extras/volume_id/vol_id.c

   1 /*
   2  * vol_id - udev callout to read filesystem label and uuid
   3  *
   4  * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation version 2 of the License.
   9  *
  10  *      This program is distributed in the hope that it will be useful, but
  11  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *      General Public License for more details.
  14  *
  15  *      You should have received a copy of the GNU General Public License along
  16  *      with this program; if not, write to the Free Software Foundation, Inc.,
  17  *      675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  */
  20
  21 #ifndef _GNU_SOURCE
  22 #define _GNU_SOURCE 1
  23 #endif
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <sys/ioctl.h>
  31
  32 #include "../../udev_utils.h"
  33 #include "../../logging.h"
  34 #include "volume_id/volume_id.h"
  35 #include "volume_id/dasd.h"
  36
  37 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
  38
  39 #ifdef USE_LOG
  40 void log_message(int priority, const char *format, ...)
  41 {
  42         va_list args;
  43         static int udev_log = -1;
  44
  45         if (udev_log == -1) {
  46                 const char *value;
  47
  48                 value = getenv("UDEV_LOG");
  49                 if (value)
  50                         udev_log = log_priority(value);
  51                 else
  52                         udev_log = LOG_ERR;
  53         }
  54
  55         if (priority > udev_log)
  56                 return;
  57
  58         va_start(args, format);
  59         vsyslog(priority, format, args);
  60         va_end(args);
  61 }
  62 #endif
  63
  64 static void set_str(char *to, const unsigned char *from, int count)
  65 {
  66         int i, j;
  67         int len;
  68
  69         len = strnlen(from, count);
  70         while (isspace(from[len-1]))
  71                 len--;
  72
  73         i = 0;
  74         while (isspace(from[i]) && (i < len))
  75                 i++;
  76
  77         j = 0;
  78         while (i < len) {
  79                 switch(from[i]) {
  80                 case '/':
  81                         break;
  82                 case ' ':
  83                         to[j++] = '_';
  84                         break;
  85                 default:
  86                         to[j++] = from[i];
  87                 }
  88                 i++;
  89         }
  90         to[j] = '\0';
  91 }
  92
  93 int main(int argc, char *argv[])
  94 {
  95         const char help[] = "usage: vol_id [--export|-t|-l|-u] <device>\n"
  96                             "       --export\n"
  97                             "       -t filesystem type\n"
  98                             "       -l filesystem label\n"
  99                             "       -u filesystem uuid\n"
 100                             "\n";
 101         enum print_type {
 102                 PRINT_EXPORT,
 103                 PRINT_TYPE,
 104                 PRINT_LABEL,
 105                 PRINT_UUID,
 106         } print = PRINT_EXPORT;
 107         struct volume_id *vid = NULL;
 108         static char name[VOLUME_ID_LABEL_SIZE];
 109         int i;
 110         unsigned long long size;
 111         const char *node = NULL;
 112         int rc = 0;
 113
 114         logging_init("vol_id");
 115
 116         for (i = 1 ; i < argc; i++) {
 117                 char *arg = argv[i];
 118
 119                 if (strcmp(arg, "--export") == 0) {
 120                         print = PRINT_EXPORT;
 121                 } else if (strcmp(arg, "-t") == 0) {
 122                         print = PRINT_TYPE;
 123                 } else if (strcmp(arg, "-l") == 0) {
 124                         print = PRINT_LABEL;
 125                 } else if (strcmp(arg, "-u") == 0) {
 126                         print = PRINT_UUID;
 127                 } else
 128                         node = arg;
 129         }
 130         if (!node) {
 131                 err("no node specified");
 132                 fprintf(stderr, help);
 133                 rc = 1;
 134                 goto exit;
 135         }
 136
 137         vid = volume_id_open_node(node);
 138         if (vid == NULL) {
 139                 fprintf(stderr, "error open volume\n");
 140                 rc = 2;
 141                 goto exit;
 142         }
 143
 144         if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
 145                 size = 0;
 146
 147         if (volume_id_probe_all(vid, 0, size) == 0)
 148                 goto print;
 149
 150         if (volume_id_probe_dasd(vid) == 0)
 151                 goto print;
 152
 153         fprintf(stderr, "unknown volume type\n");
 154         rc = 3;
 155         goto exit;
 156
 157 print:
 158         set_str(name, vid->label, sizeof(vid->label));
 159
 160         switch (print) {
 161         case PRINT_EXPORT:
 162                 printf("ID_FS_USAGE=%s\n", vid->usage);
 163                 printf("ID_FS_TYPE=%s\n", vid->type);
 164                 printf("ID_FS_VERSION=%s\n", vid->type_version);
 165                 printf("ID_FS_UUID=%s\n", vid->uuid);
 166                 printf("ID_FS_LABEL=%s\n", vid->label);
 167                 printf("ID_FS_LABEL_SAFE=%s\n", name);
 168                 break;
 169         case PRINT_TYPE:
 170                 printf("%s\n", vid->type);
 171                 break;
 172         case PRINT_LABEL:
 173                 if (name[0] == '\0' ||
 174                     (vid->usage_id != VOLUME_ID_FILESYSTEM && vid->usage_id != VOLUME_ID_DISKLABEL)) {
 175                         rc = 3;
 176                         goto exit;
 177                 }
 178                 printf("%s\n", name);
 179                 break;
 180         case PRINT_UUID:
 181                 if (vid->uuid[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) {
 182                         rc = 4;
 183                         goto exit;
 184                 }
 185                 printf("%s\n", vid->uuid);
 186                 break;
 187         }
 188
 189 exit:
 190         if (vid != NULL)
 191                 volume_id_close(vid);
 192
 193         logging_close();
 194         return rc;
 195 }