src/udev/udev-builtin-blkid.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /*
   4  * probe disks for filesystems and partitions
   5  *
   6  * Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
   7  * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation, either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include <blkid/blkid.h>
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <getopt.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <sys/stat.h>
  31
  32 #include "sd-id128.h"
  33
  34 #include "alloc-util.h"
  35 #include "efivars.h"
  36 #include "fd-util.h"
  37 #include "gpt.h"
  38 #include "string-util.h"
  39 #include "udev.h"
  40
  41 static void print_property(struct udev_device *dev, bool test, const char *name, const char *value) {
  42         char s[256];
  43
  44         s[0] = '\0';
  45
  46         if (streq(name, "TYPE")) {
  47                 udev_builtin_add_property(dev, test, "ID_FS_TYPE", value);
  48
  49         } else if (streq(name, "USAGE")) {
  50                 udev_builtin_add_property(dev, test, "ID_FS_USAGE", value);
  51
  52         } else if (streq(name, "VERSION")) {
  53                 udev_builtin_add_property(dev, test, "ID_FS_VERSION", value);
  54
  55         } else if (streq(name, "UUID")) {
  56                 blkid_safe_string(value, s, sizeof(s));
  57                 udev_builtin_add_property(dev, test, "ID_FS_UUID", s);
  58                 blkid_encode_string(value, s, sizeof(s));
  59                 udev_builtin_add_property(dev, test, "ID_FS_UUID_ENC", s);
  60
  61         } else if (streq(name, "UUID_SUB")) {
  62                 blkid_safe_string(value, s, sizeof(s));
  63                 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB", s);
  64                 blkid_encode_string(value, s, sizeof(s));
  65                 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB_ENC", s);
  66
  67         } else if (streq(name, "LABEL")) {
  68                 blkid_safe_string(value, s, sizeof(s));
  69                 udev_builtin_add_property(dev, test, "ID_FS_LABEL", s);
  70                 blkid_encode_string(value, s, sizeof(s));
  71                 udev_builtin_add_property(dev, test, "ID_FS_LABEL_ENC", s);
  72
  73         } else if (streq(name, "PTTYPE")) {
  74                 udev_builtin_add_property(dev, test, "ID_PART_TABLE_TYPE", value);
  75
  76         } else if (streq(name, "PTUUID")) {
  77                 udev_builtin_add_property(dev, test, "ID_PART_TABLE_UUID", value);
  78
  79         } else if (streq(name, "PART_ENTRY_NAME")) {
  80                 blkid_encode_string(value, s, sizeof(s));
  81                 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_NAME", s);
  82
  83         } else if (streq(name, "PART_ENTRY_TYPE")) {
  84                 blkid_encode_string(value, s, sizeof(s));
  85                 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_TYPE", s);
  86
  87         } else if (startswith(name, "PART_ENTRY_")) {
  88                 strscpyl(s, sizeof(s), "ID_", name, NULL);
  89                 udev_builtin_add_property(dev, test, s, value);
  90
  91         } else if (streq(name, "SYSTEM_ID")) {
  92                 blkid_encode_string(value, s, sizeof(s));
  93                 udev_builtin_add_property(dev, test, "ID_FS_SYSTEM_ID", s);
  94
  95         } else if (streq(name, "PUBLISHER_ID")) {
  96                 blkid_encode_string(value, s, sizeof(s));
  97                 udev_builtin_add_property(dev, test, "ID_FS_PUBLISHER_ID", s);
  98
  99         } else if (streq(name, "APPLICATION_ID")) {
 100                 blkid_encode_string(value, s, sizeof(s));
 101                 udev_builtin_add_property(dev, test, "ID_FS_APPLICATION_ID", s);
 102
 103         } else if (streq(name, "BOOT_SYSTEM_ID")) {
 104                 blkid_encode_string(value, s, sizeof(s));
