func (cmd *UpdateBuildpack) Requirements(requirementsFactory requirements.Factory, fc flags.FlagContext) ([]requirements.Requirement, error) {
if len(fc.Args()) != 1 {
cmd.ui.Failed(T("Incorrect Usage. Requires an argument\n\n") + commandregistry.Commands.CommandUsage("update-buildpack"))
return nil, fmt.Errorf("Incorrect usage: %d arguments of %d required", len(fc.Args()), 1)
}
loginReq := requirementsFactory.NewLoginRequirement()
cmd.buildpackReq = requirementsFactory.NewBuildpackRequirement(fc.Args()[0])
reqs := []requirements.Requirement{
loginReq,
cmd.buildpackReq,
}
return reqs, nil
}