gistfile1.rb

require 'logger'

class RakeExcecuter < Logger::Application
  def initialize(tasklist = [])
    super
    @tasklist = tasklist
  end

  private
  def run
    @tasklist.each do |task|
      log(Logger::DEBUG, "#{task} start")
      # Rake::Task[task].invoke
      p task
      log(Logger::DEBUG, "#{task} end")
    end
  end
end

RakeExcecuter.new(%w(db:migrate db:seed)).start

% ruby sample.rb
I, [2014-05-14T09:54:58.024921 #26901] INFO -- ["db:migrate", "db:seed"]: Start of ["db:migrate", "db:seed"].
D, [2014-05-14T09:54:58.024996 #26901] DEBUG -- ["db:migrate", "db:seed"]: db:migrate start
"db:migrate"
D, [2014-05-14T09:54:58.025031 #26901] DEBUG -- ["db:migrate", "db:seed"]: db:migrate end
D, [2014-05-14T09:54:58.025068 #26901] DEBUG -- ["db:migrate", "db:seed"]: db:seed start
"db:seed"
D, [2014-05-14T09:54:58.025094 #26901] DEBUG -- ["db:migrate", "db:seed"]: db:seed end
I, [2014-05-14T09:54:58.025119 #26901] INFO -- ["db:migrate", "db:seed"]: End of ["db:migrate", "db:seed"]. (status: ["db:migrate", "db:seed"])