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)
43 if (streq(name, "TYPE")) {
44 udev_builtin_add_property(dev, test, "ID_FS_TYPE", value);
46 } else if (streq(name, "USAGE")) {
47 udev_builtin_add_property(dev, test, "ID_FS_USAGE", value);
49 } else if (streq(name, "VERSION")) {
50 udev_builtin_add_property(dev, test, "ID_FS_VERSION", value);
52 } else if (streq(name, "UUID")) {
53 blkid_safe_string(value, s, sizeof(s));
54 udev_builtin_add_property(dev, test, "ID_FS_UUID", s);
55 blkid_encode_string(value, s, sizeof(s));
56 udev_builtin_add_property(dev, test, "ID_FS_UUID_ENC", s);
58 } else if (streq(name, "UUID_SUB")) {
59 blkid_safe_string(value, s, sizeof(s));
60 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB", s);
61 blkid_encode_string(value, s, sizeof(s));
62 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB_ENC", s);
64 } else if (streq(name, "LABEL")) {
65 blkid_safe_string(value, s, sizeof(s));
66 udev_builtin_add_property(dev, test, "ID_FS_LABEL", s);
67 blkid_encode_string(value, s, sizeof(s));
68 udev_builtin_add_property(dev, test, "ID_FS_LABEL_ENC", s);
70 } else if (streq(name, "PTTYPE")) {
71 udev_builtin_add_property(dev, test, "ID_PART_TABLE_TYPE", value);
73 } else if (streq(name, "PTUUID")) {
74 udev_builtin_add_property(dev, test, "ID_PART_TABLE_UUID", value);
76 } else if (streq(name, "PART_ENTRY_NAME")) {
77 blkid_encode_string(value, s, sizeof(s));
78 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_NAME", s);
80 } else if (streq(name, "PART_ENTRY_TYPE")) {
81 blkid_encode_string(value, s, sizeof(s));
82 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_TYPE", s);
84 } else if (startswith(name, "PART_ENTRY_")) {
85 strscpyl(s, sizeof(s), "ID_", name, NULL);
86 udev_builtin_add_property(dev, test, s, value);
88 } else if (streq(name, "SYSTEM_ID")) {
89 blkid_encode_string(value, s, sizeof(s));
90 udev_builtin_add_property(dev, test, "ID_FS_SYSTEM_ID", s);
92 } else if (streq(name, "PUBLISHER_ID")) {
93 blkid_encode_string(value, s, sizeof(s));
94 udev_builtin_add_property(dev, test, "ID_FS_PUBLISHER_ID", s);
96 } else if (streq(name, "APPLICATION_ID")) {
97 blkid_encode_string(value, s, sizeof(s));
98 udev_builtin_add_property(dev, test, "ID_FS_APPLICATION_ID", s);
100 } else if (streq(name, "BOOT_SYSTEM_ID")) {
101 blkid_encode_string(value, s, sizeof(s));
102 udev_builtin_add_property(dev, test, "ID_FS_BOOT_SYSTEM_ID", s);
106 static int find_gpt_root(struct udev_device *dev, blkid_probe pr, bool test) {
108 #if defined(GPT_ROOT_NATIVE) && defined(ENABLE_EFI)
110 _cleanup_free_ char *root_id = NULL;
111 bool found_esp = false;
117 /* Iterate through the partitions on this disk, and see if the
118 * EFI ESP we booted from is on it. If so, find the first root
119 * disk, and add a property indicating its partition UUID. */
122 pl = blkid_probe_get_partitions(pr);
124 return errno ? -errno : -ENOMEM;
126 nvals = blkid_partlist_numof_partitions(pl);
127 for (i = 0; i < nvals; i++) {
129 const char *stype, *sid;
132 pp = blkid_partlist_get_partition(pl, i);
136 sid = blkid_partition_get_uuid(pp);
140 stype = blkid_partition_get_type_string(pp);
144 if (sd_id128_from_string(stype, &type) < 0)
147 if (sd_id128_equal(type, GPT_ESP)) {
150 /* We found an ESP, let's see if it matches
151 * the ESP we booted from. */
153 if (sd_id128_from_string(sid, &id) < 0)
156 r = efi_loader_get_device_part_uuid(&esp);
160 if (sd_id128_equal(id, esp))
163 } else if (sd_id128_equal(type, GPT_ROOT_NATIVE)) {
165 /* We found a suitable root partition, let's
166 * remember the first one. */
169 root_id = strdup(sid);
176 /* We found the ESP on this disk, and also found a root
177 * partition, nice! Let's export its UUID */
178 if (found_esp && root_id)
179 udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT_UUID", root_id);
185 static int probe_superblocks(blkid_probe pr)
190 if (fstat(blkid_probe_get_fd(pr), &st))
193 blkid_probe_enable_partitions(pr, 1);
195 if (!S_ISCHR(st.st_mode) &&
196 blkid_probe_get_size(pr) <= 1024 * 1440 &&
197 blkid_probe_is_wholedisk(pr)) {
199 * check if the small disk is partitioned, if yes then
200 * don't probe for filesystems.
202 blkid_probe_enable_superblocks(pr, 0);
204 rc = blkid_do_fullprobe(pr);
206 return rc; /* -1 = error, 1 = nothing, 0 = success */
208 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
209 return 0; /* partition table detected */
212 blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
213 blkid_probe_enable_superblocks(pr, 1);
215 return blkid_do_safeprobe(pr);
218 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test)
220 const char *root_partition;
223 _cleanup_close_ int fd = -1;
232 static const struct option options[] = {
233 { "offset", optional_argument, NULL, 'o' },
234 { "noraid", no_argument, NULL, 'R' },
241 option = getopt_long(argc, argv, "oR", options, NULL);
247 offset = strtoull(optarg, NULL, 0);
255 pr = blkid_new_probe();
259 blkid_probe_set_superblocks_flags(pr,
260 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
261 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
262 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
265 blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
267 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC);
269 fprintf(stderr, "error: %s: %m\n", udev_device_get_devnode(dev));
273 err = blkid_probe_set_device(pr, fd, offset, 0);
277 log_debug("probe %s %sraid offset=%llu",
278 udev_device_get_devnode(dev),
279 noraid ? "no" : "", (unsigned long long) offset);
281 err = probe_superblocks(pr);
285 /* If we are a partition then our parent passed on the root
286 * partition UUID to us */
287 root_partition = udev_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID");
289 nvals = blkid_probe_numof_values(pr);
290 for (i = 0; i < nvals; i++) {
291 if (blkid_probe_get_value(pr, i, &name, &data, NULL))
294 print_property(dev, test, name, data);
296 /* Is this a disk with GPT partition table? */
297 if (streq(name, "PTTYPE") && streq(data, "gpt"))
300 /* Is this a partition that matches the root partition
301 * property we inherited from our parent? */
302 if (root_partition && streq(name, "PART_ENTRY_UUID") && streq(data, root_partition))
303 udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT", "1");
307 find_gpt_root(dev, pr, test);
309 blkid_free_probe(pr);
317 const struct udev_builtin udev_builtin_blkid = {
319 .cmd = builtin_blkid,
320 .help = "filesystem and partition probing",