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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 -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 <ctype.h>
#include "../../libsysfs/sysfs/libsysfs.h"
#include "../../udev_lib.h"
#include "../../logging.h"
#include "volume_id.h"
#include "dasdlabel.h"
#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
void log_message(int level, const char *format, ...)
{
va_list args;
va_start(args, format);
vsyslog(level, format, args);
va_end(args);
}
#endif
static struct volume_id *open_classdev(struct sysfs_class_device *class_dev)
{
struct volume_id *vid;
struct sysfs_attribute *attr;
int major, minor;
attr = sysfs_get_classdev_attr(class_dev, "dev");
if (attr == NULL) {
printf("error reading 'dev' attribute\n");
return NULL;
}
if (sscanf(attr->value, "%u:%u", &major, &minor) != 2) {
printf("error getting major/minor number\n");
return NULL;
}
vid = volume_id_open_dev_t(makedev(major, minor));
if (vid == NULL) {
printf("error open volume\n");
return NULL;
}
return vid;
}
int main(int argc, char *argv[])
{
const char help[] = "usage: udev_volume_id [-t|-l|-u|-d]\n"
" -t filesystem type\n"
" -l filesystem label\n"
" -u filesystem uuid\n"
" -d disk label from main device\n"
"\n";
static const char short_options[] = "htlud";
int option;
char sysfs_path[SYSFS_PATH_MAX];
char dev_path[SYSFS_PATH_MAX];
struct sysfs_class_device *class_dev = NULL;
struct sysfs_class_device *class_dev_parent = NULL;
struct volume_id *vid = NULL;
char *devpath;
char probe = 'p';
char print = 'a';
char dasd_label[7];
static char name[VOLUME_ID_LABEL_SIZE];
int len, i, j;
int rc = 1;
while (1) {
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 'd':
probe = 'd';
continue;
case 'h':
case '?':
default:
printf(help);
exit(1);
}
}
devpath = getenv("DEVPATH");
if (devpath == NULL) {
printf("error DEVPATH empty\n");
goto exit;
}
if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
printf("error getting sysfs mount path\n");
goto exit;
}
strfieldcpy(dev_path, sysfs_path);
strfieldcat(dev_path, devpath);
class_dev = sysfs_open_class_device_path(dev_path);
if (class_dev == NULL) {
printf("error getting class device\n");
goto exit;
}
switch(probe) {
case 'p' :
/* open block device */
vid = open_classdev(class_dev);
if (vid == NULL)
goto exit;
if (volume_id_probe(vid, ALL) == 0)
goto print;
break;
case 'd' :
/* if we are on a partition, close it and open main block device */
class_dev_parent = sysfs_get_classdev_parent(class_dev);
if (class_dev_parent != NULL) {
volume_id_close(vid);
vid = open_classdev(class_dev_parent);
} else {
vid = open_classdev(class_dev_parent);
}
if (vid == NULL)
goto exit;
if (probe_ibm_partition(vid->fd, dasd_label) == 0) {
vid->fs_name = "dasd";
strncpy(vid->label_string, dasd_label, 6);
vid->label_string[6] = '\0';
goto print;
}
break;
}
printf("unknown volume type\n");
goto exit;
print:
len = strnlen(vid->label_string, VOLUME_ID_LABEL_SIZE);
/* remove trailing spaces */
while (len > 0 && isspace(vid->label_string[len-1]))
len--;
name[len] = '\0';
/* substitute chars */
i = 0;
j = 0;
while (j < len) {
switch(vid->label_string[j]) {
case '/' :
break;
case ' ' :
name[i++] = '_';
break;
default :
name[i++] = vid->label_string[j];
}
j++;
}
name[i] = '\0';
switch (print) {
case 't':
printf("%s\n", vid->fs_name);
break;
case 'l':
if (name[0] == '\0') {
rc = 2;
goto exit;
}
printf("%s\n", name);
break;
case 'u':
if (vid->uuid_string[0] == '\0') {
rc = 2;
goto exit;
}
printf("%s\n", vid->uuid_string);
break;
case 'a':
printf("T:%s\n", vid->fs_name);
printf("L:%s\n", vid->label_string);
printf("N:%s\n", name);
printf("U:%s\n", vid->uuid_string);
}
rc = 0;
exit:
if (class_dev != NULL)
sysfs_close_class_device(class_dev);
if (vid != NULL)
volume_id_close(vid);
exit(rc);
}
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