Allow filtering by namespace

[gozer]

A --namespace option could be useful for testing and targeted migrations

@DavidFluck, sounds fun ?

[laverya]

Makes sense to me!

And pretty easy to do, too - you could probably just drop it in

pvmigrate/pkg/migrate/migrate.go

Lines 402 to 413 in 09fba6b

	for _, pv := range matchingPVs {
	if pv.Spec.ClaimRef != nil {
	pvc, err := clientset.CoreV1().PersistentVolumeClaims(pv.Spec.ClaimRef.Namespace).Get(ctx, pv.Spec.ClaimRef.Name, metav1.GetOptions{})
	if err != nil {
	return nil, nil, fmt.Errorf("failed to get PVC for PV %s in %s: %w", pv.Spec.ClaimRef.Name, pv.Spec.ClaimRef.Namespace, err)
	}
	matchingPVCs[pv.Spec.ClaimRef.Namespace] = append(matchingPVCs[pv.Spec.ClaimRef.Namespace], *pvc)
	namespaces = append(namespaces, pv.Spec.ClaimRef.Namespace)
	} else {
	return nil, nil, fmt.Errorf("PV %s does not have an associated PVC - resolve this before rerunning", pv.Name)
	}
	}