2 * vol_id - read filesystem label and uuid
4 * Copyright (C) 2005-2006 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 "lib/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 vid_log(int priority, const char *file, int line, const char *format, ...)
68 va_start(args, format);
69 log_message(priority, format, args);
75 static void set_str(char *to, const char *from, size_t count)
79 /* strip trailing whitespace */
80 len = strnlen(from, count);
81 while (len && isspace(from[len-1]))
84 /* strip leading whitespace */
86 while (isspace(from[i]) && (i < len))
91 /* substitute multiple whitespace */
92 if (isspace(from[i])) {
93 while (isspace(from[i]))
107 int main(int argc, char *argv[])
109 const char help[] = "usage: vol_id [--export|-t|-l|-u] <device>\n"
111 " -t filesystem type\n"
112 " -l filesystem label\n"
113 " -u filesystem uuid\n"
120 } print = PRINT_EXPORT;
121 struct volume_id *vid = NULL;
122 static char name[VOLUME_ID_LABEL_SIZE];
125 const char *node = NULL;
130 logging_init("vol_id");
132 /* hook in our debug into libvolume_id */
133 volume_id_log_fn = vid_log;
135 for (i = 1 ; i < argc; i++) {
138 if (strcmp(arg, "--export") == 0) {
139 print = PRINT_EXPORT;
140 } else if (strcmp(arg, "-t") == 0) {
142 } else if (strcmp(arg, "-l") == 0) {
144 } else if (strcmp(arg, "-u") == 0) {
150 err("no node specified");
151 fprintf(stderr, help);
156 vid = volume_id_open_node(node);
158 fprintf(stderr, "%s: error open volume\n", node);
163 if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
165 dbg("BLKGETSIZE64=%llu", size);
167 /* drop all privileges */
168 nobody_uid = lookup_user("nobody");
169 nobody_gid = lookup_group("nogroup");
170 if (nobody_uid > 0 && nobody_gid > 0) {
171 if (setgroups(0, NULL) != 0 ||
172 setgid(nobody_gid) != 0 ||
173 setuid(nobody_uid) != 0) {
179 if (volume_id_probe_all(vid, 0, size) == 0)
182 if (print != PRINT_EXPORT)
183 fprintf(stderr, "%s: unknown volume type\n", node);
188 set_str(name, vid->label, sizeof(vid->label));
189 replace_untrusted_chars(name);
193 printf("ID_FS_USAGE=%s\n", vid->usage);
194 printf("ID_FS_TYPE=%s\n", vid->type);
195 printf("ID_FS_VERSION=%s\n", vid->type_version);
196 printf("ID_FS_UUID=%s\n", vid->uuid);
197 printf("ID_FS_LABEL=%s\n", vid->label);
198 printf("ID_FS_LABEL_SAFE=%s\n", name);
201 printf("%s\n", vid->type);
204 if (name[0] == '\0' ||
205 (vid->usage_id != VOLUME_ID_FILESYSTEM && vid->usage_id != VOLUME_ID_DISKLABEL)) {
209 printf("%s\n", name);
212 if (vid->uuid[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) {
216 printf("%s\n", vid->uuid);
222 volume_id_close(vid);