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, "PART_ENTRY_NAME")) {
  71                 blkid_encode_string(value, s, sizeof(s));
  72                 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_NAME", s);
  73
  74         } else if (streq(name, "PART_ENTRY_TYPE")) {
  75                 blkid_encode_string(value, s, sizeof(s));
  76                 udev_builtin_add_property(dev, test, "ID_PART_ENTRY_TYPE", s);
  77
  78         } else if (startswith(name, "PART_ENTRY_")) {
  79                 util_strscpyl(s, sizeof(s), "ID_", name, NULL);
  80                 udev_builtin_add_property(dev, test, s, value);
  81         }
  82 }
  83
  84 static int probe_superblocks(blkid_probe pr)
  85 {
  86         struct stat st;
  87         int rc;
  88
  89         if (fstat(blkid_probe_get_fd(pr), &st))
  90                 return -1;
  91
  92         blkid_probe_enable_partitions(pr, 1);
  93
  94         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
  95             blkid_probe_is_wholedisk(pr)) {
  96                 /*
  97                  * check if the small disk is partitioned, if yes then
  98                  * don't probe for filesystems.
  99                  */
 100                 blkid_probe_enable_superblocks(pr, 0);
 101
 102                 rc = blkid_do_fullprobe(pr);
 103                 if (rc < 0)
 104                         return rc;        /* -1 = error, 1 = nothing, 0 = succes */
 105
 106                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 107                         return 0;        /* partition table detected */
 108         }
 109
 110         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 111         blkid_probe_enable_superblocks(pr, 1);
 112
 113         return blkid_do_safeprobe(pr);
 114 }
 115
 116 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test)
 117 {
 118         int64_t offset = 0;
 119         bool noraid = false;
 120         int fd = -1;
 121         blkid_probe pr;
 122         const char *data;
 123         const char *name;
 124         int nvals;
 125         int i;
 126         size_t len;
 127         int err = 0;
 128
 129         static const struct option options[] = {
 130                 { "offset", optional_argument, NULL, 'o' },
 131                 { "noraid", no_argument, NULL, 'R' },
 132                 {}
 133         };
 134
 135         for (;;) {
 136                 int option;
 137
 138                 option = getopt_long(argc, argv, "oR", options, NULL);
 139                 if (option == -1)
 140                         break;
 141
 142                 switch (option) {
 143                 case 'o':
 144                         offset = strtoull(optarg, NULL, 0);
 145                         break;
 146                 case 'R':
 147                         noraid = true;
 148                         break;
 149                 }
 150         }
 151
 152         pr = blkid_new_probe();
 153         if (!pr)
 154                 return EXIT_FAILURE;
 155
 156         blkid_probe_set_superblocks_flags(pr,
 157                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 158                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 159                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 160
 161         if (noraid)
 162                 blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
 163
 164         fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC);
 165         if (fd < 0) {
 166                 fprintf(stderr, "error: %s: %m\n", udev_device_get_devnode(dev));
 167                 goto out;
 168         }
 169
 170         err = blkid_probe_set_device(pr, fd, offset, 0);
 171         if (err < 0)
 172                 goto out;
 173
 174         log_debug("probe %s %sraid offset=%llu\n",
 175                   udev_device_get_devnode(dev),
 176                   noraid ? "no" : "", (unsigned long long) offset);
 177
 178         err = probe_superblocks(pr);
 179         if (err < 0)
 180                 goto out;
 181
 182         nvals = blkid_probe_numof_values(pr);
 183         for (i = 0; i < nvals; i++) {
 184                 if (blkid_probe_get_value(pr, i, &name, &data, &len))
 185                         continue;
 186                 len = strnlen((char *) data, len);
 187                 print_property(dev, test, name, (char *) data);
 188         }
 189
 190         blkid_free_probe(pr);
 191 out:
 192         if (fd > 0)
 193                 close(fd);
 194         if (err < 0)
 195                 return EXIT_FAILURE;
 196         return EXIT_SUCCESS;
 197 }
 198
 199 const struct udev_builtin udev_builtin_blkid = {
 200         .name = "blkid",
 201         .cmd = builtin_blkid,
 202         .help = "filesystem and partition probing",
 203         .run_once = true,
 204 };