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