brew/Library/Homebrew/cask/artifact/binary.rb

require "cask/artifact/symlinked"

module Cask
  module Artifact
    class Binary < Symlinked
      def link(command: nil, **options)
        super(command: command, **options)
        return if source.executable?

        if source.writable?
          FileUtils.chmod "+x", source
        else
          command.run!("/bin/chmod", args: ["+x", source], sudo: true)
        end
      end
    end
  end
end