2 * vol_id - read filesystem label and uuid
4 * Copyright (C) 2005-2008 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
35 #include <sys/ioctl.h>
37 #include "../../udev/udev.h"
38 #include "lib/libvolume_id.h"
40 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
43 struct udev *udev_ctx;
45 static void log_fn(struct udev *udev, int priority,
46 const char *file, int line, const char *fn,
47 const char *format, va_list args)
50 fprintf(stderr, "%s: ", fn != NULL ? fn : file);
51 vfprintf(stderr, format, args);
53 vsyslog(priority, format, args);
57 static void vid_log(int priority, const char *file, int line, const char *format, ...)
61 if (priority > udev_get_log_priority(udev_ctx))
63 va_start(args, format);
64 log_fn(udev_ctx, priority, file, line, NULL, format, args);
69 static void set_str(char *to, const char *from, size_t count)
73 /* strip trailing whitespace */
74 len = strnlen(from, count);
75 while (len && isspace(from[len-1]))
78 /* strip leading whitespace */
80 while (isspace(from[i]) && (i < len))
85 /* substitute multiple whitespace */
86 if (isspace(from[i])) {
87 while (isspace(from[i]))
101 static int all_probers(volume_id_probe_fn_t probe_fn,
102 struct volume_id *id, uint64_t off, uint64_t size,
107 if (probe_fn(id, off, size) == 0)
108 if (volume_id_get_type(id, &type))
109 printf("%s\n", type);
114 int main(int argc, char *argv[])
116 static const struct option options[] = {
117 { "label", no_argument, NULL, 'l' },
118 { "label-raw", no_argument, NULL, 'L' },
119 { "uuid", no_argument, NULL, 'u' },
120 { "type", no_argument, NULL, 't' },
121 { "export", no_argument, NULL, 'x' },
122 { "skip-raid", no_argument, NULL, 's' },
123 { "size", required_argument, NULL, 'S' },
124 { "probe-all", no_argument, NULL, 'a' },
125 { "offset", optional_argument, NULL, 'o' },
126 { "debug", no_argument, NULL, 'd' },
127 { "help", no_argument, NULL, 'h' },
137 } print = PRINT_EXPORT;
139 struct volume_id *vid = NULL;
140 char label_safe[256];
145 char type_version_enc[256];
152 const char *label, *uuid, *type, *type_version, *usage;
156 udev_ctx = udev_new();
157 if (udev_ctx == NULL)
159 logging_init("vol_id");
160 udev_set_log_fn(udev_ctx, log_fn);
162 /* hook in our debug into libvolume_id */
163 volume_id_log_fn = vid_log;
168 option = getopt_long(argc, argv, "lLutxsS:aodh", options, NULL);
175 if (udev_get_log_priority(udev_ctx) < LOG_INFO)
176 udev_set_log_priority(udev_ctx, LOG_INFO);
182 print = PRINT_LABEL_RAW;
191 print = PRINT_EXPORT;
200 if (optarg[0] != '\0')
201 size = strtoull(optarg, NULL, 0);
204 if (optarg[0] != '\0')
205 offset = strtoull(optarg, NULL, 0);
208 printf("Usage: vol_id [options] <device>\n"
209 " --export export key/value pairs\n"
210 " --type filesystem type\n"
211 " --label filesystem label\n"
212 " --label-raw raw label\n"
213 " --uuid filesystem uuid\n"
214 " --skip-raid don't probe for raid\n"
215 " --probe-all find possibly conflicting signatures\n"
216 " --offset=<bytes> probe at the given offset\n"
217 " --size=<bytes> overwrite device size\n"
218 " --debug print debug output to stderr\n"
229 err(udev_ctx, "no device\n");
230 fprintf(stderr, "no device\n");
235 fd = open(node, O_RDONLY);
237 fprintf(stderr, "%s: error opening volume\n", node);
242 vid = volume_id_open_fd(fd);
249 if (ioctl(fd, BLKGETSIZE64, &size) != 0)
251 info(udev_ctx, "BLKGETSIZE64=%" PRIu64 " (%" PRIu64 "GB)\n", size, size >> 30);
254 /* try to drop all privileges before reading disk content */
258 pw = getpwnam("nobody");
259 if (pw != NULL && pw->pw_uid > 0 && pw->pw_gid > 0) {
260 if (setgroups(0, NULL) != 0 ||
261 setgid(pw->pw_gid) != 0 ||
262 setuid(pw->pw_uid) != 0)
263 info(udev_ctx, "unable to drop privileges: %s\n\n", strerror(errno));
268 volume_id_all_probers(all_probers, vid, offset, size, NULL);
273 retval = volume_id_probe_filesystem(vid, offset, size);
275 retval = volume_id_probe_all(vid, offset, size);
277 fprintf(stderr, "%s: unknown volume type\n", node);
282 if (!volume_id_get_label(vid, &label) ||
283 !volume_id_get_usage(vid, &usage) ||
284 !volume_id_get_type(vid, &type) ||
285 !volume_id_get_type_version(vid, &type_version) ||
286 !volume_id_get_uuid(vid, &uuid)) {
291 set_str(label_safe, label, sizeof(label_safe));
292 util_replace_chars(label_safe, ALLOWED_CHARS_INPUT);
293 volume_id_encode_string(label, label_enc, sizeof(label_enc));
295 set_str(uuid_safe, uuid, sizeof(uuid_safe));
296 util_replace_chars(uuid_safe, ALLOWED_CHARS_INPUT);
297 volume_id_encode_string(uuid, uuid_enc, sizeof(uuid_enc));
299 volume_id_encode_string(type, type_enc, sizeof(type_enc));
300 volume_id_encode_string(type_version, type_version_enc, sizeof(type_version_enc));
304 printf("ID_FS_USAGE=%s\n", usage);
305 printf("ID_FS_TYPE=%s\n", type_enc);
306 printf("ID_FS_VERSION=%s\n", type_version_enc);
307 printf("ID_FS_UUID=%s\n", uuid_safe);
308 printf("ID_FS_UUID_ENC=%s\n", uuid_enc);
309 printf("ID_FS_LABEL=%s\n", label_safe);
310 printf("ID_FS_LABEL_ENC=%s\n", label_enc);
313 printf("%s\n", type);
316 if (label_safe[0] == '\0' || strcmp(usage, "raid") == 0) {
320 printf("%s\n", label_safe);
323 if (uuid_enc[0] == '\0' || strcmp(usage, "raid") == 0) {
327 printf("%s\n", uuid_enc);
329 case PRINT_LABEL_RAW:
330 if (label[0] == '\0' || strcmp(usage, "raid") == 0) {
334 printf("%s\n", label);
340 volume_id_close(vid);
341 udev_unref(udev_ctx);