Restore single backed-up volume on a live instance attaches the volume as a Raw image making it unreadable (apache#10844)

Author: abh1sar

plugins/backup/nas/src/main/java/org/apache/cloudstack/backup/NASBackupProvider.java

@@ -26,6 +26,7 @@
 import com.cloud.host.dao.HostDao;
 import com.cloud.hypervisor.Hypervisor;
 import com.cloud.storage.ScopeType;
+import com.cloud.storage.Storage;
 import com.cloud.storage.StoragePoolHostVO;
 import com.cloud.storage.Volume;
 import com.cloud.storage.VolumeVO;
@@ -279,6 +280,7 @@ public Pair<Boolean, String> restoreBackedUpVolume(Backup backup, String volumeU
         restoredVolume.setPoolId(dataStore.getPoolId());
         restoredVolume.setPath(restoredVolume.getUuid());
         restoredVolume.setState(Volume.State.Copying);
+        restoredVolume.setFormat(Storage.ImageFormat.QCOW2);
         restoredVolume.setSize(backedUpVolumeSize);
         restoredVolume.setDiskOfferingId(volume.getDiskOfferingId());
 

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtRestoreBackupCommandWrapper.java

@@ -45,7 +45,7 @@ public class LibvirtRestoreBackupCommandWrapper extends CommandWrapper<RestoreBa
     private static final String MOUNT_COMMAND = "sudo mount -t %s %s %s";
     private static final String UMOUNT_COMMAND = "sudo umount %s";
     private static final String FILE_PATH_PLACEHOLDER = "%s/%s";
-    private static final String ATTACH_DISK_COMMAND = " virsh attach-disk %s %s %s --cache none";
+    private static final String ATTACH_DISK_COMMAND = " virsh attach-disk %s %s %s --driver qemu --subdriver qcow2 --cache none";
     private static final String CURRRENT_DEVICE = "virsh domblklist --domain %s | tail -n 3 | head -n 1 | awk '{print $1}'";
     private static final String RSYNC_COMMAND = "rsync -az %s %s";