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Bug#690246: debian-installer: initial install reboot failure to find lvm devices when hostname has a - in it

On Thu, Oct 11, 2012 at 10:39:40AM -0400, Eli wrote:
> Package: debian-installer
> Version: 6.0.1a
> Severity: important
> Tags: d-i
> Standard debian 6 install, hostname has a dash in it, ie this-name. The lvm volume group then uses this-name
> for the volume group name. Install goes fine, but on reboot it dumps into initram shell saying it can't
> find root /dev/mapper/this-name-root. Not sure where the 2nd dash came from. lvm lvscan shows the volumes
> as inactive. lvchange -a y this-name/root activates the volume and creates /dev/mapper/this--name-root.
> System still won't boot 'cause it's confused about the mapper device name.
> -- System Information:
> Debian Release: 6.0.6
>   APT prefers stable
>   APT policy: (800, 'stable'), (500, 'stable-updates')
> Architecture: amd64 (x86_64)
> Kernel: Linux 3.2.0-0.bpo.3-amd64 (SMP w/16 CPU cores)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
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The method lvm uses for naming is:

Use volumegroupname-volumename

if the names have dashes in them, double up the dashes so that the only
place with a single dash is the one seperating the volumegroupname from
the volumename.

I think they do this to make sure hey stay unique.

After all if you had a volume group named 'a-b' with a volume named 'c'
and a nother volume group named 'a' with a volume named 'b-c' you would
end up with:

a-b-c for both of them if you didn't do the doubling thing.  Instead you get get:

a--b-c (VG a-b with LV c)
a-b--c (VG A with LV b-c)

So the installer must double the dash in any volumegroup name or
volumename when generating the name in /dev/mapper to expect.

Len Sorensen

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