[libvirt] lvm backed storage

Daniel P. Berrange berrange at redhat.com
Mon Sep 12 15:05:46 UTC 2011

On Thu, Sep 08, 2011 at 11:00:07AM -0500, Serge Hallyn wrote:
> Hi,
> When lvm.conf has 'command_names = 1', then all results are prefixed with
> the command name.  This confuses libvirt which does not ignore those.  I
> thought fixing that would be a simple case of detecting those conditions
> at virStorageBackendLogicalMakeVol() and friends, but I was wrong - those
> functions are not getting called at all when command_names=1.  I'll keep
> nosing around, but it seemed prudent to ping the list and ask what you
> think would be the cleanest way to handle this case?

Urgh, what a frickin' horrible feature to have in a config file, with
no command line override.

That said, it should be possible to fix via a regex tweak. There are
several places where we call virStorageBackendRunProgRegex in
storage_backend_logical.c. In all of those cases you need to tweak
the 'regexes' definition to add a bit of magic to optionally detect
and ignore the prefix.

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