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",