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udev_volume_id.c

/*
 * udev_volume_id - udev callout to read filesystem label and uuid
 *
 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
 *
 *    sample udev rule for creation of a symlink with the filsystem uuid:
 *    KERNEL="sd*", PROGRAM="/sbin/udev_volume_id -u %N", SYMLINK="%c"
 *
 *    This program is free software; you can redistribute it and/or modify it
 *    under the terms of the GNU General Public License as published by the
 *    Free Software Foundation version 2 of the License.
 * 
 *    This program is distributed in the hope that it will be useful, but
 *    WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    General Public License for more details.
 * 
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <sys/ioctl.h>

#include "../../udev_utils.h"
#include "../../logging.h"
#include "volume_id/volume_id.h"
#include "volume_id/dasd.h"

#define BLKGETSIZE64 _IOR(0x12,114,size_t)

#ifdef USE_LOG
void log_message(int level, const char *format, ...)
{
      va_list args;

      va_start(args, format);
      vsyslog(level, format, args);
      va_end(args);
}
#endif

extern int optind;

int main(int argc, char *argv[])
{
      const char help[] = "usage: udev_volume_id [-t|-l|-u] <device>\n"
                      "       -t filesystem type\n"
                      "       -l filesystem label\n"
                      "       -u filesystem uuid\n"
                      "\n";
      static const char short_options[] = "htlu";
      struct volume_id *vid = NULL;
      const char *device;
      char print = 'a';
      static char name[VOLUME_ID_LABEL_SIZE];
      int len, i, j;
      unsigned long long size;
      int rc = 1;

      logging_init("udev_volume_id");

      while (1) {
            int option;

            option = getopt(argc, argv, short_options);
            if (option == -1)
                  break;

            switch (option) {
            case 't':
                  print = 't';
                  continue;
            case 'l':
                  print = 'l';
                  continue;
            case 'u':
                  print = 'u';
                  continue;
            case 'h':
            case '?':
            default:
                  printf(help);
                  exit(1);
            }
      }

      device = argv[optind];
      if (device == NULL) {
            printf(help);
            exit(1);
      }

      vid = volume_id_open_node(device);
      if (vid == NULL) {
            printf("error open volume\n");
            goto exit;
      }

      if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
            size = 0;

      if (volume_id_probe_all(vid, 0, size) == 0)
            goto print;

      if (volume_id_probe_dasd(vid) == 0)
            goto print;

      printf("unknown volume type\n");
      goto exit;


print:
      len = strnlen(vid->label, VOLUME_ID_LABEL_SIZE);

      /* remove trailing spaces */
      while (len > 0 && isspace(vid->label[len-1]))
            len--;
      name[len] = '\0';

      /* substitute chars */
      i = 0;
      j = 0;
      while (j < len) {
            switch(vid->label[j]) {
            case '/' :
                  break;
            case ' ' :
                  name[i++] = '_';
                  break;
            default :
                  name[i++] = vid->label[j];
            }
            j++;
      }
      name[i] = '\0';

      switch (print) {
      case 't':
            printf("%s\n", vid->type);
            break;
      case 'l':
            if (name[0] == '\0' ||
                (vid->usage_id != VOLUME_ID_FILESYSTEM && vid->usage_id != VOLUME_ID_DISKLABEL)) {
                  rc = 2;
                  goto exit;
            }
            printf("%s\n", name);
            break;
      case 'u':
            if (vid->uuid[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) {
                  rc = 2;
                  goto exit;
            }
            printf("%s\n", vid->uuid);
            break;
      case 'a':
            printf("F:%s\n", vid->usage);
            printf("T:%s\n", vid->type);
            printf("V:%s\n", vid->type_version);
            printf("L:%s\n", vid->label);
            printf("N:%s\n", name);
            printf("U:%s\n", vid->uuid);
      }
      rc = 0;

exit:
      if (vid != NULL)
            volume_id_close(vid);

      logging_close();

      exit(rc);
}

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