How to: Migrate to the new Fog storage provider

Old s3 example:

CarrierWave.configure do |config|
  config.s3_access_key_id = 'xxx'
  config.s3_secret_access_key = 'yyy'
  config.s3_bucket = 'name_of_bucket'
  config.s3_access_policy = :public_read
  config.s3_headers = {'Cache-Control' => 'max-age=315576000'}
  config.s3_region = 'us-east-1'
  config.s3_cnamed = true
end

class AvatarUploader < CarrierWave::Uploader::Base
  storage :s3
end

New fog s3 example:

CarrierWave.configure do |config|
  config.fog_credentials = {
    :provider               => 'AWS',
    :aws_access_key_id      => 'xxx',
    :aws_secret_access_key  => 'yyy',
    :region                 => 'us-east-1'
  }
  config.fog_directory  = 'name_of_bucket'
  config.fog_host       = 'https://assets.example.com'
  config.fog_public     = true
  config.fog_attributes = {'Cache-Control' => 'max-age=315576000'}
end

class AvatarUploader < CarrierWave::Uploader::Base
  storage :fog
end

Old cloudfiles example:

CarrierWave.configure do |config|
  config.cloud_files_username = 'xxx'
  config.cloud_files_api_key = 'yyy'
  config.cloud_files_container = 'name_of_container'
  config.cloud_files_cdn_host = "c000000.cdn.rackspacecloud.com"
end

class AvatarUploader < CarrierWave::Uploader::Base
  storage :cloudfiles
end

New fog cloudfiles example:

CarrierWave.configure do |config|
  config.fog_credentials = {
    :provider           => 'Rackspace',
    :rackspace_username => 'xxxxxxxxx',
    :rackspace_api_key  => 'yyyyyyyyy'
  }
  config.fog_directory = 'name_of_container'
  config.fog_host = "c000000.cdn.rackspacecloud.com"
end

class AvatarUploader < CarrierWave::Uploader::Base
  storage :fog
end