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 <sys/stat.h>
  29 #include <blkid/blkid.h>
  30
  31 #include "udev.h"
  32
  33 static void print_property(const char *name, const char *value)
  34 {
  35         char enc[265], safe[256];
  36         size_t namelen = strlen(name);
  37
  38         enc[0] = '\0';
  39         safe[0] = '\0';
  40
  41         if (!strcmp(name, "TYPE") || !strcmp(name, "VERSION")) {
  42                 blkid_encode_string(value, enc, sizeof(enc));
  43                 printf("ID_FS_%s=%s\n", name, enc);
  44
  45         } else if (!strcmp(name, "UUID") ||
  46                  !strcmp(name, "LABEL") ||
  47                  !strcmp(name, "UUID_SUB")) {
  48
  49                 blkid_safe_string(value, safe, sizeof(safe));
  50                 printf("ID_FS_%s=%s\n", name, safe);
  51
  52                 blkid_encode_string(value, enc, sizeof(enc));
  53                 printf("ID_FS_%s_ENC=%s\n", name, enc);
  54
  55         } else if (!strcmp(name, "PTTYPE")) {
  56                 printf("ID_PART_TABLE_TYPE=%s\n", value);
  57
  58         } else if (!strcmp(name, "PART_ENTRY_NAME") ||
  59                   !strcmp(name, "PART_ENTRY_TYPE")) {
  60
  61                 blkid_encode_string(value, enc, sizeof(enc));
  62                 printf("ID_%s=%s\n", name, enc);
  63
  64         } else if (!strncmp(name, "PART_ENTRY_", 11))
  65                 printf("ID_%s=%s\n", name, value);
  66
  67         else if (namelen >= 15 && (
  68                    !strcmp(name + (namelen - 12), "_SECTOR_SIZE") ||
  69                    !strcmp(name + (namelen - 8), "_IO_SIZE") ||
  70                    !strcmp(name, "ALIGNMENT_OFFSET")))
  71                         printf("ID_IOLIMIT_%s=%s\n", name, value);
  72         else
  73                 printf("ID_FS_%s=%s\n", name, value);
  74 }
  75
  76 static int probe_superblocks(blkid_probe pr)
  77 {
  78         struct stat st;
  79         int rc;
  80
  81         if (fstat(blkid_probe_get_fd(pr), &st))
  82                 return -1;
  83
  84         blkid_probe_enable_partitions(pr, 1);
  85
  86         if (!S_ISCHR(st.st_mode) && blkid_probe_get_size(pr) <= 1024 * 1440 &&
  87             blkid_probe_is_wholedisk(pr)) {
  88                 /*
  89                  * check if the small disk is partitioned, if yes then
  90                  * don't probe for filesystems.
  91                  */
  92                 blkid_probe_enable_superblocks(pr, 0);
  93
  94                 rc = blkid_do_fullprobe(pr);
  95                 if (rc < 0)
  96                         return rc;      /* -1 = error, 1 = nothing, 0 = succes */
  97
  98                 if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
  99                         return 0;       /* partition table detected */
 100         }
 101
 102         blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
 103         blkid_probe_enable_superblocks(pr, 1);
 104
 105         return blkid_do_safeprobe(pr);
 106 }
 107
 108 static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test)
 109 {
 110         char *device = "/dev/sda3";
 111         int64_t offset = 0;
 112         //int noraid = 0;
 113         int fd = -1;
 114         blkid_probe pr;
 115         const char *data;
 116         const char *name;
 117         int nvals;
 118         int i;
 119         size_t len;
 120         int err = 0;
 121
 122         //FIXME: read offset, read noraid
 123
 124         pr = blkid_new_probe();
 125         if (!pr) {
 126                 err = -ENOMEM;
 127                 return EXIT_FAILURE;
 128         }
 129
 130         blkid_probe_set_superblocks_flags(pr,
 131                 BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
 132                 BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
 133                 BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION);
 134
 135         fd = open(device, O_RDONLY|O_CLOEXEC);
 136         if (fd < 0) {
 137                 fprintf(stderr, "error: %s: %m\n", device);
 138                 goto out;
 139         }
 140
 141         err = blkid_probe_set_device(pr, fd, offset, 0);
 142         if (err < 0)
 143                 goto out;
 144
 145         err = probe_superblocks(pr);
 146         if (err < 0)
 147                 goto out;
 148
 149         nvals = blkid_probe_numof_values(pr);
 150         for (i = 0; i < nvals; i++) {
 151                 if (blkid_probe_get_value(pr, i, &name, &data, &len))
 152                         continue;
 153                 len = strnlen((char *) data, len);
 154                 print_property(name, (char *) data);
 155         }
 156
 157         blkid_free_probe(pr);
 158 out:
 159         if (fd > 0)
 160                 close(fd);
 161         if (err < 0)
 162                 return EXIT_FAILURE;
 163         return EXIT_SUCCESS;
 164 }
 165
 166 const struct udev_builtin udev_builtin_blkid = {
 167         .name = "blkid",
 168         .cmd = builtin_blkid,
 169         .help = "filesystem and partition probing",
 170         .run_once = true,
 171 };