S3 buckets migration to another account.

Gemfile

source :rubygems

gem 'aws-sdk'
gem 'exceptional'

group :development do
  gem 'heroku'
  gem 'debugger'
end

migration.rb

require 'aws-sdk'
require 'json'

from_config = AWS.config.with(
  access_key_id: ENV['from_access_key'], 
  secret_access_key: ENV['from_secret_acccess_key']
)

to_config = AWS.config.with(
  access_key_id: ENV['to_access_key'],
  secret_access_key: ENV['to_secret_acccess_key']
)

from_account = AWS::S3.new(config: from_config)
to_account   = AWS::S3.new(config: to_config)

list = JSON.parse(ENV['list']) # "{from_bucket: new_bucket, from_bucket2: new_bucket2}"

list.each do |from, to|
  from_bucket = from_account.buckets[from]
  to_bucket   = to_account.buckets[to]

  begin
    from_bucket.objects.each do |o|
      o.copy_to(to_bucket.objects[o.key])
    end
  rescue Exception => ex
    puts ex.message
  end
end

Procfile

worker: bundle exec ruby migration.rb