[Libguestfs] [PATCH 7/8] inspection: Handle MD devices in fstab

[Matthew Booth]

On 11/24/2011 12:13 PM, Richard W.M. Jones wrote:
> On Wed, Nov 23, 2011 at 02:00:56PM +0000, Matthew Booth wrote:
>> This patch fixes inspection when fstab contains devices md devices
>
> s/devices md devices/md devices/
>
>> +/* Hash structure for path(mdadm)->path(appliance) lookup */
>
> There's trailing whitespace on this line, and one more line further
> on.  git am spotted this.

Grr.

>> +  if (!map_md_devices (g,&md_map)) return -1;
>
> The convention in almost all other code is to return>= 0 on success
> and -1 on error, not booleans.  I think this should be changed for
> consistency.

Meh, ok.

> How does this code act if /etc/mdadm.conf is bogus, but the guest
> doesn't have any MD devices (or doesn't have any in /etc/fstab at any
> rate)?  I think we should be able to deal with this by not giving an
> error.  It indeed appears to be the case that map_md_devices doesn't
> call error(), but wasn't clear if this was intentional so we can deal
> silently with a bogus mdadm.conf, or was accidental.

If mdadm.conf is bogus or doesn't contain any arrays, the augeas match 
will simply return an empty list. It requires no special error handling. 
I might just add a warning if we find md devices in the appliance but 
not in the guest, though.

Incidentally, this still requires the mdadm_conf, which is in upstream 
augeas but not yet in a release. I'm going to add the lens to libguestfs 
until it's released.

Patch to follow.

Matt
-- 
Matthew Booth, RHCA, RHCSS
Red Hat Engineering, Virtualisation Team

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