code: def attach(gandi, disk, vm, position, read_only, background, force):
      
      if not force:
          proceed = click.confirm("Are you sure you want to attach disk '%s'"
                                  " to vm '%s'?" % (disk, vm))
          if not proceed:
              return
  
      disk_info = gandi.disk.info(disk)
      attached = disk_info.get('vms_id', False)
      if attached and not force:
          gandi.echo('This disk is still attached')
          proceed = click.confirm('Are you sure you want to detach %s?' % disk)
  
          if not proceed:
              return
  
      result = gandi.disk.attach(disk, vm, background, position, read_only)
      if background and result:
          gandi.pretty_echo(result)
  
      return result
docs: Attach disk to vm.
  
      disk can be a disk name, or ID
      vm can be a vm name, or ID