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cde5a756ce
Here is a update to extras/volume_id/* o The device is now specified by the DEVPATH in the environment, it's no longer needed to pass the major/minor to the callout. o leading spaces and slashes are now removed from the returned string and spaces are replaced by underscore, to not to confuse udev. o Arnd Bergmann <arnd@arndb.de> provided the code to recognize s390 dasd disk labels. The -d switch tries to read the main block device instead of the partition.
50 lines
1.7 KiB
Plaintext
50 lines
1.7 KiB
Plaintext
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udev_volume_id - partition, filesystem, disklabel reader
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This program is normally called from a udev rule, to provide udev with the
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name, uuid or the filesystem type of a partition to name a device node.
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udev_volume_id opens the blockdevice specified by the environment variable
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DEVPATH and searches for a filesystem superblock to read the label. The
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following commandline switches are supported to specify what udev_volume_id
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should print to stdout:
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no option prints all values
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-h prints help text
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-l prints the label of the partition
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-u prints the uuid of the partition
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-d read disk instead of partition
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If -d is specified udev_volume_id tries to read the label from the main
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block device where the partition belongs to. For now this is only useful
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for s390 dasd labels.
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udev_volume_id will only return successful if the string asked for, is not
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empty. All trailing whitespace will be removed, spaces replaced by underscore
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and slashes ignored.
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The following rule will create a symlink named with the label string:
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KERNEL="[hs]d*", PROGRAM="/sbin/udev_volume_id -l", SYMLINK="%c"
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If no label is found udev_volume_id exits with nonzero and the rule will be
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ignored.
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To give it a try, you may call it on the commandline:
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[root@pim udev.kay]# DEVPATH=/block/hda/hda3 extras/volume_id/udev_volume_id
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T:ext3
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L:Music Store
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N:Music_Store
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U:d2da42b5-bbd9-44eb-a72c-cc4542fcb71e
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[root@pim udev.kay]# DEVPATH=/block/hda/hda3 extras/volume_id/udev_volume_id -l
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Music_Store
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[root@pim udev.kay]# DEVPATH=/block/hda/hda1 extras/volume_id/udev_volume_id -t
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swap
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Please send any comment/questions/concerns to me or:
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linux-hotplug-devel@lists.sourceforge.net
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Kay Sievers <kay.sievers@vrfy.org>
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