2 * probe disks for filesystems and partitions
4 * Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
5 * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
30 #include <blkid/blkid.h>
37 static void print_property(struct udev_device *dev, bool test, const char *name, const char *value) {
42 if (streq(name, "TYPE")) {
43 udev_builtin_add_property(dev, test, "ID_FS_TYPE", value);
45 } else if (streq(name, "USAGE")) {
46 udev_builtin_add_property(dev, test, "ID_FS_USAGE", value);
48 } else if (streq(name, "VERSION")) {
49 udev_builtin_add_property(dev, test, "ID_FS_VERSION", value);
51 } else if (streq(name, "UUID")) {
52 blkid_safe_string(value, s, sizeof(s));
53 udev_builtin_add_property(dev, test, "ID_FS_UUID", s);
54 blkid_encode_string(value, s, sizeof(s));
55 udev_builtin_add_property(dev, test, "ID_FS_UUID_ENC", s);
57 } else if (streq(name, "UUID_SUB")) {
58 blkid_safe_string(value, s, sizeof(s));
59 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB", s);
60 blkid_encode_string(value, s, sizeof(s));
61 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB_ENC", s);
63 } else if (streq(name, "LABEL")) {
64 blkid_safe_string(value, s, sizeof(s));
65 udev_builtin_add_property(dev, test, "ID_FS_LABEL", s);
66 blkid_encode_string(value, s, sizeof(s));
67 udev_builtin_add_property(dev, test, "ID_FS_LABEL_ENC", s);
69 } else if (streq(name, "PTTYPE")) {
70 udev_builtin_add_property(dev, test, "ID_PART_TABLE_TYPE", value);
72 } else if (streq(name, "PTUUID")) {
73 udev_builtin_add_property(dev, test, "ID_PART_TABLE_UUID", value);
75 } else if (streq(name, "PART_ENTRY_NAME")) {
76 blkid_encode_string(value, s, sizeof(s));
77 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_NAME", s);
79 } else if (streq(name, "PART_ENTRY_TYPE")) {
80 blkid_encode_string(value, s, sizeof(s));
81 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_TYPE", s);
83 } else if (startswith(name, "PART_ENTRY_")) {
84 strscpyl(s, sizeof(s), "ID_", name, NULL);
85 udev_builtin_add_property(dev, test, s, value);
87 } else if (streq(name, "SYSTEM_ID")) {
88 blkid_encode_string(value, s, sizeof(s));
89 udev_builtin_add_property(dev, test, "ID_FS_SYSTEM_ID", s);
91 } else if (streq(name, "PUBLISHER_ID")) {
92 blkid_encode_string(value, s, sizeof(s));
93 udev_builtin_add_property(dev, test, "ID_FS_PUBLISHER_ID", s);
95 } else if (streq(name, "APPLICATION_ID")) {
96 blkid_encode_string(value, s, sizeof(s));
97 udev_builtin_add_property(dev, test, "ID_FS_APPLICATION_ID", s);
99 } else if (streq(name, "BOOT_SYSTEM_ID")) {
100 blkid_encode_string(value, s, sizeof(s));
101 udev_builtin_add_property(dev, test, "ID_FS_BOOT_SYSTEM_ID", s);
105 static int find_gpt_root(struct udev_device *dev, blkid_probe pr, bool test) {
107 #if defined(GPT_ROOT_NATIVE) && defined(ENABLE_EFI)
109 _cleanup_free_ char *root_id = NULL;
110 bool found_esp = false;
116 /* Iterate through the partitions on this disk, and see if the
117 * EFI ESP we booted from is on it. If so, find the first root
118 * disk, and add a property indicating its partition UUID. */
121 pl = blkid_probe_get_partitions(pr);
123 return errno ? -errno : -ENOMEM;
125 nvals = blkid_partlist_numof_partitions(pl);
126 for (i = 0; i < nvals; i++) {
128 const char *stype, *sid;
131 pp = blkid_partlist_get_partition(pl, i);
135 sid = blkid_partition_get_uuid(pp);
139 stype = blkid_partition_get_type_string(pp);
143 if (sd_id128_from_string(stype, &type) < 0)
146 if (sd_id128_equal(type, GPT_ESP)) {
149 /* We found an ESP, let's see if it matches
