[libvirt] lvm backed storage

Serge E. Hallyn serge.hallyn at canonical.com
Mon Sep 12 16:57:18 UTC 2011

Quoting Daniel P. Berrange (berrange at redhat.com):
> 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.

I was trying that in the backend_logical.c file, but when command_names=1
that code never even gets called, so there is some other place that is
calling a pvscan or somesuch that I haven't found yet.

Will take another look though.


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