Implemented disk selection in VM migrations

    def migrate(self, dest_uri, live=False):

        volumes = list(self.iter_disks())  # Store volumes for future cleanup

        migration_params = {}

        # Get the list of shared, non shared disks and shared pools:

        shared = set()

        shared_pools = set()

        nonshared = set()

        for volume in volumes:

            if volume.storage.is_shared:

                shared.add(volume.device)

                shared_pools.add(volume.storage.name)

            else:

                nonshared.add(volume.device)

        flags = (libvirt.VIR_MIGRATE_PEER2PEER

                 | libvirt.VIR_MIGRATE_PERSIST_DEST

                 | libvirt.VIR_MIGRATE_UNDEFINE_SOURCE)

        if live:

            flags |= (libvirt.VIR_MIGRATE_LIVE

                      | libvirt.VIR_MIGRATE_NON_SHARED_DISK

                      | libvirt.VIR_MIGRATE_AUTO_CONVERGE)

            flags |= (libvirt.VIR_MIGRATE_LIVE | libvirt.VIR_MIGRATE_NON_SHARED_DISK)

            migration_params[libvirt.VIR_MIGRATE_PARAM_MIGRATE_DISKS] = list(nonshared)

        else:

            flags |= libvirt.VIR_MIGRATE_OFFLINE

        error = self.lv_dom.migrateToURI3(dest_uri, {}, flags)

        dconn = libvirt.open(dest_uri)

        # Refresh shared pools on the destination to avoid unknown volumes:

        for pool_name in shared_pools:

            pool = dconn.storagePoolLookupByName(pool_name)

            pool.refresh()

        # Note that we don't reuse the existing connection to target

        # because the migrate3 API doesn't support P2P migrations.

        error = self.lv_dom.migrateToURI3(dest_uri, migration_params, flags)

        if error:

            raise RuntimeError('Unable to migrate VM')