 105                 udev_builtin_add_property(dev, test, "ID_FS_BOOT_SYSTEM_ID", s);
 106         }
 107 }
 108
 109 static int find_gpt_root(struct udev_device *dev, blkid_probe pr, bool test) {
 110
 111 #if defined(GPT_ROOT_NATIVE) && defined(ENABLE_EFI)
 112
 113         _cleanup_free_ char *root_id = NULL;
 114         bool found_esp = false;
 115         blkid_partlist pl;
 116         int i, nvals, r;
 117
 118         assert(pr);
 119
 120         /* Iterate through the partitions on this disk, and see if the
 121          * EFI ESP we booted from is on it. If so, find the first root
 122          * disk, and add a property indicating its partition UUID. */
 123
 124         errno = 0;
 125         pl = blkid_probe_get_partitions(pr);
 126         if (!pl)
 127                 return errno > 0 ? -errno : -ENOMEM;
 128
 129         nvals = blkid_partlist_numof_partitions(pl);
 130         for (i = 0; i < nvals; i++) {
 131                 blkid_partition pp;
 132                 const char *stype, *sid;
 133                 sd_id128_t type;
 134
 135                 pp = blkid_partlist_get_partition(pl, i);
 136                 if (!pp)
 137                         continue;
 138
 139                 sid = blkid_partition_get_uuid(pp);
 140                 if (!sid)
 141                         continue;
 142
 143                 stype = blkid_partition_get_type_string(pp);
 144                 if (!stype)
 145                         continue;
 146
 147                 if (sd_id128_from_string(stype, &type) < 0)
 148                         continue;
 149
 150                 if (sd_id128_equal(type, GPT_ESP)) {
 151                         sd_id128_t id, esp;
 152                         unsigned long long flags;
 153
 154                         flags = blkid_partition_get_flags(pp);
 155                         if (flags & GPT_FLAG_NO_AUTO)
 156                                 continue;
 157
 158                         /* We found an ESP, let's see if it matches
 159                          * the ESP we booted from. */
 160
 161                         if (sd_id128_from_string(sid, &id) < 0)
 162                                 continue;
 163
 164                         r = efi_loader_get_device_part_uuid(&esp);
 165                         if (r < 0)
 166                                 return r;
 167
 168                         if (sd_id128_equal(id, esp))
 169                                 found_esp = true;
 170
 171                 } else if (sd_id128_equal(type, GPT_ROOT_NATIVE)) {
 172
 173                         /* We found a suitable root partition, let's
 174                          * remember the first one. */
 175
 176                         if (!root_id) {
 177                                 root_id = strdup(sid);
 178                                 if (!root_id)
 179                                         return -ENOMEM;
 180                         }
 181                 }
 182         }
 183
 184         /* We found the ESP on this disk, and also found a root
 185          * partition, nice! Let's export its UUID */
 186         if (found_esp && root_id)
 187                 udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT_UUID", root_id);
 188 #endif
 189
 190         return 0;
 191 }
 192
 193 static int probe_superblocks(blkid_probe pr) {
 194         struct stat st;
 195         int rc;
 196
 197         if (fstat(blkid_probe_get_fd(pr), &st))
 198                 return -1;
 199
 200         blkid_probe_enable_partitions(pr, 1);
 201
 202         if (!S_ISCHR(st.st_mode) &&
 203             blkid_probe_get_size(pr) <= 1024 * 1440 &&
 204             blkid_probe_is_wholedisk(pr)) {
 205                 /*
 206                  * check if the small disk is partitioned, if yes then
 207                  * don't probe for filesystems.
