blkid.c revision d1154eb460efe588eaed3d439c1caaca149fa362
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 29extern int getopt(int argc, char * const argv[], const char *optstring); 30extern char *optarg; 31extern 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 41const char *progname = "blkid"; 42 43static void print_version(FILE *out) 44{ 45 fprintf(out, "%s %s (%s)\n", progname, BLKID_VERSION, BLKID_DATE); 46} 47 48static 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 */ 73static 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 fputc(ch, stdout); 91 } 92} 93 94static int get_terminal_width(void) 95{ 96#ifdef TIOCGSIZE 97 struct ttysize t_win; 98#endif 99#ifdef TIOCGWINSZ 100 struct winsize w_win; 101#endif 102 const char *cp; 103 104#ifdef TIOCGSIZE 105 if (ioctl (0, TIOCGSIZE, &t_win) == 0) 106 return (t_win.ts_cols); 107#endif 108#ifdef TIOCGWINSZ 109 if (ioctl (0, TIOCGWINSZ, &w_win) == 0) 110 return (w_win.ws_col); 111#endif 112 cp = getenv("COLUMNS"); 113 if (cp) 114 return strtol(cp, NULL, 10); 115 return 80; 116} 117 118static int pretty_print_word(const char *str, int max_len, 119 int left_len, int overflow_nl) 120{ 121 int len = strlen(str) + left_len; 122 int ret = 0; 123 124 fputs(str, stdout); 125 if (overflow_nl && len > max_len) { 126 fputc('\n', stdout); 127 len = 0; 128 } else if (len > max_len) 129 ret = len - max_len; 130 do 131 fputc(' ', stdout); 132 while (len++ < max_len); 133 return ret; 134} 135 136static void pretty_print_line(const char *device, const char *fs_type, 137 const char *label, const char *mtpt, 138 const char *uuid) 139{ 140 static int device_len = 10, fs_type_len = 7; 141 static int label_len = 8, mtpt_len = 14; 142 static int term_width = -1; 143 int len, w; 144 145 if (term_width < 0) 146 term_width = get_terminal_width(); 147 148 if (term_width > 80) { 149 term_width -= 80; 150 w = term_width / 10; 151 if (w > 8) 152 w = 8; 153 term_width -= 2*w; 154 label_len += w; 155 fs_type_len += w; 156 w = term_width/2; 157 device_len += w; 158 mtpt_len +=w; 159 } 160 161 len = pretty_print_word(device, device_len, 0, 1); 162 len = pretty_print_word(fs_type, fs_type_len, len, 0); 163 len = pretty_print_word(label, label_len, len, 0); 164 len = pretty_print_word(mtpt, mtpt_len, len, 0); 165 fputs(uuid, stdout); 166 fputc('\n', stdout); 167} 168 169static void pretty_print_dev(blkid_dev dev) 170{ 171 blkid_tag_iterate iter; 172 const char *type, *value, *devname; 173 const char *uuid = "", *fs_type = "", *label = ""; 174 int len, mount_flags; 175 char mtpt[80]; 176 errcode_t retval; 177 178 if (dev == NULL) { 179 pretty_print_line("device", "fs_type", "label", 180 "mount point", "UUID"); 181 for (len=get_terminal_width()-1; len > 0; len--) 182 fputc('-', stdout); 183 fputc('\n', stdout); 184 return; 185 } 186 187 devname = blkid_dev_devname(dev); 188 if (access(devname, F_OK)) 189 return; 190 191 /* Get the uuid, label, type */ 192 iter = blkid_tag_iterate_begin(dev); 193 while (blkid_tag_next(iter, &type, &value) == 0) { 194 if (!strcmp(type, "UUID")) 195 uuid = value; 196 if (!strcmp(type, "TYPE")) 197 fs_type = value; 198 if (!strcmp(type, "LABEL")) 199 label = value; 200 } 201 blkid_tag_iterate_end(iter); 202 203 /* Get the mount point */ 204 mtpt[0] = 0; 205 retval = ext2fs_check_mount_point(devname, &mount_flags, 206 mtpt, sizeof(mtpt)); 207 if (retval == 0) { 208 if (mount_flags & EXT2_MF_MOUNTED) { 209 if (!mtpt[0]) 210 strcpy(mtpt, "(mounted, mtpt unknown)"); 211 } else if (mount_flags & EXT2_MF_BUSY) 212 strcpy(mtpt, "(in use)"); 213 else 214 strcpy(mtpt, "(not mounted)"); 215 } 216 217 pretty_print_line(devname, fs_type, label, mtpt, uuid); 218} 219 220static void print_tags(blkid_dev dev, char *show[], int numtag, int output) 221{ 222 blkid_tag_iterate iter; 223 const char *type, *value; 224 int i, first = 1; 225 226 if (!dev) 227 return; 228 229 if (output & OUTPUT_PRETTY_LIST) { 230 pretty_print_dev(dev); 231 return; 232 } 233 234 if (output & OUTPUT_DEVICE_ONLY) { 235 printf("%s\n", blkid_dev_devname(dev)); 236 return; 237 } 238 239 iter = blkid_tag_iterate_begin(dev); 240 while (blkid_tag_next(iter, &type, &value) == 0) { 241 if (numtag && show) { 242 for (i=0; i < numtag; i++) 243 if (!strcmp(type, show[i])) 244 break; 245 if (i >= numtag) 246 continue; 247 } 248 if (output & OUTPUT_VALUE_ONLY) { 249 fputs(value, stdout); 250 fputc('\n', stdout); 251 } else { 252 if (first) { 253 printf("%s: ", blkid_dev_devname(dev)); 254 first = 0; 255 } 256 fputs(type, stdout); 257 fputs("=\"", stdout); 258 safe_print(value, -1); 259 fputs("\" ", stdout); 260 } 261 } 262 blkid_tag_iterate_end(iter); 263 264 if (!first && !