file used to archive and restore code to/from cloud

migrate.rb

#!/usr/bin/env ruby
require "rubygems" # ruby1.9 doesn't "require" it though
require "facets/string/unindent"
require "thor"

class Migrate < Thor
  class Logger
    def initialize(color, console)
      @color = color
      @console = console
    end

    def log(message)
      @console.say message.unindent, @color
    end
    alias_method :<<, :log
  end

  attr_reader :green, :red, :cyan
  def initialize(*args)
    super(*args)
    @green = Logger.new :green, self
    @red   = Logger.new :red, self
    @cyan = Logger.new :cyan, self
  end

  desc "pack", "archive Project sources to cloud"
  def pack
    project_links.each do |link|
      archive = File.dirname(link.path) << "/" << File.basename(link.target) << ".tar.gz"

      if File.exist?(archive) and not changed?(link.target, archive)
        cyan.log "Skipped #{link.target}"
        next
      end

      green.log <<-LOG
        -----------------
        Packing
        -----------------
        #{link.target}
        to
        #{archive}
      LOG
      File.delete archive rescue nil
      `tar czf "#{archive}" -C "#{link.target}" "."`
    end
    say 'done'
  end

  desc "unpack", "restore sources from cloud"
  method_option :force, :aliases => "-f", :desc => "Overwrite files even they where changed after archive was created"
  def unpack
    project_links.each do |link|
      file_name = File.basename(link.target)
      timestamp = File.dirname(link.target) << "/" << ".#{file_name}.timestamp"
      archive   = File.dirname(link.path)   << "/" << file_name << ".tar.gz"

      unless File.exist?(archive)
        red.log "Archive '#{archive}' does not exists"
        next
      end

      if options[:force].nil? and changed?(link.target, archive)
        red.log "Files at '#{link.target}' has been modified after archive was created!"
        `find "#{link.target}" -newer "#{archive}"`.split.each do |file|
          red.log file
        end
        red.log "Resolve conflicts and rerun with '-f' option\n"

        next
      end

      if File.exist?(timestamp) and File.mtime(timestamp) > File.mtime(archive)
        cyan.log "Skipped '#{link.target}'"
        next
      end

      green.log <<-LOG
        -----------------
        Extracting
        -----------------
        #{archive}
        to
        #{link.target}
      LOG

      `rm -rf "#{link.target}"`
      `mkdir -p "#{link.target}"`
      `tar xfz "#{archive}" -C "#{link.target}"`
      `touch "#{timestamp}"`
    end
    say 'done'
  end

  private
  def project_links
    link_struct = Struct.new(:path, :target)
    `find ./Projects -type l`.split("\n").map do |link|
      link_struct.new(File.absolute_path(link), `readlink "#{link}"`.strip)
    end
  end

  def changed?(dir, archive)
    not `find "#{dir}" -newer "#{archive}" | wc -l`.to_i == 0
  end
end

Migrate.start