amazon-s3-upload.rb

#!/usr/bin/env ruby
require file.dirname(__FILE__) + /../config/environment'

require 'aws/s3'
require 'progressbar'

#set up S3 config connect
config = YAML.load(File.open(File.join(RAILS_ROOT, 'config/amazon_s3.yml')))[RAILS_ENV]
bucket = config['bucket_name']
AWS::S3::Base.establish_connection!(
  :access_key_id         => config['access_key_id'],
  :secret_access_key_id  => config['secret_access_key_id']
)

files = Dir.glob(File.join(RAILS_ROOT, 'public/**/*/**/*.{css,js,gif,jpg,png}'))

#set up progress bar
progressbar = ProgressBar.new('Uploading...', files.size)

files.each do |file|
  unless File.directory?(file)

  #create an object key from the file name and revision
  key = file.gsub(/.*public\//, "#{REVISION}/")

  #upload to S3
  #TODO set the right headers for gzipped objects
  AWS::S3::S3Object.store(
    key, open(file), bucket,
    :access => :public_read, :expires => 1.year.from_now
  )

  #increment progressbar
  progressbar.inc

end