extras/volume_id/README

   1 vol_id - volume, filesystem, disklabel reader
   2
   3 This program is normally called from a udev rule, to provide udev with the
   4 name, uuid or the filesystem type of a volume to name a device node.
   5 vol_id opens the blockdevice node specified at the commandline.
   6 The following commandline switches are supported to specify what vol_id
   7 should print:
   8
   9   --export prints all values
  10   -h       prints help text
  11   -l       prints the label of the volume
  12   -u       prints the uuid of the volume
  13
  14 vol_id will only return successful if the string asked for, is not
  15 empty. All trailing whitespace will be removed, spaces replaced by underscore
  16 and slashes ignored.
  17
  18 fstype                 probe  label  uuid  fsversion
  19 ----------------------------------------------------
  20 ext                    *      *      *     *
  21 reiserfs jr/3.5/3.6/4  *      *      *     *
  22 fat (12, 16, 32)       *      *      *     *
  23 ntfs                   *      *      *     *
  24 jfs                    *      *      *     -
  25 xfs                    *      *      *     -
  26 hfs (plus, wrapped)    *      *      *     -
  27 udf                    *      *      -     -
  28 iso9660                *      *      n/a   -
  29 ufs                    *      -      -     -
  30 linux swap             *      *      *     *
  31 LVM 1                  *      -      -     -
  32 LVM 2                  *      -      -     *
  33 linux raid             *      -      *     *
  34 cramfs                 *      *      -     -
  35 sysv                   *      *      -     *
  36 luks                   *      -      *     -
  37 hpfs                   *      -      -     -
  38 romfs                  *
  39 squashfs               *
  40 minix                  *
  41 highpoint              *
  42 isw_raid               *
  43 lsi_raid               *
  44 nvidia_raid            *
  45 promise_raid           *
  46 silicon_raid           *
  47 via_raid               *
  48
  49
  50 If no label is found vol_id exits with nonzero and the rule will be
  51 ignored.
  52
  53 To give it a try, you may call it on the commandline:
  54   $ extras/volume_id/vol_id --export /dev/sda6
  55   ID_FS_USAGE=filesystem
  56   ID_FS_TYPE=ext3
  57   ID_FS_VERSION=1.0
  58   ID_FS_UUID=3e999973-00c9-4917-9442-b7633bd95b9e
  59   ID_FS_LABEL=devel
  60   ID_FS_LABEL_SAFE=devel
  61
  62   $ extras/volume_id/vol_id -l /dev/sda6
  63   devel
  64
  65   $ extras/volume_id/vol_id -t /dev/sda6
  66   ext3
  67
  68
  69 Any comment/questions/concerns to me:
  70   Kay Sievers <kay.sievers@vrfy.org>