.f_blocks != 0 ? stats.f_blocks : 1);
  365. 		off_t free = stats.f_bfree * (stats.f_bsize != 0 ? stats.f_bsize : 1);
  366. 		off_t used = total - free;
  368. 		if(used + free)
  369. 		{
  370. 			percent = (used * 100) / (used + free);
  371. 			if(used * 100 != percent * (used + free)) percent++;
  372. 		}
  374. 		if(forced_bsize != 0)
  375. 		{
  376. 			total /= forced_bsize;
  377. 			free /= forced_bsize;
  378. 			used /= forced_bsize;
  379. 		}
  381. 		if(opt_h && !opt_P)
  382. 		{
  383. 			struct si_scale total_scl = dtosi(total, true);
  384. 			struct si_scale used_scl = dtosi(used, true);
  385. 			struct si_scale free_scl = dtosi(free, true);
  387. 			int width_num = tty_out ? col_width - 3 : 0;
  388. 			int width_pre = tty_out ? 3 : 0;
  390. 			printf("%*.2f%-*s ", width_num, total_scl.number, width_pre, total_scl.prefix);
  391. 			printf("%*.2f%-*s ", width_num, used_scl.number, width_pre, used_scl.prefix);
  392. 			printf("%*.2f%-*s ", width_num, free_scl.number, width_pre, free_scl.prefix);
  393. 		}
  394. 		else
  395. 		{
  396. 			printf("%*zd ", col_width, total);
  397. 			printf("%*zd ", col_width, used);
  398. 			printf("%*zd ", col_width, free);
  399. 		}
  401. 		printf("%*zd%% ", tty_out ? 3 : 0, percent);
  402. 		printf("%s\n", mntent->mnt_dir);
  403. 	}
  405. 	endmntent(mounted);
  407. 	if(argc > 0) free(arg_devs);
  409. 	return 0;
  411. error:
  412. 	if(argc > 0) free(arg_devs);
  414. 	return 1;
  415. }