2 * vol_id - udev callout to read filesystem label and uuid
4 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <sys/ioctl.h>
33 #include "../../udev.h"
34 #include "libvolume_id/libvolume_id.h"
36 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
39 void log_message(int priority, const char *format, ...)
42 static int udev_log = -1;
47 value = getenv("UDEV_LOG");
49 udev_log = log_priority(value);
54 if (priority > udev_log)
57 va_start(args, format);
58 vsyslog(priority, format, args);
63 static void set_str(char *to, const char *from, size_t count)
67 /* strip trailing whitespace */
68 len = strnlen(from, count);
69 while (len && isspace(from[len-1]))
72 /* strip leading whitespace */
74 while (isspace(from[i]) && (i < len))
79 /* substitute multiple whitespace */
80 if (isspace(from[i])) {
81 while (isspace(from[i]))
95 int main(int argc, char *argv[])
97 const char help[] = "usage: vol_id [--export|-t|-l|-u] <device>\n"
99 " -t filesystem type\n"
100 " -l filesystem label\n"
101 " -u filesystem uuid\n"
108 } print = PRINT_EXPORT;
109 struct volume_id *vid = NULL;
110 static char name[VOLUME_ID_LABEL_SIZE];
113 const char *node = NULL;
118 logging_init("vol_id");
120 for (i = 1 ; i < argc; i++) {
123 if (strcmp(arg, "--export") == 0) {
124 print = PRINT_EXPORT;
125 } else if (strcmp(arg, "-t") == 0) {
127 } else if (strcmp(arg, "-l") == 0) {
129 } else if (strcmp(arg, "-u") == 0) {
135 err("no node specified");
136 fprintf(stderr, help);
141 vid = volume_id_open_node(node);
143 fprintf(stderr, "%s: error open volume\n", node);
148 if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
150 dbg("BLKGETSIZE64=%llu", size);
152 /* drop all privileges */
153 nobody_uid = lookup_user("nobody");
154 nobody_gid = lookup_group("nogroup");
155 if (nobody_uid > 0 && nobody_gid > 0) {
156 if (setgroups(0, NULL) != 0 ||
157 setgid(nobody_gid) != 0 ||
158 setuid(nobody_uid) != 0) {
164 if (volume_id_probe_all(vid, 0, size) == 0)
167 if (print != PRINT_EXPORT)
168 fprintf(stderr, "%s: unknown volume type\n", node);
173 set_str(name, vid->label, sizeof(vid->label));
174 replace_untrusted_chars(name);
178 printf("ID_FS_USAGE=%s\n", vid->usage);
179 printf("ID_FS_TYPE=%s\n", vid->type);
180 printf("ID_FS_VERSION=%s\n", vid->type_version);
181 printf("ID_FS_UUID=%s\n", vid->uuid);
182 printf("ID_FS_LABEL=%s\n", vid->label);
183 printf("ID_FS_LABEL_SAFE=%s\n", name);
186 printf("%s\n", vid->type);
189 if (name[0] == '\0' ||
190 (vid->usage_id != VOLUME_ID_FILESYSTEM && vid->usage_id != VOLUME_ID_DISKLABEL)) {
194 printf("%s\n", name);
197 if (vid->uuid[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) {
201 printf("%s\n", vid->uuid);
207 volume_id_close(vid);