Re: udev lvm permisions

[Michal Soltys <soltys@ziu.info>]

Geert Geurts wrote:
> Hello,
> the permissions to the HomeVolume are not set correctly by Suse, so the
> volume cannot be decrypted and cannot be mounted.
> How can I create a udev rule that applies only to one LVM volume?
> 

You could match by NAME, for example something similar to:

KERNEL="dm*", ACTION="add|change", SUBSYSTEM="block", NAME="<name 
assigned earlier>", OWNER="<something>", GROUP="<something>", 
MODE=<something>

But for that to work, you need some earlier udev rule setting actual 
name - stock udev rules have no device-mapper rules. So it's up to your 
distro's rules or your own. Alternatively, you could just match by uuid:

ACTION!="add|change", GOTO="dm_end"
KERNEL!="dm*", GOTO="dm_end"

PROGRAM="/sbin/dmsetup info -c --noheadings -o uuid -j%M -m%m", 
ENV{DM_UUID}="%c"

ENV{DM_UUID}="<uuid of needed lvm volume>", OWNER=<something>, 
GROUP=<something>, MODE=<something>

LABEL="dm_end"

Then put it into some late-parsed udev rule. Note that uuid reported by 
dmsetup, will look like LVM-<vg uuid><lv uuid> without any dashes.