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Re: [libvirt] [PATCHv3 03/43] snapshot: properly revert qemu to offline snapshots

On 08/24/2011 10:10 AM, Daniel P. Berrange wrote:
On Wed, Aug 24, 2011 at 09:22:20AM -0600, Eric Blake wrote:
+    const char *qemuimgarg[] = { NULL, "snapshot", "-a", NULL, NULL, NULL };

+    for (i = 0; i<  vm->def->ndisks; i++) {

+            qemuimgarg[4] = vm->def->disks[i]->src;
+            if (virRun(qemuimgarg, NULL)<  0)

I know that virRun is implemented in terms of virCommand, but should
be we aiming to convert virRun uses over to directly use virCommand ?

Here, virRun really is nicer, because it is the only interface that lets us modify _just_ qemuimgarg[4] without having to alter the earlier array elements. If we directly used virCommand, we'd have to start from scratch each time around, or add a new virCommand interface that would let us delete or otherwise modify arguments previously added. That, and this new code was merely copying after other functions that did qemu-img snapshot -c and qemu-img snapshot -d for multiple files.



Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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