#!/usr/bin/env ruby

require 'optparse'

# Default to a five minute timeout
timeout = 5
unit = ?M

OptionParser.new do |opts|
  opts.banner = "Usage: #{__FILE__} [options]"

  opts.on("-tTIMEOUT", "--t=TIMEOUT",
          "Default timeout: #{timeout}") { |t| timeout = t.to_i }
  opts.on("-uUNIT", "--u=UNIT",
         "Default unit: #{unit}") { |u| unit = u }
end.parse!

def with_mount(image)
  out = `hdiutil mount "#{image}"`
  mountpoint = out.split(/\s+/).last
  yield mountpoint
ensure
  puts `hdiutil unmount "#{mountpoint}"`
end

keyz = File.expand_path("../keyz.sparsebundle", __FILE__)
with_mount(keyz) do |mountpoint|
  `ssh-add -t #{timeout}#{unit} "#{File.join(mountpoint, "id_rsa")}"`
end