Sync directory to Amazon S3

s3-sync.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'fog'
require 'digest/md5'

local_directory  = 'bootstrap'
remote_directory = 'bootstrap'
bucket_name      = 'mybucket'
provider         = 'AWS'
region           = 'eu-west-1'
key_id           = 'mykey'
key_secret       = 'mysecret'

src_dir = File.join(File.expand_path(File.dirname(__FILE__)), local_directory)

local_files = Dir.entries(src_dir).select do |filename|
    filename unless filename == '.' or filename == '..'
end

connection = Fog::Storage.new({
    :provider              => provider,
    :aws_access_key_id     => key_id,
    :aws_secret_access_key => key_secret,
    :region                => region
})

bucket = connection.directories.get(bucket_name)

local_files.each do |filename|
    remote_filename = File.join remote_directory, filename
    local_filename  = File.join src_dir, filename
    file = bucket.files.get(remote_filename)
    if file.nil?
        puts "Creating new remote file #{remote_filename}"
        bucket.files.create(
            :key    => remote_filename,
            :body   => File.open(local_filename),
            :public => true
        )
    else
        local_md5 = Digest::MD5.hexdigest(File.read(local_filename))
        unless local_md5 == file.etag
            puts "Saving changed file #{remote_filename}"
            file.body = File.open(local_filename)
            file.acl = 'public-read'
            file.save
        end
    end
end