Am Freitag, 14. September 2007 schrieb ext Harald Dunkel:
> I am not sure about Dirk's suggestion, but AFAIU it wouldn't
> work for me. The point is that I would like to use the label
> to run cryptsetup. If the udev rule to make a label available
> in /dev/usb relies upon /dev/mapper, then this doesn't work.
No it does not, see below.
> The entry in /dev/mapper doesn't exist when I need it.
The entry in /dev/mapper does only exist _after_ cryptsetup has been run
successfully.
A udev rule creates different or additional names of _your_ choice for the
device and its partitions, based on information found in the hardware
itself, like manufacturer, serial no., etc. This way you make sure the name
is the same whenever you plug in the device. A rule can also run a script,
which could then create the mappings for you if the stick contains an
encrypted partition.
If the rule works in one machine, you can copy it to other machines and it
will create the same device names there.
I have the following udev rules defined for my usb devices:
# USB Harddisk
BUS=="scsi", KERNEL=="sd*", ATTRS{model}=="-210 ",
ATTRS{vendor}=="IBM-DJSA", SYMLINK="usb/disk%n"
# USB Stick 32MB
BUS=="scsi", KERNEL=="sd*", ATTRS{model}=="HardDrive ",
ATTRS{rev}=="1.11", ATTRS{vendor}=="32MB ", SYMLINK="usb/smallstick%n"
# USB Stick SanDisk 1GB
SUBSYSTEMS=="usb", KERNEL=="sd*", ATTRS{product}=="Cruzer Micro",
ATTRS{serial}=="2005173991167CA2BF93", SYMLINK="usb/stick%n"
For a more detailed explanation read:
http://www.reactivated.net/writing_udev_rules.html
Bye...
Dirk
--
Dirk Heinrichs | Tel: +49 (0)162 234 3408
Configuration Manager | Fax: +49 (0)211 47068 111
Capgemini Deutschland | Mail: dirk.heinrichs@xxxxxxxxxxxxx
Wanheimerstraße 68 | Web: http://www.capgemini.com
D-40468 Düsseldorf | ICQ#: 110037733
GPG Public Key C2E467BB | Keyserver: www.keyserver.net
Attachment:
signature.asc
Description: This is a digitally signed message part.