 208                  */
 209                 blkid_probe_enable_superblocks(pr, 0);
 210
 211                 rc = blkid_do_fullprobe(pr);
 212                 if (rc < 0)
 213                         return rc;        /* -1 = error, 1 = nothing, 0 = success */
 214
 215                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 216                         return 0;        /* partition table detected */
 217         }
 218
 219         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 220         blkid_probe_enable_superblocks(pr, 1);
 221
 222         return blkid_do_safeprobe(pr);
 223 }
 224
 225 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test) {
 226         const char *root_partition;
 227         int64_t offset = 0;
 228         bool noraid = false;
 229         _cleanup_close_ int fd = -1;
 230         blkid_probe pr;
 231         const char *data;
 232         const char *name;
 233         const char *prtype = NULL;
 234         int nvals;
 235         int i;
 236         int err = 0;
 237         bool is_gpt = false;
 238
 239         static const struct option options[] = {
 240                 { "offset", optional_argument, NULL, 'o' },
 241                 { "noraid", no_argument, NULL, 'R' },
 242                 {}
 243         };
 244
 245         for (;;) {
 246                 int option;
 247
 248                 option = getopt_long(argc, argv, "oR", options, NULL);
 249                 if (option == -1)
 250                         break;
 251
 252                 switch (option) {
 253                 case 'o':
 254                         offset = strtoull(optarg, NULL, 0);
 255                         break;
 256                 case 'R':
 257                         noraid = true;
 258                         break;
 259                 }
 260         }
 261
 262         pr = blkid_new_probe();
 263         if (!pr)
 264                 return EXIT_FAILURE;
 265
 266         blkid_probe_set_superblocks_flags(pr,
 267                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 268                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 269                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION |
 270                 BLKID_SUBLKS_BADCSUM);
 271
 272         if (noraid)
 273                 blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
 274
 275         fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC);
 276         if (fd < 0) {
 277                 err = log_debug_errno(errno, "Failure opening block device %s: %m", udev_device_get_devnode(dev));
 278                 goto out;
 279         }
 280
 281         err = blkid_probe_set_device(pr, fd, offset, 0);
 282         if (err < 0)
 283                 goto out;
 284
 285         log_debug("probe %s %sraid offset=%"PRIi64,
 286                   udev_device_get_devnode(dev),
 287                   noraid ? "no" : "", offset);
 288
 289         err = probe_superblocks(pr);
 290         if (err < 0)
 291                 goto out;
 292         if (blkid_probe_has_value(pr, "SBBADCSUM")) {
 293                 if (!blkid_probe_lookup_value(pr, "TYPE", &prtype, NULL))
 294                         log_warning("incorrect %s checksum on %s",
 295                                     prtype, udev_device_get_devnode(dev));
 296                 else
 297                         log_warning("incorrect checksum on %s",
 298                                     udev_device_get_devnode(dev));
 299                 goto out;
 300         }
 301
 302         /* If we are a partition then our parent passed on the root
 303          * partition UUID to us */
 304         root_partition = udev_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID");
 305
 306         nvals = blkid_probe_numof_values(pr);
 307         for (i = 0; i < nvals; i++) {
 308                 if (blkid_probe_get_value(pr, i, &name, &data, NULL))
 309                         continue;
 310
 311                 print_property(dev, test, name, data);
 312
 313                 /* Is this a disk with GPT partition table? */
 314                 if (streq(name, "PTTYPE") && streq(data, "gpt"))
 315                         is_gpt = true;
 316
 317                 /* Is this a partition that matches the root partition
 318                  * property we inherited from our parent? */
 319                 if (root_partition && streq(name, "PART_ENTRY_UUID") && streq(data, root_partition))
 320                         udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT", "1");
 321         }
 322
 323         if (is_gpt)
 324                 find_gpt_root(dev, pr, test);
 325
 326         blkid_free_probe(pr);
 327 out:
 328         if (err < 0)
 329                 return EXIT_FAILURE;
 330
 331         return EXIT_SUCCESS;
 332 }
 333
 334 const struct udev_builtin udev_builtin_blkid = {
 335         .name = "blkid",
 336         .cmd = builtin_blkid,
 337         .help = "Filesystem and partition probing",
 338         .run_once = true,
 339 };