MacFUSE fs in MacRuby, with custom volume icon

gistfile1.rb

framework 'cocoa'

class HelloFS
  PATH = '/hello.txt'

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

  def contentsAtPath(path)
    return nil unless path == PATH
    "Hello World!\n".dataUsingEncoding(NSUTF8StringEncoding)
  end
end

mountpoint = File.expand_path(ARGV.first || "/Volumes/Hello")
icon = File.expand_path("~/Desktop/fsicon.icns")

d = HelloFS.new

framework 'macfuse'
fs = GMUserFileSystem.alloc.initWithDelegate(d, isThreadSafe: true)
puts "GMUserFileSystem initialized"
fs.mountAtPath(mountpoint, withOptions: [
  'rdonly', 'volname=HelloFS', "volicon=#{icon}"
])

at_exit { fs.unmount }