[linux-lvm] Changing owner of lv device with udev

[linux-lvm] Changing owner of lv device with udev

[Nikolaus Rath]

Hello,

I'm having some trouble changing the owner of a logical device. I added
the following udev rule to both my initramfs and the real root:

SUBSYSTEM=="block",
ENV{DM_UUID}=="LVM-yYuoI8k05GWxZnz9BeEIwPUGGeojzF3dZZmXTYRqC051Tllj76OHdDlzYhKZUu7u",
OWNER="1000"

If I disable and re-enable this logical volume with lvchange, it gets
created with the correct owner.

However, when I boot the computer, the device always ends up being owned
by root:disk instead.

On the other hand, if I look at the permissions right before initramfs
executes the real init, the permissions are actually correct.

So, at some point between execution of the real init and completed
startup, something overwrites the owner of by device, but both before
and afterward the rule gets applied correctly.

I first blamed this on udev
(http://article.gmane.org/gmane.comp.sysutils.systemd.devel/7605), but I
was told that the problem might be with the special way that LVM uses
udev rules.

Does anyone have an idea what's happening here? How can I get this to work?

Thanks,
-Nikolaus

Re: [linux-lvm] Changing owner of lv device with udev

[Alasdair G Kergon]

On Wed, Dec 19, 2012 at 02:41:54PM -0800, Nikolaus Rath wrote:
> I'm having some trouble changing the owner of a logical device. I added
> the following udev rule to both my initramfs and the real root:

Tell people which distribution you're using and which version, and which
udev rule file you're editing.

Alasdair

Re: [linux-lvm] Changing owner of lv device with udev

[Nikolaus Rath]

On 12/20/2012 02:14 AM, Alasdair G Kergon wrote:
> On Wed, Dec 19, 2012 at 02:41:54PM -0800, Nikolaus Rath wrote:
>> I'm having some trouble changing the owner of a logical device. I added
>> the following udev rule to both my initramfs and the real root:
> Tell people which distribution you're using and which version, and which
> udev rule file you're editing.
I'm using Debian wheezy and added the rule to
/etc/udev/rules.d/99-udev-custom.rules.
I made sure this is copied into the initrd by adding a hook in
/etc/initramfs/hooks/.

Sorry for the omission. I thought it wouldn't matter because the rule
seemed to be parsed and used by udev perfectly both in the initrd and
after system boot.


Best,
Niko

Re: [linux-lvm] Changing owner of lv device with udev

[Nikolaus Rath]

Nikolaus Rath <Nikolaus@rath.org> writes:
> On 12/20/2012 02:14 AM, Alasdair G Kergon wrote:
>> On Wed, Dec 19, 2012 at 02:41:54PM -0800, Nikolaus Rath wrote:
>>> I'm having some trouble changing the owner of a logical device. I added
>>> the following udev rule to both my initramfs and the real root:
>> Tell people which distribution you're using and which version, and which
>> udev rule file you're editing.
> I'm using Debian wheezy and added the rule to
> /etc/udev/rules.d/99-udev-custom.rules.
> I made sure this is copied into the initrd by adding a hook in
> /etc/initramfs/hooks/.
>
> Sorry for the omission. I thought it wouldn't matter because the rule
> seemed to be parsed and used by udev perfectly both in the initrd and
> after system boot.


No one any idea?


Best,

   -Nikolaus

-- 
 »Time flies like an arrow, fruit flies like a Banana.«

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