(output & OUTPUT_VALUE_ONLY)) 265 printf("\n"); 266} 267 268int main(int argc, char **argv) 269{ 270 blkid_cache cache = NULL; 271 char *devices[128] = { NULL, }; 272 char *show[128] = { NULL, }; 273 char *search_type = NULL, *search_value = NULL; 274 char *read = NULL; 275 char *write = NULL; 276 unsigned int numdev = 0, numtag = 0; 277 int version = 0; 278 int err = 4; 279 unsigned int i; 280 int output_format = 0; 281 int lookup = 0, gc = 0; 282 int c; 283 284 while ((c = getopt (argc, argv, "c:f:ghlLo:s:t:w:v")) != EOF) 285 switch (c) { 286 case 'c': 287 if (optarg && !*optarg) 288 read = NULL; 289 else 290 read = optarg; 291 if (!write) 292 write = read; 293 break; 294 case 'l': 295 lookup++; 296 break; 297 case 'L': 298 output_format = OUTPUT_PRETTY_LIST; 299 break; 300 case 'g': 301 gc = 1; 302 break; 303 case 'o': 304 if (!strcmp(optarg, "value")) 305 output_format = OUTPUT_VALUE_ONLY; 306 else if (!strcmp(optarg, "device")) 307 output_format = OUTPUT_DEVICE_ONLY; 308 else if (!strcmp(optarg, "list")) 309 output_format = OUTPUT_PRETTY_LIST; 310 else if (!strcmp(optarg, "full")) 311 output_format = 0; 312 else { 313 fprintf(stderr, "Invalid output format %s. " 314 "Choose from value,\n\t" 315 "device, list, or full\n", optarg); 316 exit(1); 317 } 318 break; 319 case 's': 320 if (numtag >= sizeof(show) / sizeof(*show)) { 321 fprintf(stderr, "Too many tags specified\n"); 322 usage(err); 323 } 324 show[numtag++] = optarg; 325 break; 326 case 't': 327 if (search_type) { 328 fprintf(stderr, "Can only search for " 329 "one NAME=value pair\n"); 330 usage(err); 331 } 332 if (blkid_parse_tag_string(optarg, 333 &search_type, 334 &search_value)) { 335 fprintf(stderr, "-t needs NAME=value pair\n"); 336 usage(err); 337 } 338 break; 339 case 'v': 340 version = 1; 341 break; 342 case 'w': 343 if (optarg && !*optarg) 344 write = NULL; 345 else 346 write = optarg; 347 break; 348 case 'h': 349 err = 0; 350 default: 351 usage(err); 352 } 353 354 while (optind < argc) 355 devices[numdev++] = argv[optind++]; 356 357 if (version) { 358 print_version(stdout); 359 goto exit; 360 } 361 362 if (blkid_get_cache(&cache, read) < 0) 363 goto exit; 364 365 err = 2; 366 if (gc) { 367 blkid_gc_cache(cache); 368 goto exit; 369 } 370 if (output_format & OUTPUT_PRETTY_LIST) 371 pretty_print_dev(NULL); 372 373 if (lookup) { 374 blkid_dev dev; 375 376 if (!search_type) { 377 fprintf(stderr, "The lookup option requires a " 378 "search type specified using -t\n"); 379 exit(1); 380 } 381 /* Load any additional devices not in the cache */ 382 for (i = 0; i < numdev; i++) 383 blkid_get_dev(cache, devices[i], BLKID_DEV_NORMAL); 384 385 if ((dev = blkid_find_dev_with_tag(cache, search_type, 386 search_value))) { 387 print_tags(dev, show, numtag, output_format); 388 err = 0; 389 } 390 /* If we didn't specify a single device, show all available devices */ 391 } else if (!numdev) { 392 blkid_dev_iterate iter; 393 blkid_dev dev; 394 395 blkid_probe_all(cache); 396 397 iter = blkid_dev_iterate_begin(cache); 398 blkid_dev_set_search(iter, search_type, search_value); 399 while (blkid_dev_next(iter, &dev) == 0) { 400 dev = blkid_verify(cache, dev); 401 if (!dev) 402 continue; 403 print_tags(dev, show, numtag, output_format); 404 err = 0; 405 } 406 blkid_dev_iterate_end(iter); 407 /* Add all specified devices to cache (optionally display tags) */ 408 } else for (i = 0; i < numdev; i++) { 409 blkid_dev dev = blkid_get_dev(cache, devices[i], 410 BLKID_DEV_NORMAL); 411 412 if (dev) { 413 if (search_type && 414 !blkid_dev_has_tag(dev, search_type, 415 search_value)) 416 continue; 417 print_tags(dev, show, numtag, output_format); 418 err = 0; 419 } 420 } 421 422exit: 423 free(search_type); 424 free(search_value); 425 blkid_put_cache(cache); 426 return err; 427} 428