diffcp

#!/Users/local/bin/ruby
# coding: utf-8
require 'fileutils'

$user = 'user'
$pwd = 'pwd'
$server = 'nas-hostname'

module MusicBackup
  def self.to_path(d, f)
    d + File::SEPARATOR + f
  end

  def self.cmpfile(src, dst)
    s = File::Stat.new(src)
    d = File::Stat.new(dst)
    return s.mtime == d.mtime && s.size == d.size
  end

  def self.recp(src, dst)
    puts "start #{src}" if $DEBUG
    org = Dir.pwd
    Dir.chdir(src)
    as = Dir.foreach(src).to_a.sort
    ad = Dir.foreach(dst).to_a.sort
    add = as - ad
    del = ad - as
    dup = as - add
    dup.each do |x|
      next if x[0] == '.'
      if FileTest.directory?(x)
        unless FileTest.directory?(to_path(dst, x))
          FileUtils.rm_f to_path(dst, x)
          FileUtils.mkdir to_path(dst, x)
        end
        recp(to_path(src, x), to_path(dst, x))
      elsif !cmpfile(x, to_path(dst, x))
        if FileTest.directory?(to_path(dst, x))
          FileUtils.rm_rf to_path(dst,x)
        end
        FileUtils.cp(x, dst, :preserve => true)
      end
    end
    add.each do |x|
      next if x[0] == '.'
      FileUtils.cp_r(x, dst, :preserve => true)
    end
    del.each do |x|
      next if x[0] == '.'
      FileUtils.rm_rf to_path(dst, x)
    end
    Dir.chdir(org)
  end
end

unless File.exist?('/Volumes/tmp')
  FileUtils.mkdir '/Volumes/tmp'
  system("mount_afp afp://#{$user}:#{$pwd}@#{$server}/media /Volumes/tmp")
end

src = "/Users/#{$user}/Music/iTunes"
dst = '/Volumes/tmp/Music/iTunes'

MusicBackup.recp(src, dst)

system('umount /Volumes/tmp/')