func updatePlacement(flags *pflag.FlagSet, placement *swarm.Placement) {
field, _ := flags.GetStringSlice(flagConstraintAdd)
placement.Constraints = append(placement.Constraints, field...)
toRemove := buildToRemoveSet(flags, flagConstraintRemove)
placement.Constraints = removeItems(placement.Constraints, toRemove, itemKey)
}
func placementFromGRPC(p *swarmapi.Placement) *types.Placement {
var r *types.Placement
if p != nil {
r = &types.Placement{}
r.Constraints = p.Constraints
}
return r
}