code: def install(opts):
      
      resources = _load(opts.resources, opts.output_dir)
      if opts.all:
          opts.resource_names = ALL
      success = _install(resources, opts.resource_names, opts.mirror_url,
                         opts.destination, opts.skip_top_level)
      if success:
          if not opts.quiet:
              print("All resources successfully installed")
          return 0
      else:
          if not opts.quiet:
              invalid = _invalid(resources, opts.resource_names)
              print("Unable to install some resources: {}".format(', '.join(invalid)))
          return 1
docs: Install one or more resources.