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ff694eca17
Here we get the logging for udev_volume_id working if it is compiled with DEBUG=true. Also fixed is a name clash with a global variable.
270 lines
5.7 KiB
C
270 lines
5.7 KiB
C
/*
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* udev_volume_id - udev callout to read filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* sample udev rule for creation of a symlink with the filsystem uuid:
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* KERNEL="sd*", PROGRAM="/sbin/udev_volume_id -u", SYMLINK="%c"
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <sys/ioctl.h>
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#include "../../libsysfs/sysfs/libsysfs.h"
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#include "../../udev_lib.h"
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#include "../../logging.h"
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#include "volume_id.h"
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#include "dasdlabel.h"
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#define BLKGETSIZE64 _IOR(0x12,114,size_t)
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#ifdef LOG
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unsigned char logname[LOGNAME_SIZE];
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void log_message(int level, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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vsyslog(level, format, args);
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va_end(args);
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}
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#endif
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static struct volume_id *open_classdev(struct sysfs_class_device *class_dev)
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{
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struct volume_id *vid;
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struct sysfs_attribute *attr;
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int major, minor;
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attr = sysfs_get_classdev_attr(class_dev, "dev");
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if (attr == NULL) {
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printf("error reading 'dev' attribute\n");
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return NULL;
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}
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if (sscanf(attr->value, "%u:%u", &major, &minor) != 2) {
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printf("error getting major/minor number\n");
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return NULL;
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}
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vid = volume_id_open_dev_t(makedev(major, minor));
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if (vid == NULL) {
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printf("error open volume\n");
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return NULL;
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}
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return vid;
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}
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static char *usage_id_name(enum volume_id_usage usage)
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{
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switch(usage) {
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case VOLUME_ID_UNUSED:
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return "unused";
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case VOLUME_ID_UNPROBED:
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return "unprobed";
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case VOLUME_ID_OTHER:
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return "other";
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case VOLUME_ID_PARTITIONTABLE:
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return "partitiontable";
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case VOLUME_ID_FILESYSTEM:
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return "filesystem";
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case VOLUME_ID_RAID:
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return "raid";
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default:
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return "unknown type_id";
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}
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}
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int main(int argc, char *argv[])
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{
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const char help[] = "usage: udev_volume_id [-t|-l|-u|-d]\n"
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" -t filesystem type\n"
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" -l filesystem label\n"
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" -u filesystem uuid\n"
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" -d disk label from main device\n"
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"\n";
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static const char short_options[] = "htlud";
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char sysfs_mnt_path[SYSFS_PATH_MAX];
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char dev_path[SYSFS_PATH_MAX];
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struct sysfs_class_device *class_dev = NULL;
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struct sysfs_class_device *class_dev_parent = NULL;
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struct volume_id *vid = NULL;
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char *devpath;
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char probe = 'p';
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char print = 'a';
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char dasd_label[7];
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static char name[VOLUME_ID_LABEL_SIZE];
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int len, i, j;
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unsigned long long size;
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int rc = 1;
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logging_init("udev_volume_id");
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while (1) {
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int option;
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option = getopt(argc, argv, short_options);
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if (option == -1)
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break;
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switch (option) {
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case 't':
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print = 't';
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continue;
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case 'l':
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print = 'l';
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continue;
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case 'u':
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print = 'u';
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continue;
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case 'd':
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probe = 'd';
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continue;
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case 'h':
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case '?':
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default:
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printf(help);
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exit(1);
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}
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}
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devpath = getenv("DEVPATH");
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if (devpath == NULL) {
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printf("error DEVPATH empty\n");
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goto exit;
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}
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if (sysfs_get_mnt_path(sysfs_mnt_path, SYSFS_PATH_MAX) != 0) {
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printf("error getting sysfs mount path\n");
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goto exit;
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}
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strfieldcpy(dev_path, sysfs_mnt_path);
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strfieldcat(dev_path, devpath);
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class_dev = sysfs_open_class_device_path(dev_path);
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if (class_dev == NULL) {
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printf("error getting class device\n");
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goto exit;
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}
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switch(probe) {
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case 'p' :
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/* open block device */
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vid = open_classdev(class_dev);
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if (vid == NULL)
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goto exit;
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if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
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size = 0;
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if (volume_id_probe(vid, VOLUME_ID_ALL, 0, size) == 0)
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goto print;
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break;
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case 'd' :
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/* if we are on a partition, open main block device instead */
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class_dev_parent = sysfs_get_classdev_parent(class_dev);
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if (class_dev_parent != NULL)
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vid = open_classdev(class_dev_parent);
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else
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vid = open_classdev(class_dev_parent);
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if (vid == NULL)
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goto exit;
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if (probe_ibm_partition(vid->fd, dasd_label) == 0) {
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vid->type = "dasd";
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strncpy(vid->label, dasd_label, 6);
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vid->label[6] = '\0';
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goto print;
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}
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break;
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}
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printf("unknown volume type\n");
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goto exit;
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print:
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len = strnlen(vid->label, VOLUME_ID_LABEL_SIZE);
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/* remove trailing spaces */
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while (len > 0 && isspace(vid->label[len-1]))
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len--;
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name[len] = '\0';
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/* substitute chars */
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i = 0;
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j = 0;
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while (j < len) {
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switch(vid->label[j]) {
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case '/' :
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break;
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case ' ' :
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name[i++] = '_';
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break;
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default :
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name[i++] = vid->label[j];
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}
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j++;
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}
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name[i] = '\0';
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switch (print) {
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case 't':
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printf("%s\n", vid->type);
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break;
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case 'l':
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if (name[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) {
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rc = 2;
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goto exit;
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}
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printf("%s\n", name);
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break;
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case 'u':
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if (vid->uuid[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) {
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rc = 2;
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goto exit;
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}
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printf("%s\n", vid->uuid);
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break;
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case 'a':
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printf("F:%s\n", usage_id_name(vid->usage_id));
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printf("T:%s\n", vid->type);
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printf("V:%s\n", vid->type_version);
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printf("L:%s\n", vid->label);
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printf("N:%s\n", name);
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printf("U:%s\n", vid->uuid);
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}
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rc = 0;
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exit:
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if (class_dev != NULL)
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sysfs_close_class_device(class_dev);
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if (vid != NULL)
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volume_id_close(vid);
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logging_close();
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exit(rc);
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}
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