udev/udev-builtin-blkid.c

   1 /*
   2  * probe disks for filesystems and partitions
   3  *
   4  * Copyright (C) 2011 Kay Sievers <kay.sievers@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 (!strcmp(name, "TYPE")) {
  41                 udev_builtin_add_property(dev, test, "ID_FS_TYPE", value);
  42
  43         } else if (!strcmp(name, "VERSION")) {
  44                 udev_builtin_add_property(dev, test, "ID_FS_VERSION", value);
  45
  46         } else if (!strcmp(name, "UUID")) {
  47                 blkid_safe_string(value, s, sizeof(s));
  48                 udev_builtin_add_property(dev, test, "ID_FS_UUID", s);
  49                 blkid_encode_string(value, s, sizeof(s));
  50                 udev_builtin_add_property(dev, test, "ID_FS_UUID_ENC", s);
  51
  52         } else if (!strcmp(name, "UUID_SUB")) {
  53                 blkid_safe_string(value, s, sizeof(s));
  54                 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB", s);
  55                 blkid_encode_string(value, s, sizeof(s));
  56                 udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB_ENC", s);
  57
  58         } else if (!strcmp(name, "LABEL")) {
  59                 blkid_safe_string(value, s, sizeof(s));
  60                 udev_builtin_add_property(dev, test, "ID_FS_LABEL", s);
  61                 blkid_encode_string(value, s, sizeof(s));
  62                 udev_builtin_add_property(dev, test, "ID_FS_LABEL_ENC", s);
  63
  64         } else if (!strcmp(name, "PTTYPE")) {
  65                 udev_builtin_add_property(dev, test, "ID_PART_TABLE_TYPE", value);
  66
  67         } else if (!strcmp(name, "PART_ENTRY_NAME")) {
  68                 blkid_encode_string(value, s, sizeof(s));
  69                 udev_builtin_add_property(dev, test, "PART_ENTRY_NAME", s);
  70
  71         } else if (!strcmp(name, "PART_ENTRY_TYPE")) {
  72                 blkid_encode_string(value, s, sizeof(s));
  73                 udev_builtin_add_property(dev, test, "PART_ENTRY_TYPE", s);
  74
  75         } else if (!strncmp(name, "PART_ENTRY_", 11)) {
  76                 util_strscpyl(s, sizeof(s), "ID_", name, NULL);
  77                 udev_builtin_add_property(dev, test, name, value);
  78         }
  79 }
  80
  81 static int probe_superblocks(blkid_probe pr)
  82 {
  83         struct stat st;
  84         int rc;
  85
  86         if (fstat(blkid_probe_get_fd(pr), &st))
  87                 return -1;
  88
  89         blkid_probe_enable_partitions(pr, 1);
  90
  91         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
  92             blkid_probe_is_wholedisk(pr)) {
  93                 /*
  94                  * check if the small disk is partitioned, if yes then
  95                  * don't probe for filesystems.
  96                  */
  97                 blkid_probe_enable_superblocks(pr, 0);
  98
  99                 rc = blkid_do_fullprobe(pr);
 100                 if (rc < 0)
 101                         return rc;      /* -1 = error, 1 = nothing, 0 = succes */
 102
 103                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
 104                         return 0;       /* partition table detected */
 105         }
 106
 107         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 108         blkid_probe_enable_superblocks(pr, 1);
 109
 110         return blkid_do_safeprobe(pr);
 111 }
 112
 113 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test)
 114 {
 115         struct udev *udev = udev_device_get_udev(dev);
 116         int64_t offset = 0;
 117         bool noraid = false;
 118         int fd = -1;
 119         blkid_probe pr;
 120         const char *data;
 121         const char *name;
 122         int nvals;
 123         int i;
 124         size_t len;
 125         int err = 0;
 126
 127         static const struct option options[] = {
 128                 { "offset", optional_argument, NULL, 'o' },
 129                 { "noraid", no_argument, NULL, 'R' },
 130                 {}
 131         };
 132
 133         for (;;) {
 134                 int option;
 135
 136                 option = getopt_long(argc, argv, "oR", options, NULL);
 137                 if (option == -1)
 138                         break;
 139
 140                 switch (option) {
 141                 case 'o':
 142                         offset = strtoull(optarg, NULL, 0);
 143                         break;
 144                 case 'R':
 145                         noraid = true;
 146                         break;
 147                 }
 148         }
 149
 150         pr = blkid_new_probe();
 151         if (!pr) {
 152                 err = -ENOMEM;
 153                 return EXIT_FAILURE;
 154         }
 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         info(udev, "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 };