namakefs.rb

# filetype=ruby fileencoding=utf8

framework 'MacFUSE'

class NamakeFS
  STRING = '寒いので冬眠したい'
  PATH   = '/honne.txt'

  def contentsOfDirectoryAtPath(path, error:error)
    return [ PATH.lastPathComponent ]
  end

  def contentsAtPath(path)
    if path == PATH
      STRING.dataUsingEncoding(NSUTF8StringEncoding)
    end
  end
end

filesystem = GMUserFileSystem.alloc.initWithDelegate(NamakeFS.new, isThreadSafe:false)
filesystem.mountAtPath('/Volumes/NamakeFS', withOptions:['rdonly', 'volname=NamakeFS'])

NSRunLoop.currentRunLoop.run