function domain_snapshot_revert($domain, $name) {
$name = $this->domain_snapshot_lookup_by_name($domain, $name);
$tmp = libvirt_domain_snapshot_revert($name);
return ($tmp) ? $tmp : $this->_set_last_error();
}
/**
* revert to a snapshot of a virtual machine on the virt host
*
* @todo TIDY UP to remove bugged code
*
* @global resource $host_conn libvirt connection
*
* @param string $vm_virt_id virt_id of the vm
* @param int $vm_snapshot_instance_to_revert_to snapshot instance
*
* @return bool on success
*/
function ace_kvm_vm_snapshot_revert($vm_virt_id, $vm_snapshot_instance_to_revert_to)
{
global $host_conn;
$vm_res = libvirt_domain_lookup_by_name($host_conn, $vm_virt_id);
ace_kvm_log_last_error();
$vm_snapshot_list = ace_kvm_vm_get_snapshot_list($vm_virt_id);
$num_vm_snapshots = count($vm_snapshot_list);
$max_snapshot_instance = $num_vm_snapshots - 1;
if ($num_vm_snapshots > 0 && $vm_snapshot_instance_to_revert_to >= 0 && $vm_snapshot_instance_to_revert_to <= $max_snapshot_instance) {
$vm_snapshot_name_to_revert_to = $vm_snapshot_list[$vm_snapshot_instance_to_revert_to];
$vm_snapshot_res_to_revert_to = libvirt_domain_snapshot_lookup_by_name($vm_res, $vm_snapshot_name_to_revert_to);
ace_kvm_log_last_error();
$revert_result = libvirt_domain_snapshot_revert($vm_snapshot_res_to_revert_to);
ace_kvm_log_last_error();
# resume, since the vm was 'paused' when the snapshot was taken
ace_kvm_vm_resume($vm_virt_id);
# then stop, since we only work with snapshots when vm is inactive
ace_kvm_vm_stop($vm_virt_id);
# if $vm_snapshot_instance < $num_snaps then delete snap[instance+1]-with children
# if (($num_vm_snapshots > 0) && ($vm_snapshot_instance < ($num_vm_snapshots - 1))) {
if ($vm_snapshot_instance_to_revert_to < $max_snapshot_instance) {
$all_delete_results = TRUE;
for ($i = $max_snapshot_instance; $i > $vm_snapshot_instance_to_revert_to; $i--) {
$vm_snapshot_name_to_delete = $vm_snapshot_list[$i];
$vm_snapshot_res_to_delete = libvirt_domain_snapshot_lookup_by_name($vm_res, $vm_snapshot_name_to_delete);
ace_kvm_log_last_error();
$delete_result = libvirt_domain_snapshot_delete($vm_snapshot_res_to_delete);
ace_kvm_log_last_error();
$all_delete_results = $all_delete_results && $delete_result;
}
# the following FAILS - it has to do with the children flag
//$result = libvirt_domain_snapshot_delete($vm_snapshot_res_to_delete,VIR_SNAPSHOT_DELETE_CHILDREN);
#$result = libvirt_domain_snapshot_delete($vm_snapshot_res_to_delete);
//ace_kvm_log_error();
} else {
$all_delete_results = TRUE;
}
} else {
$revert_result = FALSE;
}
return $revert_result && $all_delete_results;
}
