[Libvir] [PATCH]: Make the iscsi backend work with updated iscsiadm tools

[Daniel Veillard]

On Wed, Mar 26, 2008 at 06:16:39PM -0400, Chris Lalancette wrote:
> All,
>      Updated versions of the iscsi-initiator-utils changed the output structure
> from the "iscsiadm -m session -P 3" command, which is being used in
> storage_backend_iscsi.c to gather the scsi devices available in a pool and
> present them as volumes.  Consequently, when starting an iSCSI pool on a machine
> with a newer version of the iscsi tools, you can successfully define the pool,
> but will fail to find any LUNs on it.
> 
> The attached patch lessens our dependency on this command by groping around
> sysfs for the information, instead of parsing it from the iscsiadm command.  We
> still parse the command to get target, channel, id, and lun numbers, but then we
> cruise through sysfs looking for the corresponding /dev/sd? devices ourselves.
> This makes the libvirt iSCSI backend work for both older iscsiadm and newer
> iscsiadm.
> 
> After much wrangling with iscsiadm and friends, I came to the conclusion that
> this is the best we can do with the current state of the iscsi tools; from what
> I can tell, there is no (simple) way to get away from parsing the iscsiadm output.
> 
> This is a repost of a patch I had originally posted on 2/21; this patch
> incorporates Jim's comments at that time, and also adds better error checking
> and error strings.  Please review and commit as appropriate.

  okay, fine by me, applied and commited,

    thanks !

Daniel

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