vol_id - probe filesystem and read label and uuid
-This program is normally called from a udev rule, to provide udev with the
-filesystem type of a volume and the label and uuid to name a device node.
-vol_id opens the blockdevice node specified at the commandline. The following
-commandline switches are supported to specify what vol_id should print:
+vol_id will only return with a non-zero exit code if the string asked for,
+is not empty. All trailing whitespace will be removed, spaces replaced by
+underscore and slashes ignored.
+Unmangled values are available in the --export mode as hex-encoded strings
+in *_ENC= keys.
- --export prints all values
- -h prints help text
- -l prints the label of the volume
- -u prints the uuid of the volume
+ $ extras/volume_id/vol_id --export /dev/sda6
+ ID_FS_USAGE=filesystem
+ ID_FS_TYPE=ext3
+ ID_FS_VERSION=1.0
+ ID_FS_UUID=3e999973-00c9-4917-9442-b7633bd95b9e
+ ID_FS_UUID_ENC=3e999973-00c9-4917-9442-b7633bd95b9e
+ ID_FS_LABEL=devel
+ ID_FS_LABEL_ENC=devel
-vol_id will only return successful if the string asked for, is not
-empty. All trailing whitespace will be removed, spaces replaced by underscore
-and slashes ignored.
+ $ extras/volume_id/vol_id --label /dev/sda6
+ devel
-fstype probe label uuid fsversion
-----------------------------------------------------
+ $ extras/volume_id/vol_id --type /dev/sda6
+ ext3
+
+
+fstype probe label uuid version
+--------------------------------------------------
linux swap * * * *
+btrfs * * * -
ext * * * *
reiserfs jr/3.5/3.6/4 * * * *
fat (12, 16, 32) * * * *
cramfs * * - -
sysv * * - *
luks * - * -
-hpfs * - - -
+hpfs * * - -
romfs * * - -
squashfs * - - -
minix * - - *
ocfs (1, 2) * * * *
vxfs * - - *
+nss (netware) * - * *
+gfs, gfs2 * * * -
+oracleasm * * - -
Raid members are detected to prevent the probing for a filesystem
-----------------------------------------------------------------
-linux raid * - * *
+linux raid (md) * * * *
LVM 1 * - - -
LVM 2 * - - *
+ddf * - * *
highpoint * - - -
isw_raid * - - -
lsi_raid * - - -
promise_raid * - - -
silicon_raid * - - -
via_raid * - - -
-
-
-If no label is found vol_id exits with nonzero and the rule will be
-ignored.
-
-To give it a try, you may call it on the commandline:
- $ extras/volume_id/vol_id --export /dev/sda6
- ID_FS_USAGE=filesystem
- ID_FS_TYPE=ext3
- ID_FS_VERSION=1.0
- ID_FS_UUID=3e999973-00c9-4917-9442-b7633bd95b9e
- ID_FS_LABEL=devel
- ID_FS_LABEL_SAFE=devel
-
- $ extras/volume_id/vol_id -l /dev/sda6
- devel
-
- $ extras/volume_id/vol_id -t /dev/sda6
- ext3
-
-
-Any comment/questions/concerns to me:
- Kay Sievers <kay.sievers@vrfy.org>
+jmicron * - - -
+adaptec * - - -