command.rb

require 'marz/rsync/logs'
require 'marz/rsync/result'

module Marz
  module Rsync
    #The rsync command to be run
    class Command
      # Runs an rsync job, returns the exit code, and does logging
      #
      # @param opts {Array}
      # @return {ExitCode}
      def self.run(*opts)
        cmd = ['rsync', '--itemize-changes', 'stats -h', opts].flatten.shelljoin
        output = `#{cmd} 2>&1`
        Result.new(output, $?.exitstatus)
      end

      def self.command
        @command ||= "rsync"
      end

      def self.command=(cmd)
        @command = cmd
      end

    end
  end
end

rsync.rb

require 'marz/rsync/version'
require 'marz/rsync/configure'
require 'marz/rsync/command'


module Marz
  # Main interface to rsyunc
  module Rsync
    extend Configure
    # Runs an rsync {Command} and return the {Result}
    # @param source {String}
    # @param destination {String}
    # @param opts {Array}
    # @return {Result}
    # @yield {Result}
    def self.run(source, destination, opts = [], &block)
      destination = "#{self.host}:#{destination}" if self.host
      result = Command.run(source, destination, opts)
      yield(result) if block_given?
      result
    end
  end
end

rsync_test.rb

require "test_helper"

class Marz::RsyncTest < Minitest::Test
  def test_that_it_has_a_version_number
    refute_nil ::Marz::Rsync::VERSION
  end

  def configure_rsync_host
    Marz::Rsync.configure do |config|
      config.host = 'root@127.0.0.1'
    end
  end

  #def test_it_does_something_useful
  #  assert false
  #end

  def test_rsync_run_should_prepend_host_to_destination
    mock = MiniTest::Mock.new
    mocked_result = Minitest::Mock.new
    mock.expect(Marz::Rsync::Command::run, mocked_result, ['/foo1', 'root@127.0.0.1:/foo2', ['-a']])
    Marz::Rsync::Command.stub :run, mocked_result do
      Marz::Rsync.run('/foo1', '/foo2', ['-a'])
    end
    mock.verify
  end
end