1 /* 2 * blkid.c - User command-line interface for libblkid 3 * 4 * Copyright (C) 2001 Andreas Dilger 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the 8 * GNU Lesser General Public License. 9 * %End-Header% 10 */ 11 12 #include "config.h" 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <unistd.h> 16 #include <string.h> 17 #ifdef HAVE_TERMIOS_H 18 #include <termios.h> 19 #endif 20 #ifdef HAVE_TERMIO_H 21 #include <termio.h> 22 #endif 23 #ifdef HAVE_SYS_IOCTL_H 24 #include <sys/ioctl.h> 25 #endif 26 #ifdef HAVE_GETOPT_H 27 #include <getopt.h> 28 #else 29 extern int getopt(int argc, char * const argv[], const char *optstring); 30 extern char *optarg; 31 extern int optind; 32 #endif 33 34 #define OUTPUT_VALUE_ONLY 0x0001 35 #define OUTPUT_DEVICE_ONLY 0x0002 36 #define OUTPUT_PRETTY_LIST 0x0004 37 38 #include "ext2fs/ext2fs.h" 39 #include "blkid/blkid.h" 40 41 static const char *progname = "blkid"; 42 43 static void print_version(FILE *out) 44 { 45 fprintf(out, "%s %s (%s)\n", progname, BLKID_VERSION, BLKID_DATE); 46 } 47 48 static void usage(int error) 49 { 50 FILE *out = error ? stderr : stdout; 51 52 print_version(out); 53 fprintf(out, 54 "usage:\t%s [-c <file>] [-ghlLv] [-o format] " 55 "[-s <tag>] [-t <token>]\n [-w <file>] [dev ...]\n" 56 "\t-c\tcache file (default: /etc/blkid.tab, /dev/null = none)\n" 57 "\t-h\tprint this usage message and exit\n" 58 "\t-g\tgarbage collect the blkid cache\n" 59 "\t-s\tshow specified tag(s) (default show all tags)\n" 60 "\t-t\tfind device with a specific token (NAME=value pair)\n" 61 "\t-l\tlookup the the first device with arguments specified by -t\n" 62 "\t-v\tprint version and exit\n" 63 "\t-w\twrite cache to different file (/dev/null = no write)\n" 64 "\tdev\tspecify device(s) to probe (default: all devices)\n", 65 progname); 66 exit(error); 67 } 68 69 /* 70 * This function does "safe" printing. It will convert non-printable 71 * ASCII characters using '^' and M- notation. 72 */ 73 static void safe_print(const char *cp, int len) 74 { 75 unsigned char ch; 76 77 if (len < 0) 78 len = strlen(cp); 79 80 while (len--) { 81 ch = *cp++; 82 if (ch > 128) { 83 fputs("M-", stdout); 84 ch -= 128; 85 } 86 if ((ch < 32) || (ch == 0x7f)) { 87 fputc('^', stdout); 88 ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */ 89 } 90 if (ch != '"') { 91 fputc(ch, stdout); 92 } 93 } 94 } 95 96 static int get_terminal_width(void) 97 { 98 #ifdef TIOCGSIZE 99 struct ttysize t_win; 100 #endif 101 #ifdef TIOCGWINSZ 102 struct winsize w_win; 103 #endif 104 const char *cp; 105 int width = 80; 106 107 #ifdef TIOCGSIZE 108 if (ioctl (0, TIOCGSIZE, &t_win) == 0) { 109 width = t_win.ts_cols; 110 goto got_it; 111 } 112 #endif 113 #ifdef TIOCGWINSZ 114 if (ioctl (0, TIOCGWINSZ, &w_win) == 0) { 115 width = w_win.ws_col; 116 goto got_it; 117 } 118 #endif 119 cp = getenv("COLUMNS"); 120 if (cp) 121 width = atoi(cp); 122 got_it: 123 if (width > 4096) 124 return 4096; /* sanity check */ 125 return width; 126 } 127 128 static int pretty_print_word(const char *str, int max_len, 129 int left_len, int overflow_nl) 130 { 131 int len = strlen(str) + left_len; 132 int ret = 0; 133 134 fputs(str, stdout); 135 if (overflow_nl && len > max_len) { 136 fputc('\n', stdout); 137 len = 0; 138 } else if (len > max_len) 139 ret = len - max_len; 140 do { 141 fputc(' ', stdout); 142 } while (len++ < max_len); 143 return ret; 144 } 145 146 static void pretty_print_line(const char *device, const char *fs_type, 147 const char *label, const char *mtpt, 148 const char *uuid) 149 { 150 static int device_len = 10, fs_type_len = 7; 151 static int label_len = 8, mtpt_len = 14; 152 static int term_width = -1; 153 int len, w; 154 155 if (term_width < 0) { 156 term_width = get_terminal_width(); 157 158 if (term_width > 80) { 159 term_width -= 80; 160 w = term_width / 10; 161 if (w > 8) 162 w = 8; 163 term_width -= 2*w; 164 label_len += w; 165 fs_type_len += w; 166 w = term_width/2; 167 device_len += w; 168 mtpt_len +=w; 169 } 170 } 171 172 len = pretty_print_word(device, device_len, 0, 1); 173 len = pretty_print_word(fs_type, fs_type_len, len, 0); 174 len = pretty_print_word(label, label_len, len, 0); 175 len = pretty_print_word(mtpt, mtpt_len, len, 0); 176 fputs(uuid, stdout); 177 fputc('\n', stdout); 178 } 179 180 static void pretty_print_dev(blkid_dev dev) 181 { 182 blkid_tag_iterate iter; 183 const char *type, *value, *devname; 184 const char *uuid = "", *fs_type = "", *label = ""; 185 int len, mount_flags; 186 char mtpt[80]; 187 errcode_t retval; 188 189 if (dev == NULL) { 190 pretty_print_line("device", "fs_type", "label", 191 "mount point", "UUID"); 192 for (len=get_terminal_width()-1; len > 0; len--) 193 fputc('-', stdout); 194 fputc('\n', stdout); 195 return; 196 } 197 198 devname = blkid_dev_devname(dev); 199 if (access(devname, F_OK)) 200 return; 201 202 /* Get the uuid, label, type */ 203 iter = blkid_tag_iterate_begin(dev); 204 while (blkid_tag_next(iter, &type, &value) == 0) { 205 if (!strcmp(type, "UUID")) 206 uuid = value; 207 if (!strcmp(type, "TYPE")) 208 fs_type = value; 209 if (!strcmp(type, "LABEL")) 210 label = value; 211 } 212 blkid_tag_iterate_end(iter); 213 214 /* Get the mount point */ 215 mtpt[0] = 0; 216 retval = ext2fs_check_mount_point(devname, &mount_flags, 217 mtpt, sizeof(mtpt)); 218 if (retval == 0) { 219 if (mount_flags & EXT2_MF_MOUNTED) { 220 if (!mtpt[0]) 221 strcpy(mtpt, "(mounted, mtpt unknown)"); 222 } else if (mount_flags & EXT2_MF_BUSY) 223 strcpy(mtpt, "(in use)"); 224 else 225 strcpy(mtpt, "(not mounted)"); 226 } 227 228 pretty_print_line(devname, fs_type, label, mtpt, uuid); 229 } 230 231 static void print_tags(blkid_dev dev, char *show[], int numtag, int output) 232 { 233 blkid_tag_iterate iter; 234 const char *type, *value; 235 int i, first = 1; 236 237 if (!dev) 238 return; 239 240 if (output & OUTPUT_PRETTY_LIST) { 241 pretty_print_dev(dev); 242 return; 243 } 244 245 if (output & OUTPUT_DEVICE_ONLY) { 246 printf("%s\n", blkid_dev_devname(dev)); 247 return; 248 } 249 250 iter = blkid_tag_iterate_begin(dev); 251 while (blkid_tag_next(iter, &type, &value) == 0) { 252 if (numtag && show) { 253 for (i=0; i < numtag; i++) 254 if (!strcmp(type, show[i])) 255 break; 256 if (i >= numtag) 257 continue; 258 } 259 if (output & OUTPUT_VALUE_ONLY) { 260 fputs(value, stdout); 261 fputc('\n', stdout); 262 } else { 263 if (first) { 264 printf("%s: ", blkid_dev_devname(dev)); 265 first = 0; 266 } 267 fputs(type, stdout); 268 fputs("=\"", stdout); 269 safe_print(value, -1); 270 fputs("\" ", stdout); 271 } 272 } 273 blkid_tag_iterate_end(iter); 274 275 if (!first && !