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systemd/extras/volume_id/README

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[PATCH] udev_volume_id update 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.
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udev_volume_id - partition, filesystem, disklabel reader
This program is normally called from a udev rule, to provide udev with the
name, uuid or the filesystem type of a partition to name a device node.
[PATCH] udev_volume_id: remove temporary node creation and parent handling udev can create the temporary node for us now. (On bootup we don't know where a writable filesystem is mounted). Also the parent handling is not needed anymore, cause udev is able to pass us the node name of the parent device.
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udev_volume_id opens the blockdevice node specified at the commandline.
The following commandline switches are supported to specify what udev_volume_id
[PATCH] udev_volume_id update 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.
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should print to stdout:
no option prints all values
-h prints help text
-l prints the label of the partition
-u prints the uuid of the partition
udev_volume_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.
The following rule will create a symlink named with the label string:
[PATCH] udev_volume_id: remove temporary node creation and parent handling udev can create the temporary node for us now. (On bootup we don't know where a writable filesystem is mounted). Also the parent handling is not needed anymore, cause udev is able to pass us the node name of the parent device.
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KERNEL="[hs]d*", PROGRAM="/sbin/udev_volume_id -l %N", SYMLINK="%c"
[PATCH] udev_volume_id update 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.
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If no label is found udev_volume_id exits with nonzero and the rule will be
ignored.
To give it a try, you may call it on the commandline:
[PATCH] udev_volume_id: remove temporary node creation and parent handling udev can create the temporary node for us now. (On bootup we don't know where a writable filesystem is mounted). Also the parent handling is not needed anymore, cause udev is able to pass us the node name of the parent device.
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[root@pim udev.kay]# extras/volume_id/udev_volume_id /dev/hda3
[PATCH] udev_volume_id update 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.
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T:ext3
L:Music Store
N:Music_Store
U:d2da42b5-bbd9-44eb-a72c-cc4542fcb71e
[PATCH] udev_volume_id: remove temporary node creation and parent handling udev can create the temporary node for us now. (On bootup we don't know where a writable filesystem is mounted). Also the parent handling is not needed anymore, cause udev is able to pass us the node name of the parent device.
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[root@pim udev.kay]# extras/volume_id/udev_volume_id -l /dev/hda3
[PATCH] udev_volume_id update 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.
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Music_Store
[PATCH] udev_volume_id: remove temporary node creation and parent handling udev can create the temporary node for us now. (On bootup we don't know where a writable filesystem is mounted). Also the parent handling is not needed anymore, cause udev is able to pass us the node name of the parent device.
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[root@pim udev.kay]# extras/volume_id/udev_volume_id -t /dev/hda3
[PATCH] udev_volume_id update 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.
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swap
Please send any comment/questions/concerns to me or:
linux-hotplug-devel@lists.sourceforge.net
Kay Sievers <kay.sievers@vrfy.org>
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