src/udev/udev-builtin-blkid.c

   1 /*
   2  * probe disks for filesystems and partitions
   3  *
   4  * Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
   5  * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
   6  *
   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.
  11  *
  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.
  16  *
  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/>.
  19  */
  20
  21 #include <blkid/blkid.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <getopt.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/stat.h>
  29
  30 #include "sd-id128.h"
  31
  32 #include "alloc-util.h"
  33 #include "efivars.h"
  34 #include "fd-util.h"
  35 #include "gpt.h"
  36 #include "string-util.h"
  37 #include "udev.h"
  38
  39 static void print_property(struct udev_device *dev, bool test, const char *name, const char *value) {
  40         char s[256];
  41
  42         s[0] = '\0';
  43
  44         if (streq(name, "TYPE")) {
  45                 udev_builtin_add_property(dev, test, "ID_FS_TYPE", value);
  46
  47         } else if (streq(name, "USAGE")) {
  48                 udev_builtin_add_property(dev, test, "ID_FS_USAGE", value);
  49
  50         } else if (streq(name, "VERSION")) {
  51                 udev_builtin_add_property(dev, test, "ID_FS_VERSION", value);
  52
  53         } else if (streq(name, "UUID")) {
  54                 blkid_safe_string(value, s, sizeof(s));
  55                 udev_builtin_add_property(dev, test, "ID_FS_UUID", s);
  56                 blkid_encode_string(value, s, sizeof(s));
  57                 udev_builtin_add_property(dev, test, "ID_FS_UUID_ENC", s);
  58
  59         } else if (streq(name, "UUID_SUB")) {
  60                 blkid_safe_string(value, s, sizeof(s));
  61                 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB", s);
  62                 blkid_encode_string(value, s, sizeof(s));
  63                 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB_ENC", s);
  64
  65         } else if (streq(name, "LABEL")) {
  66                 blkid_safe_string(value, s, sizeof(s));
  67                 udev_builtin_add_property(dev, test, "ID_FS_LABEL", s);
  68                 blkid_encode_string(value, s, sizeof(s));
  69                 udev_builtin_add_property(dev, test, "ID_FS_LABEL_ENC", s);
  70
  71         } else if (streq(name, "PTTYPE")) {
  72                 udev_builtin_add_property(dev, test, "ID_PART_TABLE_TYPE", value);
  73
  74         } else if (streq(name, "PTUUID")) {
  75                 udev_builtin_add_property(dev, test, "ID_PART_TABLE_UUID", value);
  76
  77         } else if (streq(name, "PART_ENTRY_NAME")) {
  78                 blkid_encode_string(value, s, sizeof(s));
  79                 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_NAME", s);
  80
  81         } else if (streq(name, "PART_ENTRY_TYPE")) {
  82                 blkid_encode_string(value, s, sizeof(s));
  83                 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_TYPE", s);
  84
  85         } else if (startswith(name, "PART_ENTRY_")) {
  86                 strscpyl(s, sizeof(s), "ID_", name, NULL);
  87                 udev_builtin_add_property(dev, test, s, value);
  88
  89         } else if (streq(name, "SYSTEM_ID")) {
  90                 blkid_encode_string(value, s, sizeof(s));
  91                 udev_builtin_add_property(dev, test, "ID_FS_SYSTEM_ID", s);
  92
  93         } else if (streq(name, "PUBLISHER_ID")) {
  94                 blkid_encode_string(value, s, sizeof(s));
  95                 udev_builtin_add_property(dev, test, "ID_FS_PUBLISHER_ID", s);
  96
  97         } else if (streq(name, "APPLICATION_ID")) {
  98                 blkid_encode_string(value, s, sizeof(s));
  99                 udev_builtin_add_property(dev, test, "ID_FS_APPLICATION_ID", s);
 100
 101         } else if (streq(name, "BOOT_SYSTEM_ID")) {