150 * the ESP we booted from. */
152 if (sd_id128_from_string(sid, &id) < 0)
155 r = efi_loader_get_device_part_uuid(&esp);
159 if (sd_id128_equal(id, esp))
162 } else if (sd_id128_equal(type, GPT_ROOT_NATIVE)) {
164 /* We found a suitable root partition, let's
165 * remember the first one. */
168 root_id = strdup(sid);
175 /* We found the ESP on this disk, and also found a root
176 * partition, nice! Let's export its UUID */
177 if (found_esp && root_id)
178 udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT_UUID", root_id);
184 static int probe_superblocks(blkid_probe pr) {
188 if (fstat(blkid_probe_get_fd(pr), &st))
191 blkid_probe_enable_partitions(pr, 1);
193 if (!S_ISCHR(st.st_mode) &&
194 blkid_probe_get_size(pr) <= 1024 * 1440 &&
195 blkid_probe_is_wholedisk(pr)) {
197 * check if the small disk is partitioned, if yes then
198 * don't probe for filesystems.
200 blkid_probe_enable_superblocks(pr, 0);
202 rc = blkid_do_fullprobe(pr);
204 return rc; /* -1 = error, 1 = nothing, 0 = success */
206 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
207 return 0; /* partition table detected */
210 blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
211 blkid_probe_enable_superblocks(pr, 1);
213 return blkid_do_safeprobe(pr);
216 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test) {
217 const char *root_partition;
220 _cleanup_close_ int fd = -1;
224 const char *prtype = NULL;
230 static const struct option options[] = {
231 { "offset", optional_argument, NULL, 'o' },
232 { "noraid", no_argument, NULL, 'R' },
239 option = getopt_long(argc, argv, "oR", options, NULL);
245 offset = strtoull(optarg, NULL, 0);
253 pr = blkid_new_probe();
257 blkid_probe_set_superblocks_flags(pr,
258 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
259 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
260 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION |
261 BLKID_SUBLKS_BADCSUM);
264 blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
266 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC);
268 fprintf(stderr, "error: %s: %m\n", udev_device_get_devnode(dev));
272 err = blkid_probe_set_device(pr, fd, offset, 0);
276 log_debug("probe %s %sraid offset=%"PRIi64,
277 udev_device_get_devnode(dev),
278 noraid ? "no" : "", offset);
280 err = probe_superblocks(pr);
283 if (blkid_probe_has_value(pr, "SBBADCSUM")) {
284 if (!blkid_probe_lookup_value(pr, "TYPE", &prtype, NULL))
285 log_warning("incorrect %s checksum on %s",
286 prtype, udev_device_get_devnode(dev));
288 log_warning("incorrect checksum on %s",
289 udev_device_get_devnode(dev));
293 /* If we are a partition then our parent passed on the root
294 * partition UUID to us */
295 root_partition = udev_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID");
297 nvals = blkid_probe_numof_values(pr);
298 for (i = 0; i < nvals; i++) {
299 if (blkid_probe_get_value(pr, i, &name, &data, NULL))
302 print_property(dev, test, name, data);
304 /* Is this a disk with GPT partition table? */
305 if (streq(name, "PTTYPE") && streq(data, "gpt"))
308 /* Is this a partition that matches the root partition
309 * property we inherited from our parent? */
310 if (root_partition && streq(name, "PART_ENTRY_UUID") && streq(data, root_partition))
311 udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT", "1");
315 find_gpt_root(dev, pr, test);
317 blkid_free_probe(pr);
325 const struct udev_builtin udev_builtin_blkid = {
327 .cmd = builtin_blkid,
328 .help = "Filesystem and partition probing",