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/*
* udev_volume_id - udev callout to read filesystem label and uuid
*
* Copyright (C) 2004 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 -M%M -m%m -u", 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.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "volume_id.h"
int main(int argc, char *argv[])
{
struct volume_id *vid;
const char help[] = "usage: udev_volume_id -m<minor> -M<major> [-t|-l|-u]\n";
int major = -1;
int minor = -1;
char *tail;
static const char short_options[] = "M:m:htlu";
int option;
char print = '\0';
int rc;
while (1) {
option = getopt(argc, argv, short_options);
if (option == -1)
break;
switch (option) {
case 'M':
major = (int) strtoul(optarg, &tail, 10);
if (tail[0] != '\0') {
printf("invalid major\n");
exit(1);
}
break;
case 'm':
minor = (int) strtoul(optarg, &tail, 10);
if (tail[0] != '\0') {
printf("invalid minor\n");
exit(1);
}
break;
case 't':
print = 't';
break;
case 'l':
print = 'l';
break;
case 'u':
print = 'u';
break;
case 'h':
case '?':
default:
printf(help);
exit(1);
}
}
if (major == -1 || minor == -1) {
printf(help);
exit(1);
}
vid = volume_id_open_dev_t(makedev(major, minor));
if (vid == NULL) {
printf("error open volume\n");
exit(1);
}
rc = volume_id_probe(vid, ALL);
if (rc != 0) {
printf("error probing volume\n");
exit(1);
}
switch (print) {
case 't':
printf("%s\n", vid->fs_name);
break;
case 'l':
if (vid->label_string[0] == '\0')
exit(2);
printf("%s\n", vid->label_string);
break;
case 'u':
if (vid->uuid_string[0] == '\0')
exit(2);
printf("%s\n", vid->uuid_string);
break;
default:
printf("T:%s\n", vid->fs_name);
printf("L:%s\n", vid->label_string);
printf("U:%s\n", vid->uuid_string);
}
volume_id_close(vid);
exit(0);
}
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