 102                 blkid_encode_string(value, s, sizeof(s));
 103                 udev_builtin_add_property(dev, test, "ID_FS_BOOT_SYSTEM_ID", s);
 104         }
 105 }
 106
 107 static int find_gpt_root(struct udev_device *dev, blkid_probe pr, bool test) {
 108
 109 #if defined(GPT_ROOT_NATIVE) && defined(ENABLE_EFI)
 110
 111         _cleanup_free_ char *root_id = NULL;
 112         bool found_esp = false;
 113         blkid_partlist pl;
 114         int i, nvals, r;
 115
 116         assert(pr);
 117
 118         /* Iterate through the partitions on this disk, and see if the
 119          * EFI ESP we booted from is on it. If so, find the first root
 120          * disk, and add a property indicating its partition UUID. */
 121
 122         errno = 0;
 123         pl = blkid_probe_get_partitions(pr);
 124         if (!pl)
 125                 return errno ? -errno : -ENOMEM;
 126
 127         nvals = blkid_partlist_numof_partitions(pl);
 128         for (i = 0; i < nvals; i++) {
 129                 blkid_partition pp;
 130                 const char *stype, *sid;
 131                 sd_id128_t type;
 132
 133                 pp = blkid_partlist_get_partition(pl, i);
 134                 if (!pp)
 135                         continue;
 136
 137                 sid = blkid_partition_get_uuid(pp);
 138                 if (!sid)
 139                         continue;
 140
 141                 stype = blkid_partition_get_type_string(pp);
 142                 if (!stype)
 143                         continue;
 144
 145                 if (sd_id128_from_string(stype, &type) < 0)
 146                         continue;
 147
 148                 if (sd_id128_equal(type, GPT_ESP)) {
 149                         sd_id128_t id, esp;
 150                         unsigned long long flags;
 151
 152                         flags = blkid_partition_get_flags(pp);
 153                         if (flags & GPT_FLAG_NO_AUTO)
 154                                 continue;
 155
 156                         /* We found an ESP, let's see if it matches
 157                          * the ESP we booted from. */
 158
 159                         if (sd_id128_from_string(sid, &id) < 0)
 160                                 continue;
 161
 162                         r = efi_loader_get_device_part_uuid(&esp);
 163                         if (r < 0)
 164                                 return r;
 165
 166                         if (sd_id128_equal(id, esp))
 167                                 found_esp = true;
 168
 169                 } else if (sd_id128_equal(type, GPT_ROOT_NATIVE)) {
 170
 171                         /* We found a suitable root partition, let's
 172                          * remember the first one. */
 173
 174                         if (!root_id) {
 175                                 root_id = strdup(sid);
 176                                 if (!root_id)
 177                                         return -ENOMEM;
 178                         }
 179                 }
 180         }
 181
 182         /* We found the ESP on this disk, and also found a root
 183          * partition, nice! Let's export its UUID */
 184         if (found_esp && root_id)
 185                 udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT_UUID", root_id);
 186 #endif
 187
 188         return 0;
 189 }
 190
 191 static int probe_superblocks(blkid_probe pr) {
 192         struct stat st;
 193         int rc;
 194
 195         if (fstat(blkid_probe_get_fd(pr), &st))
 196                 return -1;
 197
 198         blkid_probe_enable_partitions(pr, 1);
 199
 200         if (!S_ISCHR(st.st_mode) &&
 201             blkid_probe_get_size(pr) <= 1024 * 1440 &&
 202             blkid_probe_is_wholedisk(pr)) {
 203                 /*
 204                  * check if the small disk is partitioned, if yes then
 205                  * don't probe for filesystems.