(output & OUTPUT_VALUE_ONLY)) 276 printf("\n"); 277 } 278 279 int main(int argc, char **argv) 280 { 281 blkid_cache cache = NULL; 282 char *devices[128] = { NULL, }; 283 char *show[128] = { NULL, }; 284 char *search_type = NULL, *search_value = NULL; 285 char *read = NULL; 286 char *write = NULL; 287 unsigned int numdev = 0, numtag = 0; 288 int version = 0; 289 int err = 4; 290 unsigned int i; 291 int output_format = 0; 292 int lookup = 0, gc = 0; 293 int c; 294 295 while ((c = getopt (argc, argv, "c:f:ghlLo:s:t:w:v")) != EOF) 296 switch (c) { 297 case 'c': 298 read = optarg; 299 if (!write) 300 write = read; 301 break; 302 case 'l': 303 lookup++; 304 break; 305 case 'L': 306 output_format = OUTPUT_PRETTY_LIST; 307 break; 308 case 'g': 309 gc = 1; 310 break; 311 case 'o': 312 if (!strcmp(optarg, "value")) 313 output_format = OUTPUT_VALUE_ONLY; 314 else if (!strcmp(optarg, "device")) 315 output_format = OUTPUT_DEVICE_ONLY; 316 else if (!strcmp(optarg, "list")) 317 output_format = OUTPUT_PRETTY_LIST; 318 else if (!strcmp(optarg, "full")) 319 output_format = 0; 320 else { 321 fprintf(stderr, "Invalid output format %s. " 322 "Choose from value,\n\t" 323 "device, list, or full\n", optarg); 324 exit(1); 325 } 326 break; 327 case 's': 328 if (numtag >= sizeof(show) / sizeof(*show)) { 329 fprintf(stderr, "Too many tags specified\n"); 330 usage(err); 331 } 332 show[numtag++] = optarg; 333 break; 334 case 't': 335 if (search_type) { 336 fprintf(stderr, "Can only search for " 337 "one NAME=value pair\n"); 338 usage(err); 339 } 340 if (blkid_parse_tag_string(optarg, 341 &search_type, 342 &search_value)) { 343 fprintf(stderr, "-t needs NAME=value pair\n"); 344 usage(err); 345 } 346 break; 347 case 'v': 348 version = 1; 349 break; 350 case 'w': 351 write = optarg; 352 break; 353 case 'h': 354 err = 0; 355 /* fallthrough */ 356 default: 357 usage(err); 358 } 359 360 while (optind < argc) 361 devices[numdev++] = argv[optind++]; 362 363 if (version) { 364 print_version(stdout); 365 goto exit; 366 } 367 368 if (blkid_get_cache(&cache, read) < 0) 369 goto exit; 370 371 err = 2; 372 if (gc) { 373 blkid_gc_cache(cache); 374 goto exit; 375 } 376 if (output_format & OUTPUT_PRETTY_LIST) 377 pretty_print_dev(NULL); 378 379 if (lookup) { 380 blkid_dev dev; 381 382 if (!search_type) { 383 fprintf(stderr, "The lookup option requires a " 384 "search type specified using -t\n"); 385 exit(1); 386 } 387 /* Load any additional devices not in the cache */ 388 for (i = 0; i < numdev; i++) 389 blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL); 390 391 if ((dev = blkid_find_dev_with_tag(cache, search_type, 392 search_value))) { 393 print_tags(dev, show, numtag, output_format); 394 err = 0; 395 } 396 /* If we didn't specify a single device, show all available devices */ 397 } else if (!numdev) { 398 blkid_dev_iterate iter; 399 blkid_dev dev; 400 401 blkid_probe_all(cache); 402 403 iter = blkid_dev_iterate_begin(cache); 404 blkid_dev_set_search(iter, search_type, search_value); 405 while (blkid_dev_next(iter, &dev) == 0) { 406 dev = blkid_verify(cache, dev); 407 if (!dev) 408 continue; 409 print_tags(dev, show, numtag, output_format); 410 err = 0; 411 } 412 blkid_dev_iterate_end(iter); 413 /* Add all specified devices to cache (optionally display tags) */ 414 } else for (i = 0; i < numdev; i++) { 415 blkid_dev dev = blkid_get_dev(cache, devices[i], 416 BLKID_DEV_NORMAL); 417 418 if (dev) { 419 if (search_type && 420 !blkid_dev_has_tag(dev, search_type, 421 search_value)) 422 continue; 423 print_tags(dev, show, numtag, output_format); 424 err = 0; 425 } 426 } 427 428 exit: 429 free(search_type); 430 free(search_value); 431 blkid_put_cache(cache); 432 return err; 433 } 434
