bug#20791: GuixSD: cryptsetup luksFormat hangs when udevd is running

[Ludovic Courtès]

Benz Schenk <address@hidden> skribis:

> Setting up luks encrypted partitions with cryptsetup doesn't work when udevd 
> is running.
>
> cryptsetup luksFormat got stuck waiting on some semaphore to turn to zero
>
> According to http://www.saout.de/pipermail/dm-crypt/2013-November/003619.html 
> this is a udev issue, so i killed udevd and after that it worked
>
> I assume it's some configuration issue with udev, but I don't really know 
> enough about this stuff to pinpoint where exactly the problem lies

Indeed, we were missing the udev rules for device-mapper.  Commit
e1ad6bf fixes that (tested in a VM as produced as by ‘guix system vm
gnu/system/install.scm’.)

If you have a working Guix installation, you can try rebuilding the
image by yourself from a checkout of Guix master, with something like:

  guix system disk-image --image-size=850MiB gnu/system/install.scm

Alternately, as a workaround, you could to the installation in two
steps:

  1. Install without encrypted devices.
  2. Boot the installed system and run ‘cryptsetup luksFormat’.
  3. Run ‘guix system reconfigure’ with the configuration that you want.

Thank you!

Ludo’.