[libvirt] [PATCH] Add APIs for obtaining the unique ID of LVM & SCSI volumes

[Daniel P. Berrange]

On Mon, Aug 06, 2012 at 02:16:39PM -0600, Eric Blake wrote:
> On 08/02/2012 07:09 AM, Daniel P. Berrange wrote:
> > From: "Daniel P. Berrange" <berrange at redhat.com>
> > 
> > Both LVM volumes and SCSI LUNs have a globally unique
> > identifier associated with them. It is useful to be able
> > to query this identifier to then perform disk locking,
> > rather than try to figure out a stable pathname.
> > ---
> >  src/util/storage_file.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  src/util/storage_file.h |  3 ++
> >  2 files changed, 96 insertions(+)
> > 
> > +#ifdef HAVE_UDEV
> > +const char *virStorageFileGetSCSIKey(const char *path)
> > +{
> > +    char *key = NULL;
> > +    virCommandPtr cmd = virCommandNewArgList(
> > +        "/lib/udev/scsi_id",
> 
> Are we okay hard-coding the name of this utility, or should it be
> learned during configure?  At any rate, changing that can be an
> incremental improvement later.

AFAIK, it is always in this location on all distros, so I think we're
safe for now. NB, this is the same as some code already present in
the storage driver source - I'll be sending a followup patch to
make the storage driver just call this method now.

> ACK.

Daniel
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