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/*
* 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 priority, const char *format, ...)
{
va_list args;
static int udev_log = -1;
if (udev_log == -1) {
const char *value;
value = getenv("UDEV_LOG");
if (value)
udev_log = log_priority(value);
else
udev_log = LOG_ERR;
}
if (priority > udev_log)
return;
va_start(args, format);
vsyslog(priority, 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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