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