Re: [gentoo-user] [SOLVED] Running cryptsetup under mdev

["J. Roeleveld" <joost@antarean.org>]

On 7 May 2014 20:11:10 CEST, Walter Dnes <waltdnes@waltdnes.org> wrote:
>On Wed, May 07, 2014 at 08:11:02AM +0200, J. Roeleveld wrote
>> On Tuesday, May 06, 2014 05:34:52 PM Walter Dnes wrote:
>> > 
>> >   Unfortunately, mdev != udev.  People running RAID have problems
>too.
>> 
>> I know it isn't. I just find it strange that LVM can't work without
>> udev when I see options which configure the LVM-tools to either
>> double-check udevs actions or even completely bypass udev:
>
> Thanks for the pointer.  After turning off the udev-related options in
>lvm.conf, I'm getting /dev/mapper device nodes as expected.

That is good. Now if only mdadm can be confirmed to work with mdev. I could try it on one of my machines. 

>  I still
>can't get cryptsetup to work with LUKS, but it works fine *WITHOUT*
>LUKS
>as per instructions at
>http://sleepyhead.de/howto/?href=cryptpart#woluks
>In my case, the initial setup was...
>
>cryptsetup -y create usbkey1 /dev/sdb1
>mkfs.ext2 /dev/mapper/usbkey1
>mount -t ext2 /dev/mapper/usbkey1 /mnt/usbkey1
>umount /mnt/usbkey1
>cryptsetup remove usbkey1
>
>...and subsequent sessions...
>
>cryptsetup -y create usbkey1 /dev/sdb1
>mount -t ext2 /dev/mapper/usbkey1 /mnt/usbkey1
>...do whatever...
>umount /mnt/usbkey1
>cryptsetup remove usbkey1
>
>  The setup and teardown commands have to be done as root, but I've
>chowned /mnt/usbkey1 to waltdnes:users and confirmed that I can create
>and delete files and directories as a regular user.

The create and remove commands with LUKS also require root. They use a session manager in desktop environments to allow users to do it. Sudo with a secure wrapper script might be sufficient for you?

I was wondering. What is the actual reason why cryptsetup has a LUKS and non-LUKS set of options?

--
Joost


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