 206                  */
 207                 blkid_probe_enable_superblocks(pr, 0);
 208
 209                 rc = blkid_do_fullprobe(pr);
 210                 if (rc < 0)
 211                         return rc;        /* -1 = error, 1 = nothing, 0 = success */
 212
 213                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 214                         return 0;        /* partition table detected */
 215         }
 216
 217         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 218         blkid_probe_enable_superblocks(pr, 1);
 219
 220         return blkid_do_safeprobe(pr);
 221 }
 222
 223 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test) {
 224         const char *root_partition;
 225         int64_t offset = 0;
 226         bool noraid = false;
 227         _cleanup_close_ int fd = -1;
 228         blkid_probe pr;
 229         const char *data;
 230         const char *name;
 231         const char *prtype = NULL;
 232         int nvals;
 233         int i;
 234         int err = 0;
 235         bool is_gpt = false;
 236
 237         static const struct option options[] = {
 238                 { "offset", optional_argument, NULL, 'o' },
 239                 { "noraid", no_argument, NULL, 'R' },
 240                 {}
 241         };
 242
 243         for (;;) {
 244                 int option;
 245
 246                 option = getopt_long(argc, argv, "oR", options, NULL);
 247                 if (option == -1)
 248                         break;
 249
 250                 switch (option) {
 251                 case 'o':
 252                         offset = strtoull(optarg, NULL, 0);
 253                         break;
 254                 case 'R':
 255                         noraid = true;
 256                         break;
 257                 }
 258         }
 259
 260         pr = blkid_new_probe();
 261         if (!pr)
 262                 return EXIT_FAILURE;
 263
 264         blkid_probe_set_superblocks_flags(pr,
 265                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 266                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 267                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION |
 268                 BLKID_SUBLKS_BADCSUM);
 269
 270         if (noraid)
 271                 blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
 272
 273         fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC);
 274         if (fd < 0) {
 275                 err = log_debug_errno(errno, "Failure opening block device %s: %m", udev_device_get_devnode(dev));
 276                 goto out;
 277         }
 278
 279         err = blkid_probe_set_device(pr, fd, offset, 0);
 280         if (err < 0)
 281                 goto out;
 282
 283         log_debug("probe %s %sraid offset=%"PRIi64,
 284                   udev_device_get_devnode(dev),
 285                   noraid ? "no" : "", offset);
 286
 287         err = probe_superblocks(pr);
 288         if (err < 0)
 289                 goto out;
 290         if (blkid_probe_has_value(pr, "SBBADCSUM")) {
 291                 if (!blkid_probe_lookup_value(pr, "TYPE", &prtype, NULL))
 292                         log_warning("incorrect %s checksum on %s",
 293                                     prtype, udev_device_get_devnode(dev));
 294                 else
 295                         log_warning("incorrect checksum on %s",
 296                                     udev_device_get_devnode(dev));
 297                 goto out;
 298         }
 299
 300         /* If we are a partition then our parent passed on the root
 301          * partition UUID to us */
 302         root_partition = udev_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID");
 303
 304         nvals = blkid_probe_numof_values(pr);
 305         for (i = 0; i < nvals; i++) {
 306                 if (blkid_probe_get_value(pr, i, &name, &data, NULL))
 307                         continue;
 308
 309                 print_property(dev, test, name, data);
 310
 311                 /* Is this a disk with GPT partition table? */
 312                 if (streq(name, "PTTYPE") && streq(data, "gpt"))
 313                         is_gpt = true;
 314
 315                 /* Is this a partition that matches the root partition
 316                  * property we inherited from our parent? */
 317                 if (root_partition && streq(name, "PART_ENTRY_UUID") && streq(data, root_partition))
 318                         udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT", "1");
 319         }
 320
 321         if (is_gpt)
 322                 find_gpt_root(dev, pr, test);
 323
 324         blkid_free_probe(pr);
 325 out:
 326         if (err < 0)
 327                 return EXIT_FAILURE;
 328
 329         return EXIT_SUCCESS;
 330 }
 331
 332 const struct udev_builtin udev_builtin_blkid = {
 333         .name = "blkid",
 334         .cmd = builtin_blkid,
 335         .help = "Filesystem and partition probing",
 336         .run_once = true,
 337 };