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 <stdarg.h>
  24 #include <unistd.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <fcntl.h>
  28 #include <getopt.h>
  29 #include <sys/stat.h>
  30 #include <blkid/blkid.h>
  31
  32 #include "udev.h"
  33
  34 static void print_property(struct udev_device *dev, bool test, const char *name, const char *value)
  35 {
  36         char s[265];
  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 probe_superblocks(blkid_probe pr)
 104 {
 105         struct stat st;
 106         int rc;
 107
 108         if (fstat(blkid_probe_get_fd(pr), &st))
 109                 return -1;
 110
 111         blkid_probe_enable_partitions(pr, 1);
 112
 113         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
 114             blkid_probe_is_wholedisk(pr)) {
 115                 /*
 116                  * check if the small disk is partitioned, if yes then
 117                  * don't probe for filesystems.
 118                  */
 119                 blkid_probe_enable_superblocks(pr, 0);
 120
 121                 rc = blkid_do_fullprobe(pr);
 122                 if (rc < 0)
 123                         return rc;        /* -1 = error, 1 = nothing, 0 = succes */
 124
 125                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 126                         return 0;        /* partition table detected */
 127         }
 128
 129         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 130         blkid_probe_enable_superblocks(pr, 1);
 131
 132         return blkid_do_safeprobe(pr);
 133 }
 134
 135 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test)
 136 {
 137         int64_t offset = 0;
 138         bool noraid = false;
 139         int fd = -1;
 140         blkid_probe pr;
 141         const char *data;
 142         const char *name;
 143         int nvals;
 144         int i;
 145         size_t len;
 146         int err = 0;
 147
 148         static const struct option options[] = {
 149                 { "offset", optional_argument, NULL, 'o' },
 150                 { "noraid", no_argument, NULL, 'R' },
 151                 {}
 152         };
 153
 154         for (;;) {
 155                 int option;
 156
 157                 option = getopt_long(argc, argv, "oR", options, NULL);
 158                 if (option == -1)
 159                         break;
 160
 161                 switch (option) {
 162                 case 'o':
 163                         offset = strtoull(optarg, NULL, 0);
 164                         break;
 165                 case 'R':
 166                         noraid = true;
 167                         break;
 168                 }
 169         }
 170
 171         pr = blkid_new_probe();
 172         if (!pr)
 173                 return EXIT_FAILURE;
 174
 175         blkid_probe_set_superblocks_flags(pr,
 176                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 177                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 178                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 179
 180         if (noraid)
 181                 blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
 182
 183         fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC);
 184         if (fd < 0) {
 185                 fprintf(stderr, "error: %s: %m\n", udev_device_get_devnode(dev));
 186                 goto out;
 187         }
 188
 189         err = blkid_probe_set_device(pr, fd, offset, 0);
 190         if (err < 0)
 191                 goto out;
 192
 193         log_debug("probe %s %sraid offset=%llu\n",
 194                   udev_device_get_devnode(dev),
 195                   noraid ? "no" : "", (unsigned long long) offset);
 196
 197         err = probe_superblocks(pr);
 198         if (err < 0)
 199                 goto out;
 200
 201         nvals = blkid_probe_numof_values(pr);
 202         for (i = 0; i < nvals; i++) {
 203                 if (blkid_probe_get_value(pr, i, &name, &data, &len))
 204                         continue;
 205                 len = strnlen((char *) data, len);
 206                 print_property(dev, test, name, (char *) data);
 207         }
 208
 209         blkid_free_probe(pr);
 210 out:
 211         if (fd > 0)
 212                 close(fd);
 213         if (err < 0)
 214                 return EXIT_FAILURE;
 215         return EXIT_SUCCESS;
 216 }
 217
 218 const struct udev_builtin udev_builtin_blkid = {
 219         .name = "blkid",
 220         .cmd = builtin_blkid,
 221         .help = "filesystem and partition probing",
 222         .run_once = true,
 223 };